• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2001년도 춘계학술대회
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• pp.258-258
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• 2001

Fiber-reinforced materials have highly favorable mechanical properties. and their strength-to-weight ratios are superior to those of most alloys. When compared to metals they offer many other advantages as well. including non-corrosiveness. translucency. good bonding properties. and ease ofrepair. Fiber-reinforced materials can be categorized to pre-impregnated. impregnation required. dental laboratory products. chairside products and prefabricated posts. so it is not suprising that fiber-reinforced composites have potential for use in many applications in dentistry. Fiber-reinforced materials can be utilized in frameworks for crowns. anterior or posterior fixed prostheses. chairs ide tooth replacements. periodontal splints. customized posts. prefabricated posts. orthodontic retention. denture reinforcements and in implants dentistry. To realize the full potential of using fiber-reinforced composite restorations. it is essential that the clinician and laboratory technician understand concepts of tooth preparation and framework design. Also practitioner may appreciate the background information and other details about the materials themselves so that identify the rationale for their use in various clinical situations. select well-suited materials. and carry out related procedures. Understanding the material properties and take many attentions. fiber-reinforced materials will give more esthetic. more easy. more strong and more reliable restorations.ations.

• 구강회복응용과학지
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• 제36권2호
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• pp.128-137
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• 2020

지난 30년동안, CAD/CAM 시스템을 이용한 수복 시스템은 눈부시게 발전하였다. 구치부 수복에서 널리 쓰이던 것과는 달리, 환자와 임상가의 심미적인 요구를 충족해야 하는 전치부 수복 증례에서는 CAD/CAM 시스템을 이용하는데 다소 한계가 있었다. 단일 색조를 가지는 CAD/CAM 수복물에 다양한 색조를 부여하기 위해, A2 lithium disilicate (LS2) 블록에 staining kit를 이용하여 색조 개별화를 시행하여 다양한 색조를 표현하는 예비실험을 시행하였다. 색조 개별화를 진행한 시편을 spectrophotometer를 이용하여 CIE L^*a^*b^* 값을 측정한 후, 임상에서 널리 사용되고 있는 shade guide와 비교하였다. 예비 실험 결과를 바탕으로 2명의 환자의 전치부 수복시, 치아의 부위별 색조 재현과 표면 특성의 개별화를 진행한 증례를 소개한다. 수복물의 해부학적 형태는 CAD/CAM 시스템에서 '복사 및 붙여넣기 기능'과 '거울상 획득 기능'을 이용하여 디자인하였으며, 이 연구에서 소개하는 모든 임상 및 수복물의 기공과정은 진료실 내에서만 이루어졌다.

• 대한치과보철학회지
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• 제43권2호
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• pp.176-190
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• 2005

Statement of problem. The current trend in prosthodontics is the adoption of a conservative approach to preparing dental prostheses by minimizing the amount of sound tooth structure removal during preparation. Purpose. The major disadvantage of the adhesion bridge is the inherently poor resistance to dislodgement that its use in areas subjected to high occlusal load is limited. The purpose of this study was to compare the dislodgement resistance of $Bio-pin^{(R)}$, conventional 3-unit and adhesion bridges. Material and methods. The experimental groups were classified as follows : Group I : 3-unit bridge cemented using $Super-Bond^{(R)}$ C&B Group II : Adhesion bridge cemented using $Super-Bond^{(R)}$ C&B Group III : $Bio-pin^{(R)}$ design adhesion bridge without incorporation of $Bio-pin^{(R)}$ (cemented using $Super-Bond^{(R)}$ C&B) Group IV-1 : $Bio-pin^{(R)}$ retained adhesion bridge incorporating a single $Bio-pin^{(R)}$ (cemented using $Super-Bond^{(R)}$ C&B) Group IV-2 : $Bio-pin^{(R)}$ retained adhesion bridge incorporating a single $Bio-pin^{(R)}$ (cemented using $Panavia^{(R)}$ F) Group V : $Bio-pin^{(R)}$ retained adhesion bridge incorporating two $Bio-pins^{(R)}$ (cemented using $Super-Bond^{(R)}$ C&B) Results. The results of this study were as follows : 1. Significant differences in dislodgement resistance of the restorations were found between Group I, Group II and Group III (p<0.05). No significant differences in dislodgement resistance of the restorations were observed between Group I Group IV-1 and Group V. However, there were significant differences in dislodgement resistance between Group II and the other groups (p<0.05). 2. No significant differences in dislodgement resistance of the restorations were observed between GroupIV-1 and GroupIV-2, both of which utilized a single $Bio-pin^{(R)}$. However, significant differences were observed when Group III was compared to either GroupIV-1 or Group V (p<0.05). 3. No significant differences in dislodgement resistance relative to the type of dental cements used were found. Conclusion. From the above results, it is concluded that the dislodgement resistance of $Bio-pin^{(R)}$ bridge restorations utilizing a single $Bio-pin^{(R)}$ is similar to that of a conventional 3-unit bridge. The results also suggest that $Bio-pin^{(R)}$ bridge restorations using a single $Bio-pin^{(R)}$ are a viable alternative to the conventional 3-unit bridge when minimal removal of sound tooth structure and fulfillment of both function and esthetic aspects are considered.

• 대한치과의사협회지
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• 제22권8호통권183호
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• pp.667-670
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• 1984

보철물이 제기능을 발휘하기 위해서는 건강한 치주조직이 필요할 분 아니라, 보철물 그 자체가 건강한 치주조직을 계속적으로 유지시켜 줄 수 있어야 한다. 보철물이 치주질환을 야기하거나, 치주질환을 가진 지대치에 아무런 처치없이 보철물을 장착한다면 결국 치아의 상실을 초래하게 된다. 이런 일로 인하여 외국에서는 치과이사와 환자가 소송에까지 이르게 되는 불행한 에가 많다. 이런 예는 먼 나라의 이야기가 아니라, 우리 나라에서도 문제가 되어가고 있는 것 같다. 필자의 조사(미 발표)에 의하면, 보철물이 치주조직에 미치는 영향에 관하여 재 조명이 있어야 될것으로 생각한다.

• The Journal of Advanced Prosthodontics
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• 제13권4호
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• pp.268-268
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• 2021

• The Journal of Advanced Prosthodontics
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• 제12권3호
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• pp.173-180
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• 2020

PURPOSE. This study compared digital (reference point matching) and replica methods for measuring marginal and internal fit of full coverage restorations. MATERIALS AND METHODS. A maxillary left first molar typodent was fixed on to an aluminum base and prepared to receive all-ceramic full coverage restoration. The model was scanned with an intraoral scanner (CEREC Omnicam, Sirona, York, PA, USA). Twelve crowns were fabricated from lithium disilicate blocks (IPS emax CAD, Ivoclar Vivadent) and then crystalized. Marginal and internal fit of each restoration was measured by two examiners using replica and a new digital three-dimensional technique. Reliability between the two methods and two examiners was assessed by correlation and Cronbach's Alpha coefficient (P<.05). A Bland-Altman assessment for agreement was used to compare the two methods. RESULTS. Bland-Altman assessment showed that the mean of difference for marginal, absolute marginal, and axial gap was respectively -1.04 ㎛, -41.9 ㎛, and -29.53 ㎛ with limit of agreement (LOA) between -37.26 to 35.18 ㎛ for marginal, -105.85 to 22.05 ㎛ for absolute marginal and -80.52 to 22.02 ㎛ for axial gap. Positive correlation for repeatability (P<.05) in determining marginal and internal gaps by the two examiners in both techniques was revealed. Reliability of both techniques in all sites of measurements was at least good (0.8 ≤ α < 0.9). CONCLUSION. Both measuring techniques appeared highly reliable for evaluating fit of fixed dental restorations, while reference point matching provided higher values in axial and absolute marginal gap assessment.

• 대한치과보철학회지
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• 제49권1호
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• pp.80-86
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• 2011

임플란트 인접치아가 심한 치아우식이나 파절 등으로 인해 치관부의 잔존 치질이 손상된 경우 인위적 맹출술을 이용한 치관연장술은 임플란트와 인접한 치조골과 치간 유두의 보존으로 심미적인 보철 치료를 가능하게 한다. 54세 남자 환자분이 상악 전치부 고정성 보철물의 탈락으로 새로운 보철 치료를 주소로 내원하셨다. 상악 우측 중절치는 경도의 치아우식만 보였고 상악 우측 견치는 치관부 치질이 대부분 소실되어 있었다. 상악 우측 측절치의 결손부는 골 이식을 동반한 임플란트 식립을 시행하였고, 상악 우측 견치는 1달간 인위적 맹출술을 통한 치관연장술을 시행하였다. 임플란트 식립 5개월 후 2차 수술을 시행하였고, 임시치아의 단계적 수정을 통한 치은 성형 후 상악 우측 중절치, 상악 우측 측절치, 상악 우측 견치 각각 금속-도재관으로 수복하여 만족할 만한 임상결과를 얻을 수 있었다.

• 구강회복응용과학지
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• 제32권3호
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• pp.224-231
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• 2016

과도한 치아의 마모는 치아의 병적 변화, 교합 불균형, 기능 및 심미적 문제를 일으키며 악관절과 근육의 문제를 일으킬 수 있는 수직고경의 감소를 야기할 수도 있다. 수직고경의 감소가 발생한 경우, 전악보철수복을 통해 수직고경을 회복시켜 주기 위해서는 정확한 진단이 중요하다. 본 증례는 59세 남성으로 전반적인 치아의 마모와 파절로 인한 수직고경의 감소 및 비심미성을 해결하기 위해 전악 지르코니아 보철 수복을 시행하였다. 생리적 안정위, 견치간 거리 등을 분석하여 수직고경을 3 mm 거상하기로 하였고 전악 왁스업 후 임시치관을 제작하여 6개월동안 사용한 뒤 이를 이용하여 지르코니아 최종 보철을 완성하였다. 1년 6개월 경과 관찰하여 만족스러운 결과를 얻었기에 보고하는 바이다.

• 치위생과학회지
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• 제21권4호
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• pp.251-259
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• 2021

Background: The purpose of this study was to investigate the effects of commercially available calamansi soju and other alcoholic beverages on the microhardness and erosion of resin restorations. Methods: In this study, we evaluated the effects of Calamansi soju, Chamisul fresh, Cass fresh, and Gancia Moscato D'asti on resin restorations. Jeju Samdasoo and Coca-Cola were used as negative and positive controls, respectively. Specimens to be immersed in the beverages were manufactured using composite resin according to the product instructions. In each group, the surface microhardness was measured using a surface microhardness instrument before and after immersion for 5, 15, 30, and 60 minutes. The pattern of change in the surface of the composite resin was observed under a scanning electron microscope (SEM). Paired t-tests, one-way ANOVA, and repeated measures ANOVA were performed to compare the surface microhardness of the specimens, and the Tukey test was used as a post hoc test. Results: The pH of all beverages except Jeju Samdasoo was <5.5, which is the critical pH that can induce erosion. The difference in surface microhardness of the composite resin before and after immersion for 60 minutes was significant in all groups. In particular, the largest change in surface microhardness was observed in the calamansi soju group. In the SEM analysis, loss of composite resin was observed in all groups except the Jeju Samdasoo group, and rough surfaces with pores of various sizes were observed. Conclusion: In this study, all beverages except Jeju Samdasoo decreased the microhardness of the composite resin surface, and it was confirmed that calamansi soju had the greatest change.

• The Journal of Advanced Prosthodontics
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• 제13권6호
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• pp.373-384
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• 2021

PURPOSE. This study aimed to compare the marginal and internal fit of 3-unit monolithic zirconia restorations that were designed by using the data obtained with the aid of intraoral and laboratory scanners. MATERIALS AND METHODS. For the fabrication of 3-unit monolithic zirconia restorations using impressions taken from the maxillary master cast, plaster cast was created and scanned in laboratory scanners (InEos X5 and D900L). The main cast was also scanned with different intraoral scanners (Omnicam [OMNI], Primescan [PS], Trios 3 [T3], Trios 4 [T4]) (n = 12 per group). Zirconia fixed partial dentures were virtually designed, produced from presintered block, and subsequently sintered. Marginal and internal discrepancy values (in ㎛) were measured by using silicone replica method under stereomicroscope. Data were statistically analyzed by using 1-way ANOVA and Kruskal Wallis tests (P<.05). RESULTS. In terms of marginal adaptation, the measurements on the canine tooth indicated better performance with intraoral scanners than those in laboratory scanners, but there was no difference among intraoral scanners (P<.05). In the premolar tooth, PS had the lowest marginal (86.9 ± 19.2 ㎛) and axial (92.4 ± 14.8 ㎛), and T4 had the lowest axio-occlusal (89.4 ± 15.6 ㎛) and occlusal (89.1 ± 13.9 ㎛) discrepancy value. In both canine and premolar teeth, the D900L was found to be the most marginally and internally inconsistent scanner. CONCLUSION. Within the limits of the study, marginal and internal discrepancy values were generally lower in intraoral scanners than in laboratory scanners. Marginal discrepancy values of scanners were clinically acceptable (< 120 ㎛), except D900L.