ヒトの歯の耐疼痛限界における牽引荷重量について
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概要
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To make clear of histological, physiological and dynamical attitudes for stress in periodontal membranes are very important in dentistry. It is especially valuable in prosthetics, periodontics and orthodontics fields. For adequately treate the tooth in prosthetics, it is important not only discuss the mobility orbitting forces of tooth which applied bucco-lingual or on axial direction loads, but also discuss stretch out or horizontally applied pulling stress to the teeth. The author has been measured the resistance attitudes for stretching forces by using the author newly designed intra-oral pulling loads divice. The subjects were 50 male in 20 years age groupe whose were having healthy permanent dentitons, normal dental arches, normal interdesitations and normal excentric relationship. The resistance for pulling foces were measured along tooth axis direction (Vertical pulling forces), and on horizontal bucco-lingual direction (Horizontal pulling forces). From all of those findings can be summarized as follows. 1. The vertical pulling forces were aligned in orders from low to high as follows. On maxillary teeth were same on both side, Lateral incisor≒Central incisor amp;Second premolar≒First premolar≒Cuspid amp;Second molar≒First molar. On the mandible teeth were same on both side, Central incisor≒Lateral incisor amp;First premolar≒Second premolar≒Cuspid amp;Second molar≒First molar. (≒means no significant difference between two teeth, amp;means significant difference between two teeth.) 2. The horizontal pulling forces were aligned in orders from low to high as follows. On the maxillary teeth were same on both side, Lateral incisor≒Central incisor amp;Second premolar≒First premolar≒Cuspid. On the mandible teeth were also same on both side, Central incisor≒Lateral incisor amp; First premolar≒Second premolar≒Cuspid. 3. Comparing the vertical and horizontal pulling forces on same teeth, right side teeth were slightly higher than the others. However there were no significant difference between each teeth. 4. Comparing the vertical and horizontal pullig forces on same group teeth between two arches, maxillary teeth were higher than mandible teeth. There were no significant difference except on central incisor. 5. The vertical pulling forces and horizontal pulling forces were compared on same teeth, the horizontal pulling forces were nreater than the others on both arches and both side. Howerver there were no significant difference except on central and lateral incisors.
- 社団法人日本補綴歯科学会の論文
- 1974-06-29