Clinical Analysis On The Position Of Condylar Process And The Height Of Bone Grafts In Benign Mandibular Tumor Resection With Intra-oral Route And Immediate Reconstruction By Non-vascularized Iliac Bone Grafts

ObjectiveTo investigate the change of the position of condylar process and the height of bone grafts in benign mandibular tumor resection with intra-oral route and immediate reconstruction by non-vascularized iliac bone grafts.MethodsIn this article,20 patients admitted to the Department of Oral and Maxillofacial Surgery, Second Xiangya Hospital of Central South University for benign mandibular tumor were followed from June 2006 to April 2010. All of them were treated with benign mandibular tumor resection via intra-oral route and immediate reconstruction by non-vascularized iliac bone grafts. We divided them into groups according to the preservation of condylar process and the blocks of free autogenous iliac bone. We measured the height of free autogenous iliac bone and the joint space by panoramic radiographs to discuss the the change of the position of condylar process and the height of free autogenous iliac bone in benign mandibular tumor resection with intra-oral route and immediate reconstruction by non-vascularized iliac bone grafts.Results1. The linear distances of TMJ space showed no significant differences (p>0.05), and it was not statistically significant (p>0.05) on the ration between anterior TMJ and posterior TMJ linear distances before and after operation in group A.2. It was statistically significant (p<0.05) on the linear distances of TMJ space, and the ration between anterior TMJ and posterior TMJ linear distances showed significant differences (p<0.05) before and after operation in group B.3. The absorption rate of bone grafts of ramus 3 months,6months and 12 months after operation was 1.8%,3.2% and 4.3% in group A.4. There was obvious reduction in group B. The absorption rate of bone grafts of ramus 3 months,6months and 12 months after operation was 7.9%,19.8% and 34.7%.5. The average absorption rate of the bone grafts showed no significant difference between group C and group D 3 months,6months and 12 months after operation. The rate was 0.8%-4.7% more in group D. The B and B'spot of bone grafts were absorbed much heavier in group D, and the rate was 4%-16.5% more than in group C.Conclusion1. The position of condylar process showed no change in the condyles reserved cases, while the condylar process of the normal side moved forward in the condyles removed cases after operation.2. Comparing with one bone graft, the absorption rate was higher in the position of two bone grafts contacted。3. The preservation of condylar process can keep the height the bone grafts.4. The average absorption rate of the bone grafts showed no significant differences between the operation with intra-oral route and the outside route.