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• Analysis of gene expression during odontogenic differentiation of cultured human dental pulp cells
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• Development and performance test of a micro bubble irrigation system for root canal cleaning of tooth
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• Comparison of the shaping abilities of three nickel–titanium instrumentation systems using micro-computed tomography
  Jin Yi Baek, Hyun Mi Yoo, Dong Sung Park, Tae Seok Oh, Kee Yeon Kum, Seung Yun Shin, Seok Woo Chang
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Numerous cases about additional growth of roots or pulp tissue regeneration by using various intracanal medicaments in immature permanent teeth with periapical or pulpal disease have been reported. The underlying mechanism has not been clearly delineated, but it has been widely accepted that undifferentiated mesenchymal cells and stem cells are involved. Moreover, the growth and deposition of osteoid or cementoid tissues have been observed in regenerated pulp and roots. This new and non-invasive treatment has brightened the future of endodontics, and enlarged the vision of regenerative root canal treatment with multi-potent stem cells and various tissue engineering techniques.

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• Platelet rich fibrin - a novel acumen into regenerative endodontic therapy
  Kavita Hotwani, Krishna Sharma
  Restorative Dentistry & Endodontics.2014; 39(1): 1.     CrossRef

This study investigated the changes in gene expression when mineral trioxide aggregate (MTA) was applied in vitro to human dental pulp cells (HDPCs). MTA in a teflon tube (diameter 10 mm, height 2 mm) was applied to HDPCs. Empty tube-applied HDPCs were used as negative control. For microarray analysis, total RNA was extracted at 6, 24, and 72 hrs after MTA application. The results were confirmed selectively by performing reverse transcriptase polymerase chain reaction for genes that showed changes of more than two-fold or less than half. Of the 24,546 genes, 109 genes were up-regulated greater than two-fold (e.g., FOSB, THBS1, BHLHB2, EDN1, IL11, FN1, COL10A1, and TUFT1) and 69 genes were down-regulated below 50% (e.g., SMAD6 and DCN). These results suggest that MTA, rather than being a bio-inert material, may have potential to affect the proliferation and differentiation of pulp cells in various ways.

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• Analysis of gene expression during odontogenic differentiation of cultured human dental pulp cells
  Min-Seock Seo, Kyung-Gyun Hwang, Hyongbum Kim, Seung-Ho Baek
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• Comparison of gene expression profiles of human dental pulp cells treated with mineral trioxide aggregate and calcium hydroxide
  Yong-Beom Kim, Won-Jun Shon, Woocheol Lee, Kee-Yeon Kum, Seung-Ho Baek, Kwang-Shik Bae
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The purpose of this study was to compare mineral trioxide aggregate (MTA; Dentsply, Tulsa Dental, Tulsa, OK, USA), which is widely used as root-end filling material, with DiaRoot BioAggregate (DB; Innovative BioCaramix Inc, Vancouver, BC, Canada), newly developed product, by using MG63 osteoblast-like cells. MTA, DB, and Intermediate Restorative Material (IRM; Dentsply Caulk, Milford, DE, USA) were used for root-end filling material while tissue culture plastic was used for control group. Each material was mixed and, the mixtures were left to set for 24 hours. MG63 cells were seeded to each group and then they were cultured for attachment for 4 hours. Following the attachment of cells to the root-end filling material, early cellular response was observed. After another 12 hours'culture, the level of attachment between cells and material was observed and in order to identify the effect of each material to bone formation, transforming growth factor beta1 (TGFβ1) and osteocalin (OC) were estimated by using enzyme-linked immunosorbent assay (ELISA), and the amount of alkaline phosphatase (ALP) was also measured. The data were analyzed using one-way ANOVA. As a result, only at OC and the number of cells which were attached to materials, there was no statistical difference between MTA and DB. At other items, there was statistically significant difference in all groups. Although DB has not shown exactly the same cellular response like that of MTA, the number of attached cells shows that biocompatibility of the material and OC indicates bone formation rate. Therefore, if DB is used for root end filling material, it is expected to lead to similar results to MTA.

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• Comparative analysis of physicochemical properties of root perforation sealer materials
  Maura Cristiane Gonçales Orçati Dorileo, Fábio Luis Miranda Pedro, Matheus Coelho Bandeca, Orlando Aguirre Guedes, Ricardo Dalla Villa, Alvaro Henrique Borges
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The purpose of this study was to find out the relationship of radiographic lesion size, gender, age of patients and radiographic character to the diagnosis of periapical cyst and granuloma.

The data was collected from 187 periapical lesions of 167 patients who undergone apical surgery at Department of Conservative Dentistry, Seoul National University Dental Hospital from 2003 to 2005. The lesion were surgically removed and send for biopsy to the Oral Pathology Laboratory. From the initial radiograph, lesion size was calculated using PiViewSTAR® (INFINITT, Korea) program. The obtained data were statistically evaluated using SPSS (p < 0.05).

The result were as followings:

From 187 biopsy samples, the incidence of periapical cyst was 28.34% and granuloma was 65.24%.

This study evaluated the influence of the type of restoration and the amount of interdental spacing on the stress distribution in maxillary central incisors restored by means of porcelain laminate veneers and direct composite resin restorations.

Three-dimensional finite element models were fabricated to represent different types of restorations. Four clinical situations were considered. Type I, closing diastema using composite resin. Labial border of composite resin was extended just enough to cover the interdental space; Type II, closing diastema using composite resin without reduction of labial surface. Labial border of composite resin was extended distally to cover the half of the total labial surface; Type III, closing diastema using composite resin with reduction of labial surface. Labial border of the preparation and restored composite resin was extended distally two-thirds of the total labial surface; Type IV, closing diastema using porcelain laminate veneer with a feathered-edge preparation technique. Four different interdental spaces (1.0, 2.0, 3.0, 4.0 mm) were applied for each type of restorations.

For all types of restoration, adding the width of free extension of the porcelain laminate veneer and composite resin increased the stress occurred at the bonding layer. The maximum stress values observed at the bonding layer of Type IV were higher than that of Type I, II and III. However, the increasing rate of maximum stress value of Type IV was lower than that of Type I, II and III.

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• Revamping the Peg Smile: An Art of Rehabilitation of Peg Laterals with Ceramic Veneers and Composite Restorations—A Case Report
  Mahendran Kavitha, Ramdhas Annapurani, Pasupathy Shakunthala, Jayavel Nandhakumar
  Journal of Operative Dentistry & Endodontics.2022; 6(2): 69.     CrossRef
• Minimally Invasive Diastema Restoration with Prefabricated Sectional Veneers
  Claudio Novelli, Andrea Scribante
  Dentistry Journal.2020; 8(2): 60.     CrossRef

The aim of this study was to measure the dentinal tubular fluid flow (DFF) during and after amalgam and composite restorations. A newly designed fluid flow measurement instrument was made. A third molar cut at 3 mm apical from the CEJ was connected to the flow measuring device under a hydrostatic pressure of 15 cmH₂O. Class I cavity was prepared and restored with either amalgam (Copalite varnish and Bestaloy) or composite (Z-250 with ScotchBond MultiPurpose: MP, Single Bond 2: SB, Clearfil SE Bond: CE and Easy Bond: EB as bonding systems). The DFF was measured from the intact tooth state through restoration procedures to 30 minutes after restoration, and re-measured at 3 and 7days after restoration.

Inward fluid flow (IF) during cavity preparation was followed by outward flow (OF) after preparation. In amalgam restoration, the OF changed to IF during amalgam filling and slight OF followed after finishing.

In composite restoration, application CE and EB showed a continuous OF and air-dry increased rapidly the OF until light-curing, whereas in MP and SB, rinse and dry caused IF and OF, respectively. Application of hydrophobic bonding resin in MP and CE caused a decrease in flow rate or even slight IF. Light-curing of adhesive and composite showed an abrupt IF. There was no statistically significant difference in the reduction of DFF among the materials at 30 min, 3 and 7 days after restoration (P > 0.05).

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• Real-time measurement of dentinal fluid flow during desensitizing agent application
  Sun-Young Kim, Eun-Joo Kim, In-Bog Lee
  Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 313.     CrossRef

The purpose of this study was to investigate the effect of rigidity of post core systems on stress distribution by the theoretical technique, finite element stress-analysis method. Three-dimensional finite element models simulating an endodontically treated maxillary central incisor restored with a zirconia ceramic crown were prepared and 1.5 mm ferrule height was provided. Each model contained cortical bone, trabecular bone, periodontal ligament, 4 mm apical root canal filling, and post-and-core. Six combinations of three parallel type post (zirconia ceramic, glass fiber, and stainless steel) and two core (Paracore and Tetric ceram) materials were evaluated, respectively. A 50 N static occlusal load was applied to the palatal surface of the crown with a 60° angle to the long axis of the tooth. The differences in stress transfer characteristics of the models were analyzed. von Mises stresses were chosen for presentation of results and maximum displacement and hydrostatic pressure were also calculated. An increase of the elastic modulus of the post material increased the stress, but shifted the maximum stress location from the dentin surface to the post material. Buccal side of cervical region (junction of core and crown) of the glass fiber post restored tooth was subjected to the highest stress concentration. Maximum von Mises stress in the remaining radicular tooth structure for low elastic modulus resin core (29.21 MPa) was slightly higher than that for high elastic modulus resin core (29.14 MPa) in case of glass fiber post. Maximum displacement of glass fiber post restored tooth was higher than that of zirconia ceramic or stainless steel post restored tooth.

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• Evaluation of stress distribution on an endodontically treated maxillary central tooth with lesion restored with different crown materials: A finite element analysis
  Ömer Kirmali, Gülsah Icen, H. Kursat Celik, Allan E.W. Rennie
  Heliyon.2024; 10(3): e25829.     CrossRef
• The mechanical and physical properties of microcrystalline cellulose (MCC)/sisal/PMMA hybrid composites for dental applications
  Harini Sosiati, Arif Muhammad Rizky, Aldi Lukman Maulana Latief, Rahmad Kuncoro Adi, Sinin Hamdan
  Materials Research Express.2023; 10(3): 035301.     CrossRef
• Influence of post types and sizes on fracture resistance in the immature tooth model
  Jong-Hyun Kim, Sung-Ho Park, Jeong-Won Park, Il-Young Jung
  Journal of Korean Academy of Conservative Dentistry.2010; 35(4): 257.     CrossRef

The aim of this in vitro study was to evaluate the cleaning efficacy of various irrigation methods in the mandibular mesial roots. The forty five mesial root canals were shaped by Profile .06 instruments to apical size #30 and irrigated with 5 ml of 3.5% NaOCl. The teeth were divided into 3 groups and irrigated finally for 1 minute; Group 1: syringe irrigation, Group 2: ultrasonic irrigation, Group 3: RinsEndo irrigation.

After histological processing, the cross sections of apical 1, 3, and 5 mm level were examined with an optical microscope. The cleanliness values of canals and isthmuses were calculated and analyzed by Mann-Whitney U test.

There were no significant differences in both canal and isthmus cleanliness between syringe irrigation and ultrasonic irrigation except 5 mm level of isthmus.

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• Multivariate analysis of the cleaning efficacy of different final irrigation techniques in the canal and isthmus of mandibular posterior teeth
  Yeon-Jee Yoo, WooCheol Lee, Hyeon-Cheol Kim, Won-Jun Shon, Seung-Ho Baek
  Restorative Dentistry & Endodontics.2013; 38(3): 154.     CrossRef
• Review of root canal irrigant delivery techniques and devices
  Yeon-Jee Yoo, Su-Jeong Shin, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2011; 36(3): 180.     CrossRef

This clinical study evaluated the whitening effect and safety of polymer based-pen type BlancTis Forte (NIBEC) containing 8.3% carbamide peroxide. Twenty volunteers used the BlancTis Forte whitening agent for 2 hours twice a day for 4 weeks. As a control, Whitening Effect Pen (LG) containing 3% hydrogen peroxide was used by 20 volunteers using the same protocol. The change in shade (ΔE^*, color difference) was measured using Shadepilot™ (DeguDent) before, during, and after bleaching (2 weeks, 4 weeks, and post-bleaching 4 weeks). A clinical examination for any side effects (tooth hypersensitivity or soft tissue complications) was also performed at each check-up. The following results were obtained.

1. Both the experimental and control groups displayed a noticeable change in shade (ΔE) of over 2. No significant differences were found between the two groups (p > 0.05), implying that the two agents have a similar whitening effect.

2. The whitening effect was mainly due to changes in a and b values rather than in L value (brightness). The experimental group showed a significantly higher change in b value, thus yellow shade, than the control (p < 0.05).

3. None of the participants complained of tooth hypersensitivity or soft tissue complications, confirming the safety of both whitening agents.

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• Surface Damage and Bleaching Effect according to the Application Type of Home Tooth Bleaching Applicants
  Na-Yeoun Tak, Do-Seon Lim, Hee-Jung Lim, Im-Hee Jung
  Journal of Dental Hygiene Science.2020; 20(4): 252.     CrossRef
• Efficacy of a self - applied paint - on whitening gel combined with wrap
  Soo-Yeon Kim, Jae-Hyun Ahn, Ji-Young Kim, Jin-Woo Kim, Se-Hee Park, Kyung-Mo Cho
  Journal of Dental Rehabilitation and Applied Science.2018; 34(3): 175.     CrossRef

This study was aimed to investigate whether an oxygen inhibition layer (OIL) is essential for the interfacial bonding between resin composite layers or not.

A composite (Z-250, 3M ESPE) was filled in two layers using two aluminum plate molds with a hole of 3.7 mm diameter. The surface of first layer of cured composite was prepared by one of five methods as followings, thereafter second layer of composite was filled and cured: Group 1 - OIL is allowed to remain on the surface of cured composite; Group 2 - OIL was removed by rubbing with acetone-soaked cotton; Group 3 - formation of the OIL was inhibited using a Mylar strip; Group 4 - OIL was covered with glycerin and light-cured; Group 5 (control) - composite was bulk-filled in a layer. The interfacial shear bond strength between two layers was tested and the fracture modes were observed. To investigate the propagation of polymerization reaction from active area having a photo-initiator to inactive area without the initiator, a flowable composite (Aelite Flow) or an adhesive resin (Adhesive of ScotchBond Multipurpose) was placed over an experimental composite (Exp_Com) which does not include a photoinitiator and light-cured. After sectioning the specimen, the cured thickness of the Exp_Com was measured.

The bond strength of group 2, 3 and 4 did not show statistically significant difference with group 1. Groups 3 and 4 were not statistically significant different with control group 5. The cured thicknesses of Exp_Com under the flowable resin and adhesive resin were 20.95 (0.90) um and 42.13 (2.09), respectively.

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• Finishing and Polishing of Composite Restoration: Assessment of Knowledge, Attitude and Practice Among Various Dental Professionals in India
  Sankar Vishwanath, Sadasiva Kadandale, Senthil kumar Kumarappan, Anupama Ramachandran, Manu Unnikrishnan, Honap manjiri Nagesh
  Cureus.2022;[Epub]     CrossRef
• Evaluation of Surface Roughness of Composite, Compomer and Carbomer After Curing Through Mylar Strip and Glycerin: A Comparative Study
  Asli Topaloglu-Ak, Dilara Çayırgan, Melisa Uslu
  Journal of Advanced Oral Research.2020; 11(1): 12.     CrossRef
• Effect of glycerin on the surface hardness of composites after curing
  Hyun-Hee Park, In-Bog Lee
  Journal of Korean Academy of Conservative Dentistry.2011; 36(6): 483.     CrossRef

Mineral trioxide aggregate (MTA) would influence healing of periapical tissues by modulating the production of growth factors and cytokines from PDL fibroblasts, however, the studies are insufficient. Therefore, the purpose of this study was to monitor the expression of transforming growth factor-beta1 (TGF-β1), fibroblast growth factor-2 (FGF-2), and interleukin-6 (IL-6) from PDL fibroblasts in the presence of MTA. The human PDL fibroblasts were seeded onto the set MTA or IRM at a level of 1 × 10⁵ cells per unit well, and further incubated for 6, 12, 24, and 48 hours. The levels of TGF-β1, FGF-2, and IL-6 from the supernatant were measured by enzyme-linked immunosorbent assay (ELISA). The data were analyzed using one-way ANOVA. The level of TGF-β1 was down-regulated when the cells were grown in the presence of MTA except at 6 hours. The levels of FGF-2 release were significantly suppressed when PDL fibroblasts were grown in the presence of MTA or IRM at all time intervals (p < 0.05). The expressions of IL-6 from MTA treated cells were comparable to those of untreated control cells throughout the observation periods. We presume that this material inhibits the stimulatory function of growth factors on granulation tissue formation and in turn, it promotes the healing process modulated by other bone-remodeling cells.

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• Osteo/odontogenic Differentiation of Human Mesenchymal Stem Cells with Platelet-rich Plasma and Mineral Trioxide Aggregate
  Shanthi Vanka, Amit Vanka, Sandeep Kumar Vishwakarma, Manohar K Bhat, Othman Wali, Aleem A Khan
  The Journal of Contemporary Dental Practice.2019; 20(10): 1171.     CrossRef
• The effect of several root-end filling materials on MG63 osteoblast-like cells
  Jeong-Ho Lee, Won-Jun Shon, WooCheol Lee, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2010; 35(3): 222.     CrossRef
• Biocompatibility of experimental mixture of mineral trioxide aggregate and glass ionomer cement
  Min-Jae Oh, Yu-Na Jeong, In-Ho Bae, So-Young Yang, Bum-Jun Park, Jeong-Tae Koh, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
  Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 359.     CrossRef
• Biocompatibility of bioaggregate cement on human pulp and periodontal ligament (PDL) derived cells
  Choo-Ryung Chung, Euiseong Kim, Su-Jung Shin
  Journal of Korean Academy of Conservative Dentistry.2010; 35(6): 473.     CrossRef
• Effects of condensation techniques and canal sizes on the microleakage of orthograde MTA apical plug in simulated canals
  Deuk-Lim Nam, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
  Journal of Korean Academy of Conservative Dentistry.2009; 34(3): 208.     CrossRef

The purpose of this study was to evaluate the thermal expansion characteristics of injectable thermoplasticized gutta-perchas and a Resilon. The materials investigated are Obtura gutta-percha, Diadent gutta-percha, E&Q Gutta-percha Bar and Epiphany (Resilon).

The temperature at the heating chamber orifice of an Obtura II syringe and the extruded gutta-percha from the tip of both 23- and 20-gauge needle was determined using a Digital thermometer. A cylindrical ceramic mold was fabricated for thermal expansion test, which was 27 mm long, with an internal bore diameter of 3 mm and an outer diameter of 10 mm. The mold was filled with each experimental material and barrel ends were closed with two ceramic plunger. The samples in ceramic molds were heated in a dilatometer over the temperature range from 25℃ to 75℃. From the change of specimen length as a function of temperature, the coefficients of thermal expansion were determined.

There was no statistical difference between four materials in the thermal expansion in the range from 35℃ to 55℃ (p > 0.05). However, Obtura Gutta-percha showed smaller thermal expansion than Diadent and Metadent ones from 35℃ to 75℃ (p < 0.05). The thermal expansion of Epiphany was similar to those of the other gutta-percha groups.

The purpose of this study was to compare the cytotoxicity by MTT test and genotoxicity by Ames test of new calcium phosphate-based root canal sealers (CAPSEAL I, CAPSEAL II) with commercially available resin-based sealers (AH 26, AH Plus), zinc oxide eugenol-based sealers (Tubliseal EWT, Pulp Canal Sealer EWT), calcium hydroxide-based sealer (Sealapex), and tricalcium phosphate based sealers (Sankin Apatite Root Canal Sealer I, II, III).

According to this study, the results were as follows:

The extracts of freshly mixed group showed higher toxicity than those of 24 h set group in MTT assay (p < 0.001).

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• In vitrocytotoxicity of four calcium silicate-based endodontic cements on human monocytes, a colorimetric MTT assay
  Sedigheh Khedmat, Somayyeh Dehghan, Jamshid Hadjati, Farimah Masoumi, Mohammad Hossein Nekoofar, Paul Michael Howell Dummer
  Restorative Dentistry & Endodontics.2014; 39(3): 149.     CrossRef
• A comparative evaluation of cytotoxicity of root canal sealers: anin vitrostudy
  Gautam Pyarelal Badole, Manjusha Madhukar Warhadpande, Ganesh Kothiramji Meshram, Rakesh Namdeoraoji Bahadure, Shubha Gopal Tawani, Gopal Tawani, Shital Gautam Badole
  Restorative Dentistry & Endodontics.2013; 38(4): 204.     CrossRef
• Comparison of biocompatibility of four root perforation repair materials
  Min-Kyung Kang, In-Ho Bae, Jeong-Tae Koh, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
  Journal of Korean Academy of Conservative Dentistry.2009; 34(3): 192.     CrossRef

The aim of this study was to evaluate the effect of cavity shape, bond quality of bonding agent and volume of resin composite on shrinkage stress developed at the cavity floor. This was done by measuring the shear bond strength with respect to iris materials (cavity shape; adhesive-coated dentin as a high C-factor and Teflon-coated metal as a low C-factor), bonding agents (bond quality; Scotchbond™ Multi-purpose and Xeno®III) and iris hole diameters (volume; 1 mm or 3 mm in diameter × 1.5 mm in thickness). Ninety-six molars were randomly divided into 8 groups (2 × 2 × 2 experimental setup). In order to simulate a Class I cavity, shear bond strength was measured on the flat occlusal dentin surface with irises. The iris hole was filled with Z250 restorative resin composite in a bulk-filling manner. The data was analyzed using three-way ANOVA and the Tukey test. Fracture mode analysis was also done. When the cavity had high C-factor, good bond quality and large volume, the bond strength decreased significantly. The volume of resin composite restricted within the well-bonded cavity walls is also be suggested to be included in the concept of C-factor, as well as the cavity shape and bond quality. Since the bond quality and volume can exaggerate the effect of cavity shape on the shrinkage stress developed at the resin-dentin bond, resin composites must be filled in a method, which minimizes the volume that can increase the C-factor.

The properties of ideal root canal sealers include the ability of sealing the total root canal system and no toxic effects to periradicular tissues. Cytotoxicity test using cell culture is a common screening method for evaluation of the biocompatibility of root canal sealers. The purpose of this study was to investigate the cytotoxic effect of newly developed resin-based sealer (Adseal 1, 2, and 3) comparing with those commercial resin-based sealers (AH26 and AH Plus), ZOE-based sealers (Tubliseal EWT, Pulp Canal Sealer EWT) and calcium hydroxide based sealer (Sealapex). An indirect contact test of cytotoxicity by agar diffusion was performed according to the international standard ISO 10993-5. L929 fibroblast cells were incubated at 37℃ in humidified 5% CO₂-containing air atmosphere. The freshly mixed test materials were inserted into glass rings of internal diameter 5 mm and height 5 mm placed on the agar. After the 24 hrs incubation period, the decolorization zones around the test materials were assessed using an inverted microscope with a calibrated screen. A Decolorization Index was determined for each specimen. Adseal 1, 2, and 3 did not exert any cytotoxic effects, whereas AH26, AH Plus, Tubliseal EWT, Pulp Canal Sealer EWT, and Sealapex produced mild cytotoxicity.

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• Cytotoxicity Comparison of Sure-seal root and Adseal Sealers on mouse fibroblast Cells:Invitro study
  Azam haddadikohsar, Mohammad shokrzade, Marjan Fallah, Fatemeh Shakeri
  journal of research in dental sciences.2024; 21(1): 46.     CrossRef
• Antimicrobial efficacy of Kerr pulp canal sealer (EWT) in combination with 10% amoxicillin on Enterococcus faecalis: A confocal laser scanning microscopic study
  Madhureema De Sarkar, Kundabala Mala, Suchitra Shenoy Mala, Shama Prasada Kabekkodu, Srikant Natarajan, Neeta Shetty, Priyanka Madhav Kamath, Manuel Thomas
  F1000Research.2023; 12: 725.     CrossRef
• Antimicrobial efficacy of Kerr pulp canal sealer (EWT) in combination with 10% amoxicillin on Enterococcus faecalis: A confocal laser scanning microscopic study
  Madhureema De Sarkar, Kundabala Mala, Suchitra Shenoy Mala, Shama Prasada Kabekkodu, Srikant Natarajan, Neeta Shetty, Priyanka Madhav Kamath, Manuel Thomas
  F1000Research.2023; 12: 725.     CrossRef
• Cytotoxicity and Genotoxicity of Epoxy Resin-Based Root Canal Sealers before and after Setting Procedures
  Mijoo Kim, Marc Hayashi, Bo Yu, Thomas K. Lee, Reuben H. Kim, Deuk-won Jo
  Life.2022; 12(6): 847.     CrossRef
• Biocompatibility and Bioactivity of Four Different Root Canal Sealers in Osteoblastic Cell Line MC3T3-El
  Nu-Ri Jun, Sun-Kyung Lee, Sang-Im Lee
  Journal of Dental Hygiene Science.2021; 21(4): 243.     CrossRef

Immunoinhibitory protein extracted from sonicated Treponema denticola have been shown to suppress cell cycle progression of human lymphocytes. To study in detail about the effect of this microorganism on the function of lymphocytes, we investigated the levels of Interleukin-2 (IL-2) and Interleukin-4 (IL-4) production by T lymphocytes before and after the addition of 12.5 µg/ml T. denticola sonicated extracts. In this study, levels of IL-2 and IL-4 produced from T cells pretreated with sonicated extracts were evaluated by using the quantitative sandwich enzyme immunoassay technique. In response to phytohemagglutinin (PHA) stimulation, T cell produced increased levels of IL-2 and IL-4. However, the expressions of both cytokines were significantly inhibited when PHA activated-T cells were pre-exposed to sonicated T. denticola extracts (p < 0.05). These findings suggest that the T. denticola sonicated extracts induced-immunosuppression in Th1 and Th2 cell functions could be a part of the pathogenic mechanism of the endodontic failure associated with this microorganism.

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• TLR5 activation induces expression of the pro‐inflammatory mediator Urokinase Plasminogen Activator via NF‐κB and MAPK signalling pathways in human dental pulp cells
  H.‐S. Hwang, J.‐W. Kim, S.‐H. Oh, J. H. Song, J.‐W. Yang, Y. Zang, Y.‐H. Kim, S.‐E. Lee, Y.‐C. Hwang, J.‐T. Koh
  International Endodontic Journal.2019; 52(10): 1479.     CrossRef

The purpose of this study was to compare the effects of preparation with GT files and profiles .04 in shaping of root canals and reconstruct the three-dimensional root canal system using micro computed tomography.

40 canals of the extracted human mandibular molars were used, and randomly distributed into two experimental groups. In group 1, canals were prepared by GT files. In group 2, Profiles .04. were used. Apical preparation size was #30.

For each tooth pre and post operative cross-sectional images were obtained by the micro CT at 50 micron intervals. Pre and post operative cross-sectional images of 1, 2, 3, 5, and 8mm from the apex were compared. For each section, canal area and centering ratio were determined. For each tooth pre- and post-operative root canal volume from the furcation to the apex of the roots was calculated by three-dimensional image software. Following results were obtained:

1. At 8mm from the apex, area of dentin removed by GT rotary file was significantly larger than that by Profile .04. And at the other levels there was not a significant difference.

2. There was a trend for GT rotary file to remain more centered in the canals than Profile .04 at all levels. But at 3mm level, there was a statistically significant difference.

3. In root canal volume increments after instrumentation, there was no significant difference between two groups.

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• Evaluation of apical canal shapes produced sequentially during instrumentation with stainless steel hand and Ni-Ti rotary instruments using Micro-computed tomography
  Woo-Jin Lee, Jeong-Ho Lee, Kyung-A Chun, Min-Seock Seo, Yeon-Jee Yoo, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2011; 36(3): 231.     CrossRef
• Comparative study on morphology of cross-section and cyclic fatigue test with different rotary NiTi files and handling methods
  Jae-Gwan Kim, Kee-Yeon Kum, Eui-Seong Kim
  Journal of Korean Academy of Conservative Dentistry.2006; 31(2): 96.     CrossRef

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• Effect of infection control barrier thickness on light curing units
  Hoon-Sang Chang, Seok-Ryun Lee, Sung-Ok Hong, Hyun-Wook Ryu, Chang-Kyu Song, Kyung-San Min
  Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 368.     CrossRef

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• Prognostic factors influencing clinical outcome of nonsurgical endodontic treatment
  Seonah Kim
  Journal of Korean Academy of Conservative Dentistry.2010; 35(6): 436.     CrossRef

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• BIOCERAMIC-BASED ROOT CANAL SEALERS
  L Somolová, Z Zapletalová, M Rosa, B Novotná, I Voborná, Y Morozova
  Česká stomatologie a praktické zubní lékařství.2021; 121(4): 116.     CrossRef
• In vitrocytotoxicity of four calcium silicate-based endodontic cements on human monocytes, a colorimetric MTT assay
  Sedigheh Khedmat, Somayyeh Dehghan, Jamshid Hadjati, Farimah Masoumi, Mohammad Hossein Nekoofar, Paul Michael Howell Dummer
  Restorative Dentistry & Endodontics.2014; 39(3): 149.     CrossRef
• Chronic maxillary sinusitis caused by root canal overfilling of Calcipex II
  Jin-Woo Kim, Kyung-Mo Cho, Se-Hee Park, Soh-Ra Park, Sang-Shin Lee, Suk-Keun Lee
  Restorative Dentistry & Endodontics.2014; 39(1): 63.     CrossRef

The purpose of this study was to compare the histomorphological change of curved root canal preparation using GT rotary File, Profile .04 taper and stainless steel K-file. 45 mesial canals(over 20 degree) of extracted human mandibular first molars were mounted in resin using a modified Bramante muffle system and divided into three groups. The roots were cross-sectioned at 2.5mm, 5mm and 8mm levels from apical foramen. Tracings of the canals were made from preinstrumentation pictures of the cross section. The canals were prepared using a step-back technique with stainless steel K file(group 1), Profile .04 taper rotary file(group 2) and GT rotary file(group 3). Tracings of the prepared canals were made from postinstrumentation picture. Canal centring ratio, amount of transportation, area of dentin removed and shape of canal were measured and statistically were evaluated with Student-Newman-Keuls test using Sigma Stat(Jandel Scientific Software, USA).

The results were as followings:

1. Amount of transportation of group 2 was the lowest at apical part, but there was no statistical difference. The direction of transportation was the outside of curvature at apical part.

2. Centering ratio at the apical part of group 1 was the highest, and there was statistical differences between apical and middle part, apical and coronal part(p<0.05). Centering ratio at the middle part of group 3 was the lowest, and there was statistical difference between apical and middle part(p<0.05). Centring ratio of group 2 was the lowest at apical part, but there was no statistical difference.

3. Amount of dentin removed of group 1 was the highest at coronal, middle and apical part among three groups, and there was statistical difference(p<0.05).

4. The majority of the cross-sectioned canal shape after instrumentation were irregular at coronal, middle and apical part. But there are more number of round shaped canals at group 3 than other group.

Citations

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• Evaluation of apical canal shapes produced sequentially during instrumentation with stainless steel hand and Ni-Ti rotary instruments using Micro-computed tomography
  Woo-Jin Lee, Jeong-Ho Lee, Kyung-A Chun, Min-Seock Seo, Yeon-Jee Yoo, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2011; 36(3): 231.     CrossRef
• A study on transportation of apical foramen after overinstrumentation by ProFile®, ProTaper™ and K3TMin simulated canals with different curvatures
  Hyun Yang, In-Seok Yang, Yun-Chann Hwang, In-Nam Hwang, Suk-Ja Yoon, Won-Jae Kim, Won-Mann Oh
  Journal of Korean Academy of Conservative Dentistry.2007; 32(2): 87.     CrossRef
• Comparison of shaping ability of rotary Ni-Ti file systems used by undergraduates
  Mun-Seong Kang, Hyeon-Cheol Kim, Bock Hur, Jeong-Kil Park
  Journal of Korean Academy of Conservative Dentistry.2006; 31(1): 1.     CrossRef
• A comparative study on the canal configuration after shaping by ProFile, ProTaper™ and K-Flexofile in simulated canals with different angles of curvature
  Bo-Kum Lee, Dong-Jun Kim, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
  Journal of Korean Academy of Conservative Dentistry.2005; 30(4): 294.     CrossRef

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• Role(s) of cytokines in pulpitis: Latest evidence and therapeutic approaches
  Mohammad M.Y. Khorasani, Gholamhossein Hassanshahi, Aniela Brodzikowska, Hossein Khorramdelazad
  Cytokine.2020; 126: 154896.     CrossRef

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• Effect of Different Sealers on the Cytocompatibility and Osteogenic Potential of Human Periodontal Ligament Stem Cells: An In Vitro Study
  Shehabeldin Saber, Shereen Raafat, Mohamed Elashiry, Ahmed El-Banna, Edgar Schäfer
  Journal of Clinical Medicine.2023; 12(6): 2344.     CrossRef
• Cytotoxicity of resin-based root canal sealer, adseal
  Hee-Jung Kim, Seung-Ho Baek, Woo-Cheol Lee, Han-Soo Park, Kwang-Shik Bae
  Journal of Korean Academy of Conservative Dentistry.2004; 29(6): 498.     CrossRef