The effect of the thread depth on the mechanical properties of the dental implant.
OBJECTIVE
This study aimed to evaluate the effect of implant thread depth on primary stability in low density bone.


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/cm(3), 0.24 g/cm(3), and 0.32 g/cm(3)). 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.


CONCLUSIONS
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.
Institute of Science & Technology, Megagen Implant, Gyeongsan, Republic of Korea.
Sun-Young
0000-0003-2016-4339
SY
Lee
Institute of Science & Technology, Megagen Implant, Gyeongsan, Republic of Korea.
Sung-Jun
0000-0002-7484-2898
SJ
Kim
Institute of Science & Technology, Megagen Implant, Gyeongsan, Republic of Korea. ; Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, Republic of Korea.
Hyun-Wook
0000-0001-7684-8436
HW
An
Institute of Science & Technology, Megagen Implant, Gyeongsan, Republic of Korea.
Hyun-Seung
0000-0003-2805-0053
HS
Kim
Institute of Science & Technology, Megagen Implant, Gyeongsan, Republic of Korea.
Dong-Guk
0000-0001-8855-7345
DG
Ha
Institute of Science & Technology, Megagen Implant, Gyeongsan, Republic of Korea.
Kyung-Ho
0000-0001-5195-8604
KH
Ryo
MIR Dental Hospital, Daegu, Republic of Korea.
Kwang-Bum
0000-0001-6590-2767
KB
Park
Compressive strength; Deep thread; Dental implant; Insertion torque; Mechanical stability; Primary stability