各種覆髄剤による乳歯生活歯髄切断後の治癒機転に関する病理組織学的研究

Abstract

The author performed the vital pulpotomy on deciduous teeth using paste type Procal from calcium hydroxide, paste type Cavitec from zinc oxide eugenol, and FC process from formocresol and examined them histologically about healing after pulpotomy on vital pulp of deciduous teeth and the results are as follows : 1. Forming of necrosis layer is observed on the part given vital pulpotomy ; it is rather extensive in case of using FC process and comparatively slight in the case of using Procal and Cavitec. 2. Fourteen days after operation, in the case of using Procal, the pulp surface touched with agent becomes hyalinized and inflammatory cells infiltration, congestion and bleeding were observed in the lower part of the pulp. In the case of using Cavitec, infiltration of inflammatory cells and bleeding are remarkably observed in the pulp surface, and diffuse infiltration is seen to the lower part of pulp tissue. In the case of using FC process, infiltration of inflammatory cells is observed, in the pulp surface, but the whole pulp becomes fibrous and it stains light purple by silver impregnation and light red by Elastica van Gieson. 3. From 21 days to 92 days after the operation, in the case of using Procal, inflammatory cells infiltration is clearly observed and inflammatory granulation tissue remarkably proliferates after 21 days. When 35 days pass, calcareous tissue is formed between necrosis layer and the pulp and seals cells inside. A layer stained dark purple by silver impregnation, and light red by Elastica van Gieson appears. When 92 days pass, a hard tissue made of osteoid dentin containing cells of different thickness is recognized in the pulpotomy. It stains dark purple or blackish purple by silver impregnation, and light red or red by Elastica van Gieson. Therefore it is recognized as collagen stroma, but is uneven in appearance and partly remains fibrous. In the case of using Cavitec, abscess is found in the pulp surface and proliferation of inflammatory tissue is remarkable in the pulp below. The pulp farther below is healthy and vital. In the case of using FC process, fibrous change found after 14 days continued till the 92nd day. 4. Internal resorption is observed on the 35th day for Procal, on the 21st day and the 92nd day for Cavitec, and the 21st day for FC process.