Effect of longitudinal flutes on miniscrew implant stability and 3-dimensional bone formation.

Abstract

The purpose of this study was to evaluate the effects of longitudinal flutes on miniscrew implant (MSI) stability and bone healing. Using 11 skeletally mature New Zealand white rabbits, we placed 31 longitudinally fluted and 31 nonfluted, 3-mm-long MSIs in standardized positions in their calvaria and immediately loaded them with 100g using nickel-titanium coil springs. Insertion torque values were obtained for each MSI placed; removal torque values were obtained for 28 MSIs that had been in place for 6weeks and 20 MSIs that had been in place for 2weeks. The bone volume fractions at 6 to 24, 24 to 42, and 42 to 60μm from the MSI surfaces were evaluated using microcomputed tomography with an isotropic resolution of 6μm. The success rate was 97% for both the fluted and nonfluted MSIs. The difference in insertion torque between the fluted and nonfluted MSIs was not statistically significant (P=0.930). After 2weeks, there was no statistically significant (P=0.702) difference in removal torque between the fluted and nonfluted MSIs. After 6weeks, removal torque values were significantly (P=0.008) higher for the fluted (3.42±0.26N.cm) than the nonfluted (2.49±0.20N.cm) MSIs. Bone volume fractions of the 6-to-24-, 24-to-42-, and 42-to-60-μm layers were significantly (P<0.05) greater for the nonfluted than the fluted MSIs. Loaded 3-mm-long MSIs with and without flutes have high success rates. Longitudinal flutes placed in 3-mm MSIs increased their removal torque by 37% and decreased the amount of bone immediately surrounding them.