하악 유리단 국소의치하에서 back-action 클래스프 설계 변화에 따른 광탄성 응력 분석
A photoelastic stress analysis on the suppoting structure in the mandibular distal extension removable partial denture with various desings of back-action clasps.
임수령, 계기성, 고영무,
소속 상세정보
임수령 ( Lim Soo-Lyoung ) - 조선대학교 치과대학 보철학교실
계기성 ( Kay Kee-Sung ) - 조선대학교 치과대학 치과보철학교실
고영무 ( Ko Yeong-Mu ) - 조선대학교 치과대학 치과재료학교실
KMID : 0353319920160010117
Abstract
The purpose of this study was to analyze the magnitude and distribution of stress using a photoelastic model from the mandibular distal extension removable partial dentures with the mesial or distal placement of the occlusal rest and the mesial
or
distal connection in the back-action clasp with the five various designs of the back-action clasp, that is, the mesial connection and the distal rest, the distal connection and mesial rest, the mesial connection and mesial rest, the distal
connection
and the mesial and distal rest, and the mesial connection, and the mesial and distal rest.
A photoelastic model was made of the epoxy resin(PC-1) and the hardner(PLH-1) with the acrylic resin teeth used and was coated with the plastic cement-1 at the lingual surface of the model and then five kinds of the removable partial dentures on
the
photoelastic model were set.
A unilateral vertical load of 12.5kg was applied on the central fossa of the first molar with the use of specially designed loading device and the pattern and distribution of the stress of the photoelastic model under each condition was analyzed
by
the
reflective circular polariscope.
@ES The following results were obtained:
@EN 1. In the back-action clasp with the mesial connection and mesial rest of the case 3, the effect of the stress distribution was the most favorable.
2. In the back-action clasp with the mesial and distal rest of the case 4 and 5, the stress distribution was more greatly showed in the terminal abutment.
3. Generally, the stress distribution was more favorable in the mesial connection than in the distal connection.
4. In the back-action clasp with the mesial connection of the case 1, 3 and 5, the stress distribution was the most favorable in the mesial rest.
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