Three-dimensional misfit between Ti-Base abutments and implants evaluated by replica technique

Abstract

Three-dimensional misfit between Ti-Base abutments and implants evaluated by replica technique An important factor affecting the biomechanical behavior of implantsupported reconstructions is the implant-abutment misfit. Objective: This study evaluated the misfit between Ti-Base abutments and implants by means of polyvinyl siloxane replica technique using microcomputed tomography (μCT). Methodology: Volumetric and linear (central and marginal) gaps of four Ti-base abutments (n=10/group): (i) Odontofix LTDA (OD), (ii) Singular Implants (SING), (iii) EFF Dental Components (EFF), and (iv) Control Group (S.I.N implants) compatible with an implant system (Strong SW, S.I.N Implants) were measured using μCT reconstructed polyvinyl siloxane replicas. Results: The results showed significantly lower volume gap for Control S.I.N (0.67±0.29 mm 3) and SING (0.69±0.28 mm 3) Ti-base abutments relative to OD (1.42±0.28 mm 3) and EFF groups (1.04±0.28 mm 3) (p<0.033), without significant difference between them (p=0.936). While gap values were homogenous in the central region, EFF presented a significantly higher marginal gap. Accordingly, the Control S.I.N and Singular Ti-base abutments showed improved volumetric and marginal fit relative to Odontofix and EFF. Conclusion: The method of manufacturing abutments influenced the misfit at the implant-abutment interface.

Abutment on Titanium-Base Hybrid Implant: A Literature Review

“…The selected studies are dated from 2013 to 2021. A generic analysis of the various topics analyzed in the manuscripts was performed being subdivided as follows: (1) misfits between the Ti-base abutment/implant and Ti-base abutment/crown (►Table 1); (2) loosening of the abutment or prosthesis screw (►Table 2); (3) crown height x screw stability effect (►Table 3); (4) Ti-base abutment height effect x cement type (►Table 4); (5) tensile and fatigue test (►Table 5); and (6) inflammatory effects of individualized abutments cemented in Ti-base (►Table 6).…”

“…Cardoso et al (2020) 1 Assessed the misfit between Ti-base abutments and implants using the polyvinylsiloxane replica technique using microcomputed tomography Some Ti-base abutments manufactured by companies other than the implant manufacturer may be more unfit Camós-Tena et al (2019) 8 They compared the most appropriate restoration technique to obtain the lowest misfit value between the studied prostheses…”

“…The use of intraoral scanning and the Computer-Aided Design (CAD) and Computer-Aided Manufacturing (CAM) technologies has increased over conventional prosthetic fabrication procedures, due to the practicality and centered on a fully digital workflow for the patient, especially in implant dentistry. 1 Loosening of the abutment or loosening of the occlusal screw is the most common technical complication, followed by loss of crown retention and screw and abutment fracture. Consequently, current research in implant dentistry is focused on improving prosthetic longevity and ease.…”

“… 3 Implant abutments that are adapted for CAD/CAM use, such as the Ti-base, allow the digital design and milling of customized restorations to be extraorally cemented and screw-retained to the implant. 1 4 Furthermore, currently the most common CAD/CAM systems have a growing database library for rapid fabrication of prostheses on Ti-base 3 abutments. The advantages of this technique include customization of the emergence profile, time efficiency with cost reduction, hybrid retention mechanism (cemented and screwed) that allows removal of excess cement, and improved light curing of the restoration margins before screwing.…”

A comparative biomechanical study of original and compatible titanium bases: evaluation of screw loosening and 3D-crown displacement following cyclic loading analysis

“… 1 2 3 4 Components produced by different manufacturers are made with different machining microtolerances, resulting in design/dimensional accuracy discrepancies. 5 Misfit can be defined as a 3D gap between a titanium base and an implant 6 7 and can lead to micromotion, 8 causing wear of the mating surfaces 9 and screw loosening. 1 4 10 Thus, an indicator of implant-abutment connection stability is maintenance of the reverse torque value (RTV) during cyclic loading.…”