Stress Analysis of Complete Veneered Castable Glass Ceramics Crown. Three-Dimensional Photoelastic Stress Analysis.

DOI Web Site 26 References
  • Minami Hiroyuki
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School
  • Onizuka Tadashi
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School
  • Nakashima Atsuo
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School
  • Yamabe Seiji
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School
  • Nakashima Yuka
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School
  • Nomura Kensuke
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School
  • Minesaki Yoshito
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School
  • Jimi Tadashi
    The 1st Department of Prosthetic Dentistry, Kagoshima University Dental School

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Other Title
  • フルベイクタイプのキャスタブル・ガラス・セラミックス―ポーセレン・ジャケット・クラウンの荷重時の応力解析　三次元光弾性実験による応力解析
  • Three-Dimensional Photoelastic Stress Analysis
  • 三次元光弾性実験による応力解析

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Abstract

The purpose of this study was to investigate the stress distribution of all-ceramic crowns made of castable glass ceramics coping with and completely veneered by dental porcelain, using three-dimensional photoelastic stress analysis technique under a static load. Two-layered photoelastic models were made of epoxy resin. Four different loading sites were chosen, and stress was frozen.<BR>The results obtained in each model were as follows:<BR>1. Severe stress was observed in the vicinity of loading sites, and there was a strong possibility of fracture.<BR>2. Relatively low tensile stress was observed at the incisal half of the labial surface and around the cingulum of the lingual surface.<BR>3. Relatively high compressive stress was observed around the labial and lingual cervixes. This is considered to be mesiodistal tensile stress, and may be related to cervical semicircular fracture, with tensile stress around the cingulum.<BR>4. Danger of fracture from the internal surface was suggested.<BR>5. Compressive and tensile stresses tended to decrease in areas away from loading sites, compared to the partially veneered type, and superiority of complete veneered type was indicated.

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