Morphology of dentin of teeth covered with artificial crowns

Abstract

The process of studying the structure of dentin showed that the dentinal tubules penetrate the entire dentin thickness and occupy up to 30 % of the coronal portion. On the cross-sections they are oval in shape with smooth or jagged edges because of the processes of de-and remineralization which involve peritubular dentin. In the study of the micromorphology of the dentin of the tooth under the artificial crown, in 75 % of cases the zones of "dark" and "enlightened" dentin (the hypermine-ralization processes are predominant) and in 15 % of cases the broad band of "light" (mainly the demineralization processes are predominant) are observed. The study of the micromorphological pattern of carious lesions under the artificial crown revealed the area of focal hypermineralization dentinal tubules in 35 % of cases, the area of focal demineralization in 20 % of cases, and the combination of the zones of hypermineralization and demineralization in 45 % of cases. The study of macro-morphology of caries found that the carious process often occurred with a combined lesion of the coronal, cervical, and root areas (58.5 %). It was revealed that the main feature of caries in teeth under artificial crowns was the presence of slit-shaped cavities, "destruction on a plane without clearly defined boundaries of cavities", recurrent caries.