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. 2018 Apr-Jun;18(2):161-167.
doi: 10.4103/jips.jips_219_17.

Comparative effect of implant-abutment connections, abutment angulations, and screw lengths on preloaded abutment screw using three-dimensional finite element analysis: An in vitro study

Krishna Chaitanya Kanneganti  1 , Dileep Nag Vinnakota  1 , Srinivas Rao Pottem  1 , Mahesh Pulagam  1
Affiliations

Comparative effect of implant-abutment connections, abutment angulations, and screw lengths on preloaded abutment screw using three-dimensional finite element analysis: An in vitro study

Krishna Chaitanya Kanneganti et al. J Indian Prosthodont Soc. 2018 Apr-Jun.

Abstract

Purpose: The purpose of this study is to compare the effect of implant-abutment connections, abutment angulations, and screw lengths on screw loosening (SL) of preloaded abutment using three dimensional (3D) finite element analysis.

Materials and methods: 3D models of implants (conical connection with hex/trilobed connections), abutments (straight/angulated), abutment screws (short/long), and crown and bone were designed using software Parametric Technology Corporation Creo and assembled to form 8 simulations. After discretization, the contact stresses developed for 150 N vertical and 100 N oblique load applications were analyzed, using ABAQUS. By assessing damage initiation and shortest fatigue load on screw threads, the SL for 2.5, 5, and 10 lakh cyclic loads were estimated, using fe-safe program. The obtained values were compared for influence of connection design, abutment angulation, and screw length.

Results: In straight abutment models, conical connection showed more damage (14.3%-72.3%) when compared to trilobe (10.1%-65.73%) at 2.5, 5, and 10 lakh cycles for both vertical and oblique loads, whereas in angulated abutments, trilobe (16.1%-76.9%) demonstrated more damage compared to conical (13.5%-70%). Irrespective of the connection type and abutment angulation, short screws showed more percentage of damage compared to long screws.

Conclusions: The present study suggests selecting appropriate implant-abutment connection based on the abutment angulation, as well as preferring long screws with more number of threads for effective preload retention by the screws.

Keywords: Dental; implant; preload; screw.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
(a) Conical connection with hex (straight abutment-short screw); (b) trilobe connection (straight abutment-long screw)
Figure 2
Figure 2
Casting-assistant device assembly (trilobe connection-straight abutment-short screw)
Figure 3
Figure 3
(a) Meshed model; (b) meshed model-upper part magnified; (c) meshed model-lower part magnified
Figure 4
Figure 4
(a) Von Mises stresses-assembly; (b) Von Mises stresses-bone; (c) Von Mises stresses-implant; (d) Von Mises stresses-abutment; (e) Von Mises stresses-abutment screw
See this image and copyright information in PMC

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