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Brazilian Dental Journal

Print version ISSN 0103-6440On-line version ISSN 1806-4760

Abstract

BORDIN, Dimorvan; CURY, Altair Antoninha Del Bel  and  FAOT, Fernanda. Influence of Abutment Collar Height and Implant Length on Stress Distribution in Single Crowns. Braz. Dent. J. [online]. 2019, vol.30, n.3, pp.238-243.  Epub June 03, 2019. ISSN 0103-6440.  http://dx.doi.org/10.1590/0103-6440201902533.

This in silico study evaluated the influence of the abutment collar height and implants length on the biomechanical behavior of morse taper single dental implants with different crown-to-implant ratio. Six virtual models were constructed (S11, M11, L11, S13, M13 and L13) by combining short (S: 2.5 mm), medium (M: 3.5 mm) or long (L: 4.5 mm) abutment collar heights with different implant lengths (11 or 13-mm). An upper central incisor of 11-mm height was constructed on top of each abutment. Each set was positioned in a virtual bone model and exported to analyze mathematically. A 0.60-mm mesh was created after convergence analysis and a 49 N load was applied to the cingulum of the crown at an angle of 45°. Load-generated stress distribution was analyzed in the prosthetic components according to von Mises stress criteria (σvM) and in the cortical and cancellous bone by means of shear stress (εmax). The use of longer collar abutments (L11) increased the stress on the abutment by 250% and resulted in 40% higher stresses on the screw and 92% higher cortical shear stresses compared to short collared abutments (S11). Increasing the implant length produced a slight stress reduction on cortical bone. Cancellous bone was not affected by the crown-to-implant ratio. Longer abutment collars concentrate stresses at the implant level and cortical bone by increasing the crown-to-implant ratio.

Keywords : dental implants; prosthetic abutments, finite element analysis, single dental implants, anterior single crowns.

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