Abstract
Background. Screw-retained restorations are favored in some clinical situations such as limited inter-occlusal spaces. This study was designed to compare stresses developed in the peri-implant bone in two different types of screw-retained restorations (segmented vs. non-segmented abutment) using a finite element model. Methods. An implant, 4.1 mm in diameter and 10 mm in length, was placed in the first molar site of a mandibular model with 1 mm of cortical bone on the buccal and lingual sides. Segmented and non-segmented screw abutments with their crowns were placed on the simulated implant in each model. After loading (100 N, axial and 45° non-axial), von Mises stress was recorded using ANSYS software, version 12.0.1. Results. The maximum stresses in the non-segmented abutment screw were less than those of segmented abutment (87 vs. 100, and 375 vs. 430 MPa under axial and non-axial loading, respectively). The maximum stresses in the peri-implant bone for the model with segmented abutment were less than those of non-segmented ones (21 vs. 24 MPa, and 31 vs. 126 MPa under vertical and angular loading, respectively). In addition, the micro-strain of peri-implant bone for the segmented abutment restoration was less than that of non-segmented abutment. Conclusion. Under axial and non-axial loadings, non-segmented abutment showed less stress concentration in the screw, while there was less stress and strain in the peri-implant bone in the segmented abutment.
Highlights
Implant-supported prostheses have been widely used in recent decades because of their promising esthetic, functional and biological outcomes.[1]
Screw-retained restorations are favored in some clinical situations such as limited inter-occlusal spaces
The maximum stress and Strain value in the periimplant bone, and in segmented and non-segmented abutment screws were evaluated and compared (Table 2). In both models and under each loading condition, maximum stress concentration was detected around the neck of the implants
Summary
Implant-supported prostheses have been widely used in recent decades because of their promising esthetic, functional and biological outcomes.[1]. Implant-supported prostheses are categorized into two major types; screw-retained and cement-retained restorations. Each type of restoration has some advantages,[6,7] their selection is mostly based on the clinician’s preference.[8] According to Heckmann et al[9] there is no difference between the precision of fit of these two types of restorations. The stress developed in the peri-implant bone supporting screw-retained and cement-retained restorations was reported to be similar.[9]. Screw-retained restorations are favored in some clinical situations such as limited inter-occlusal spaces. This study was designed to compare stresses developed in the peri-implant bone in two different types of screw-retained restorations (segmented vs non-segmented abutment) using a finite element model
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