2000 年 13 巻 3 号 p. 511-521
Specirnens were collected from 26 cadavers (18 males, 8 females; 40~90 years old, mean 75.6 years old), which had no injuries to alveolar bone. Five types (type 1, dentious jaw; type 2, molar teeth loss; type 3, first molar or premolar teeth loss; type 4, edentulous jaw, thick jaw body; type 5, edentulous jaw, thin jaw body) were observed by microscopy and scanning electron microscopy.
Microscopy: Compacted alveolar crests (ACs) were found in type 1. Some of them formed vortexlike structures in the spongy bone. In contrast, thin ACs were found in other types. The level of density of the alveolar crest was decreased in types 4 and 5.
Scanning microscopy: Type 1; Regularly arranged bone matrices formed a compact and dense layer in the dental bone. Many small mineralized matrices were found in the cortical bone around Haversian systems.
Types 2 and 3; lrregularly spreading fibrous networks and collagenous bundles were found.
Types 4 and 5; Spreading bone matrices and irregularly arranged fine collagenous bundles were found.
Our observation of existing teeth was concerned with the structure of dental bone in the human mandible, which suggested useful information for implantation. Type 2 is a good condition for implantation in clinical treatment compared with types 4 and 5.