• 제목/요약/키워드: veneers

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Porcelain Laminate Veneers

  • 김영성
    • 대한치과의사협회지
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    • 제27권8호통권243호
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    • pp.747-762
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    • 1989
  • Enamal은 인간의 몸중에서 가장 단단한 조직이다. 이것은 치관을 덮고 있으며 Dentin을 보호한다. 치아의 색깔은 Dentin을 덮고있는 enamel의 두께에 의해 결정된다. 절단면은 Dentin이 없기 때문에 gray-white이며 치경부는 Dentin을 덮고 있는 enamel의 두께가 얇기 때문에 Yellow-white이다. 이러한 면에서 볼때 치관의 색깔은 Dentin이 투과성이 있는 enamel을 통과해서 나오는 색깔과 enamel자체의 색깔이 혼합되어서 만들어 진다고 할 수 있다. 현재 미형적(esthetic)으로 사용되고 있는 PFM은 이러한점을 완전히 만족시킬 수 없다. 잘 선택된 경우에 이러한 측면에서 SHADE를 완전히 만족시킬 수 있는 보철물이 있다. 바로 Porleain laminate veneer이다.

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Effect of pMDI or HDI Content in UMF Resin on Bonding High Moisture Content Veneers

  • Xu, Guang-Zhu;Eom, Young-Geun;Lee, Byoung-Ho;Kim, Hyun-Joong
    • Journal of the Korean Wood Science and Technology
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    • 제38권5호
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    • pp.414-420
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    • 2010
  • The effect of polymeric diphenyl methane-4,4-diisocyanate (pMDI) or 1,6-hexamethylene diisocyanate (HDI) in the UMF resin was discussed for improvement of the dry and wet shear strengths of plywood manufactured from high moisture content veneers. The curing behavior of UMF resin by pMDI or HDI content was examined by DSC and TGA, and its adhesion performance was evaluated by dry and wet shear strength tests of plywood. With the increase of pMDI content in the UMF resin, the curing temperature, reaction enthalpy (${\Delta}H$), and thermal stability consistently increased. With the increase of HDI content in the UMF resin, however, the curing temperature and reaction enthalpy (${\Delta}H$) decreased consistently and the thermal stability slightly increased in the range of 200 to $400^{\circ}C$ but decreased beyond $400^{\circ}C$. Also, the dry tensile shear strength increased up to the pMDI content of 5% and then decreased with its further addition but the wet tensile shear strength showed slight tendency to increase with the increase of pMDI content in the UMF resin. As the HDI content increased, however, the dry and wet tensile shear strengths of plywood consistently increased.

적층가공방식을 이용한 열가압 세라믹 라미네이트 비니어의 적합도: 3차원 분석 (Fitness of heat - pressed ceramic laminate veneer using additive manufacturing process: 3 Dimensional analysis)

  • 강신영;이하나;김어빈;이경은;김지환;김웅철
    • 대한치과기공학회지
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    • 제39권3호
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    • pp.137-143
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    • 2017
  • Purpose: The purpose of this study is to analyze the fitness of heat - pressed ceramic laminate veneers fabricated using the additive manufacturing. Methods: Impression was replicated by using light body silicone and heavy body silicone on the custom tray, and it was fabricated using Type IV Stone. The test specimens were prepared by using a dental scanner, a laminating veneer using a dental design program, and a specimen with a 3D printer. The control specimens were prepared by the lost wax technique and heat - pressed to fabricate the specimens. The data of the specimens were measured by the RMS value of the internal fitness a using a 3-dimensional measurement program. Results: The Stereolithography laminate veneer group was measured at $78.10(4.09){\mu}m$ and the LWV group was measured at $31.50(5.10){\mu}m$. There is a significant difference between the two groups (p<0.001) Conclusion : Evaluation of fitness laminate veneers was fabricated by additive manufacturing showed the difference statistically significantly and clinically acceptable result.

치과의사와 함께 꼭 들어야 할 6전치 라미네이트 이야기 (Story of the anterior veneers which surely have to listen with a dentist)

  • 박형랑
    • 대한심미치과학회지
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    • 제23권1호
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    • pp.41-54
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    • 2014
  • 심미란 단어가 우리에게 친숙한지 20여년이 흐른 지금도 새로운 것에 도전하듯이 어려움을 가져다주는 것은 아마도 진화라기보다는 기본적인 로드맵이 안 되어 있어서 아직도 서툴고 회피하는 것은 아닌지 싶다. 보철마다 특성상 장점과 단점이 있는 것이기에 그 적응증을 숙지하고 그에 맞는 진단과 적절한 선처치가 될 때 기대할만한 결과를 얻을 것이다. 이 과정에 환자에 대한 정보공유와 치과의사와 치과기공사간의 소통과 전문화된 각자의 역할은 매우 중요한 치료과정이며 이 통로를 얼마큼 잘 제도화 시켰느냐가 심미기공물의 성패가 달려 있다고 보아도 과언 이 아닐 것이다. 위의 서술한 치료과정의 바탕으로 가장 장점이 많고 보존적의미가 있는 라미네이트 심미보철에 관해 살펴보고자 한다.

System Development for Providing Optimal Friction Force for Sorting Machine

  • Lee, Jeong-Wook;Lee, Woon-Sung;Kim, Jung-Ha
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 2003년도 ICCAS
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    • pp.2555-2559
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    • 2003
  • In this study, we develop an automatic sorting system, which is mostly affected by frictional forces between a veneer and friction-generating device. So we will make a suitable dynamic model and mechanism to control friction force using a AC servo-motor. We suggest Stick friction and Column friction model, which is occurred between roller and veneer and within veneers as well. A kind of sensor can get the velocity of roller and movement of roller vertical direction. We assume that the several things to simplify the complicate and difficult nonlinear friction phenomenon. And to create an optimal normal force, which can generate a suitable friction force, we control the movement of sorting roller and supporter as well. We introduce several results about a friction character and suggest the value of calibration of sorting roller movement and supporters as well.

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One Piece Casting법에 의한 Fixed Bridge (A CASE REPORT FOR CONSTRUCTION OF FIXED BRIDGE BY ONE PIECE CASTING TECHNIQUES)

  • 김인철;김광남
    • 대한치과의사협회지
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    • 제10권12호
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    • pp.809-812
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    • 1972
  • This present paper is concerned with four unit fixed bridge construction by one piece casting technique in the case of missing of upper left second premolar and first molar. The authors had good clinical results with following advantages. 1. The complete bridge can be delivered to the patient for two appointments. 2. The laboratory procedures for solder joint are not necessary. 3. A one piece casting can be properly shaped without weak joints. 4. The casting can be heat-treated to insure an ideal molecular structure. 5. Porcelain veneers can be applied without weakening or melting solder joints.

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Ceramic veneers without tooth reduction: A clinical report

  • Lee, Wonsup;Kwon, Ho-Beom
    • 대한치과의사협회지
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    • 제54권5호
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    • pp.342-347
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    • 2016
  • This clinical report presents conservative and esthetic ceramic veneer treatments without tooth reduction. Patients' benefit from avoiding invasive procedure is discussed in terms of biologic price. The margin is placed not only at the cervical area, but also at any place on the tooth where additive volume increase is required. Techniques to camouflage the margin is described where contact lens effect is difficult to achieve. Proper case selection would be imperative to avoid periodontally hazardous restoration.

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응력파 실험에 의해 예측된 단판으로 제작한 할열과 목리를 지닌 3매 단판적층재의 특성 (Properties of 3-layered Laminated Veneer Lumber with Crack and Grain Angle from Stress Wave Tested Veneers)

  • 차재경
    • Journal of the Korean Wood Science and Technology
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    • 제18권3호
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    • pp.17-25
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    • 1990
  • 양표면은 무결점재를, 가운데 단판은 경사목리 및 목리방향의 할열을 가진 단판을 사용하여 제조한 3매 단판 적충재에 있어서 목리방향과 할열의 인장탄성계수 및 인장강도에 미치는 영향에 대하여 조사하였다. 또한, 비파괴 시험 방법인 응력파 실험에 의하여 각단판의 탄성계수를 측정하고, 이들 단판의 탄성계수로부터 단판적층재의 탄성계수를 예측하여 실측치와 비교하였다. 응력파에 의해 예측된 탄성계수는 인장실험으로부터 얻어진 결과와 거의 일치하였으며 인장탄성계수와 인장강도간에도 높은 상관관계를 나타내었다($r^2$=0.681). 인장강도에 있어서는 가운데 단판 할열의 영향은 나타나지 않았으나 목리의 경우 경사각이 증가함에 따라 인장강도가 감소하는 경향을 나타내었다.

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천공공법을 이용한 다목적 경량 합판의 신뢰성 평가 (Credibility Evaluation of Versatile Weight Lightening Plywood Using Piercing)

  • 김진우;김혜수;김창욱;송정일
    • 한국기계가공학회지
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    • 제12권4호
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    • pp.55-60
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    • 2013
  • In this study, mechanical properties of versatile light weight plywood(manufacturing using piercing) are studied. A credibility evaluation was carried out for different perforation patterns including octagonal shape, rectangular shape and circular shape. A static structural analysis is conducted to find the stresses produced. Circular perforations are found to have better strength to weight ratio. Results of each type of perforation are discusses and compared.

도재 라미네이트 비니어를 이용한 상악 전치부의 심미적 수복 (Esthetic restoration of upper anterior teeth by porcelain laminate veneer)

  • 오상천;신영호
    • 구강회복응용과학지
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    • 제19권1호
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    • pp.35-41
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    • 2003
  • With the understanding of tooth crown biomechanics and the progress of dentin adhesives, bonded porcelain restorations including a porcelain laminate veneer present an extended spectrum of indications for anterior teeth. Porcelain laminate veneer as a restoration offers the conservative solution that balances the functional and esthetic needs of the anterior dentition. Porcelain's stiffness, its surface characteristics, and the biomechanical strength achieved through bonding to tooth surface enable the restoration of the tooth as a whole supporting occlusal force and masticatory function. Namely, the optical effects inherent in the tooth and the lifelike features of the porcelain make that this restoration approaches the ultimate in esthetic satisfaction for both the dentist and the patient. A 49-year-old female patient with the incisal discoloration of upper central incisors and black triangle between the central incisors was referred to correct her esthetic problems with prosthodontic approach. The patient was satisfied with two porcelain laminate veneers that were made according to prof. Magne and Belser's recommendation.