• 제목/요약/키워드: Dental Bridge

검색결과 197건 처리시간 0.024초

교육수준에 따른 구강 보철물 상태 비교 연구 (Study on Comparison of Dental Prosthesis Condition according by Educational Level)

  • 김혜연;이미희;김지혜
    • 한국산학기술학회논문지
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    • 제18권2호
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    • pp.123-129
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    • 2017
  • 본 연구는 국민건강영양조사 제6기 원시자료 중 구강 검진조사로 이루어진 구강보철물 상태 조사를 활용하였다. 만 19세 이상 성인을 대상으로 교육수준별로 실제 구강건강 상태가 어떠한지를 보고자, 구강 내 현존하는 보철물 상태와 가공의치, 틀니 등의 필요도를 비교 분석하였다. 연구결과로 인구사회학적 특성에서 여자가 남자에 비해 교육수준이 초등졸업 이하가 32.2%로 현저히 낮았고, 연령대가 증가할수록 교육수준이 점점 낮아졌으며, 통계적으로 유의한 차이를 보였다. 소득수준에서는 대학 졸업이상이 소득수준 '상'에 45.3%로 가장 높게 나타났고, 대학 졸업이상의 교육수준에서 전문가 직업군이 77.4%로 월등히 높았으며 통계적으로 유의한 차이를 보였다. 교육수준에 따른 상 하악의 구강 내 보철물 상태에서는 초등학교 졸업 이하의 수준에서 전체적으로 구강내 보철물이 가장 많이 존재하고 있었고, 부분틀니. 완전틀니 필요도에서도 초졸 이하의 교육수준에서 가장 높았으며, 통계적으로 유의한 차이를 보였다. 고정성 가공의치 필요단위 수에서는 상악에서는 초등학교 졸업이하의 교육수준에서 가장 높았지만, 하악에서는 중학교 졸업 수준에서 가장 높았고, 유의미한 차이를 보였다.

임프란트를 이용한 고정성 계속가공의치의 FRAMEWORK 형태에 관한 연구 (A SUTDY ABOUT THE SHAPE OF THE FRAMEWORK OF THE FIXED BONE ANCHORED BRIDGE USING DENIAL IMPLANTS)

  • 김태균;이영수;유광희
    • 대한치과보철학회지
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    • 제36권1호
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    • pp.104-119
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    • 1998
  • The purpose of this study was pertinent design of the framework of the fixed bone anchored bridge using implants in the edentulous mandible through analysis of stress distribution by the three dimensional finite element analysis method. The results were as follows: 1. The L-shaped framework was favorable in restoring the edentulous mandible by implants and fixed bone anchored bridge. 2. The structure of the framework should be designed to endure the occlusal load because of stress concentration at the most distal abutment of the framework. 3. The stress at the distal implant where cantilever starts was twice as much as that of other portions. 4. Compressive stress was generated on the framework of the mesial side of the distal implant and extrusive force was induced to the mesially positioned implants. 5. The height of vertical plate was high as possible as can be to distribute stresses concentrating bucco-lingually and labio-lingually in the framework between abutments, 6. Reinforcement of the horizontal plate thickness was needed because stress was loaded more on the horizontal plate than on the vertical plate of the framework. 7. Lengthening of the vertical plate can compensate for any limitations in horizontal plate width.

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Knitted Glass Fabric 강화 복합레진을 사용한 고정성 치과보철물에 대한 적용성 평가 (A FEASIBILITY STUDY ON THE APPLICATION OF THE KNITTED GLASS FABRIC COMPOSITES TO FIXED PROSTHODONTIC RESTORATION IN DENTISTRY)

  • 정재민;이규복;조광헌
    • 대한치과보철학회지
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    • 제40권5호
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    • pp.429-440
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    • 2002
  • Current dental restorations present a relatively weak resistance to fracture. Owing to their unique mechanical properties, fibre-reinforced polymers are now being considered. Unidirectional or woven continuous fibres, made of glass, polyethylene, carbon or Kevlar, have been evaluated. This study focused on the use of glass fibre knitted fabrics to reinforce acrylate resins, in order to investigate the possibility to construct single crowns as well as three unit bridges. Some points affecting the final composite system were tested ; 1) static strength, with focus on the stress transfer under a occlusal contact point ; 2) modelling of a three nit bridge ; 3) fatigue strength as a posterior three unit bridge material. The study demonstrated that knitted fabric reinforcements are showing an interesting compromise between stiffness, static strength for single crown. For three unit bridge applications in the posterior arch, however knitted glass fabric reinforcements were not strong enough in fatigue An additional reinforcement in the posterior arch fixed partial denture design was recommended.

치과기공실(齒科技工室)의 작업공정별(作業工程別) 소음(騷音)에 관한 연구(硏究) (A Study on the Noise by working Process in Dental Laboratory)

  • 남상용
    • 대한치과기공학회지
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    • 제15권1호
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    • pp.27-41
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    • 1993
  • Degree of noise by personal dental laboratory working process and degree of noise by complex dental laboratory working process were measured separtely. The time of exposure to noise greater than 70dB was analyzed. Then, the whole degree of noise in dental laboratory was estimated on the basis of afore-mentioned information. Questionaire were employed to investigate the mental, emotional and physiological effects of noise in dental technicians, The purpose of this study was to provide basic information on keeping dental techneicans who are exposed to noise pollution in good working condition and good health. Results obtained are as follows ; 1. Polishing process in each working part showed high degree of noise greater than 70dB in terms of degree of noise by personal working. 2. Degree of noise by complex working process in each working part was greater than that of personal working process. 3. Time of exposure to noise complex working process the part of porcelain 150min, partial denture 120 min, crown and bridge 100 min, full denture 80 min. 4. Degree of noise by time in dental laboratory was 80dB in general for polishing process and below 75dB for waxing process. 5. Effects of noise on mental and emotional state of dental technicians showed that they felt irritated every day(14%), irritated once in a while(29%) and easily ger mad(19%). 6. Effects of noise on heart and stomach were hyper-gastric acid(38%), gastric ulcer(11%), gastritis(5%), deuodenal ulcer(3%) and weak heart function(32%). 7. Effects of noise in the hearing ability were weak(39%), moderate(33%) and normal(14%) Data presented in this study demonstrated that noise in the dental laboratory exerts profound effect on dental technicians mentally, physiologically and emotionally, in light of the above results, therefore, it appears advisable to devots substantial on the management of working condition and put further(continuing) efforts in the investigation for reducing noise problem.

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대체 신기법을 적용한 구치부 교의치 pontic ridge lap 제작방법 (Applying the New Technology for Making Pontic Ridge Lap in Posterior Bridge Restoration)

  • 김욱태
    • 구강회복응용과학지
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    • 제29권3호
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    • pp.308-316
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    • 2013
  • 구강점막의 건강을 지속적으로 유지, 보지 및 치간유두를 보존시켜 치간공극의 발생을 최소화하고, 심미적이며, 발음에도 이상이 없는 최종보철물을 제작과정에서 교의치 pontic base 하방에 염증의 발생을 방지하고, self-cleasing이 될 수 있는 구치부 교의치 pontic ridge lap 제작방법을 연구하였다. 교의치 pontic base 하방에 염증의 발생을 방지하고, self-cleasing이 될 수 있는 제작기술을 부산, 경남지역의 치과 10군데를 대상으로 적용하였다. 구치부 3unit 교의치 pontic base를 제작할 때 대체 신기법을 적용한 ridge lap 형성방법을 제시하고, 임상검증을 수행하기 위해 기존의 통상적인 방법으로 제작된 것과 대체 신기법을 적용한 것을 비교분석 하였다. 염증, 기타 치주질환은 기존의 통상적인 방법으로 제작한 pontic base에서 9.6%, 대체 신기법을 적용한 방법으로 제작된 것은 0.3%이 나타났다. 음식물 잔류에서는 통상적인 방법은 100%, 대체 신기법을 적용한 방법 9.1%으로 유이한 차이를 보여지만, 가글 후의 검사 결과는 대체 신기법을 적용한 방법이 0.8%로 낮은 결과를 얻었다. 그리고 self-cleasing면에서 통상적인 방법으로 제작한 pontic base에서 9.0%, 대체 신기법을 적용한 방법 0.8%으로 나타났다.

상실된 영구 중절치의 교정적 치료와 심미적 수복 치험례 (TREATMENT OF MISSING CENTRAL INCISORS USING SPACE REGAINING AND MARYLAND BRIDGE : CASE REPORT)

  • 전상언;김용기
    • 대한소아치과학회지
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    • 제21권2호
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    • pp.611-616
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    • 1994
  • A major cause of missing permanent incisors is congenital abscence and extraction because of trauma and pathologic condition. The request for restoration of missing or spaced anterior teeth is common in dental practice. Problems, such as the tilting, drifting, and rotation of teeth adjacent to the space, complicate the restoration of apperance, and a normally simple restorative dental procedure may become difficult. There are two primary treatment alternatives to improving a dentition's irregular and spaced apperance-closing the space by orthodontic means or providing a prosthesis to disguise the space. The treatment choice depends on many variables, but, as a general rule, patients with a normal overbite, overjet, and buccal relationship are better treated by maintaining the sapce and providing a prosthesis, either fixed or removable. This case report presents two cases : Traumatic loss of maxillary right and left central incisors, Extraction of malformed mandibular right central inciosr. The loss of central incisor space was regained by the fixed-removable and fixed orthodontic appliance, and then Maryland bridge was cemented.

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Relationship between squamous cell carcinoma of the tongue and the position of dental prosthesis

  • Fan, Huan;Yoon, Ki-Yong;Kim, Soung-Min;Myoung, Hoon;Lee, Jong-Ho;Kim, Myung-Jin
    • The Journal of Advanced Prosthodontics
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    • 제7권2호
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    • pp.129-137
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    • 2015
  • PURPOSE. Squamous cell carcinoma (SCC) of the tongue has a relatively high incidence of all oral cancers. Some studies have reported a relationship between intraoral dental prosthesis and SCC of the tongue; however, this relationship remains controversial. The purpose of this study was to investigate the relationship between SCC of the tongue and the positional aspects of dental prosthesis using a retrospective analysis. MATERIALS AND METHODS. A total of 439 patients with SCC of the tongue were diagnosed and treated in the Department of Oral and Maxillofacial Surgery, Seoul National University Dental Hospital. Patients were treated over a 12.5-year period ranging from January 1, 2001 to June 30, 2013. Statistical analysis was performed to examine potential differences between the groups. RESULTS. The number of patients with a crown and/or a bridge (134, 63.5%) was significantly different than the number of patients without a prosthesis (77, 36.5%). Even after accounting for different types of prostheses such as crowns, bridges, and dentures, no significant differences were observed between the position of the prosthesis and the location of the SCC of the tongue, with significance defined as a P-value less than .05 by the Pearson-Chi square test. CONCLUSION. Patients with crowns and/or bridges exhibited more frequent SCC of the tongue compared with patients without these prosthesis. These data support the hypothesis that mechanical trauma and galvanic phenomena play a role in the etiology of SCC of the tongue.

부산지역(釜山地域) 개업치과(開業齒科)의 치과보철물(齒科補綴物)에 관(關)한 만족도(滿足度) 조사(調査)(I) - 일부정식 치과 보철물에 관하여 - (A Study on Satisfaction of Practicing Dentists about Prosthesis in Pusan Part I : About Fixed Prosthetic appliances)

  • 이명곤
    • 대한치과기공학회지
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    • 제10권1호
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    • pp.159-169
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    • 1988
  • Fixed prosthetic appliance is the restorations of damaged teeth with cast metal or porcelain, and of replacing missing teeth with fixed, or cemented prosthesis. Successfully treating a patient by means of fixed prosthodontics requires the thoughtful combination of dentist and dental laboratory technician. In order to know the satisfaction of dentisits about fixed prosthetic appliances-porcelain, precious and non precious metal-, this study was conducted for 69 practicing dentisis in Pusan during Fed. to Mar. 1988 using a questionnaire method and was analyzed by the use of percentage, $X^2$-test The results are obtained as follow: 1. General characteristics of the respondents, The rate of age distribution of practcing dentists responded was as follow : 31$\sim$35 age group is 29.0%, 51$\sim$55age group 18.8%, 41$\sim$45 age group and 46$\sim$50 group each 11.6%, 36$\sim$40 age group and 56$\sim$60 age group 8.7%, over 60 age group 7.3%, below 30 age group 4.3% respectively. The tate of term of practice experience distribution of dentists responded was as follow : 6$\sim$10 year group 26.1%, 25$\sim$25year group 18.8%, 11$\sim$15 years group and 16~20 years group each 13.0%, below 5 years group and over 30 years group each 10.2%, 26$\sim$30 years group 8.7% in order. The rate of respondents’ degree was follow : bachelor group 81.2%, doctor group 13.0%, master group 5.8% in order. The rate of respondents’completed medical specialist course was as follow : non-complete group 75.4%, complete group 24.6%. The rate of having own laboratory in respondents’clinic was as follow : no having own laboratory group 58.0%, having own labiratory group 42.0% The rate of being lab. technician in respondent;s clinic was as follow: non-being lab. technician group 91.3%, being lab. technician group 8.7%. The rate of transactional commercial dental lab. numbers was as follow : I dental lab. group 40.6%, 2 dental lab. group 30.4%, 3 dental lab. group 20.3%, production at own lab. group 8.7% 2. Cognitions about the respondent's job, About cognition of patient numvers, there were neither many nor few group 62.3%, few group 17.4%, many group 15.9%, too many group 4.4% in order.(P<.01) As compared with the ratio of dentists to patient prothetic treatment, there were moderate level group 46.4%, high level group 33.6%, low level group 18.8% in order.(P<.01) By job satisfaction of respondents, the highest percentage group was satisfied group 44.9%, neither astisfied nor disstified group 33.3%, dissatisfied group 14.5%, much satisfied group 7.3%(P<.01). As compared with the level of prosthetics price, the were moderate level group 71.0%, low level group 23.2%, high level group 5.8%(P<.01) 3. Satisfaction and assessment of dissatisfied factor of the fixed prosthetic appliance, As compared with the satisfaction of al prosthetic appliance, there were neither satisfied nor dissatisfied group 59.4%, satisfied group 20.3% dissatisfied group 18.8%, much satisfied group 1.5% in order.(P<.01). About precious and non precious metal crown and bridge, there were neither satisfied nor dissatisfied group 60.9%, satisfied group 24.6%, dissatisfied group 11.6%, much satisfied group 2.9% in order.(P<.01) The reat of respondent;s satisfaction about porcelain crown and bridge was as follow : neither satisfied nor dissatisfied group 43.5%, dissatisfied group 33.3%, satisfied group 21.7%, much satisfied group 1.5%(P<.01). The rate of respondent's dissatisfied factor item of precious and non precious metal crown and bridge was as follow : inadequate margin fit item 39.1% respondent, inadequate occlusion item 24.6%, inadequate adaptation item 23.2%, poor anat omic form item 15.9%, inadequate contact item 31.9%, improper polishing item 4.4%, the rest item 11.6% respectively. The rate of respondent's dissatisfied factor item of porcelain crown and bridge was as follow : inadequate margin fit item 52.2%, inadequate occlusion item 2.9%, inadequate adaptation item 10.1%, poor anatomic form item 11.6%, improper polishing item 1.5%, shade mismatching item 71%, the rest item 7.2% respectively. The rate of cognition of respondents’ about cause of dissatisfied factor on fixed prosthetic appliance by item was as follow : deficiency of sincerity item 55.1%, deficiency of knowledge about work item 47.8%, deficiency of experience item 15.9%, poor quality of using material item 5.8%, the rest item 2.9% respectively.

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치관보철물(齒冠補綴物) 제작(製作)에 사용(使用)되는 Nickel-Chromium계(系) 합금(合金)의 치경부(齒頸部) 변록(邊綠)에 관(關)한 적합성(適合性) (The Margin Fit of Nickel-Chromium Metal Alloys used for the Production of Crown and Bridge Prosthetics)

  • 이인규;최운재
    • 대한치과기공학회지
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    • 제13권1호
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    • pp.9-13
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    • 1991
  • The purpose of this study was to determine the marginal fit of recasting by used nickel-chromium metal alloys, Hi-Crown, New-Crown and CB-80. Ninety crown prosthetics were divided into eighteen groups according to new to old metal ratios. Each crown was seated on its master die and then the marginal gaps were measured under optical microscope($\times$50). All groups were showed good marginal fit, except group 3 of Hi-Crown(156$\mu$m). The results suggest that the marginal fit of Ni-Cr metal alloy casting bodies were good as without concerned to mixed ratios and metals.

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Effects of Microbial Communication on The Growth of Periodontopathogens

  • Lee, Chung-Koo;Baek, Dong-Heon
    • International Journal of Oral Biology
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    • 제35권4호
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    • pp.197-202
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    • 2010
  • Most oral microorganisms exist as biofilms which initiate formation via the attachment of an early colonizer to host proteins on the tooth surface. Fusobacterium nucleatum act as a bridge between early and late colonizers. Dental biofilms eventually comprise dental pathogens such as Porphyromonas gingivalis, Treponema denticola and Tannerella forsythia. To evaluate the effects of mutual interactions between oral bacteria on the growth of biofilms, periodontopathogens were co-cultured with a $0.4\;{\mu}m$ barrier. Streptococcus gordonii inhibited the growth of F. nucleatum and periodontopathogens. However, F. nucleatum, P. gingivalis and T. denticola activated the growth of other bacteria. A co-culture system of early and late colonizers could be a useful tool to further understand bacterial interactions during the development of dental biofilm.