성견에서 임플란트 주위 골 결손부에 저온 및 고온 열처리한 자가치아 회분말 이식시 골형성에 대한 조직형태계측학적 평가

Abstract

Purpose : The purpose of this study was to compare the bone formation of autogenous tooth-ash treated by different heat temperature with control group. Materials and Methods : Six dogs, weighing from 10 to 15 kg, were used in this study. Before implantation on ilium, maxillary teeth of dogs were extracted and low or high heat was treated. Heat treated tooth-ash was made to powder type graft materials. The implant fixture, with RBM (resorbable blast medium) coated, 3.7mm diameter and 10mm length tapered type, were implanted for 12 weeks in right iliac crest and for 6 weeks in left iliac crest. Three bone defects using 8mm trephine bur were made in both ilium of 8mm diameter and 4mm depth, then implants were placed. No bone graft in bone defects was done in control group. In experimental groups, 2 different heat treated tooth-ash were placed in gaps between implant and bone defects: low heat treated tooth-ash for experimental group I; high heat treated tooth-ash for experimental group II. Right iliac crest grafts had 12 weeks bone forming period, on the other hand, left side had 6 weeks. Finally, 6 dogs were sacrified in 12 weeks of the experiment and tissue samples were assessed histomorphometrically. Results : The implants had successful stability and bone formation aspects were different between experimental groups. Control group had a poor bone formation and showed large quantities of loose connective tissue. Group I (low heat treated tooth-ash) represented that good healing and bone formation. Group II showed middle rate of bone formation between group I and control group. Conclusion : The results suggested that heat treated tooth-ash may generate new bone formation and osteo-inductive or osteo-conductive effects. High heat treated tooth-ash group showed the highest bone formation rate in early stage and had statistically significance. High heat treatment was optimal treatment methods of making tooth-ash.