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백서에서 Depulpin^®과 Formocresol에 대한 치수와 치근단 조직의 반응

Pulpal and Periapical Reaction to Formocresol and Depulpin^® in the Rat Teeth

구강과학- 전남대학교 2002년 14권 2호 p.168 ~ 177
문형인, 박상원, 황인남,
소속 상세정보
문형인 (  ) - 전남대학교 치의학연구소, 치과대학
박상원 (  ) - 전남대학교 치의학연구소, 치과대학
황인남 (  ) - 전남대학교 치의학연구소, 치과대학

Abstract


One fifth dilution of formocresol is usually used for pulpotomy of the primary teach and emergency pulpotomy of the permanent teeth. However, the use of formaldehyde has been subjected to criticism because it may be absorbed into the blood stream and become distributed systemically, it may also alter the pulp tissue rendering it immunologically active, and have carcinogenic potential. Recently Depulpin^(r)(VoCo., Germany) gains popularity as a devitalizing agent during root canal therapy in spite of high concentration of 49% paraformaldehyde because it facilitate devitalization of pulp and make root canal therapy easier. But there have been not enough publications about the reaction of pulp and periapical tissue caused by Depulpin.
This study was performed to evaluate the histological changes in pulp and periapical tissue of rats after pulpotomy using formocresol and Depulpin and to elucidate the toxic effects of these agents. Thirty six Sprague-Dawley rats were anesthetized by intraperitoneal injection of ketamine. Maxillary first molar teeth were used for pulpotomy with formocresol and Depulpin. Rate were sacrificed after 2days, 4days, 1week, 2weeks, 3weeks and 4weeks respectively. Specimens were histologically observed by light microscope changes in pulp and periapical tissue. The obtained results were as follows.
1. Formocresol group
A zone of fixed tissue, in which odontoblasts could clearly be defined, was present directly underneath the pulpotomy dressing in almost all teeth of this group. This was followed by an area of necrotic tissue which resembled dried out fibrous tissue with no cellular detail except some pyknotic nuclei. In the specimens of after 2days, 4days, 1week, 2weeks in which vital tissue was present, it was separated from the fibrous area by a zone of inflammation. In the specimens of after 3weeks and after 4 weeks, inflammatory infiltrate was in the periodontal ligament adjacent to the apical foramina of the teeth.
2. Depulpin^(r) group
The area of necrotic tissue which had no cells and fibers, was present adjacent to the dressing. This was followed by dried out fibrous tissue with no cellular details except some pyknotic nuclei. A short stump of vital pulp with odontoblasts was present at the end of the canal after 2days. Inflammatory infiltrate was in the periodontal ligament after 4days and after 1week. Severe root resorption and necrosis of periapical tissue opposite the root resorption site were defined after 2 weeks and after 3weeks. Periapical lesion which consist of necrotic tissue surrounded by fibrous connective wall, was found after 4weeks.
The results indicated that Depulpin can cause more adverse reaction to the dental pulp and periapical tissue than formocresol, and further studies are needed for its clinical use with safety.

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