生活齒根 切斷後 齒髓 및 齒根端의 組織變化에 對한 實驗的 硏究

HISTOPATHOLOGIC CHANGES AFTER VITAL TOOTH APICOECTOMY

This experimental investigation was undertaken to observe the pulpal and periapical changes after the intentional vital tooth apicoectomy. 4. adult mokeys were used, and roots of maxillary & mandibular quadrants were transected within the apical third with a fissure-bur. The dentoalveolar segments for 1, 2, 4, 6 weeks following surgery were obtained and examined by routine histologic preparation with H-E stain & Preece s trichrome stain. The results were as follows; 1. At 1 week after vital tooth apicoectomy, necrosis with disruption of normal pulpal tissue and infiltration of some inflammatory cells were found. 2. At 2 weeks the transection wounds were filled with new collagen and granulation tissues. The necrotic pulp was replaced with periodontal ligament like tissues. 3. At 4 weeks most of the pulps were replaced with periodontal connective tissue and a lining of cellular cementum covering the root canal walls. 4. At 6 weeks the pulps had intact vascular supply and periodontal ligament appearance. The gradual deposition of cementum along the root canal walls and collagen fiber bundles between the new bone & the newly deposited cementum could be seen.