• 제목/요약/키워드: dental prosthetic

검색결과 484건 처리시간 0.029초

Effect of metal conditioner on bonding of porcelain to cobalt-chromium alloy

  • Minesaki, Yoshito;Murahara, Sadaaki;Kajihara, Yutaro;Takenouchi, Yoshihisa;Tanaka, Takuo;Suzuki, Shiro;Minami, Hiroyuki
    • The Journal of Advanced Prosthodontics
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    • 제8권1호
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    • pp.1-8
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    • 2016
  • PURPOSE. The purpose of this study was to evaluate the efficacy of two different metal conditioners for non-precious metal alloys for the bonding of porcelain to a cobalt-chromium (Co-Cr) alloy. MATERIALS AND METHODS. Disk-shaped specimens ($2.5{\times}10.0mm$) were cast with Co-Cr alloy and used as adherend materials. The bonding surfaces were polished with a 600-grid silicon carbide paper and airborne-particle abraded using $110{\mu}m$ alumina particles. Bonding specimens were fabricated by applying and firing either of the metal conditioners on the airborne-particle abraded surface, followed by firing porcelain into 5 mm in diameter and 3 mm in height. Specimens without metal conditioner were also fabricated. Shear bond strength for each group (n=8) were measured and compared (${\alpha}=.05$). Sectional view of bonding interface was observed by SEM. EDS analysis was performed to determine the chemical elements of metal conditioners and to determine the failure modes after shear test. RESULTS. There were significant differences among three groups, and two metal conditioner-applied groups showed significantly higher values compared to the non-metal conditioner group. The SEM observation of the sectional view at bonding interface revealed loose contact at porcelain-alloy surface for non-metal conditioner group, however, close contact at both alloy-metal conditioner and metal conditioner-porcelain interfaces for both metal conditioner-applied groups. All the specimens showed mixed failures. EDS analysis showed that one metal conditioner was Si-based material, and another was Ti-based material. Si-based metal conditioner showed higher bond strengths compared to the Ti-based metal conditioner, but exhibited more porous failure surface failure. CONCLUSION. Based on the results of this study, it can be stated that the application of metal conditioner is recommended for the bonding of porcelain to cobalt-chromium alloys.

Do Certain Conditions Favor the Use of Autogenous Bone Graft Over Bone Substitutes for Maxillary Sinus Augmentation?

  • Lee, Ji-Hyun;Cho, Yeong-Cheol;Sung, Iel-Yong;Choi, Jong-Ho;Son, Jang-Ho
    • Journal of Korean Dental Science
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    • 제12권2호
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    • pp.48-57
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    • 2019
  • Purpose: To investigate whether there are specific surgical or clinical conditions where the use of autogenous bone (AB) is superior to the use of bone substitutes (BSs) for maxillary sinus floor augmentation (MSFA). Materials and Methods: We retrospectively analyzed 386 implants after MSFA in 178 patients. The implants were divided into five groups according to the sinus graft material used. Risk factors for implant failure in MSFA, and correlation between residual bone height (RBH) and graft materials in terms of implant survival were investigated. To investigate risk factors for implant failure in MSFA, implant survival according to graft materials, patients' sex/age, surgical site, RBH, healing period prior to prosthetic loading, staged- or simultaneous implantation with MSFA, the crown-to-implant ratio, prosthetic type, implant diameter, and opposite dentition were evaluated. Result: The cumulative 2- and 5-year survival rates of implants placed in the grafted sinus (independent of the graft material used) were 98.7% and 97.3%, respectively. None of the investigated variables were identified as significant risk factors for implant failure. There was also no statistical significance in implant survival between graft materials. Conclusion: There were no specific surgical conditions in which AB was superior to BSs in terms of implant survival after MSFA.

인위적 정출술과 임플란트 치료를 통한 상악 전치부 보철치료 (Prosthetic restoration of the maxillary anterior teeth using implantation and forced eruption: Case report)

  • 김경규
    • 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.

노인의 구강건강상태와 체질량지수의 연관성 (Association between oral health status and body mass index in older adults)

  • 조윤영;이윤환;김진희
    • 한국치위생학회지
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    • 제16권1호
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    • pp.129-136
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    • 2016
  • Objectives: The purpose of the study is to investigate the relationship between oral health status and body mass index (BMI) in adults over 65 years old. Methods: The study subjects were 4,550 adults over 65 years old from the 5th Korea National Health and Nutrition Examination Survey(KNHANES V) in 2010-2012. Mastication-related oral health status included the number of remaining teeth, and mean number of decayed, missing, and filled permanent teeth(DMFT). Body mass index(BMI, $kg/m^2$) was categorized as underweight(<18.5), normal weight (18.5-22.9), overweight(23.0-24.9), and obese(${\geq}25.0$). Multinomial logistic regression analysis was performed to examine the association of BMI categories with the number of remaining teeth and DMFT. Results: The mean number of DMFT was highest($13.0{\pm}0.7$) in the underweight group and lowest($8.8{\pm}0.3$) in the obese group. Those having less favorable masticatory ability, and fewer number of remaining teeth and no prosthesis, tended to be underweight. Those having a higher number of remaining teeth and prosthetic teeth tended to be overweight or obese. In the multinomial logistic regression analysis, compared with those having 20 or more remaining teeth, including prosthetic teeth, those having less than 20 remaining teeth and no prosthesis had 4.48 times higher odds ratio of being underweight. DMFT was positively associated with underweight, while negatively associated with overweight or obesity. Conclusions: The masticatory ability and dental caries prevention maintained the healthy body weight in adults of old age.

Relationship of tooth mortality and implant treatment in Type 2 diabetes mellitus patients in Korean adults

  • Jung, Hyun-Yub;Kim, Yong-Gun;Jin, Myoung-Uk;Cho, Jin-Hyun;Lee, Jae-Mok
    • The Journal of Advanced Prosthodontics
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    • 제5권1호
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    • pp.51-57
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    • 2013
  • PURPOSE. The purpose of this study was to to analyze the effect of Type 2 diabetes on tooth mortality, implant treatment and prosthetic status. MATERIALS AND METHODS. 275 Type 2 diabetics and 300 non-diabetics, aged 40-80 years were selected for analysis. The assessment of number of teeth, missing teeth, fixed prostheses (bridge pontics), implants using panoramic radiographs and dental records were carried out. RESULTS. Diabetes mellitus (DM) patients had a higher number of missing teeth (P<.05) and placed implants (P=.074), age (P<.05), male gender percentage (P=.042), smoker percentage (P<.05) than non-DM patients. In univariate analysis, the patients in older group showed significantly higher number of tooth loss rate at the first dental examination than the patients in younger group. Tooth loss rate of smokers did not show higher value than that of non-smokers. When multiple variables including DM, age, smoking, gender were considered together, diabetics and older group patients showed significantly higher tooth loss rate at the first dental examination than non-diabetics and younger group patients, respectively. Smokers and male group did not show a significant difference than nonsmokers and female group, respectively. CONCLUSION. Tooth mortality and implant treatment rate were significantly higher in the DM group as indicated by univariate and multivariate logistic regression analysis. Old age groups showed significantly higher odds ratios and tooth loss rate. As diabetics showed the higher tooth loss rate than non-diabetics, diabetics also had more implant restorations than non-diabetics.

골유착성 임플랜트와 자연치의 치은연하 세균조성에 대한 비교연구 (A COMPARATIVE STUDY ON SUBGINGIVAL MICROBIAL COMPOSITION BETWEEN NATURAL TEETH AND OSSEOINTEGRATED IMPLANTS)

  • 임용식;김영수;김창회
    • 대한치과보철학회지
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    • 제31권3호
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    • pp.411-422
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    • 1993
  • Osseointegrated dental implants are now an accepted part of the prosthetic treatment of fully and partially edentulous patients. Clinical studies have shown that osseointegrated dental implants may successfully be used as abutments for prosthetic rehabilitations, and that the supporting tissue can be kept in a stable and healthy clinical state for prolonged periods of time. The purpose of this study was to look for differences in the distribution in the bacterial morphotypes around natural teeth and osseointegrated dental implants. The subgingival plaque around natural teeth and implants was analysed by means of differential phase-contrast microscopy. In addition, clinical indices used to analyse natural teeth condition were used to compare the condition of natural teeth and implants. The results were as follows : 1. In implants of partially edentulous patients, the plaque index, sulcus bleeding index(P<0.05), pocket depth(P<0.01) were greater than natural teeth. 2. Gingival crevicular fluid volume was not significantly different between natural teeth and implants. 3. In implants of fully edentulous patients, the plaque index was greater than natural teeth(P<0.01) and implants of partially edentulous patients(P<0.05), but sulcus bleeding index was not significantly different. 4. In partially edentulous patient, coccoid cell proportion was greater in implants than natural teeth (P<0.05). 5. In implants of fully edentulous patients, coccid cell proportion was even greater than implants of partially edentulous patients(P<0.05) and natural teeth(P<0.01). 6. Among three groups, the proportions of non-motile rods, motile rods, spirochetes and others were not significantly different. 7. The proportion of motile bacteria was not significantly different among three group.

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지역 보건소 구강보건실 활성화를 위한 치과위생사 역할 정립에 관한 연구 (A study on the role of dental Hygienist for revitalization of Dental Health class in Community Health Center)

  • 권현숙;조갑숙
    • 한국치위생학회지
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    • 제6권4호
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    • pp.263-282
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    • 2006
  • The purpose of study was to offer devices to activate the dental health class of community health center and to evaluate the present programs and to propose adequate guidelines for future public dental health program of dental health care in health center. For this study, the mail quastionnaire survey was carried out from the 116 dental hygienists who are working in community health center. Present condition and direction of public dental health service are as follows: dentist's office was 90% by area and work department. Dental health department was equipped in 91.7% of 'public health center', but 'health branch office' was 57.9%. Dental hygienist education condition of Public health center was the most frequency in 'At large city'. 'Have no entirely' of dental health education number of times was 35.8% in 3 years. That is 44.5% in supplement insturction. Most Dental hygienist's business was most 'teeth-sealant' and 'Old man false teeth prosthetic dentistry business'. Therefor, The Obstacle factors of dental health service activity were 'manpower tribe(average 3.92)', and next 'lack of understanding and support insufficiency of law(average 3.47)'. Curriculum for educational practice should be also designed for brightening the dental health service business. The most important thing for dental health service is 'expanding and improving the facilities Legal system' and next 'Opportunity enlargement and activation that can take dental hygienist's residency'.

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소아 치과의원의 디자인 아이덴티티 요소에 관한 연구 - 진료 영역을 중심으로 - (A Study on the Identity Design factors of Pediatric Dentistry Clinics - Focus on the Treatment Area -)

  • 김혜진;이민선
    • 한국실내디자인학회논문집
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    • 제16권1호
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    • pp.99-107
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    • 2007
  • Opening special dental office like prosthetic, orthodontics and implant is getting popular from the specialization and ramification on dental service. It shows how changes onpeople's point of view on dental offices as a business and high interesting on aesthetic. The child dental office also specialized from 1990s. It had been divided by not sort of sickness but ages of children. Thus it should support not just basic functions what other dentist of vice does but also comfortable environment to guide children patients' behavior who get afraid easily. However the interior of existing the child dental office was more focused on visual decoration but consideration of space. Thus the space is very superficial and plain, so there is limitation to give suitable environment to children patients. Therefore, from this study, I will research what is the proper space to control children patients' behavior based on well balance of space and decoration designs. Also from the research, I will explain fundamental design ideas on the child dental office space.

심미보철치료를 위한 교정치료의 원칙과 고려사항 (Principles and considerations of orthodontics for Prosthodontic treatment)

  • 장원건
    • 대한치과의사협회지
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    • 제56권9호
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    • pp.503-511
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    • 2018
  • Outcome of esthetic ceramic restorations are affected by tooth size, gingival contour, occlusal relationship, etc. For this reason, demand of orthodontic treatment before esthetic ceramic restoration is increasing. If a Bolton ratio discrepancy, a problem of the maxillary incisor's vertical position, a problem of inclination of anterior teeth, a pathogenic occlusion is existed, a pre-prosthodontic orthodontics should be accomplished. These problems can be satisfactory only after the prosthetic treatment is performed after orthodontic treatment. When orthodontic treatment is given, it should be treated with the following principle. 1. Treat it in the direction of functioning occlusion. 2. Keep the patient's stable occlusal scheme. 3. Treat the teeth by considering the average tooth size and Bolton ratio. Ortho-Prostho combined treatment with optimal treatment plan can lead a patient's function, esthetics, and long-term stability.

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치과용 타타늄-세라믹 수복시스템의 결합강도 향상을 위한 표면 코팅 (Surface Coatings to Enhance Bonding Strength of Dental Titanium-Ceramic Restorative System)

  • 이해형
    • 한국세라믹학회지
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    • 제45권10호
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    • pp.600-604
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    • 2008
  • Although titanium-ceramic systems have gained substantial interests in dental prosthetic field, bonding problem between porcelain and titanium has not been solved. Main obstacle in titanium-porcelain bonding is excessive oxidation of titanium during porcelain firing. The effects of several coating materials on the bonding strength of titanium-porcelain system were investigated in this study. RF sputtering and electroplating of platinum significantly increased the bonding strength of porcelain-titanium specimen. However, coatings of Ni-Au, Ir, and ceramics(zirconia and hydroxyapatite) did not showed a significant effect on bonding strength. Platinum might be a promising material for the protective layer of excessive oxidation of titanium during porcelain firing, resulting in increase in the bonding strength.