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KMID : 0378019750180050655
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New Medical Journal
1975 Volume.18 No. 5 p.655 ~ p.660
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A Study on Bone-tooth Homografts
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Abstract
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Tooth transplantation has been the subject of extensive studies for many years. The literature is replete with the articles which describe auto-, homo-, and hetero-transplantation experiments in animals. Grafting adult, completely formed teeth generally is unsatisfactory. Exfoliation of the graft occurs because of interruption of the blood supply to the periodontal membrane, trauma to the cementum, infection from the oral cavity and inadequate contact between graft and host. A technic to minimize these deterrents to a successful graft might be to include the bone surrounding the tooth, thus preparing a done-tooth block.
Materials and Methods:
In this study, transplants were obtained from dogs of approximately 2-week old, and were consisted of a tooth germ or germs with encasing osseous tissue 2 to 10kg in weight, 2 to 8 months in age were selected as host animals. The anesthesia and surgical procedures were made in usual manner. Bone-tooth blocks grafted to the different host sites of mandible, long tubular bone, subcutaneous, and intramuscular tissues.
The bone-tooth grafts with surrounding tissue were removed, fixed in . 100/1 formalin, decalcified, embedded in celloidine, sectioned, and stained with hematoxylin and eosin. Findings: Subsequently to the grafting, macroscopic, roentgenographic, and microscopic examinations have been made on 10th, 30th, 60th days, 4 and 6 months. Evidence revealed throughout these observations seems to indicate following conclusions:
1. In this experiment, in which a bone-tooth graft to the external surface of mandible and long tubular bone, it has been observed that in course of time attached bony tissue of the transplants was found to have been gradually resorbed; and those calcified parts of toothgerms were found to loose its independency, and instead become an integral part of the newly formed bony tissue originating from the host site.
2. From those group wherin grafts were implanted to the subcutaneous and intramuscular tissues, resorption rate of osseous tissue of the grafts was noted to be faster than those transplanted to
the hard structures. Towards the end of the experiments, it was noted that calcified tissue of the
I toothgerms was completely surrounded by the connective tissues due to the complete resorption of the
bone that originally surrounded toothgerms of transplants.
3. In this study, odontoblastic layer continued to exist up to 30 days for those group in which grafting was made to the external surface of mandible and long tubular bone. However, those transplanted to the subcutaneous and intramuscular tissue. were observed to have retained these odontoblastic layer on 10 days.
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