Clinical study on insertion torque and resonance frequency analysis to evaluate primary and secondary stability in dental implants Mozo Grau InHex®

Revista Internacional de Prótesis Estomatológica, Volumen 17, Número 2, 2015


Obtain values of primary stability (final ISQ ), secondary stability (ISQ osseointegration) and final insertion torque (ITV) and study how implant length, diameter, location, genre and bone type affect osseointegration. Analyze the existence of a possible correlation between ITV and final ISQ, and final ISQ and osseointegration ISQ; as well as to assess the variations between the final ISQ and ISQ after osseointegration period.


A total of 25 Mozo Grau InHex® implants were placed in 12 patients by a very experience surgeon. The moment of the placement surgery, the final insertion torque and the primary stability in ISQ values ( coefficient of primary stability measured by Ostell device ® ) were registered. After the osseointegration period ISQ was measured again to evaluate the secondary stability.


The ISQ average registered at the time of implant placement was 77,34 ± 4,68. The average obtained in the variable ISQ osseointegration was 78,86 ± 4,42. The average value obtained from the insertion torque was 31,80 ± 12,23 Ncm. It was observed a high correlation statistically significant r = 0,755 between final ISQ and maximum ITV. The variables final ISQ and ISQ osseointegration show a moderate correlation statistically significant = 0,470. No differences between final ISQ and ISQ osseointegration were obtained.


It was noticed an increased ISQ final value in the mandible, whereas it was found higher os- seointegration ISQ value for bones type II and III with regard to type IV with differences sta- tistically significant. On the other side, greater ITV was observed in men, in mandible location and in bones type I and II. The significant correlation between final ISQ and maximum ITV suggests that a greater insertion torque will most likely achieve greater primary stability. It was not found correlation statistically significant between osseointegration. ITV and ISQ. Al- though without statistic confirmation it seems ISQ values tend to be equal (rising the lowest and lowering the highest) after the osseointegration period.

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