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비고정성 연결장치의 위치에 따른 고정성 보철물의 응력분석
양홍서,Yang, Hong-So 대한치과보철학회 1996 대한치과보철학회지 Vol.34 No.1
Finite element models were constructed to analyze the mechanical behavior of a three unit fixed partial denture (FPD) with a 2nd premolar and 2nd molar abutment either employing a rigid and nonrigid connector. Gap elements were used to model the clearance space of the nonrigid connector. 1. High stress was generated in the FPD and supporting abutment around the rigid connector. 2. The pattern of stress and deflection is very similar between vertically and 20 degree mesially tilted nonrigid connector at the distal aspect of premolar abutment. 3. FPD with an inverted nonrigid connectors exhibited the worst undesirable mechanical stress states and deformations. 4. Nonrigid connector of normal orientation transmit the load to the abutment tooth, but inverted connector doesn't transmit the force.
실용적인 디지털 임플란트 치료 프로토콜 제안 : 증례보고
양홍서,박상원,임현필,윤귀덕,박찬,이도연 대한치과의사협회 2019 대한치과의사협회지 Vol.57 No.9
Recently, an advanced workflow has been introduced to finish implant surgery and prosthetic treatment in one-day. However, Because of 1. Patient`s physical condition, 2. Surgical technique, 3. Digital technical limitations, the complete completion of one-day implant treatment is practically difficult. Therefore, this paper proposes a "two-days implant digital workflow" that short-time implant surgery and restores prosthetics the next day. Even though it takes more than one day, this workflow is a realistic implant treatment protocol that can reduce the chair time in the clinic.
Pd-Ag 및 Ni-Cr 합금의 금 전착이 전장 레진의 색채에 미치는 영향
양홍서,박영준,Yang, Hong-So,Park, Yeong-Joon 대한치과보철학회 1995 대한치과보철학회지 Vol.33 No.4
As the mechanical property of composite resin improved, composite resin has been widely used esthetic dentistry. In the field of esthetic dentistry, the color of prosthetic material is very important. The purpose of this study was to evaluate the color difference of specimens, by the types of alloys and gold electrodeposit. Experimental groups were as follows : Group Prec : Au-Pt alloy with no gold coating and no resin veneer. Group Semi : Pd-Ag alloy with no gold coating and no resin veneer. Group BAse : Ni-Cr alloy with no gold coating and no resin veneer. Group Gsem : Pd-Ag alloy with no gold coating and no resin veneer. Group Gbas : Ni-Cr alloy with no gold coating and no resin veneer. Group PreR : Resin veneer on the Pd-Ag alloy without gold coating. Group SemR : Resin veneer on the Pd-Ag alloy without gold coating. Group GbsR : Resin veneer on the Ni-Cr alloy with gold coating Group BasR : Resin veneer on the Ni-Cr alloy without gold coating. In this study, colors of metal surfaces and veneered resins were evaluated by the CIE $L^{*}a^{*}b$ system. The results obtained were as follows : 1. different alloy types and gold coating make the $L^{*}a^{*}b$ system. 2. The ${\Delta}E^*$ab value between groups semi and Base was less than 1.5 and there was no $a^*$ and $b^*$ value difference between groups Gsem and Gbas 3. The values of $L^*$ and $a^*$ ain groups GsemR and GbasR were so similar that the ${\Delta}E^*$ab value was as small as 0.58. 4. In resin specimens with gold coated semiprecious or base alloys showed yellower and redder deviation than the resin specimens with precious alloy. 5. The ${\Delta}E^*$ab values between goups PreR-GsemR and groups PreR-GbasR were as small as 2.68 and 2.22 respectively.
A Two Dimensional Stress Analysis of Fixed Prosthesis with Rigid or Nonrigid Connectors
양홍서,Yang H.S.,Thomposn V.P. The Korean Academy of Prosthodonitics 1992 대한치과보철학회지 Vol.30 No.3
제 2소구치를 중간지대치로 하고 고정성 및 비고정성 연결장치를 갖는 5unit 가공의치에 의해 발생하는 역학 현상을 규명하기 위하여 이차원 유한요소 모형을 제작하였다. 비고정성 연결장치의 간극을 부여하기 위하여 gap element를 사용하였다. 연결장치의 종류나 치조골의 흡수 정도에 상관없이 모든 가공의치는 치근막 내에 발생되는 응력을 감소시키는 역할을 하였다. 그중에서 고정성 연결장치를 갖는 가공의치에서 치근막 내에 가장 작은 응력이 발생하였다. 대구치의 근심면에 비고정성 연결장치를 갖는 가공의치가 역학적 응력과 변위의 관점에서 바람직하지 않았다. A two dimensional finite element model was constructed to analyze the mechanical behavior of a five unit fred partial denture(FPD) with a 2nd premolar pier abutement either employing a rigid or nonrigid connector. Gap elements were used to model the clearance space of the nonrigid connector. All FPDs with rigid or nonrigid connectors reduced the magnitude of stress in the periodontium as compared to the control, with both normal or reduced bone support. An FPD with rigid connectors induced the smallst stresses in the periodontium. A FPD with a nonrigid connector on the mesial of the molar abutment exhibited the most undesirable mechanical stress states and deformations.
금전착이 치과용 합금과 전장 레진간의 접착 강도에 미치는 영향
양홍서,박영준,Yang, Hong-So,Park, Yeong-Joon 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.1
The purpose of this experiment was to determind whether the gold electrodeposit on Pd-Ag and Ni-Cr alloys influences on the shear bond strength between veneering resin and silicoated metal surface. All the metal specimens were sandblasted with $250{\mu}m$ aluminum oxide and followed by silicoating and resin veneering. According to the metal surfaces to be veneered, experimental groups were divided into five. Group Prec : Gold alloy without gold coating Group Semi : Pd-Ag alloy without gold coating Group Base : Ni-Cr alloy without gold coating Group Semi-G : Pd-Ag alloy with gold coating Group Base-G : Ni-Cr alloy with gold coating All specimens were thermocycled 1,000 times at temperature of $5^{\circ}C$ to $55^{\circ}C$. The effects of gold electrodeposit on the shear bond strength between resin and metal interface were measured and fractured surface of the resin veneered metal was examined under the scaning electron microscope. The following results were obtained 1. The shear bond strength between resin and metal was $64.51{\pm}11.11Kg/cm^2$ in Prec group, $62.77{\pm}11.23Kg/cm^2$ in Base group and $58.97{\pm}9.20Kg/cm^2$ in Semi Group. There was no significant difference among the groups. 2. The bond strength in groups Semi-G and Base-G decreased about 17%, compared to the nongold-electrodeposit groups(Semi, Base). 3. In groups of non electrodeposit(Prec, Semi, Base), fracture occurred at the interface between alloy and resin, while fracture interface was observed between gold coating and resin in group Semi-G, and between metal substrate and gold coating in group Base-G respectively.