J Adv Prosthodont.  2015 Dec;7(6):475-483. 10.4047/jap.2015.7.6.475.

Biomechanical three-dimensional finite element analysis of monolithic zirconia crown with different cement type

• Ha SR

• KMID: 2176623
• DOI: http://doi.org/10.4047/jap.2015.7.6.475

Abstract

PURPOSE
The objective of this study was to evaluate the influence of various cement types on the stress distribution in monolithic zirconia crowns under maximum bite force using the finite element analysis.
MATERIALS AND METHODS
The models of the prepared #46 crown (deep chamfer margin) were scanned and solid models composed of the monolithic zirconia crown, cement layer, and prepared tooth were produced using the computer-aided design technology and were subsequently translated into 3-dimensional finite element models. Four models were prepared according to different cement types (zinc phosphate, polycarboxylate, glass ionomer, and resin). A load of 700 N was applied vertically on the crowns (8 loading points). Maximum principal stress was determined.
RESULTS
Zinc phosphate cement had a greater stress concentration in the cement layer, while polycarboxylate cement had a greater stress concentration on the distal surface of the monolithic zirconia crown and abutment tooth. Resin cement and glass ionomer cement showed similar patterns, but resin cement showed a lower stress distribution on the lingual and mesial surface of the cement layer.
CONCLUSION
The test results indicate that the use of different luting agents that have various elastic moduli has an impact on the stress distribution of the monolithic zirconia crowns, cement layers, and abutment tooth. Resin cement is recommended for the luting agent of the monolithic zirconia crowns.

Keyword

Crowns; Dental cement; Dental stress analysis; Finite element analysis; Zirconium

MeSH Terms

Bite Force
Computer-Aided Design
Crowns*
Dental Cements
Dental Stress Analysis
Finite Element Analysis*
Glass
Glass Ionomer Cements
Polycarboxylate Cement
Resin Cements
Tooth
Zinc Phosphate Cement
Zirconium
Dental Cements
Glass Ionomer Cements
Polycarboxylate Cement
Resin Cements
Zinc Phosphate Cement
Zirconium

Figure

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  Fig. 1 Three components of the finite element analysis model. (A) Monolithic zirconia crown, (B) cement layer, (C) prepared tooth. Eight loading points and directions of load applying. (D), (E) three points on the outer inclines of each buccal cusp, three points on the inner inclines of each buccal cusp, and two points on the inner inclines of each lingual cusp.

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  Fig. 2 Maximum principal stress distribution of the monolithic zirconia crown. (A) - (D) Buccal, (E) - (H) lingual, (I) - (L) mesial, (M) - (P) distal view.

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  Fig. 3 Maximum principal stress distribution of the cement layer. (A) - (D) Occlusal, (E) - (H) buccal, (I) - (L) lingual view.

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  Fig. 4 Minimum principal stress distribution of the cement layer. (A) - (D) Occlusal, (E) - (H) buccal, (I) - (L) lingual view.

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  Fig. 5 von Mises stress distribution of the cement layer. (A) - (D) Occlusal, (E) - (H) buccal, (I) - (L) lingual view.

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  Fig. 6 The peak maximum principal stress value in each model. (A) Monolithic zirconia crown, (B) cement layer, (C) abutment tooth.

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  Fig. 7 The peak minimum principal stress value in each model. (A) Monolithic zirconia crown, (B) cement layer, (C) abutment tooth.

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  Fig. 8 The peak von Mises stress value in each model. (A) Monolithic zirconia crown, (B) cement layer, (C) abutment tooth.

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