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KMID : 1004520140300030206
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Journal of Dental Rehabilitation and Applied Science
2014 Volume.30 No. 3 p.206 ~ p.214
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Influence of bearing surface angle of abutment screw on mechanical stability of joint in the conical seal design implant system
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Kim Joo-Hyeun
Huh Jung-Bo
Yun Mi-Jung
Kang Eun-Sook
Heo Jae-Chan
Jeong Chang-Mo
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Abstract
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Purpose: This study is to evaluate how different bearing surface angles of abutment screw affect the mechanical stability of the joint in the conical seal design implant system.
Materials and Methods: Internal connection type regular implants, two-piece cemented type abutments and tungsten carbide/carbon-coated titanium alloy abutment screws were selected. Titanium alloy screws with conical (45°) and flat (90°) head designs which fit on to abutment were fabricated. The abutments were tightened to implants with 30 Ncm by digital torque gauge. The loading was applied once to the central axis of abutment. The mean axial displacement was measured using micrometer before and after the tightening and loading (n = 5). The abutment was tightened to implants with 30 Ncm and T-shape stainless steel crown was cemented. Then the change in the amount of reverse-torque was measured after the repeated loading to the central axis, and the place 5 mm away from the central axis. Compressive bending and fatigue strength were measured at the place 5 mm away from the central axis (n = 5).
Results: Both groups showed the largest axial displacement when abutment screw tightening and total displacement was greater in the flat head group compared to conical head group (P < 0.05). However, there were no significant differences in reverse torque value, compressive bending and fatigue strength (P > 0.05).
Conclusion: Within the limitations of this study, the abutment screw head design had no effect on two groups regarding the joint stability, however the conical head design affected the settlement of abutment resulting in the reduced total displacement.
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KEYWORD
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implant, abutment screw, settling effect, joint stability, removal torque
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