title: Photoelastic stress analysis of endodontically treated teeth restored with different post systems: normal and alveolar bone resorption cases.
abstract: The present study examined the influence of different post materials and their lengths on the mechanical stress of endodontically treated incisor roots in two alveolar bone conditions. Two-dimensional photoelastic models were fabricated to simulate the endodontically treated maxillary central incisors restored with three kinds of posts materials (low Young's modulus glass fiber post, high Young's modulus glass fiber post, and prefabricated stainless steel post) and two post lengths (8 and 4 mm). Completed models were placed in a transmission polariscope and loaded with a static force of 150 N at 45° to the tooth axis. Photoelastic photographs and the magnitudes of fringe order revealed stress distribution in the root, and suggest that the glass fiber post with a low Young's modulus and long length can reduce the stress concentration both in normal and alveolar bone resorption conditions.
authors: Fixed Prosthodontics, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University.
authors: Jinbao
authors: J
authors: Ma
authors: Hiroyuki
authors: H
authors: Miura
authors: Daizo
authors: D
authors: Okada
authors: Koichiro
authors: K
authors: Yusa
mesh_terms: D016301:Alveolar Bone Loss / Q000628:therapy; D003188:Composite Resins / Q000627:therapeutic use*; D003722:Dental Alloys / Q000627:therapeutic use*; D003764:Dental Materials / Q000627:therapeutic use*; D017267:Dental Prosthesis Design; D003799:Dental Stress Analysis; D055119:Elastic Modulus; D006801:Humans; D007180:Incisor / Q000601:surgery; D008422:Materials Testing; D011176:Post and Core Technique; D013314:Stress, Mechanical; D014092:Tooth Root / Q000601:surgery; D019553:Tooth, Nonvital / Q000628:therapy*
chemical_list: D003188:Composite Resins; D003722:Dental Alloys; D003764:Dental Materials