• 대한소아치과학회지
• /
• 제25권1호
• /
• pp.47-61
• /
• 1998

The purpose of this study was to compare the microleakage pattern of glass ionomer with resin restoration in microleakage pattern of primary and permanent teeth. Microscopical observation of interface between tooth structure and restoration was also performed. 80 and 8 sound molar teeth were used for the microleakage test and SEM study respectively. Data were analyzed statistically using ANOVA test and/or t-Test. The results of the present study were as follows: 1. According to the result of microleakage pattern between primary and permanent tooth, primary tooth generally showed more micro leakage than permanent tooth in all groups (p<.05). 2. In the resin-filled groups, occlusal margin was shown to have more microleakage than gingival margin(p<.05). Whereas the glass ionomer-filled groups showed no statistically significant differences between them(p>.05). 3. No statistically significant differences in microleakage could be found between two different resin groups(p>.05), while Fuji II LC group showed less microleakage than Ketac-Fil group(p>.05). 4. The various type hybrid layer was evident under SEM in resin-filled groups both in primary and permanent teeth with generally thicker layer in primary group. Among glass-ionomer group, Fuji II LC group showed more intact adhesion to tooth surface than Ketac-Fil group

• Restorative Dentistry and Endodontics
• /
• 제21권2호
• /
• pp.489-504
• /
• 1996

The purpose of this study was to compare the adaptation to the tooth structure of five light cured glass ionomer cements (Fuji II LC. VariGlass VLC, Vitremer, Dyract and Geristore). Human, non-carious fifty extracted permanent premolars stored in normal saline were used. Class V cavity preparations were created on the buccal surfaces. The occlusal margin of each cavity was placed on the enamel and the gingival margin was placed on the cementum/dentin. The teeth were then distributed at random into five groups of 10 teeth each. Group 1: Fuji II LC, Group 2 : VariGlass VLC, Group 3 : Vitremer, Group 4: Dyract, Group 5 : Geristore. The prepared cavities were restored with one of the five light cured glass ionomer cements. The manipulation of each material was handled according to the manufacturer's instructions. All samples were placed in incubator of 100% relative humidity at $37^{\circ}C$ for 24 hours. The roots of the teeth were removed with the tapered fissure bur and the remaining crowns were sectioned buccolingually through the center of restorations. The cut interfaces were gradually hand polished on sandpapers from 300 up to 1200 grit. The adaptation at the tooth/cements interface was assessed by SEM (JSM-840A, JEOL Ltd.). The results of this study were as follows : 1. Group 2 revealed the best adaptation and groups 1, 4 and 5 revealed similar adaptation pattern to the cavity walls. Group 3 revealed the worst adaptation to the cavity walls. 2. Enamel margins showed better adaptation than dentin/cementum margins with each material except group 3. 3. The hybrid layers were observed between the glass ionomer cement and dentin in groups 2, 4 and 5.

• Restorative Dentistry and Endodontics
• /
• 제47권2호
• /
• pp.15.1-15.18
• /
• 2022

This review aimed to characterize the effect of direct restorative material types and adhesive protocols on marginal adaptation and the bond strength of the interface between the material and the proximal dentin/cementum. An electronic search of 3 databases (the National Library of Medicine [MEDLINE/PubMed], Scopus, and ScienceDirect) was conducted. Studies were included if they evaluated marginal adaptation or bond strength tests for proximal restorations under the cementoenamel junction. Only 16 studies met the inclusion criteria and were included in this review. These studies presented a high degree of heterogeneity in terms of the materials used and the methodologies and evaluation criteria of each test; therefore, only a descriptive analysis could be conducted. The included studies were individually evaluated for the risk of bias following predetermined criteria. To summarize the results of the included studies, the type of restorative material affected the test results, whereas the use of different adhesive protocols had an insignificant effect on the results. It could be concluded that various categories of resin-based composites could be a suitable choice for clinicians to elevate proximal dentin/cementum margins, rather than the open sandwich technique with resin-modified glass ionomers. Despite challenges in bonding to proximal dentin/cementum margins, different adhesive protocols provided comparable outcomes.

• Restorative Dentistry and Endodontics
• /
• 제19권2호
• /
• pp.473-484
• /
• 1994

To investigate the effect of resin cement, which had been known to increase the adhesive capacity of the cast gold inlay, on the gingival marginal fit and whether the tin-planting of the beveled area affects the marginal fit, Class II cast gold inlays were made on the 25 sound molars. Control group(ZPC goup) was cemented with the ZPC by conventional method. Experimental groups were cemented with the resin cement(Super-hond & $Panavia_{EX}$) and subdivided further by the existence or nonexistence of the tin-plating of the beveled area(ST & PT groups: with plating, SNT & PNT groups: without plating). So, each group was consisted of 5 teeth and the gingival margin of each specimen was mesiodistally sectioned by 3 times and the marginal and internal gap were evaluated by the Stereo Microscope (${\times}180$) and the Scanning Electron Micrascope(${\times}5,000$) was used for examining the adhesive relationship of the resin cement to the cavity wall and to the cast gold surface. The results were as follows : 1. Marginal gap was less than internal gap in all groups. 2. ZPC and SNT(bevel without tin-plating) groups showed the least gap and gap in PNT(bevel without tin-plating) group, ST(bevel with tin-plating) group, PT(bevel with tin-plating) group showed the greater value in order in evaluation of the both internal gap and marginal gap. 3. With the exception of the relationships between ZPC and SNT groups, ST and PNT groups, relationships between any other groups showed the statistical significance in the internal gap(p<0.05). 4. In the marginal gap, all relationships between groups showed the statistical significance (p<0.05) except the relationships between ZPC and SNT groups, ST and PNT groups, ZPC and PNT groups. 5. ZPC group showed more soluble phenamena than the resin groups(ST, SNT, PT, PNT). 6. Resin cement showed the void spaces in spite of good penetration into the micro-irregularities on both the tooth surface and the cast surface. The void was shown more in PT and PNT groups than in the ST and SNT groups. 7. After the treatment of heat and desiccation for SEM specimen, resin cements were detached more easily from the tooth surface than from the cast surface.

• Journal of Periodontal and Implant Science
• /
• 제30권3호
• /
• pp.651-661
• /
• 2000

A mucogingival grafting procedure has been developed to cover denuded root surface. The subepithelial connective tissue graft technique is very predictable and allows for a good esthetic results and minimum patient discomfort on the palate. However, in areas where there is a lack of vestibular depth and keratinized attached tissue, the presence of frena or heavy muscle attachment, covering the connective tissue graft with a mucosal flap is very difficult. The purpose of this study is to evaluate an alternative technique of root coverage using the free connective tissue graft. The results were as follows: 1. Probing depths didn't seem to vary significantly from the preoperative to postoperative period. 2. The amount of keratinized tissue showed an increase of $5.9{\pm}0.97mm$ from the preoperative level. 3. Total clinical exposed root coverage increase 72.2% compare with preoperative level. 4. The shrinkage from gingival margin is $4.2{\pm}1.15mm$ and the mean shrinkage rate is 40.1%. 5. The depth of the vestibule increased with the average distance from cementoenamel junction to mucogingival junction being $7.4{\pm}1.65mm$.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
• /
• 제26권4호
• /
• pp.369-372
• /
• 2000

The purpose of this study was to investigate the distribution pattern of CGRP immunoreactive nerve fibers in the healing mucosa of extracion wound. Maxillary 1st molars of rats were extracted. All extraction sites and adjacent tissues of 3 groups of rats(1-week, 2-week and 4-week groups) were removed en bloc and processed for immunostaining and were subjected to light microscopic examination. The results obtained were as follows; In 1-week group, there was no difference in the distribution pattern of CGRP immunoreactive nerve fiber between epithelial margin adjacent to extraction socket and normal gingival epithelium. In 2-week group, some CGRP-immunoreactive nerve fibers were seen in epithelial layer. In 4-week group, many intercellular CGRP immunoreactive nerve fibers were abundant in all layers of immature epithelium characterized by scab on the mucosa and thick keratinized cell layer with irregular surface. Intraepithelial CGRP immunoreactive nerve fibers were reduced to normal level in adjacent mature epithelium. These results suggest that density of CGRP immunoreactive nerve fibers are increased transiently in epithelium during reepithelialization process and CGRP released from these nerve fibers may play an important role in the reepithelialization in the wound healing.

• Journal of Periodontal and Implant Science
• /
• 제26권1호
• /
• pp.309-316
• /
• 1996

Squamous cell carcinoma is the most common malignant tumor of the gingiva. Oral cancer accounts for 5 percent of all malignant tumors in the body, and 6 percent of these occur in the gingiva. We present one case of squamous cell carcinoma of the gingiva in 23-year-old female. She complained of gingival swelling and pain during mastication between left maxillary first molar and second molar. Since she had received scaling 2 years ago, food impaction occurred frequently in this site and an ulcerative lesion recurred several times. When she was referred from local clinic, she had a large, irregularly ulcerated lesion of palatal gingiva between left maxillary first molar and second molar, accompanying induration in center and slight elevation around ulcerative margin. The etiology could not be defined but we could diagnose by careful history taking and excisional biopsy of the recurrent ulcerative lesion. In addition, computed tomography and nuclear medicine imaging were undertaken. As a result, we finally diagnosed as moderately differentiated squamous cell carcinoma without metastases. It is concluded that if ulcerations do not respond to therapy in the usual manner, it should be biopsed and histologically evaluated for the definitive diagnosis and treatment.

• Journal of Periodontal and Implant Science
• /
• 제36권4호
• /
• pp.901-911
• /
• 2006

Maxillary palatal mucosa is the most frequently used donor site of the soft tissue for periodontal plastic surgery. In our study, thickness of the palatal mucosa between the mesial side of the maxillary first premolars and the distal side of the maxillary first molars was measured with a periodontal probe and an ultrasonic device in 30 young Korean adults. Using the data, the possibility of the clinical application of ultrasonic devices was evaluated. The results of this study were as follow; 1. The thickness of the palatal mucosa of the maxillary premolars is the thickest and that of the mid-palatal portion of the maxillary first molar is the thinnest. 2. The thickness of the palatal mucosal tissue increases from the gingival margin to the mid-palatal suture. 3. The measurements of the periodontal probe and the ultrasonic device revealed the strong positive correlations.

• 대한치과보철학회지
• /
• 제30권3호
• /
• pp.437-443
• /
• 1992

This study was performed to investigate the availability of adhesive resin cement for luting agent of cast crown. The resin cements used in this study were Panavia-Ex(Kuraray Co., Japan) and C & B-Metabond (Parkell Bio-Materials U.S.A.). Zinc phosphate cement was Flecks zinc cement(Mizzy Inc., U.S.A.) The film thickness of cast crown at gingival margin, lateral wall and occlusal surface was observed with measuring microscope(Modek MXT 70 Matsuzawa Seiki Co., Japan) and the retention of cast crown was measured with Instron Universal Test Machine (Instron Engineering Co., U.S.A.) The results were as follows : 1. The value of retention of cast crown was the highest in the use of Panavia-EX, followed by C & B-Metabond and 2inc phosphate cement, respectively. 2. There was no difference in film thickness among the three cements, but the film thickness in all cements was highest at occlusal surface.

• Restorative Dentistry and Endodontics
• /
• 제32권5호
• /
• pp.437-444
• /
• 2007

이 연구는 거친 입자와 미세한 입자의 다이아몬드 포인트로 형성한 5급 와동에서 서로 다른 2단계 접착시스템 사용시 법랑질과 상아질 변연에서의 미세누출 차이를 상호 비교하기 위하여 시행하였다. 40개의 발거한 대구치의 협면 치경부에 각각 $106-205\;{\mu}m$의 거친 다이아몬드 포인트 (EX-41)와 $53-63\;{\mu}m$의 미세한 다이아몬드 포인트 (TF-21F)를 이용하여 20개씩 5급 와동을 형성한 후 사용된 접착시스템과 복합레진에 따라 다음과 같이 4개의 군으로 분류하였다; 1군은 EX-41 포인트로 형성한 와동에 Single Bond와 Z 250을 사용한 군, 2군은 TF-21F 포인트로 형성한 와동에 Single Bond와 Z 250을 사용한 군, 3군은 EX-41 포인트로 형성한 와동에 Clearfil SE Bond와 Clearfil AP-X를 사용한 군, 4군은 TF-21F 포인트로 형성한 와동에 Clearfil SE Bond와 Clearfil AP-X를 사용한 군으로 분류하였다. 각 군은 $5^{\circ}C$와 $55^{\circ}C$의 증류수에서 500회 열 순환한 후 2% methylene blue용액에 1일 동안 침적하였다. 각 군의 치아를 협설로 절단하여 광학 입체현미경 하에서 법랑질과 상아질 변연에서의 색소침투 정도를 관찰하여 미세누출 점수를 평가하고, 각 군 간의 유의성을 검정하여 다음과 같은 결과를 얻었다. 이 연구를 종합하면, 5급 와동에서 Single Bond는 이 연구에 사용한 다이아몬드 포인트의 종류에 따른 변연 미세누출 차이를 보이지 않았으나 Clearfil SE Bond는 거친 다이아몬드 포인트 보다는 미세한 다이아몬드 포인트를 사용하는 것이 법랑질과 상아질 변연 모두에서 낮은 미세누출을 보였다.