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KMID : 1023820150070020115
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The Journal of Advanced Prosthodontics
2015 Volume.7 No. 2 p.115 ~ p.121
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The effect of the thread depth on the mechanical properties of the dental implant
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Lee Sun-Young
Kim Sung-Jun
An Hyun-Wook
Kim Hyun-Seung
Ha Dong-Guk
Ryo Kyung-Ho
Park Kwang-Bum
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Abstract
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PURPOSE : This study aimed to evaluate the effect of implant thread depth on primary stability in low density bone.
MATERIALS AND METHODS : The 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.
RESULTS : The 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.
CONCLUSION : The 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.
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KEYWORD
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Deep thread, Primary stability, Insertion torque, Compressive strength, Dental implant, Mechanical stability
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