금속 매식법에 의한 가토의 봉합성 안면골 성장에 관한 X-선학적 연구

A study of the sutural facial bone growth of rabbit ; Serial roentgenographic study by means of metallic implants

The present study has the purposr of investigating various growth and developmental aspects of rabbit snout with the aid of metallic imlantation and of improving on the indirect method of growth and developmental studies of its skull. Sixty-eight growing albino rabbits were used. A head holder, film holder, cephalometer, metallic implanting device and implant materials were designed and constructed by the author. Eight metallic pins wereimplanted with a metallic implanting device in the rabbit snout under general anesthesia. Two metallic pins were implanted on each side of the interfrontal suture and another two were put on each side of the internasal suture near the frontonasal suture. Serial cephalograms were taken with a two-week interval, using the head holder, film holder and cephalometer. Eight items of linear measurement were obtained from the film. On the base of the results of the study, the following conclusions are obtained: 1. The metallic implant method is better than the other indirect methods for growth and developmental studies of the rabbit skull. 2. Most of the vertical growth of the rabbit snout is due to sutural growth at the frontonasal suture and the horizontal growth is at the interfrontal and the internasal suture. 3. The vertical growth of the rabbit snout is greater than the horizontal growth. 4. The horizontal growth of the rabbit snout is greater at the nasal bone than at the frontal bone. 5. The amount of bertical growth of the rabbit snout is almost same at inner and outer side of the interfrontal and internasal suture line. 6. Growth rate of the sutural growth of the rabbit snout tends to decrease by the growtu of the rabbit. 7. Implant materials do not disturb growth and development of the rabbit snout, except a slight trauma effect during the first week of metallic implantation.