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PubMed2005

Evaluation of the prognosis and causes of failure in 182 cases of autogenous tooth transplantation.

OBJECTIVES: Autotransplantation is a viable option for treating missing teeth when a donor tooth is available. The aim of this study was to evaluate the prognosis in addition to the causes of failure in 182 autotransplanted teeth. STUDY DESIGN: A total of 182 cases of autotransplantation were analyzed. All the transplants were performed according to a computer-aided rapid prototyping technique with an average extraoral time of 7.58 minutes. These cases were followed for 2 to 60 months after surgery. The prognosis was divided into 4 groups, complete healing, incomplete healing, uncertain healing, and failure. The initial stability, root resorption, and ankylosis were also analyzed. RESULTS: Most transplanted teeth showed complete healing between postoperative 2 months and 8 months. The transplanted teeth with a good initial stability showed better initial healing than those with a poor initial stability. The average extraoral time was 7.58 min (range: immediately after extraction up to 25 min). There was no relationship (P > .05) between the extraoral time and either root resorption (4 cases, 2.4%) or ankylosis (18 cases, 10.7%) within this experimental time period. Nine cases (4.5%) failed. CONCLUSION: This study showed a 4.5% failure rate during the short to intermediate observation period. Autotransplantation is a very useful method for replacing missing teeth, provided that the extraoral time and other factors are well controlled.

Adolescent↗
PubMed2000

[Application of enamel matrix derivative for tooth transplantation and replantation].

OBJECTIVE: The purpose of this study was to clarify the effects of enamel matrix proteins on the regeneration of periodontal ligament (PDL), during transplantation and replantation therapy. MATERIALS AND METHODS: [Exp 1] The crown and root apex of extracted dog teeth were removed and the remaining root separated longitudinally. Two-thirds of crown-side PDL and cementum were removed. Prepared teeth were covered with propyleneglycol alginate (PGA) both with and without enamel matrix derivative (EMD) and cultured for 0-14 days. The outgrowth length of the tooth was measured and histological observation done. [Exp 2] The incisal teeth of adult dogs were extracted and 2/3 of crown side PDL and cementum removed. Prepared teeth were treated with PGA containing EMD (EMD group). No tooth treatment was done in the control group. Following PGA treatment, teeth were replanted. The animals were sacrificed at 2 and 4 weeks after replantation and histological observation performed. RESULTS: [Exp 1] The outgrowth length of the EMD group was longer than that of the other groups. The width of proliferated cell layer on the tooth in the EMD group was thicker. [Exp 2] Ankylosis surface of the EMD group was smaller than that of the control group. In the control group, the region of ankylosis increased longitudinally. In the EMD group, the newly-formed cementum was predominantly cellular cementum. CONCLUSION: The results suggested that enamel matrix protein enhance the regeneration of PDL and prevent tooth ankylosis in transplantation and replantation therapy.

Animals↗