Restorative Dentistry & Endodontics

Theory of X-ray microcomputed tomography in dental research: application for the caries research: Young-Seok Park, Kwang-Hak Bae, Juhea Chang, Won-Jun Shon; J Korean Acad Conserv Dent 2011;36(2):98-107. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.98

Caries remains prevalent throughout modern society and is the main disease in the field of dentistry. Although studies of this disease have used diverse methodology, recently, X-ray microtomography has gained popularity as a non-destructive, 3-dimensional (3D) analytical technique, and has several advantages over the conventional methods. According to X-ray source, it is classified as monochromatic or polychromatic with the latter being more widely used due to the high cost of the monochromatic source despite some advantages. The determination of mineral density profiles based on changes in X-ray attenuation is the principle of this method and calibration and image processing procedures are needed for the better image and reproducible measurements. Using this tool, 3D reconstruction is also possible and it enables to visualize the internal structures of dental caries. With the advances in the computer technology, more diverse applications are being studied, such automated caries assessment algorithms.

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Synchrotron X-ray Studies of the Structural and Functional Hierarchies in Mineralised Human Dental Enamel: A State-of-the-Art Review
Cyril Besnard, Ali Marie, Sisini Sasidharan, Robert A. Harper, Richard M. Shelton, Gabriel Landini, Alexander M. Korsunsky
Dentistry Journal.2023; 11(4): 98. CrossRef
Revelation of microcracks as tooth structural element by X-ray tomography and machine learning
Irma Dumbryte, Donatas Narbutis, Arturas Vailionis, Saulius Juodkazis, Mangirdas Malinauskas
Scientific Reports.2022;[Epub] CrossRef
Three-dimensional non-destructive visualization of teeth enamel microcracks using X-ray micro-computed tomography
Irma Dumbryte, Arturas Vailionis, Edvinas Skliutas, Saulius Juodkazis, Mangirdas Malinauskas
Scientific Reports.2021;[Epub] CrossRef
Radiological Appraisal of Biodentine and Pulpotec Individually or in Combination with Photo-activated Disinfection as Pulp-capping Cements in Mature Teeth
Pratik Agrawal, Gaurav Patri, Surabhi Soumya, Prasanti K Pradhan, Vijeta Patri
The Journal of Contemporary Dental Practice.2021; 22(9): 1014. CrossRef
Ex vivoevaluation of new 2D and 3D dental radiographic technology for detecting caries
Laurence Gaalaas, Donald Tyndall, André Mol, Eric T Everett, Ananta Bangdiwala
Dentomaxillofacial Radiology.2016; 45(3): 20150281. CrossRef
Stationary intraoral digital tomosynthesis using a carbon nanotube X-ray source array
J Shan, A W Tucker, L R Gaalaas, G Wu, E Platin, A Mol, J Lu, O Zhou
Dentomaxillofacial Radiology.2015; 44(9): 20150098. CrossRef
Comparative efficacy of photo-activated disinfection and calcium hydroxide for disinfection of remaining carious dentin in deep cavities: a clinical study
Sidhartha Sharma, Ajay Logani, Naseem Shah
Restorative Dentistry & Endodontics.2014; 39(3): 195. CrossRef
Current status of dental caries diagnosis using cone beam computed tomography
Young-Seok Park, Jin-Soo Ahn, Ho-Beom Kwon, Seung-Pyo Lee
Imaging Science in Dentistry.2011; 41(2): 43. CrossRef

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Effect of the difference in spectral outputs of the single and dual-peak LEDs on the microhardness and the color stability of resin composites: Hye-Jung Park, Sung-Ae Son, Bock Hur, Hyeon-Cheol Kim, Yong-Hoon Kwon, Jeong-Kil Park; J Korean Acad Conserv Dent 2011;36(2):108-113. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.108

Abstract PDF PubReader ePub

Objectives

To determine the effect of the spectral output of single and dual-peak light emitting diode (LED) curing lights on the microhardness and color stability of commercial resin composites formulated with camphorquinone and alternative photoinitiators in combination.

Materials and Methods

Three light-polymerized resin composites (Z100 (3M ESPE), Tetric Ceram (Ivoclar Vivadent) and Aelite LS Posterior (Bisco)) with different photoinitiator systems were used. The resin composites were packed into a Teflon mold (8 mm diameter and 2 mm thickness) on a cover glass. After packing the composites, they were light cured with single-peak and dual-peak LEDs. The Knoop microhardness (KHN) and color difference (ΔE) for 30 days were measured. The data was analyzed statistically using a student's t-test (p < 0.05).

Results

All resin composites showed improved microhardness when a third-generation dual-peak LED light was used. The color stability was also higher for all resin composites with dual-peak LEDs. However, there was a significant difference only for Aelite LS Posterior.

Conclusions

The dual-peak LEDs have a beneficial effect on the microhardness and color stability of resin composites formulated with a combination of camphorquinone and alternative photoinitiators.

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Effect of irradiance from curing units on the microhardness of composite - a systematic review
Neenu Francis, Rakesh R. Rajan, Vijay Kumar, Anju Varughese, Vineetha Karuveetil, C. M. Sapna
Evidence-Based Dentistry.2022;[Epub] CrossRef
Micro-computed tomography evaluation of volumetric polymerization shrinkage and degree of conversion of composites cured by various light power outputs
Pablo J. ATRIA, Camila S. SAMPAIO, Eduardo CÁCERES, Jessica FERNÁNDEZ, Andre F. REIS, Marcelo GIANNINI, Paulo G. COELHO, Ronaldo HIRATA
Dental Materials Journal.2018; 37(1): 33. CrossRef
Effect of the irradiance distribution from light curing units on the local micro-hardness of the surface of dental resins
Thomas Haenel, Berenika Hausnerová, Johannes Steinhaus, Richard B.T. Price, Braden Sullivan, Bernhard Moeginger
Dental Materials.2015; 31(2): 93. CrossRef
1,3-Butadiene as an Adhesion Promoter Between Composite Resin and Dental Ceramic in a Dielectric Barrier Discharge Jet
Geum-Jun Han, Sung-No Chung, Bae-Hyeock Chun, Chang-Keun Kim, Kyu Hwan Oh, Byeong-Hoon Cho
Plasma Chemistry and Plasma Processing.2013; 33(2): 539. CrossRef
Optimal combination of 3-component photoinitiation system to increase the degree of conversion of resin monomers
Chang-Gyu Kim, Ho-Jin Moon, Dong-Hoon Shin
Journal of Korean Academy of Conservative Dentistry.2011; 36(4): 313. CrossRef

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Patients' perception and satisfaction with apicoectomy: Euiseong Kim, Seung-Jong Lee, Jeong-Won Park, Su-Jung Shin; J Korean Acad Conserv Dent 2011;36(2):114-118. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.114

Abstract PDF PubReader ePub: Objectives
This study was aimed to examine the patients' perception and satisfaction with the results of endodontic microsurgery which was apicoectomy with retrofilling.
Materials and Methods
A questionnaire was given to 109 patients, who were recalled after a minimum of 3 months upon endodontic microsurgery in the Department of Conservative Dentistry, Yonsei University. A contingency table and correlation analysis were used to determine if there were any correlations between age/gender and the patients' responses (p = 0.05).
Results
Approximately 60% of respondents answered they had never heard of surgical endodontic procedures. 63.3% of respondents chose the surgical option because they wanted to keep their natural teeth. If the patient required the same procedure on another tooth later, 100 out of 109 respondents answered they would choose microsurgery instead of extraction. Most patients (82.57%) appeared to be satisfied with the surgical procedure.
Conclusions
Endodontic microsurgery consisting of apicoectomy and retrofilling seems to appeal to majority of patients as a satisfactory and valuable treatment choice.

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The evaluation of surface roughness and polishing time between polishing systems: Ye-Mi Kim, Su-Jung Shin, Min-Ju Song, Jeong-Won Park; J Korean Acad Conserv Dent 2011;36(2):119-124. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.119

Abstract PDF PubReader ePub

Objectives

The purpose of this experiment was to evaluate four different polishing systems of their polishability and polishing time.

Materials and Methods

4 mm diameter and 2 mm thickness Teflon mold was made. Z-250 (3M ESPE) hybrid composite resin was slightly overfilled and pressed with slide glass and cured with Optilux 501 for 40 sec each side. Then the surface roughness (glass pressed: control group) was measured with profilometer. One surface of the specimen was roughened by #320 grit sand paper and polished with one of the following polishing systems; Sof-Lex (3M ESPE), Jiffy (Ultradent), Enhance (Dentsply/Caulk), or Pogo (Dentsply/Caulk). The surface roughness and the total polishing time were measured. The results were analyzed with one-way ANOVA and Duncan's multiple range test.

Results

The surface roughness was lowest in Pogo, and highest in Sof-Lex. Polishing times were shortest with Pogo, and followed by the Sof-Lex, Enhance and Jiffy.

Conclusions

One-step polishing system (Pogo) is very effective to get the smooth surface in a short time, therefore it can be recommended for final polishing system of the restoration.

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Observation of surface roughness on three types of resin based on grinding time of dental automatic barrel finishing
An-Na Jung, Hyeon-Jeong Ko, Yu-Jin Park
Journal of Korean Acedemy of Dental Technology.2021; 43(2): 56. CrossRef
Observations of surface roughness of Co-Cr alloys according to grinding time of dental barrel finishing
Hyeon-Jeong Ko, Yu-Jin Park, Sung-Min Choi
Journal of Korean Acedemy of Dental Technology.2021; 43(3): 93. CrossRef
Component and surface residue observation of barrel finishing media for grinding dental resins
An-Na Jung, Yu-Jin Park, Sung-Min Choi
Journal of Korean Acedemy of Dental Technology.2021; 43(4): 145. CrossRef
Performance of a novel polishing rubber wheel in improving surface roughness of feldspathic porcelain
Geum-Jun HAN, Jae-Hoon KIM, Mi-Ae LEE, So-Yeon CHAE, Yun-Hee LEE, Byeong-Hoon CHO
Dental Materials Journal.2014; 33(6): 739. CrossRef

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Effect of surface treatment of FRC-Post on bonding strength to resin cements: Chan-Hyun Park, Se-Hee Park, Jin-Woo Kim, Kyung-Mo Cho; J Korean Acad Conserv Dent 2011;36(2):125-131. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.125

Abstract PDF PubReader ePub

Objectives

The purpose of this study was to evaluate the effect of surface treatment of FRC-Post on bonding strength to resin cements.

Materials and Methods

Pre-surface treated LuxaPost (DMG), Rely-X Fiber Post (3M ESPE) and self adhesive resin cement Rely-X Unicem (3M ESPE), conventional resin cement Rely-X ARC (3M ESPE), and Rely-X Ceramic Primer (3M ESPE) were used. After completing the surface treatments of the posts, posts and resin cement were placed in clear molds and photo-activation was performed. The specimens were sectioned perpendicular to the FRC-Post into 2 mm-thick segments, and push-out strength were measured. The results of bond strength value were statistically analyzed using independent samples t-test and one-way ANOVA with multiple comparisons using Scheffe's test.

Results

Silanization of posts affect to the bond strength in LuxaPost, and did not affect in Rely-X Fiber Post. Rely-X ARC showed higher value than Rely-X Unicem.

Conclusions

Silanization is needed to enhance the bond strength between LuxaPost and resin cements.

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Comparative evaluation of fracture resistance and push-out bond strength of glass fiber post with composite core and single-unit post and core system luted with two different resin cements: An in vitro study
Ishika Garg, Pragya Kumar, Sonali Taneja
Endodontology.2024; 36(3): 240. CrossRef
Comparison of push-out bond strength of fiber-reinforced composite resin posts according to cement thickness
Jun-Seong Park, Jeong-Sub Lee, Jeong-Won Park, Won-Gyun Chung, Eun-Hee Choi, Yoon Lee
The Journal of Prosthetic Dentistry.2017; 118(3): 372. CrossRef
Currently there are so many fiber reinforced composite posts in the market. Some products are factory silanated but some products are not. Should I use silane for surface treatment of fiber reinforced composite posts?
Kyung-Mo Cho
Restorative Dentistry & Endodontics.2012; 37(2): 127. CrossRef

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Effect of curing modes on micro-hardness of dual-cure resin cements: Ki-Deok Lee, Se-Hee Park, Jin-Woo Kim, Kyung-Mo Cho; J Korean Acad Conserv Dent 2011;36(2):132-138. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.132

Abstract PDF PubReader ePub: Objectives
The purpose of this study was to evaluate curing degree of three dual-cure resin cements with the elapsed time in self-cure and dual-cure mode by means of the repeated measure of micro-hardness.
Materials and Methods
Two dual-cure self-adhesive resin cements studied were Maxcem Elite (Kerr), Rely-X Unicem (3M ESPE) and one conventional dual-cure resin cement was Rely-X ARC resin cement (3M ESPE). Twenty specimens for each cements were made in Teflon mould and divided equally by self-cure and dual-cure mode and left in dark, 36℃, 100% relative humidity conditional-micro-hardness was measured at 10 min, 30 min, 1 hr, 3 hr, 6 hr, 12 hr and 24 hr after baseline. The results of micro-hardness value were statistically analyzed using independent samples t-test and one-way ANOVA with multiple comparisons using Scheffe's test.
Results
The micro-hardness values were increased with time in every test groups. Dual-cure mode obtained higher micro-hardness value than self-cure mode except after one hour of Maxcem. Self-cured Rely-X Unicem showed lowest value and dual-cured Rely-X Unicem showed highest value in every measuring time.
Conclusions
Sufficient light curing to dual-cure resin cements should provided for achieve maximum curing.

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The effect of the strength and wetting characteristics of Bis-GMA/TEGDMA-based adhesives on the bond strength to dentin: Eun-Sook Park, Chang-Keun Kim, Ji-Hyun Bae, Byeong-Hoon Cho; J Korean Acad Conserv Dent 2011;36(2):139-148. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.139

Abstract PDF PubReader ePub

Objectives

This study investigated the effect of the strength and wetting characteristics of adhesives on the bond strength to dentin. The experimental adhesives containing various ratios of hydrophobic, low-viscosity Bis-M-GMA, with Bis-GMA and TEGDMA, were made and evaluated on the mechanical properties and bond strength to dentin.

Materials and Methods

Five experimental adhesives formulated with various Bis-GMA/Bis-M-GMA/TEGDMA ratios were evaluated on their viscosity, degree of conversion (DC), flexural strength (FS), and microtensile bond strength (MTBS). The bonded interfaces were evaluated with SEM and the solubility parameter was calculated to understand the wetting characteristics of the adhesives.

Results

Although there were no significant differences in the DC between the experimental adhesives at 48 hr after curing (p > 0.05), the experimental adhesives that did not contain Bis-GMA exhibited a lower FS than did those containing Bis-GMA (p < 0.05). The experimental adhesives that had very little to no TEGDMA showed significantly lower MTBS than did those containing a higher content of TEGDMA (p < 0.05). The formers exhibited gaps at the interface between the adhesive layer and the hybrid layer. The solubility parameter of TEGDMA approximated those of the components of the primed dentin, rather than Bis-GMA and Bis-M-GMA.

Conclusions

To achieve a good dentin bond, a strong base monomer, such as Bis-GMA, cannot be completely replaced by Bis-M-GMA for maintaining mechanical strength. For compatible copolymerization between the adhesive and the primed dentin as well as dense cross-linking of the adhesive layer, at least 30% fraction of TEGDMA is also needed.

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Equivalence study of the resin-dentine interface of internal tunnel restorations when using an enamel infiltrant resin with ethanol-wet dentine bonding
Andrej M. Kielbassa, Sabrina Summer, Wilhelm Frank, Edward Lynch, Julia-Susanne Batzer
Scientific Reports.2024;[Epub] CrossRef
Physical properties and cytotoxicity of antimicrobial dental resin adhesives containing dimethacrylate oligomers of Ciprofloxacin and Metronidazole
Yasaman Delaviz, Timothy W. Liu, Ashley R. Deonarain, Yoav Finer, Babak Shokati, J. Paul Santerre
Dental Materials.2019; 35(2): 229. CrossRef

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Partial pulp necrosis caused by excessive orthodontic force: Min-Young Kim, Seung-Jong Lee, Il-Young Jung, Euiseong Kim; J Korean Acad Conserv Dent 2011;36(2):149-153. Published online March 31, 2011; DOI: https://doi.org/10.5395/JKACD.2011.36.2.149

Abstract PDF PubReader ePub: As the dental pulp is encased with a rigid, noncompliant shell, changes in pulpal blood flow or vascular tissue pressure can have serious implication for the health of pulp. Numerous studies have demonstrated that orthodontic force application may influence both blood flow and cellular metabolism, leading degenerative and/or inflammatory responses in the dental pulp. The aim of this case report is to present a case about tooth with chronic periapical abscess which showed normal vital responses. Excessive orthodontic force is thought to be the prime cause of partial pulp necrosis. Owing to remaining vital tissue, wrong dianosis can be made, and tooth falsely diagnosed as vital may be left untreated, causing the necrotic tissue to destroy the supporting tissuses. Clinician should be able to utilize various diagnostic tools for the precise diagnosis, and be aware of the endodontic-orthodontic inter-relationship.

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