Implant micromotion is related to peak insertion torque and bone density

Abstract

Results showed that increasing the peak insertion torque reduces the level of implant micromotion. In addition, micromotion in soft bone was found to be consistently high, which could lead to the failure of osseointegration. Thus, immediate functional loading of implants in soft bone should be considered with caution.

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

“…and the macrogeometry, 7-10 thread design, 11 surface roughness, 12 or abutment angulation 13 of the implant, as well as bone density, [14][15][16] cortical bone thickness, 16,17 and the direction of loading. 9,18,19 Of these factors, inadequate bone quantity and low bone density have been identified as increasing the risk for immediate loading of implants.…”

Determination of Micromotion at the Implant Bone Interface - An In-Vitro Methodologic Study

“…Although not directly measuring implant micromotion, measurements of implant insertion torque [16,[21][22][23] are clinically applicable and may provide some information on when immediate loading of implants is feasible. Based on the decreasing levels of implant displacement measured with increasing bone density, it might be possible to predict the amount of micromotion at the implant-bone interface based on a reliable assessment of bone quality [1,3].…”

“…However, with the goal of shortening treatment times, novel concepts predominantly focus on early and immediate loading protocols [9]. As a consequence, micromotion at the bone-implant interface has gained increased recognition as a potential risk factor [15,16].…”

“…However, with the goal of shortening treatment times, novel concepts predominantly focus on early and immediate loading protocols [9]. As a consequence, micromotion at the bone-implant interface has gained increased recognition as a potential risk factor [15,16].Various techniques have so far been described in the literature for determining bone quality [17] and implant stability based on which the surgeon should decide whether or not immediate loading was feasible. Besides the subjective evaluation of conventional radiographs as well as recording the surgeon's tactile sensation during implant site preparation [18] 3D radiographs [19,20] providing numerical data as grey scales (CBCT -cone beam computed tomography) or Houndsfield units (CT -computed tomography), measurements of implant insertion torque16and primary implant stability using resonance frequency analysis (Osstell, Osstell AB, Gothenburg, Sweden) or damping capacity assessments (Periotest, Gulden Medizintechnik, Modautal, Germany) have been reported [21][22][23].…”

External Hexagon Deformation in Implants Subjected to Internal Torque

“…Although these implants have been the most frequently performed, fatigue or overload failures such as deformation of the hexagon may occur during surgical placement of the implants, due to their different manufacturing tolerances. Higher insertion torque values reduce the risk of implant micromovements at the bone-implant interface, thereby obtaining higher rates of success of immediately loaded implants (6,7). On the other hand, implants can undergo morphological changes during torsion when inserted into bone (8).…”