Influence of diameter on mechanical behavior of morse taper narrow implants

Reis, Taís Alves dos; Borges, Giovanna Chaves Souza; Zancopé, Karla; Neves, Flávio Domingues das

doi:10.20396/bjos.v21i00.8666036

Cited by 1 publication

(2 citation statements)

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“…A static loading test was conducted at a speed of 1.0 mm/min to determine the maximum load [ 17 ]. A flexural load was applied to the implant–abutment assemblies at a rate of 0.5 mm/s [ 18 ].…”

Section: Methodsmentioning

confidence: 99%

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Mechanical Behavior of One-Piece and Two-Piece Tapered Prosthetic Abutments with 11.5 and 16 Degrees

et al. 2023

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The objective of this study is to examine the mechanical behavior of two-piece abutments (Morse taper with 16° internal angulation and Morse taper with 11.5° internal angulation) before and after cyclic fatigue testing, following ISO 14801:2016 guidelines. The specimens were divided into three groups: a modified Morse taper with a taper angle of 16° (GM group), a conventional Morse taper (taper angle of 11.5° deg) with a two-piece (CMt group), and one-piece abutments (CMo group). Each experimental group was formed by ten implants and ten abutments (n = 10) for a total of 30 specimens (n = 30). The abutments were tightened and loosened, and a fatigue test was applied with 15 Hz and 5 × 106 cycles. Subsequently, the abutments were loosened, and a pull-out test was performed on the CMt group. Finite element analysis (FEA) was conducted on stress concentration regions. The statistical analysis of the loosening test was performed using two-way ANOVA and Tukey’s tests (p < 0.05) to compare screw loosening within each group and between the groups with and without mechanical fatigue. Significant differences were found among the three groups in the loosening test when analyzing the values with and without fatigue (p < 0.001) within each group. When the groups were compared with each other, there was also a significant difference between them (p < 0.001), except between groups GM and CMt without fatigue (p = 0.840). In the pull-out test of the CMt group, the sample exhibited frictional locking only after fatigue (mean = 94.2 N). The FEA demonstrated a varied stress distribution in all groups. The stress was found to be more concentrated in the upper third and middle third regions of the implant, as well as in the opposite region of the load application for all three groups. Although the CMo group showed lower rates of loosening, it displayed a poorer stress distribution in comparison to the GM and CMt groups. On the other hand, the CMt group exhibited a satisfactory frictional lock after undergoing the fatigue tests.

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Section: Methodsmentioning

confidence: 99%

“…The tensile strength (N) required for abutment removal was measured at a speed of 5 mm/min [ 16 , 17 ], and the data obtained were analyzed with computer software (MultiTest 2.5 XT, ; Mecmesin, Sterling, VA, USA) [ 16 ]. The pull-out test was described by the mean and standard deviation (SD) before and after mechanical fatigue.…”

Section: Methodsmentioning

confidence: 99%