Comparing degree of 3 different PEEK scanbody deformations when tightening in various torques

Abstract

Background Digital implant impression is able to reduce patient's discomfort and unnecessary laboratory processing. Many studies have also shown that it is not less accurate than conventional impression. The scanbody consists of a base, a body, and a scan region. Among various scanbody materials, titanium and PEEK supplies are widely used. Especially, PEEK, with high biocompatibility, is being used for various dental materials. Aim/Hypothesis The purpose of this study was to investigate the circumstance regarding the collapse of base region when fastening to the implant fixture, which the scanbody consists of PEEK in all three components. The null hypothesis of this study is that there is no difference in the degree of distortion. Materials and Methods The degree of distortion of the base of PEEK scanbody was evaluated in various tightening and recommended torques. The scanbody was fastened to implant fixture in 5Ncm, 10Ncm, 15Ncm, 20Ncm and hand tightening. Then, the degree of damage to the base area was compared by scanning with intraoral scanner. After that, finally, using software called Geomagic Control X, the degree of deformation was evaluated by superimposing with normal scanbody. Results The degree of damage of the scanbody base was the largest in hand tightening, and was in the order of 20Ncm, 15 Ncm, 10 Ncm and 5 Ncm. Also, depending on the products of the three manufacturers, the degree of distortion was different in the base area with same tightening torque. Even though many manufacturers recommend hand tightening, it has shown that it causes the greatest damage to the base area. Conclusion and Clinical Implications Damage to the base of the scanbody will cause errors in tracking the position of the implant fixture, resulting in improper implant prosthesis. As a result of this study, hand tightening, which is the recommended torque of the manufacturer for tightening of PEEK scanbody, causes base damage. Therefore, tightening with a smaller torque is required. It suggests that clinically proper tightening torque of the scanbody should be presented.