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. 2021 Jan-Mar;21(1):99-105.
doi: 10.4103/jips.jips_463_19.

Comparative evaluation of frictional resistance of extracoronal attachments of different designs and lengths in fixed partial denture: A finite element analysis

Minal Sanjay Kumthekar  1 , Pronob Kumar Sanyal  1 , Shivsagar Tewary  1
Affiliations

Comparative evaluation of frictional resistance of extracoronal attachments of different designs and lengths in fixed partial denture: A finite element analysis

Minal Sanjay Kumthekar et al. J Indian Prosthodont Soc. 2021 Jan-Mar.

Abstract

Aim: The purpose of the study was to evaluate the frictional resistance and the vertical force required to achieve the frictional resistance for different length and designs of extracoronal attachments used in fixed partial denture (FPD).

Setting and design: Finite element analysis.

Materials and methods: Four different designs and five different lengths (3 mm, 3.5 mm, 4 mm, 4.5 mm, and 5 mm) of extracoronal attachments for FPD were selected from different manufacturers. Three-dimensional models of all the samples were simulated using Catia V5 software. The properties were incorporated to the software to simulate the clinical conditions. The frictional resistance and the vertical force required to achieve frictional resistance were analyzed using ANSYS workbench 15.0 finite element software.

Statistical analysis used: ANOVA and Tukey's post hoc test.

Results: The mean microhardness of the Variolink N resin cements were significantly higher than Panavia SA ones (P < 0.001). Variolink N cements exhibited lower sorption/solubility than Panavia SA resin cements (P < 0.05). The ceramic shade had a significant influence on the microhardness of both cements (P < 0.001) but had no significant effect on the sorption/solubility of resin cements (P > 0.05).

Conclusion: Interposition of monolithic zirconia decreases the microhardness of resin cement especially Panavia SA. The microhardness decreased in Variolink N with the increase in the chroma saturation of ceramics. However, in Panavia SA, it was altered by the shades. For both cements, there were no statistical differences between the sorption/solubility. There was a reverse correlation between microhardness and water sorption/solubility of both cements.

Keywords: Attachments; fixed dental prosthesis; force; frictional resistance; length and design of attachment.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
Schematic representation of all attachment designs: (a) PH Conix-PH Intrax, (b) Preci-Vertix standard and Preci-Vertix P(45° inclination), (c) Vario-Soft 3 conical bridge
Figure 2
Figure 2
Different designs of attachment (male and female components): (a) Preci-Vertix P, (b) Preci-Vertix standard, (c) Vario-Soft 3 conical bridge, (d) PH Conix-PH Intrax
Figure 3
Figure 3
CAD designs of all the four attachments (male and female components): (a) Preci-Vertix P, (b) Preci-Vertix standard, (c) Vario-Soft 3 conical bridge, (d) PH Conix-PH Intrax
Figure 4
Figure 4
Finite-element analysis for all designs for all lengths: (a) Preci-Vertix standard, (b) Preci-Vertix P, (c) Vario-Soft 3 conical bridge, (d) PH Conix- PH Intrax
Figure 5
Figure 5
Graphical representation of descriptive statistics for frictional resistance among the four groups
Figure 6
Figure 6
Graphical representation of descriptive statistics for force among the four groups
Figure 7
Figure 7
Graphical representation of force at various lengths among the four groups
Figure 8
Figure 8
Graphical representation of frictional resistance at various lengths among the four groups
Figure 9
Figure 9
Effect of long-span fixed dental prosthesis with and without the use of attachments on force application: (a) without the use of attachment, (b) with the use of attachment
See this image and copyright information in PMC

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