Crestal bone loss known as saucerization is a frequently observed phenomenon. Recent studies have shown that implants with micothreaded crest module reduced the force concentration in the crestal region thus resulting in no or reduced crestal bone loss. This study presents a clinical, histologic, and histometric evaluation of implants with microthreaded crest module and SLA surface.

The implants were placed in the mandible of 5 beagle dogs weighing 10-15kg. Four premolars were bilaterally extracted 8 weeks prior to implant placement. Mucoperiosteal flap was elevated and drilling with increasing diameter was performed under saline irrigation. After countersinking 2 implants were placed in each side resulting in 4 implants per dog. Healing period of 8 weeks was allowed before sacrificing the animals. Histologic preparation was performed for histologic and histometric analysis. Bone to implant contact as well as percentage of bone area inside threads were measured. T-test was used for statistical analysis with p-value p<0.05.

1. Healing was uneventful without any cover screw exposure. New bone formation around the implants was observed without any inflammatory infiltration.

2. Bone to implant contact in the microthread and thread were 43.90 ± 20.30 %, and 53.19 ± 20.97 % respectively. The overall bone to implant contact was 48.54 ± 20.95 %.

3. Percentage of bone area inside threads were 54.43 ± 10.39 %, and 38.44 ± 16.44 % for the microthread and thread respectively. There was statistically significant difference(p<0.05). The overall percentage of bone area inside threads was 46.67 ± 15.68 %.