The effect of the thread depth on the mechanical properties of the dental implant

Abstract

PURPOSEThis study aimed to evaluate the effect of implant thread depth on primary stability in low density bone.MATERIALS AND METHODSThe insertion torque was measured by inserting Ti implants with different thread depths into solid rigid polyurethane blocks (Sawbones) with three different bone densities (0.16 g/cm3, 0.24 g/cm3, and 0.32 g/cm3). The insertion torque value was evaluated with a surgical engine. The static compressive strength was measured with a universal testing machine (UTM) and the Ti implants were aligned at 30° against the loading direction of the UTM. After the static compressive strength test, the Ti implants were analyzed with a Measurescope.RESULTSThe Ti implants with deeper thread depth showed statistically higher mean insertion torque values (P<.001). Groups A and group B had similar maximum static compressive strengths, as did groups C and D (P>.05). After the static compressive strength, the thread shape of the Ti implants with deeper thread depth did not show any breakage but did show deformation of the implant body and abutment.CONCLUSIONThe implants with deeper thread depth had higher mean insertion torque values but not lower compressive strength. The deep threads had a mechanical stability. Implants with deeper thread depth may increase the primary stability in areas of poor quality bone without decreasing mechanical strength.

Evaluation of the effect of self‐cutting and nonself‐cutting thread designed implant with different thread depth on variable insertion torques: An histomorphometric analysis in rabbits

“…25 Although the limitations of this study were, tibia was chosen as the bone of choice, as it has very little cortical bone ranging from 3 to 4 mm which is why they measured top 3 threads for the percent osseointegration and the reason for low insertion torques. 33 depth increases primary stability and thus increasing the BIC which is in consensus with our study.…”

“…32 But, a study by Sun-Young Lee concluded that deeper thread G RAPH 3 Comparison of mean values of BIC and BV between high torque 0.4 and 0.6 mm sized V-shaped implants depth increases primary stability and thus increasing the BIC which is in consensus with our study. 33…”

Evaluation of mechanical strengths of three types of mini‐implants in artificial bones

“…They found that outer and inner diameters are the most crucial factors for primary stability at the same implantation depth. Lee et al [18] evaluated the effect of thread depth on the primary stability of mini-implants in low-density bone. They showed that mini-implants with larger thread depth produced improved primary stability and higher RF value at the same inner diameter.…”

Evaluation of primary stability of single implants placed in fresh extraction sockets: a clinical trial

“…[12,13] The implant system used in this specific trial (BT SAFE Bone Level Implants) has a specific implant body design with a quite accentuated morphology, which enables faster insertion, in conjunction with a double-thread design to direct the drilled bone immediately in contact with the surface of the implant.…”