Displacement of scan body during screw tightening: A comparative in vitro study
김정한, 손큰바다, 이규복,
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김정한 ( Kim Jung-Han ) - Kyungpook National University School of Dentistry Department of Prosthodontics
손큰바다 ( Son Keunbada ) - Kyungpook National University Graduate School Department of Dental Science
이규복 ( Lee Kyu-Bok ) - Kyungpook National University School of Dentistry Department of Prosthodontics
Abstract
PURPOSE: The purpose of this study was to evaluate the occurrence of displacement while tightening the screw of scan bodies, which were compared according to the material type.
MATERIALS AND METHODS: Three types of scan bodies whose base regions were made up of polyether ether ketone (PEEK) material [Straumann Group, Dentium Group, and Myfit (PEEK) Group] and another scan body whose base region was made up of titanium material [Myfit (Metal) Group] were used (15 per group). The reference model was fabricated by aligning the scan body library on the central axis of the implant, and moving this position by the resin model. The screws of the scan bodies were tightened to the implant fixture with torques of 5 Ncm, 10 Ncm, and a hand tightening torque. After the application of the torque, the scan bodies were scanned using a laboratory scanner. To evaluate the vertical, horizontal, and 3-dimensional (3D) displacements, a 3D inspection software program was used. To examine the difference among groups, one-way analysis of variance and Tukey's HSD post hoc test were used (α=.05).
RESULTS: There were significant differences in 3D, vertical, and horizontal displacements among the different types of scan bodies (P<.001). There was a significantly lower displacement in the Straumann group than in the Myfit (PEEK) and Dentium groups (P<.05).
CONCLUSION: The horizontal displacement in all groups was less than 10 μm. With the hand tightening torque, a high vertical displacement of over 100 μm occurred in PEEK scan bodies (Myfit and Dentium). Therefore, it is recommended to apply a tightening torque of 5 Ncm instead of a hand tightening torque.
키워드
Dental implant; Scan body; Tightening torque; Displacement; Polyether ether ketone (PEEK)
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