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Dual Survey Line을 이용한 가철성 국소의치의 설계에 대한 임상적 연구
A Clinical Study on the Removable Parial Denture Design using the Dual Survey Line

구강생물학연구 1998년 22권 2호 p.121 ~ 137

계기성, 김민정, 김정선,

소속 상세정보

계기성 (  ) - 조선대학교 치과대학 보철학교실
김민정 (  ) - 조선대학교 치과대학 보철학교실
김정선 (  ) - 조선대학교 치과대학 보철학교실

KMID : 0353319980220020121

Abstract

Surveying is an essential step in the design and construction of partial dentures. The survey line is a line drawn round the greatest girth of a tooth in relation to the common path of displacement or to the path of insertion and removal of denture. The common path of displacement of denture is at right angles to the occlusal surface, as this is the direction of the displacing forces exerted on the denture by sticky food. Clasp arms must therefore engage undercuts relative to the common path of displacement to provide retention of the denture.
The path of insertion and removal is the path along which the denture is inserted into the mouth and removed from the mouth. This path must be decided before the denture is designed.
The purpose of this study was to apply several principles of surveying so that it was necessary to understand how to position the clasps correctly in relation to the two survey lines in order to obtain optimum retention.
In this clinical study of the bilateral extension removable partial denture of mandibular class I , the removable partial denture was fabricated by using dual survey line, and then the following results were obtained.
1. The proper clasp retention could be obtained by positioning the retentive clasp tip to the common undercut below the dual survey line in relation to both the common path of displacement and the path of insertion and removal.
2. In the free end removable partial denture, giving the cast an anterior tilt reduced the possible zone of displacement. and therefore it could keep the denture from displacement in functioning.