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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

It has been documented that periodontopathic bacteria are also implicated in endodontic infections. 16S rDNA gene-directed PCR was to examine the prevalence of periodontopathic bacteria including Actinobacillus actinomycetemcomitans (Aa), Prevotella intermedia (Pi), Prevotella nigrescens (Pn), Porphyromonas gingivalis (Pg), Porphyromonas endodontalis (Pe), and Treponema denticola (Td) in the root canals of 36 endodontically infected teeth having apical lesions with or without clinical symptoms like pain, swelling, and fistula.

In 36 infected root canals, most frequently detected bacterial species was Pg (61.1%), followed by Td (52.8%) and Pe (38.9%).

High prevalence of BPB in the symptomatic teeth but low in the asymptomatic teeth suggests that BPB may play an important role in the pathogenesis of periapical lesions.

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• Isolation of Propionibacterium acnes among the microbiota of primary endodontic infections with and without intraoral communication
  Sadia Ambreen Niazi, Hana Suleiman Al Kharusi, Shanon Patel, Kenneth Bruce, David Beighton, Federico Foschi, Francesco Mannocci
  Clinical Oral Investigations.2016; 20(8): 2149.     CrossRef
• Antimicrobial Activity of Isothiocyanates （ITCs） Extracted from Horseradish （Armoracia rusticana） Root against Oral Microorganisms
  HO-WON PARK, KYU-DUCK CHOI, IL-SHIK SHIN
  Biocontrol Science.2013; 18(3): 163.     CrossRef
• Microbial profile of asymptomatic and symptomatic teeth with primary endodontic infections by pyrosequencing
  Sang-Min Lim, Tae-Kwon Lee, Eun-Jeong Kim, Jun-Hong Park, Yoon Lee, Kwang-Shik Bae, Kee-Yeon Kum
  Journal of Korean Academy of Conservative Dentistry.2011; 36(6): 498.     CrossRef

Ormocer has organic-inorganic compound polymers. One of advantages of ormocer is reduced polymerization shrinkage. The purpose of this study was to compare the amount of contraction shrinkage of composite resins and ormocers. Additionally, the time of each material when there is no further change of contraction shrinkage was analysed.

Four brands of composite resins (P-60, Surefil, Z-250 and Denfil) and two brands of ormocers (Definite and Admira) were used. 20 seconds, 40 seconds and 60 seconds of curing times were given. Contraction shrinkage of them were measured using a linometer for 80 seconds.

The effect of material and curing time to contraction shrinkage at the time of 80 seconds was analysed by two-way ANOVA. The effect of time to contraction shrinkage was analysed by one-way ANOVA, and the time when there was no further change of the contraction shrinkage was analysed. The results are as follows :

P-60, Definite, Z-250 and Denfil had no further change of contraction shrinkage from the time of 20 seconds, and Surefil and Admira had no further change of contraction shrinkage from the time of 10 seconds.

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• Polymerization shrinkage and stress analysis during dental restoration observed by digital image correlation method
  Jung-Hoon Park, Nak-Sam Choi
  Journal of Mechanical Science and Technology.2021; 35(12): 5435.     CrossRef
• Acoustic emission characteristics of methacrylate-based composite and silorane-based composite during dental restoration according to a variety of C-factor
  Jung-Hoon Park, Ja-Uk Gu, Nak-Sam Choi
  Journal of Mechanical Science and Technology.2017; 31(9): 4067.     CrossRef
• Behavior of Polymerization Shrinkage Stress of Methacrylate-based Composite and Silorane-based Composite during Dental Restoration
  Jung-Hoon Park, Nak-Sam Choi
  Composites Research.2015; 28(1): 6.     CrossRef

This study was performed to evaluate the actual temperature rise on the surface of Buchanan plugger using thermocouple. The heat carrier system 'System B Heatsource' (Model 1005, Analytic Technologies, Redmond, WA, USA) and the Buchanan pluggers of F, FM, M and ML sizes are used for this study. The temperature was set to 200℃ on digital display and the power level on it was set to 10. Five thermocouples were placed in direct contact with the surface of each size of Buchanan's pluggers at 1 mm increments from the tip to the 4 mm length of shank. The heat control spring was touched for 5 seconds, and the temperature rise on the surface of the pluggers were measured at 1 sec intervals for more than 5 seconds with an accuracy of 0.01 using Data Logger. The data were statistically analyzed by one-way ANOVA.

The results were as follows.

The position at which the temperature peaked was approximately at 1~2 mm far from the tip of Buchanan plugger (p<0.01).

This results suggest that the actual temperature on the surface of the pluggers does not correlate well with the temperature set on digital display. Heat concentrates around the tip. The larger plugger reveals lower temperature rise relatively.

This study was conducted to evaluate the temperature rise on the root surface while the root canal is being obturated using continuous wave of condensation technique. Maxillary central incisor was prepared for repeated canal obturation. Ten thermocouples (Omega Engineering Inc., Stanford, USA) were placed at 1 mm increment from the anatomical root apex. The real temperature of Buchanan plugger was recorded before insertion into the root canal. The root canal was obturated with continuous wave of condensation technique as described by Buchanan and the root surface temperature was recorded during obturation at 150℃, 200℃, 250℃ and 300℃ temperature settings of System B HeatSource (Model 1005, Analytic technologies, Redmond, WA, USA). After completion of the temperature recording, the dentinal-cementum thickness at each sites was measured. The data were analyzed using one-way ANOVA followed by Scheffe' s test and linear regression test.

The results were as follows.

When the temperature was set at 150℃, 200℃, 250℃ and 300℃ on the digital display of System B HeatSource, the real temperature of the plugger at the 1mm point from the tip revealed 130.82±2.96℃, 158.00±5.26℃, 215.92±6.91℃ and 249.88±3.65℃ respectively.

These results suggest that it be relatively kind to the supporting tissues of the root that the root canal is obturated using continuous wave of condensation technique at 150℃, 200℃, 250℃ and 300℃ temperature settings on digital temperature display of System B HeatSource.

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• A Case of Smith-Magenis Syndrome with Multiple Organ Malformations
  Sung Eun Kim, Geonju Kim, Jin Soon Suh, Juyoung Lee
  Neonatal Medicine.2017; 24(1): 49.     CrossRef
• Comparison of apical sealing efficacies using different plugging depth in continuous wave of obturation technique
  Sang-Jin Lee, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
  Journal of Korean Academy of Conservative Dentistry.2007; 32(6): 491.     CrossRef
• Comparison of apical sealing ability of continuous wave of obturation technique using EndoTwinn and System B
  Hyun-Ju Shin, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
  Journal of Korean Academy of Conservative Dentistry.2007; 32(6): 522.     CrossRef

The purpose of present study was to evaluate the polymerization shrinkage stress and amount of linear shrinkage of composites and compomers for posterior restoration.

For this purpose, linear polymerization shrinkage and polymerization stress were measured.

For linear polymerization shrinklage and polymerization stress measurement, custom made Linometer (R&B, Daejon, Korea) and Stress measuring machine was used (R&B, Daejon, Korea). Compositers and compomers were evaluated; Dyract AP (Dentsply Detrey, Gumbh. German) Z100 (3M Dental Products, St. Paul, USA) Surefil (Dentsply Caulk, Milford, USA) Pyramid(Bisco, Schaumburg, USA) Synergy Compact (Coltene, Altstatten, Switzerland), Heliomolar (Vivadent/Ivoclar, Liechtenstein), and Compoglass (Vivadent Ivoclar/Liechtenstein) were used. 15 measurements were made for each material. Linear polymerization shrinkage or polymerization stress for each material was compared with one way ANOVA with Tukey at 95% levels of confidence.

For linear shrinkage; Heliomolar, Surefil<Synergy Compact, Z100<Dyract AP<Pyramid, Compoglass F (p<0.05)

For Shrinkage stress; Heliomolar<Z100, Pyramid<Synergy Compact, Compoglass F<Dyract AP<Heliomolar HB, Surefil (p<0.05)

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• A comparative study on color and dimensional stability of esthetic indirect dental materials
  Hye-Yun Heo, Hyo-Jin Son, Yu-Ri Heo, Mee-Kyoung Son
  Oral Biology Research.2019; 43(4): 306.     CrossRef
• Measurement of the Internal Adaptation of Resin Composites Using Micro-CT and Its Correlation With Polymerization Shrinkage
  HJ Kim, SH Park
  Operative Dentistry.2014; 39(2): e57.     CrossRef
• Comparison of Premolar Cuspal Deflection in Bulk or in Incremental Composite Restoration Methods
  ME Kim, SH Park
  Operative Dentistry.2011; 36(3): 326.     CrossRef
• Effect of intermittent polymerization on the rate of polymerization shrinkage and cuspal deflection in composite resin
  Min Kyung Kim, Sung Ho Park, Deog Gyu Seo, Yun Jung Song, Yoon Lee, Chan Young Lee
  Journal of Korean Academy of Conservative Dentistry.2008; 33(4): 341.     CrossRef
• Correlation Between the Amount of Linear Polymerization Shrinkage and Cuspal Deflection
  S-Y. Lee, S-H. Park
  Operative Dentistry.2006; 31(3): 364.     CrossRef
• Correlation between Linear polymerization shrinkage & tooth cuspal deflection
  Soon-Young Lee, Sung-Ho Park
  Journal of Korean Academy of Conservative Dentistry.2005; 30(6): 442.     CrossRef

This study evaluated the effectiveness of the light emitting diode(LED) units for composite curing. To compare its effectiveness with conventional quartz tungsten halogen (QTH) light curing unit, the microhardness of 2mm composite, Z250, which had been light cured by the LEDs (Ultralume LED2, FreeLight, Developing product D1) or QTH (XL 3000) were compared on the upper and lower surface. One way ANOVA with Tukey and Paired t-test was used at 95% levels of confidence. In addition, the amount of linear polymerization shrinkage was compared between composites which were light cured by QTH or LEDs using a custom-made linometer in 10s and 60s of light curing, and the amount of linear polymerization shrinkage was compared by one way ANOVA with Tukey.

The amount of polymerization shrinkage at 10s was

XL3000 > Ultralume 2, 40, 60> FreeLight, D1 (P<0.05)

The amount of polymerization shrinkage at 60s was

XL3000 > Ultralume 2, 60> Ultralume 2,40> FreeLight, D1 (P<0.05)

The microhardness on the upper and lower surface was as follows;

It was concluded that the LEDs produced lower polymerization shrinkage in 10s and 60s compared with QTH unit. In addition, the microhardness of samples which had been cured with LEDs was lower on the lower surfaces than the upper surfaces whereas there was no difference in QTH cured samples.

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• The polymerization rate and the degree of conversion of composite resins by different light sources
  Joo-Hee Ryoo, In-Bog Lee, Hyun-Mee Yoo, Mi-Ja Kim, Chang-In Seok, Hyuk-Choon Kwon
  Journal of Korean Academy of Conservative Dentistry.2004; 29(4): 386.     CrossRef
• Measurements of shrinkage stress and reduction of inter-cuspal distance in maxillary premolars resulting from polymerization of composites and compomers
  Soon-Young Lee, Sung-Ho Park
  Journal of Korean Academy of Conservative Dentistry.2004; 29(4): 346.     CrossRef