Evaluation of the correlation between insertion torque and primary stability of dental implants using a block bone test

Abstract

PurposeImplant stability at the time of surgery is crucial for the long-term success of dental implants. Primary stability is considered of paramount importance to achieve osseointegration. The purpose of the present study was to investigate the correlation between the insertion torque and primary stability of dental implants using artificial bone blocks with different bone densities and compositions to mimic different circumstances that are encountered in routine daily clinical settings.MethodsIn order to validate the objectives, various sized holes were made in bone blocks with different bone densities (#10, #20, #30, #40, and #50) using a surgical drill and insertion torque together with implant stability quotient (ISQ) values that were measured using the Osstell Mentor. The experimental groups under evaluation were subdivided into 5 subgroups according to the circumstances.ResultsIn group 1, the mean insertion torque and ISQ values increased as the density of the bone blocks increased. For group 2, the mean insertion torque values decreased as the final drill size expanded, but this was not the case for the ISQ values. The mean insertion torque values in group 3 increased with the thickness of the cortical bone, and the same was true for the ISQ values. For group 4, the mean insertion torque values increased as the cancellous bone density increased, but the correlation with the ISQ values was weak. Finally, in group 5, the mean insertion torque decreased as the final drill size increased, but the correlation with the ISQ value was weak.ConclusionsWithin the limitations of the study, it was concluded that primary stability does not simply depend on the insertion torque, but also on the bone quality.

Micromotion analysis of different implant configuration, bone density, and crestal cortical bone thickness in immediately loaded mandibular full‐arch implant restorations: A nonlinear finite element study

“…12,16 In contrast, there was less micromotion with the Ao4 configuration than the Cancellous bone density had a significant influence on maximum micromotion, in agreement with previous reports that primary stability was highly dependent on cancellous bone density. 6,40 Crestal cortical bone thickness was also reported to have an important influence on the success of implants. 40 However, we found that the crestal cortical bone thickness only had a major effect on maximum micromotion when associated with low cancellous bone density.…”

“…16 The importance of bone quantity and bone density for implant stability has already been investigated by measurement of ITV, removal torque, Periotest value (PTV), and the implant stability quotient (ISQ) based on resonance frequency analysis. 4,6,[40][41][42] Primary stability is influenced by both cancellous bone density and crestal cortical bone thickness, but these factors generally do not show a linear correlation with ITV, PTV, or ISQ. 42 Moreover, these parameters have somewhat doubtful correlations with other variables.…”

Implant stability in the posterior maxilla: a controlled clinical trial

“…In fact, the achievement and maintenance of an adequate implant stability are fundamental prerequisites for the longterm positive outcomes of osseointegrated implants [13,14]. Implant stability is key for clinical success [13,14]. The concept of primary stability is related to the lack of mobility of the implant after its placement in the implant bed [13][14][15][16][17][18] and to the measurement of the consistency of bone/implant complex [15][16][17][18][19][20].…”

“…In fact, the achievement and maintenance of an adequate implant stability are fundamental prerequisites for the longterm positive outcomes of osseointegrated implants [13,14]. Implant stability is key for clinical success [13,14].…”

Increasing the stability of dental implants: The concept of osseodensification

“…3. surgical factors: achieving primary stability [25][26][27] , mechanical trauma, thermal trauma or infection [28][29][30][31][32] , 4. biomechanical factors: loading conditions 33-35 , 5. patient related factors: systemic disease 29,30,[36][37][38] , systemic medication [39][40][41][42][43] , radiotherapy 44,45 and parafunctional habits 46,47 . Primary stability of the implant is, however, of utmost importance as it is related to the parameters of all five categories.…”