An in vitro study of temperature changes in type 4 bone during implant placement: bone condensing versus bone drilling

Abstract

Objective. The aim of this study was to compare changes in temperature of the surrounding bone at various osteotomy depths during implant site preparation by bone condensing and by bone drilling as well as the dynamics of their change. Study design. In the present "in vitro" study, pig ribs with uniform thickness of cortical bone of 2 mm were used. Lateral bone-condensing (experimental group) and bone-drilling techniques (control group) were performed. Temperature changes were recorded at a distance of 0.5 mm from the final test osteotomy by 3 thermocouples at the depths of 1, 5, and 10 mm in tripod configuration. Data were collected from 48 measurements, 24 for each group. Results. Significantly higher mean temperature increase at the depth of 5 mm was observed during bone drilling compared with bone condensing, whereas for the depths of 1 and 10 mm differences were not significant between the 2 surgical techniques. During bone condensing, the mean temperature rise was continuously decreasing with increasing depth of osteotomies, whereas during bone drilling the mean temperature rise was first increased and reached a peak at the depth of 5 mm and then began to decrease with increasing depth of the osteotomies. Conclusions. The bone-condensing technique applied in the jaw bone class D4 offers an advantage over bone drilling because it generates a significantly smaller amount of heat. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2011; 112: 28-33)