犬の部分的無歯顎堤における義歯装着による骨の動態 こう合力支持方法の違いによる影響

Abstract

The purpose of this study was to elucidate the properties of the alveolar bone under mechanical stress. The alveolar bone dynamics were examined in the mandibular edentulous ridges by means of two types of dentures, that is, the tooth-bone type (T-type) and the mucosa-bone type (M-type). The ridges under these dentures for 4 and 12 weeks were compared with each other, as well as to those without dentures (controls) in the same dogs.Decalcified sections of alveolar bone were prepared for observation by contact microradiography and fluorescent microscopy.The following results were obtained.1. The trabecular bone in the edentulous ridge, as well as around the abutment teeth, increased in thickness and density under the T-type denture application, but there were few findings like that under the M-type denture application.2. The resorption in the mucoperiosteal side and the deposition in the endosteal side were increased on the surface of compact bone at the top of the edentulous ridges underboth types of denture application, but such bone resorption was more remarkable under the M-typethan the T -type.These differences of the bone dynamics seem to depend on the difference between the edentulous ridge and the dentulous ridge in the supporting structure of occlusal force.