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Study of behaviour and endurance of Bioapatite implanted in the periodontium of the dog (closed model).

The principle purpose of this study was to quantify endurance of the biomaterial Bioapatite implanted in periodontal structures of the dog (closed model), such quantification being established by means of indices (Endurance Index and Transformed Endurance Index) obtained as a result of data-processed analysis of histologic images. The investigation further aimed at studying the development of new cementum and the reconstruction of an attachment system. The study was conducted on eight dogs and 222 sections. New cementogenesis and the reconstruction of an attachment system are observed both in the test sites and the reference sites. Endurance of the biomaterial is statistically linked with time: the most substantial decrease in the endurance is observed between two and six months. Traces of the material subsist at month 9. The structure of material masses always remains lacunal on a microscopic scale (highest average Endurance Index observed during the investigation: 30.35%). An osteoid deposit can be continually detected as of the second month around crystalline deposits. Further, this type of deposit was noted on the periphery of the deposits implanted in ectopic position in the supracrestal connective tissue.