Gutta percha 충전시 도말층 유무에 따른 근관벽과의 접합도에 관한 주사전자현미경적 연구

문주훈,조영곤 朝鮮大學校 口腔生物學硏究所 1991 口腔生物學硏究 Vol.15 No.-

The purpose of this study was to evaluate the adaptation of filling material to the dentimal walls of root canals with and without smear layer. Fifty extracted upper and lower anterior teeth were selected, and the root canals were instrumented with K-files 1㎜ short of the apical foramen by step-back method. The teeth were randomly divided into two groups of 25 each : in the group Ⅰ, smear layers were not removed, and in the group Ⅱ, smear layers were removed by 15% EDTA solution. Again the two groups of 25 teeth were randomly divided into unfilled contol group and filling groups (lateral, ultrasonic, ULTRAFIL, McSpadden compaction group). Upon completion of root canal filling, the teeth were grooved on the both the labial and lingual surfaces and then split with mallet and chisel. Each specimens were examined with JSM-840 Scanning Electron Microscope (JEOL., Japan). The results were as follows : 1. In the contol group, dentinal tubules of group Ⅰ couldn't be distinguished in the canal wall, but those of group Ⅱ appeared to be open and patent. 2. In the filling groups of group Ⅰ, the tubular penetration of the sealer or gutta percha couldn's be seen, but in the filling groups of group Ⅱ, it could be seen except McSpadden compaction group. 3. In the filling groups, ULTRAFIL group showed the best adaptation of filling material to root canal wall among the group Ⅰ, and lateral and ultrasonic condensation group compaction group showed the worst adaptation in group Ⅰ, Ⅱ. 4. Generally, the group Ⅱ showed better adaptation of filling material to root canal wall than the group Ⅰ.

근관 포스트와 코어수복의 증례 선택

문주훈 대한치과의사협회 2001 대한치과의사협회지 Vol.39 No.1

구치부 복합레진 수복을 위한 와동 이장용 재료의 방사선불투과성에 관한 연구

문주훈,최의환 大韓口腔顎顔面 放射線學會 2000 Imaging Science in Dentistry Vol.30 No.4

Purpose : The aim of this study was to determine the relative radiopacities of cavity lining materials (Resin-modified Glass Ionomer cement, Composer and plowable resin) for posterior composite resin restoration. Material & Methods : Resin-modified glass ionomer cement (Fuji II LC, VitrebondTM), Compomers (Dyract□, Compoglass, F2,000, Dyract□ flow Compoglass Flow) find Flowable resins (Tetric□ flow, AelitefloTM RevolutionTM) were used. Five specimens of 5 mm in diameter and 2 mm thick were fabricated with each material. Human molars were horizontally sectioned 2 mm thick to include both enamel and dentin. The radiopacities of enamel, dentin, cavity lining materials, aluminum step wedge were obtainded from conventional radiograph and NIH image program. Results : All the tested lining materials showed levels of radiopacity the same as or greater than that of dentin. All compomer tested (Dyract□, Compoglass, F2,000, Dyract□ flow, Compoglass Flow) and VitrebondTM, Tetric□ flow were more radiopaque than enamel. The radiopacities of Fuji II LC and RevolutionTM were between enamel and dentin and resin-modified glass ionomer cement, Compomer and Tetric□ flow were greater than those of RevolutionTM, AelitefloTM or dentin. The level of radiopacity of the tested materials was variable; those with low radiopacity should be avoided in class II restorations, where a clear determination of recurrent caries by the examining clinician could be compromised. Conclusion : Clinician should be able to distinguish these cavity lining materials radiographically from recurrent decay, voids, gaps, or other defects that lead to clinical failure. Utilization of materials ranked more radiopaque than enamel would enable clinicians to distinguish the lining material from tooth structure. (Korean J Oral Maxillofac Radiol 2000; 30:243-248)

구치부 복합레진 수복시 유동성 레진의 이장효과에 관한 연구

문주훈,김영관,노기선 朝鮮大學校 口腔生物學硏究所 2001 口腔生物學硏究 Vol.25 No.1

The purpose of this study was to evaluate the marginal microleakage of condensable composite resin restorations according to flowable resin lining of internal cavity wall. The sixty extracted human molar teeth without caries and/or restorations are used. The experimental teeth were randomly assigned into three groups of ten teeth each. The conventional class Ⅱ cavities (box-shaped on mesial and distal surface, faciolingual width : 3㎜, gingival wall dept : 1.5㎜) were prepared 1㎜ below cementoenamel junction with a #701 carbide bur. The teeth were divided into three groups, and then each group were subdevided into A & B group according to flowable resin & compomer lining : Group 1-A : Ariston pHc filling, Group 1-B : Tetric Flow lining and Ariston pHc filling, Group 2-A : sureFil filling, Group 2-B : Dyract Flow lining and SureFil filling, Group 3-A : Pyramid filling, Group 3-B : Aeliteflo lining and Pyramid filling. All the materials used were applied according to the manufacturers' instructions. The specimens were stored in the 100% humidity for 7 days prior to thermocycling (100 thermal cycles of 5-55℃ water with a 30-second dwell time). The specimens were immersed in 2% metyleneblus dye for 24 hours, and then embedded in transparent acrylic resin and sectioned mesiodistally with diamond wheel saw. The degree of marginal leakage was scored under stereomicroscope (x20) and the data were analyzed by Kruskal-Wallis test and Wilcoxon signed ranks test. The results were as follows : 1. In the gingival margins of all the group, microleakage of subgroup B was less than subgroup A. 2. In the group 1, 3, there was significant differences between subgroup A and B (p<0.05), but there was not significant differenc between group 2-A(SureFil) and group 2-B (Dyract flow/SureFil) (p>0.05). 3. From the results above, it was suggested that the cavity lining of flowable resin and flowable compomer in condensable resin restoration decrease microleakage at gingival margin, and does improve their ability to seal the gingival margin of class Ⅱ preparation.

수종 수복재의 세포독성에 관한 연구

문주훈,박주철,고기종 朝鮮大學校 口腔生物學硏究所 1998 口腔生物學硏究 Vol.22 No.1

The purpose of this study was to investigate the cytotoxocity of dental restorative materials - dental amalgam, type Ⅱ casting gold alloy, composite resin inlay - on fibroblasts cultivated from human gingiva. Viable cell count and succinate dehydrogenase activity test were preformed to evaluate the short-term cytotoxicity. According to 2,4 and 6 days vital cell count and succinate dehydrogenage activity test to fibroblast were evaluated. The results were as follows : 1. In the cell morphology observation, viable cell number of amalgam & composite resin inlay group decreased after 4 days. 2. In the test of viable cell count, amalgam & composite resin inlay group showed cytotoxicity compared to the control & type Ⅱ casting gold group after 2 & 4 days, ranks ordered the relative cytotoxicity of the tested materials, as follows : amalgam, composite resin inlay, type Ⅱ casting gold group. 3. Amalgam and composite resin inlay group marked cytotoxicity during 2 days, but the cytotoxicity was reduced after 6 days. Type Ⅱ casting gold group showed the least cytotoxicity among the three experimental materials. 4. In the test of SDH activity by millipore filter method, amalgam and composite resin inlay group showed mild cytotoxicity.

콤포머 및 유동성 레진의 방사선불투과성에 관한 연구

문주훈,김영관,노기선 朝鮮大學校 口腔生物學硏究所 2001 口腔生物學硏究 Vol.25 No.1

This study was to determine the relative radiopacities of cavity lining materials (Compomer and Flowable resin) for posterior composite resin restoration. Compomers (Dyract, Compoglass, F2000, and Dyract flow, Compoglass F) and Flowable resins (Tetric flow, Aeliteflo, Revolution) were used for this study. Five specimens of 5㎜ in diameter and 2㎜ thick were fabricated with each material. Human molars were horizontally sectioned 2㎜ thick to include both enamel and dentin. The radiopacities of enamel, dentin, cavity lining materials, and aluminum step wedge were obtainded from conventional radiograph and NIH image program. The results were as follows : 1. All the tested lining materials showed the same levels of radiopacity as or greater than that of dentin. 2. All compomer tested (Dyract, Compoglass, F2000, Dract flow, Compoglass F) and Tetric flow were more radiopaque than enamel. 3. The radiopacities of Revolution were between enamel and dentin, and all compomer and Tetric-flow were greater than those of Revolution, Aeliteflo or dentin. Clinican should be sble to distinguish these cavity lining materials radiographically from recurrent decay, voids, gaps, or other defects that lead to clinical failure. Utilization of materials ranked more radiopaque than enamel would enable clinicans to distiguish the lining material from tooth structure.

구치부 복합레진 수복을 위한 와동 이장용 재료의 방사선투과성에 관한 연구

문주훈,최의환,Moon Joo-Hoon,Choi Eui-Rwan 대한영상치의학회 2000 Imaging Science in Dentistry Vol.30 No.4

Purpose: The aim of this study was to determine the relative radiopacities of cavity lining materials (Resin-modified Glass Ionomer cement, Compomer and Plowable resin) for posterior composite resin restoration. Material & Methods: Resin-modified glass ionomer cement (Fuji II LC, Vitrebond/sup TM/), Compomers (Dyract /sup (R)/ Compoglass, F2,000, Dyract/sup (R)/ flow Compoglass Flow) and Flowable resins (Tetric/sup (R)/ flow, Aeliteflo/sup TM/ Revolution/sup TM/) were used. Five specimens of 5 mm in diameter and 2 mm thick were fabricated with each material. Human molars were horizontally sectioned 2 mm thick to include both enamel and dentin. The radiopacities of enamel, dentin, cavity lining materials, aluminum step wedge were obtainded from conventional radiograph and NIH image program. Results: All the tested lining materials showed levels of radiopacity the same as or greater than that of dentin. All compomer tested (Dyract, Compoglass, F2,000, Dyract flow, Compoglass Flow) and Vitrebond/sup TM/, Tetric/sup (R)/ flow were more radiopaque than enamel. The radiopacities of Fuji II LC and Revolution/sup TM/ were between enamel and dentin and resin-modified glass ionomer cement, Compomer and Tetric/sup (R)/ flow were greater than those of Revolution/sup TM/, Aeliteflo/sup TM/ or dentin. The level of radiopacity of the tested materials was variable; those with low radiopacity should be avoided in class II restorations, where a clear determination of recurrent caries by the examining clinician could be compromised. Conclusion: Clinician should be able to distinguish these cavity lining materials radiographically from recurrent decay, voids, gaps, or other defects that lead to clinical failure. Utilization of materials ranked more radiopaque than enamel would enable clinicians to distinguish the lining material from tooth structure.

응축형 복합레진 수복시 유동성 레진 이장이 변연부 미세누출에 미치는 영향

문주훈,고근호 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.1

The purpose of this study was to evaluated the marginal microleakage of condensable composite resin restorations according to flowable resin lining of internal cavity wall. The eighty extracted human molar teeth without caries and/or restorations are used. The experimental teeth were randomly assigned into four groups of ten teeth each. Eighty caries-free extracted human molars were used in this study. The conventional class Ⅱ cavities (box-shaped on mesial and distal surface, faciolingual width : 3mm, gingival wall depth : 1.5mm) were prepared 1mm below comentoenamel junction with a # 701carbide bur. The teeth were divided into four groups, and then each group were subdivided into A & B group according to flowable resin & compomer lining : Group 1-A : Tetric Ceram filling. Group 1-B : Tetric Flow lining and Tetric Ceram filling, Group 2-A : Ariston pHc filling, Group 2-B : Tetric Flow lining and Ariston pHc filling, Group 3-A : SureFil filling, Group 3-B : Dyract Flow lining and SureFil filling. Group 4-A : Pyramid filling, Group 4-B : Aeliteflo lining and Pyramid filling. To simulate as closely as possible the clinical situation during retoration placement, a "restoration template" was fabricated, and the condensable resin was filled using a three-sited light-curing incremental technique. All the materials used were applied according to the manufacturers' instructions. The specimens were stored in the 100% humidity for 7 days prior to thermocycling (100 thermal cycles of 5~55℃ water with a 30-second dwell time). The specimens were immersed in 2% metyleneblue dye for 24 hours, and then embedded in transparent acrylic resin and sectioned mesiodistally with diamond wheel saw. The degree of marginal leakage was scored under stereomicroscope (x20) and the data were analyzed by Kruskal-Wallis test and Wilcoxon follows : The results were as follow : 1.In the gingival margins of all the group, microleakage of subgroup B was less than subgroup A. 2.In the group 1, 2, 4 there was significant differences between subgroup A and B (p<0.05), but in the group 3, there was not significant different between group 3-A (SureFil) and group 3-B (Dyract flow/SureFil) (p>0.05). 3.In the subgroup A and B, there was significant different between all group except group 4 of subgroup A. From the results above, it was suggested that the cavity lining of flowable resin and flowable compomer in condensable resin restoration decrease microleakage at gingival margin, and does improve their ability to seal the gingival margin of class Ⅱ preparation. Key words : Posterior composite resin restoration, Condensable composite resin, Flowable resin lining, Marginal microleakage.

치아 파절편 재부착에 관한 임상적 연구

문주훈,조영곤,박성택 朝鮮大學校 口腔生物學硏究所 1997 口腔生物學硏究 Vol.21 No.1

With the advent of the acid-etch technique, and continual improvement of resin restorative materials, reattachment of fractured tooth fragments affords the practitioner a conservative and esthetic approach to the management of anterior tooth fractures. It is possible, even when the biologic width has been invaded and the whole clinical crown is involved in the fracture, to attach the fragment to the dental remnant, with satisfactory esthetic results. It is not always mandatory to carry out the conventional from of flap surgery to restore the biologic width. The reattachment of teeth fragments through adhesive techniques, even when the fracture is severs, can be considered a safe procedure with predictable results, provided that cases are selected judiciously.

Gutta percha 충전시 도말층 유무에 따른 근관벽과의 접합도에 관한 주사전자현미경적 연구

문주훈(Joo Hoon Moon),조영곤(Young Gon Cho) 조선대학교 구강생물학연구소 1991 Oral Biology Research (Oral Biol Res) Vol.15 No.-

.