RESUMO
PURPOSE: The aim of the present study was to construct a nonvascular transport disc to repair the canine mandibular defects model and to perform a dynamic analysis of the new bone obtained by nonvascular transport distraction osteogenesis (NTDO) in canines. MATERIALS AND METHODS: Thirty adult dogs were randomly divided into 3 groups, with 10 dogs in each group. Canine mandibular defect models of NTDO were constructed. All the dogs were marked by tetracycline hydrochloride at a different distraction stage. The dogs were euthanized at 2, 4, and 12 weeks after distraction, and the quality ratio of calcium and phosphate for the new bone was measured using electron dispersive spectroscopy. RESULTS: The canine mandibular defects were successfully repaired. Using tetracycline hydrochloride, we successfully observed the quality and speed of new bone formation. The quality ratio of calcium and phosphate was similar between the new bone formation and the original bone. The time spent using a nonvascular transport disc to repair mandibular defects was consistent with using a vascularized transport disc, and the quality of the new bone and the original bone was exactly the same. CONCLUSION: When the bone mass is insufficient or the conditions are not suitable for a vascularized transport disc, the nonvascular transport disc can be used as an alternative.
Assuntos
Mandíbula/fisiologia , Osteogênese por Distração/métodos , Osteogênese/fisiologia , Animais , Matriz Óssea/química , Matriz Óssea/patologia , Regeneração Óssea/fisiologia , Cálcio/análise , Modelos Animais de Doenças , Cães , Corantes Fluorescentes , Mandíbula/química , Mandíbula/patologia , Doenças Mandibulares/cirurgia , Microscopia Eletrônica de Varredura , Osteogênese por Distração/instrumentação , Fosfatos/análise , Distribuição Aleatória , Espectrometria por Raios X , Tetraciclina , Fatores de TempoRESUMO
PURPOSE: To evaluate the clinical effect of joint reconstruction by using autogenous coronoid process graft to treat temporomandibular joint(TMJ) ankylosis. METHODS: Nine cases of TMJ ankylosis from September 2008 to September 2010 were surgically treated by joint reconstruction with autogenous coronoid process graft, using autogenous articular disc or prosthodontic membrane as interpositional material. Mouth opening, occlusion and cone beam CT(CBCT) were used for evaluation before and after surgery. RESULTS: Satisfactory mouth opening was achieved in all patients and no one got occlusal changes or reankylosis during follow-up. CBCT showed that coronoid process graft reached bone union with the ramus and turned to be round. CONCLUSIONS: It is effective to cure TMJ ankylosis through joint reconstruction with autogenous coronoid process graft.
