Abstract: PURPOSE: To compare and analyze the pullout force and form of the traditional anchoring nail and modified anchoring nail, which were placed in the inferior border of mandibular condyle during open surgery of TMJ anchorage. METHODS: Ten resected condyles were obtained from patients with TMJ replacement due to TMJ osteoarthrosis. Traditional and modified anchoring nails with 3-0 anchoring lines, modified anchoring nail with 2-0 anchor line were implanted respectively in the cortical bone of the inferior border of mandibular condyle. Each group contained 20 nails and was tested by tensile tester to observe the cortical bone damage, anchor nail breakage or loosening and line fracture. The data were analyzed with SPSS17.0 software package. RESULTS: During the two kinds of medical anchoring nail implantation and tensile test, bone cortex damage, anchoring nail fracture and loosening did not occur, except line fracture. Maximum tensile force of traditional nails with 3-0 anchoring lines, modified anchoring nails with 3-0 anchoring lines and modified anchoring nails with 2-0 anchoring lines was (27.53±5.47) N, (25.89±2.64) N and >50 N, respectively. There was significant difference between traditional and modified anchoring nail with 3-0 anchoring line (P<0.05), there was also significant difference between traditional anchoring nail with 3-0 anchoring line and modified anchoring nail with 2-0 anchoring line. CONCLUSIONS: Both conventional and modified medical anchoring nails can be successfully implanted into the condylar neck without nail fractures and damaging the condylar neck cortical bone. The modified anchoring nails are more competent in adapting the condyle anatomical shape, and proven to be safer and more comfortable. Furthermore, the 2-0 anchored line can withhold a higher pull force than the conventional anchoring nails.

Key words: Type 2 diabetes mellitus, Blood glucose control, Dental implant, Stability, Inflammation