Evaluation of immediate cell viability and repair of osteotomies for implants using drills and piezosurgery. A randomized, prospective, and controlled rabbit study

Purpose: The objective of this study was to evaluate the immediate bone damage and bone repair after osteotomy for implants using conventional drills and drills powered by piezoelectric motor. Materials and methods: Twelve rabbits received a tibial osteotomy with a conventional drill (control), with a diamond like carbon drill (DLC) and with a piezoelectric drill (Piezo). The animals were euthanized immediately, 30 and 60 days postoperatively. The tibias were removed and analyzed by means of histomorphometry, immunohistochemistry and microtomography. Results: The immediate damage to the tissue at the cavity margins was similar (P >.05). At 30 and 60 days, the amount of newly formed bone tissue was similar (P >.05). Osteocalcin was intense score at 60 days in Piezo group. Microtomography revealed that bone volume at 30 days (control 3.8; DLC 4.3; and Piezo 2.4) and 60 days (control 4.9; DLC 4.82; and Piezo 3.95) were similar. There was a significant difference in bone formation between 30 (2.4) and 60 days (3.95) for the Piezo group (P =.016). Conclusion: The immediate effects and repair of cavities made using conventional, DLC coated, or ultrasound drills were similar.