의치장착자의 구취발생에 관한 연구

권택가,장경수,Kweon, Taeg-Ga,Jang, Kyung-Soo 대한턱관절교합학회 2001 구강회복응용과학지 Vol.19 No.2

In order to investigate the amount of oral malodor of denture wearers, concentration of volatile sulfur compounds of 20 denture wearers(10 male, 10 female) was measured by Halimeter(RH-17, Interscan, CA, USA) at following four conditions ; condition 1(with denture) : male - $415.0{\pm}90.1$, female - $430.9{\pm}101.3$ condition 2(immediately after denture removal) : male - $291.4{\pm}35.5$, female - $259.8{\pm}20.4$ condition 3(with denture after 30 minutes immersing in chlorhexidine) :male - $210.1{\pm}25.7$, 여자 - $197.4{\pm}22.2$ condition 4(with denture after 24 hours immersing in chlorhexidine) : male - $120.1{\pm}35.2$, 여자 - $109.2{\pm}20.0$ There was no sexual difference, but, value at the condition 1 showed statistically significant difference from the others(p<0.05). It is dentists' responsibility and privilege to understand and diagnose the strong association between mouth and oral malodor and treat it.

골유착 재현 레진 모델에서 골 상태 및 임플란트 형태에 따른 임플란트 안정성에 관한 연구

권택가,여인성,김성훈,한중석,이재봉,양재호,Kwon, Taek-Ka,Yeo, In-Sung,Kim, Sung-Hun,Han, Jung-Suk,Lee, Jai-Bong,Yang, Jae-Ho 대한치과보철학회 2011 대한치과보철학회지 Vol.49 No.2

연구 목적: 자기공명주파수 분석, 페리오테스트, 풀림 토크는 임플란트의 안정성을 측정하기 위한 방법으로 알려져 있다. 이 방법들은 골 상태와 임플란트 형태에 영향을 받는다. 본 연구에서는 골유착이 재현된 아크릴 레진 실험 모델에서 임플란트가 결합된 골의 양을 변화하고 경부의 골 상실양이 증가하였을 경우, 자기공명주파수 분석, 페리오테스트, 풀림 토크 측정에 어떠한 영향을 주는지 알아보고 이들 상호간의 관계를 알아보고자 하였다. 연구 재료 및 방법: 골 유착을 재현하기 위하여 임플란트를 알루미늄 틀에 나사로 고정한 후 자가중합형 아크릴릭 레진의 가루와 용액을 틀 안에 부어서 중합을 시켰다. 임플란트와 결합된 레진의 두께를 조정하여 골 결합 두께를 각각 1, 3, 5, 10 mm인 경우로 재현하였다. 그 후 임플란트 주변 경부 골 상실 양이 1, 3, 5 mm인 경우를 재현하였다. 각각의 재현된 골 조건에서는 4 mm 직경의 직선형 임플란트, 같은 직경의 tapered 형 임플란트, 5 mm 직경의 tapered 형의 3가지 임플란트가 각각 5개씩 사용되었다. 모든 골 조건에서 자기공명주파수 분석과 페리오테스트 측정이 이루어졌으며 골 결합 두께 1, 3 mm 시편에서는 풀림 토크가 측정되었다. 결과: 골 결합 두께가 증가하거나 임플란트 직경이 증가할수록 통계적으로 유의하게 ISQ 값은 증가하였고, 페리오테스트 값은 감소하였다 (P<.001, P<.001). 임플란트 경부에 주위 골 상실 양이 커질수록 ISQ 값은 감소하였고, 페리오테스트 값은 증가하였다 (P<.001). ISQ 값과 페리오테스트 t값은 매우 강한 상관관계를 나타냈다 (r = -0.99, P<.001). ISQ값과 풀림토크는 약한 상관관계를 나타냈으며 (r = 0.52, P<.001), 페리오테스트 값과 풀림 토크도 약한 상관관계를 나타냈다 (r = -0.52, P<.001). 결론: 레진으로 재현한 골의 양이 증가할수록, 임플란트의 직경이 증가할수록, 경부의 골 상실양이 적을수록 임플란트 안정성이 증가함을 확인할 수 있었다. 또한 본 연구에서는 ISQ 값과 페리오테스트 값의 강한 상관관계를 밝힐 수 있었다. Purpose: Resonance frequency analysis, Periotest, and removal torque (RT) test were known as the methods to assess implant stability. The results of these methods are affected by the bone condition, implant diameter and shape. The purpose of this study is to access the meaning and the correlationship of the resonance frequency analysis, Periotest and RT test in osseointegration simulated acrylic resin when the engaged bone thickness and peri-implant bone defect are changed. Materials and methods: To simulate osseointegration, the fixture was fixed to an aluminum mold with a screw. Acrylic resin powder and liquid were poured into the mold for polymerization. The engaged resin thickness with implant was controlled. Simulated cortical bone thicknesses were 1, 3, 5 and 10 mm. Additional 1, 3 and 5 mm peri-implant bone defects were simulated. Three types of implants were used; 4 mm diameter implants of straight shape, 4 mm diameter implants of tapered shape and 5 mm diameter implants of tapered shape. Five fixtures per each type were tested in respective bone condition. Resonance frequency analysis and Periotest were evaluated in all bone conditions. Peak removal torque was measured at simulated cortical bone thicknesses of 1 and 3 mm. The statistical analysis was performed with the Kruskal-Wallis test, Mann-Whitney U test, and Spearman test using a 95% level of confidence. Results: With increasing engaged bone depth, the Implant Stability Quotient (ISQ) values increased and the Periotest values (PTVs) decreased (P<.001, P<.001). With increasing peri-implant bone defect, ISQ values decreased and PTVs increased (P<.001). When the diameter of implant increased, ISQ values increased and Periotest values (PTV) decreased (P<.001). There was a strong correlation between ISQ values and PTVs (r = -0.99, P<.001). Furthermore, the peak removal torque values had weak correlations with both ISQ values and PTVs (r = 0.52, P<.001 ; r = -0.52, P<.001). Conclusion: This study confirmed favorable implant stability with increasing engaged bone depth and implant diameter and decreasing peri-implant bone defect. ISQ values and PTVs showed strong correlation with each other and not with the peak removal torque values.

Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns

권택가,백현순,양재호,한중석,이재봉,김성훈,여인성 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.2

PURPOSE. All-ceramic crowns are subject to fracture during function. To minimize this common clinical complication, zirconium oxide has been used as the framework for all-ceramic crowns. The aim of this study was to compare the fracture strengths of two computer-aided design/computer-aided manufacturing (CAD/CAM) zirconia crown systems: Lava and Digident. MATERIALS AND METHODS. Twenty Lava CAD/CAM zirconia crowns and twenty Digident CAD/CAM zirconia crowns were fabricated. A metal die was also duplicated from the original prepared tooth for fracture testing. A universal testing machine was used to determine the fracture strength of the crowns. RESULTS. The mean fracture strengths were as follows: 54.9 ± 15.6 N for the Lava CAD/CAM zirconia crowns and 87.0 ± 16.0 N for the Digident CAD/CAM zirconia crowns. The difference between the mean fracture strengths of the Lava and Digident crowns was statistically significant (P<.001). Lava CAD/CAM zirconia crowns showed a complete fracture of both the veneering porcelain and the core whereas the Digident CAD/CAM zirconia crowns showed fracture only of the veneering porcelain. CONCLUSION. The fracture strengths of CAD/CAM zirconia crowns differ depending on the compatibility of the core material and the veneering porcelain.

Maxillary Sinus의 inferior wall의 피질골 두께가 임플란트의 초기안정성에 미치는 영향에 대한 in vitro 연구

권택가,강봉서,김석규,양성은,이철원 대한통합치과학회 2013 대한통합치과학회지 Vol.2 No.2

rimary stability of dental implant is a very important factor of dental implant success. However, few data are available for comparing the primary stability characteristics of less 10mm cancellous and cortical bone thickness. The purpose of this study were to measure the primary implant stability according to sinus inferior wall's cortical bone thickness. Swine bones which have 6,8 and 10 mm bone height and 1 mm and 1.5 mm cortical bone thickness were selected as an experimental model. As treated specimens one side cortical bone was removed. The assemblies were divided into groups of each 30 swine bone specimens according to implant diameter (4.3D group: 4.3mm, 4.8D group: 4.8mm),total bone height (6H group: 6.0mm, 8H group: 8.0mm, 10H group: 10.0mm),and cortical bone thickness (1C: 1.0 mm, 1.5C: 1.5 mm). Implant stability as a function of resonance frequency analysis, peak insertion torque were recorded for each fixture site after placement and removal. The RFA values of 1.5C group was significantly higher than that of 1C group (p < 0.05). The peak insertion torque of 1.5C group was significantly higher than that of 1C group (p < 0.05). Within the limits of this study, thickness of cortical bone have some influences on the primary stability of implants.

의치장착자의 구취발생에 관한 연구

권택가(Taeg-Ga Kweon),장경수(Kyung-Soo Jang) 대한턱관절교합학회 2001 구강회복응용과학지 Vol.17 No.2

In vivo comparison between the effects of chemically modified hydrophilic and anodically oxidized titanium surfaces on initial bone healing

이효정,권택가,김성균,여인성,양일형 대한치주과학회 2015 Journal of Periodontal & Implant Science Vol.45 No.3

Purpose: The aim of this study was to investigate the combined effects of physical and chemical surface factors on in vivo bone responses by comparing chemically modified hydrophilic sandblasted, large-grit, acid-etched (modSLA) and anodically oxidized hydrophobic implant surfaces. Methods: Five modSLA implants and five anodized implants were inserted into the tibiae of five New Zealand white rabbits (one implant for each tibia). The characteristics of each surface were determined using field emission scanning electron microscopy, energy dispersive spectroscopy, and confocal laser scanning microscopy before the installation. The experimental animals were sacrificed after 1 week of healing and histologic slides were prepared from the implant-tibial bone blocks removed from the animals. Histomorphometric analyses were performed on the light microscopic images, and bone-to-implant contact (BIC) and bone area (BA) ratios were measured. Nonparametric comparison tests were applied to find any significant differences (P<0.05) between the modSLA and anodized surfaces. Results: The roughness of the anodized surface was 1.22±0.17 μm in Sa, which was within the optimal range of 1.0-2.0 μm for a bone response. The modSLA surface was significantly rougher at 2.53±0.07 μm in Sa. However, the modSLA implant had significantly higher BIC than the anodized implant (P=0.02). Furthermore, BA ratios did not significantly differ between the two implants, although the anodized implant had a higher mean value of BA (P>0.05). Conclusions: Within the limitations of this study, the hydrophilicity of the modSLA surface may have a stronger effect on in vivo bone healing than optimal surface roughness and surface chemistry of the anodized surface.

Marginal fit of anterior 3-unit fixed partial zirconia restorations using different CAD/CAM systems

송태진,권택가,양재호,한중석,이재봉,김성훈,여인성 대한치과보철학회 2013 The Journal of Advanced Prosthodontics Vol.5 No.3

PURPOSE. Few studies have investigated the marginal accuracy of 3-unit zirconia fixed partial dentures (FPDs) fabricated by computer-aided design/computer-aided manufacturing (CAD/CAM) system. The purpose of this study was to compare the marginal fit of zirconia FPDs made using two CAD/CAM systems with that of metalceramic FPDs. MATERIALS AND METHODS. Artificial resin maxillary central and lateral incisors were prepared for 3-unit FPDs and fixed in yellow stone. This model was duplicated to epoxy resin die. On the resin die, 15 three-unit FPDs were fabricated per group (45 in total): Group A, zirconia 3-unit FPDs made with the Everest system; Group B, zirconia 3-unit FPDs made with the Lava system; and Group C, metal-ceramic 3-unit FPDs. They were cemented to resin dies with resin cement. After removal of pontic, each retainer was separated and observed under a microscope (Presize 440C). Marginal gaps of experimental groups were analyzed using oneway ANOVA and Duncan test. RESULTS. Mean marginal gaps of 3-unit FPDs were 60.46 μm for the Everest group, 78.71 μm for the Lava group, and 81.32 μm for the metal-ceramic group. The Everest group demonstrated significantly smaller marginal gap than the Lava and the metal-ceramic groups (P<.05). The marginal gap did not significantly differ between the Lava and the metal-ceramic groups (P>.05). CONCLUSION. The marginal gaps of anterior 3-unit zirconia FPD differed according to CAD/CAM systems, but still fell within clinically acceptable ranges compared with conventional metal-ceramic restoration.

The reliability of an easy measuring method for abutment convergence angle with a computer-aided design (CAD) system

Yong-Joon Seo,권택가,한중석,이재봉,김성훈,여인성 대한치과보철학회 2014 The Journal of Advanced Prosthodontics Vol.6 No.3

PURPOSE. The purpose of this study was to evaluate the intra-rater reliability and inter-rater reliability of three different methods using a drawing protractor, a digital protractor after tracing, and a CAD system. MATERIALS AND METHODS. Twenty-four artificial abutments that had been prepared by dental students were used in this study. Three dental students measured the convergence angles by each method three times. Bland-Altman plots were applied to examine the overall reliability by comparing the traditional tracing method with a new method using the CAD system. Intraclass Correlation Coefficients (ICC) evaluated intra-rater reliability and inter-rater reliability. RESULTS. All three methods exhibited high intra-rater and inter-rater reliability (ICC>0.80, P<.05). Measurements with the CAD system showed the highest intra-rater reliability. In addition, it showed improved inter-rater reliability compared with the traditional tracing methods. CONCLUSION. Based on the results of this study, the CAD system may be an easy and reliable tool for measuring the abutment convergence angle.