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KMID : 0362419960340030415
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Journal of Korean Academy of Prosthodontics
1996 Volume.34 No. 3 p.415 ~ p.430
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A photoelastic stress anlysis in the surrounding tissues of teeth seated by indirect retainers when applied sidlodiging forces on unilateral distral extention partialldentures
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Son Jee-Young
Lee Cheong-Hee
Jo Kwang-Hun
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Abstract
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The purpose of this study was to evaluate the stress distributions in the surrounding tissues of the teeth seated by indirect retainers in three different teeth of unilateral distal extension partial denture when the dislodging forces were
applied on denture bases. Three dimensional photoelastic models were made. The teeth on which indirect retainers were seated were mandibular left lateral incisor (Model I), canine (Model II), and first premolar (Model III). The dislodging force with 860gm at 45°angulation to occlusal plane was applied to each model. Three dimensional photoelastic stress analysis was done, and the records were diagramed and analysed. @ES The results were as follows : @EN The compressive stresses were shown the most on neck portions of buccal, mesial, and distal sides in all three models. Slight tensile stresses were shown on neck portions of lingual sides in all three models. The compressive stresses on buccal side were shown in strength in such order as model I, model II, and model III. The compressive stresses were shown on neck portion of mesial and distal sides of model I and mode II, with model I more than Model II. The compressive stresses were shown only on neck portion of mesial side on Model III. The general overall magnitude of compressive stresses were shown in strength in such order as Model I, Model II, and Model III.
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KEYWORD
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