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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Restorative Dentistry and Endodontics
Journal Basic Information
Journal DOI :
The Korean Academy of Conservative Dentistry
Editor in Chief :
Volume & Issues
Volume 35, Issue 6 - Nov 2010
Volume 35, Issue 5 - Sep 2010
Volume 35, Issue 4 - Jul 2010
Volume 35, Issue 3 - May 2010
Volume 35, Issue 2 - Mar 2010
Volume 35, Issue 1 - Jan 2010
Selecting the target year
INFECTION CONTROL OF LIGHT CURING UNITS
Chang, Hoon-Sang ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 235~237
DOI : 10.5395/JKACD.2010.35.4.235
When curing the composite restorations with light curing units, the light guides are often in direct contact with oral tissues, therefore contamination of light guides is inevitable. Curing light guides fall into the "semicritical" instrument category according to the Centers for Disease Control and Prevention (CDC) and must be heat or vapor-sterilized or at a minimum, these semicritical instruments must be sterilized in a liquid chemical agent. Currently, most common methods of maintaining sterility of the light guides are wiping the guide with a disinfectant, such as glutaraldehyde, after each patient use; using autoclavable guides; using presterilized, single-use plastic guides; and using translucent disposable barriers to cover the guide.
PULP TISSUE REGENERATION AND ROOT FORMATION OF PERMANENT TEETH WITH PULPAL/PERIAPICAL DISEASES
Yoo, Yeon-Jee ; Baek, Seung-Ho ; Son, Ho-Hyun ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 238~245
DOI : 10.5395/JKACD.2010.35.4.238
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.
AN EVALUATION OF ROTATIONAL STABILITY IN ENDODONTIC ELECTRONIC MOTORS
Park, Se-Hee ; Seo, Hyun-Woo ; Hong, Chan-Ui ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 246~256
DOI : 10.5395/JKACD.2010.35.4.246
The purpose of this study was to evaluate a rotational stability of endodontic electronic motors by comparing the changes of rotational speed, depending on the number of usages and with/without static load. Twelve new endodontic electronic motors were used in this study. Non contact type digital tachometer was used for measuring the rotational speed of handpiece. True RMS Multimeter was used for measuring the voltages and the electric currents. All measurements were recorded every 10 seconds during 10 minutes and repeated 9 times. Five repetition was done per each electronic motor. To statistical analysis, student t-test, repeated measures and Scheffe's post-hoc tests were performed. In the same motor group, there was no significant difference in all measurements. In all groups, there was no significant difference in the amount of rotational speed changes depending on the number of usages and with/without static load. In the limitation of this study, the results showed that all kinds of endodontic electronic motors in this study had an established rotational stability. Therefore they could be safely used in root canal treatment with a reliable maintenance of rotational speed, regardless of the number of usages and with/without load.
INFLUENCE OF POST TYPES AND SIZES ON FRACTURE RESISTANCE IN THE IMMATURE TOOTH MODEL
Kim, Jong-Hyun ; Park, Sung-Ho ; Park, Jeong-Won ; Jung, Il-Young ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 257~266
DOI : 10.5395/JKACD.2010.35.4.257
The purpose of this study was to determine the effect of post types and sizes on fracture resistance in immature tooth model with various restorative techniques. Bovine incisors were sectioned 8 mm above and 12 mm below the cementoenamel junction to simulate immature tooth model. To compare various post-and-core restorations, canals were restored with gutta-percha and resin core, or reinforced dentin wall with dual-cured resin composite, followed by placement of D.T. LIGHT-POST, ParaPost XT, and various sizes of EverStick Post individually. All of specimens were stored in the distilled water for 72 hours and underwent 6,000 thermal cycles. After simulation of periodontal ligament structure with polyether impression material, compressive load was applied at 45 degrees to the long axis of the specimen until fracture was occurred. Experimental groups reinforced with post and composite resin were shown significantly higher fracture strength than gutta-percha group without post placement (p < 0.05). Most specimens fractured limited to cervical third of roots. Post types did not influence on fracture resistance and fracture level significantly when cement space was filled with dual-cured resin composite. In addition, no statistically significant differences were seen between customized and standardized glass fiber posts, which cement spaces were filled with resin cement or composite resin individually. Therefore, root reinforcement procedures as above in immature teeth improved fracture resistance regardless of post types and sizes.
COMPARISON OF SCREW-IN EFFECT FOR SEVERAL NICKEL-TITANIUM ROTARY INSTRUMENTS IN SIMULATED RESIN ROOT CANAL
Ha, Jung-Hong ; Jin, Myoung-Uk ; Kim, Young-Kyung ; Kim, Sung-Kyo ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 267~272
DOI : 10.5395/JKACD.2010.35.4.267
Screw-in effect is one of the unintended phenomena that occurs during the root canal preparation with nickel-titanium rotary files. The aim of this study was to compare the screw-in effect among various nickel-titanium rotary file systems. Six different nickel-titanium rotary instruments (ISO 20/.06 taper) were used:
(SybronEndo, Glendora, CA, USA),
(VDW GmbH, Munchen, Germany), NRT with safe-tip and with active tip (Mani Inc., Shioya-gun, Japan), ProFile
(Dentsply-Maillefer, Ballaigues, Switzerland) and ProTaper
(Dentsply-Maillefer, Ballaigues, Switzerland). For ProTaper
, S2 was selected because it has size 20. Root canal instrumentations were done in sixty simulated single-curved resin root canals with a rotational speed of 300 rpm and single pecking motion. A special device was designed to measure the force of screw-in effect. A dynamometer of the device recorded the screw-in force during simulated canal preparation and the recorded data was stored in a computer with designed software (LCV-USE-VS, Lorenz Messtechnik GmbH, Alfdorf, Germany). The data were subjected to one-way ANOVA and Tukey's multiple range test for post-hoc test. P value of less than 0.05 was regarded significant. ProTaper
produced significantly more screw-in effects than any other instruments in the study (p < 0.001).
produced significantly more screw-in effects than
, and ProFile
(p < 0.001). There was no significant difference among
, NRT, and ProFile
(p > 0.05), and between NRT with active tip and NRT with safe one neither (p > 0.05). From the result of the present study, it was concluded, therefore, that there seems significant differences of screw-in effect among the tested nickel-titanium rotary instruments. The radial lands and rake angle of nickel-titanium rotary instrument might be the cause of the difference.
HISTOLOGY OF DENTAL PULP HEALING AFTER TOOTH REPLANTATION IN RATS
Go, Eun-Jin ; Jung, Han-Seong ; Kim, Eui-Seong ; Jung, Il-Young ; Lee, Seung-Jong ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 273~284
DOI : 10.5395/JKACD.2010.35.4.273
The objective of this study was to observe the histology of dental pulp healing after tooth replantation in rats. The maxillary right first molars of 4-week-old rat were extracted, and then the teeth were repositioned in the original socket. At 3 days after replantation, there was localized inflammatory reaction. But, pulp revasculization and healing had already begun in the root area. At 5 days after replantation, odontoblast-like cells were observed. Tertiary dentin deposition was observed beneath the pulp-dentin border from 1 week after replantation. And tertiary dentin was increased at 2 weeks after replantation. The presence of odontoblast-like cells and the formation of tertiary dentin were continued to 4 weeks after replantation. At 4 weeks after replantation, the deposition of bone-like tissues and cementum-like tissues was observed. This results show that there is a possibility of pulp healing after tooth replantation in rats and the mineralization of tooth can progress. The mineralization of tooth after replantation was initially occurred by the deposition of tertiary dentin, but as time passed, the deposition of bone-like tissues and cementum-like tissues was begun and increased.
THE EVALUATION OF PERIODONTAL LIGAMENT CELLS OF RAT TEETH AFTER LOW-TEMPERATURE PRESERVATION UNDER HIGH PRESSURE
Chung, Jin-Ho ; Kim, Jin ; Choi, Seong-Ho ; Kim, Eui-Seong ; Park, Ji-Yong ; Lee, Seung-Jong ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 285~294
DOI : 10.5395/JKACD.2010.35.4.285
The purpose of this study was to evaluate the viability of periodontal ligament cells of rat teeth after low-temperature preservation under high pressure by means of MTT assay, WST-1 assay. 12 teeth of Sprague-Dawley white female rats of 4 week-old were used for each group. Both side of the first and second maxillary molars were extracted as atraumatically as possible under tiletamine anesthesia. The experimental groups were group 1 (Immediate extraction), group 2 (Slow freezing under pressure of 3 MPa), group 3 (Slow freezing under pressure of 2 MPa), group 4 (Slow freezing under no additional pressure), group 5 (Rapid freezing in liquid nitrogen under pressure of 2 MPa), group 6 (Rapid freezing in liquid nitrogen under no additional pressure), group 7 (low-temperature preservation at
under pressure of 2 MPa), group 8 (low-temperature preservation at
under no additional pressure), group 9 (low-temperature preservation at
under pressure of 90 MPa). F-medium and 10% DMSO were used as preservation medium and cryo-protectant. For cryo-preservation groups, thawing was performed in
water bath, then MTT assay, WST-1 assay were processed. One way ANOVA and Tukey HSD method were performed at the 95% level of confidence. The values of optical density obtained by MTT assay and WST-1 were divided by the values of eosin staining for tissue volume standardization. In both MTT and WST-1 assay, group 7 (
/2 MPa) showed higher viability of periodontal ligament cells than other group (2-6, 8) and this was statistically significant (p < 0.05), but showed lower viability than group 1, immediate extraction group (no statistical significance). By the results of this study, low-temperature preservation at
under pressure of 2 MPa suggest the possibility for long term preservation of teeth.
ANALYSIS OF PARA-CHLOROANILINE AFTER CHEMICAL INTERACTION BETWEEN ALEXIDINE AND SODIUM HYPOCHLORITE USING MASS SPECTROMETRY
Kim, Hyeon-Sik ; Han, Seung-Hyun ; Oh, So-Ram ; Lim, Sang-Min ; Gu, Yu ; Kum, Kee-Yeon ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 295~301
DOI : 10.5395/JKACD.2010.35.4.295
Recent studies demonstrated that the combination of chlorhexidine (CHX) and sodium hypochlorite (NaOCl) resulted in the formation of a precipitate, para-chloroaniline (PCA). Alexdidine (ALX) is a kind of biguanides like CHX, and has stronger detoxification effect against the bacterial virulence factors such as lipoteichoic acid and lipopolysacchardide compared with CHX. The purpose of this study was to determine whether PCA was formed after chemical interaction between ALX and NaOCl using mass spectrometry. Mass spectrometry was performed for the mixture of five different concentrations of ALX (1, 0.5, 0.25, 0.125, 0.0625%) and 4% NaOCl. Results showed that the peak of PCA was not detected in mixed solutions of ALX and NaOCl in mass spectrometry analysis. The color of mixed solution of ALX and NaOCl after chemical interaction was light yellow to white, but there wasn't any precipitate found.
ROOT CANAL TREATMENT OF A MANDIBULAR SECOND PREMOLAR WITH THREE SEPARATE ROOT CANALS
Lee, Seok-Ryun ; Shin, Seol-Hee ; Hong, Sung-Ok ; Song, Chang-Kyu ; Chang, Hoon-Sang ; Min, Kyung-San ;
Restorative Dentistry and Endodontics, volume 35, issue 4, 2010, Pages 302~305
DOI : 10.5395/JKACD.2010.35.4.302
Mandibular premolars show a wide variety of root canal anatomy. Especially, the occurrence of three canals with three separate foramina in mandibular second premolars is very rare. This case report describes the root canal treatment of an unusual morphological configuration of the root canal system and supplements previous reports of the existence of such configuration in mandibular second premolar.