Influence of buccal cusp reduction when using porcelain laminate veneers in premolars. A comparative study using 3-D finite element analysis

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• 作者：Carlos Marcelo  ; Archangelo PhD^a ; Eduardo Passos  ; Rocha PhD^b ;   ; ^{eduardo_rocha@foa.unesp.br} ; Rodolfo Bruniera  ; Anchieta MS^b ; Manoel  ; Martin Jr. PhD^a ; Amilcar Chagas  ; Freitas Jr. MS^b ; Ching-Chang  ; Ko PhD^c ; Paolo M.  ; Cattaneo PhD^d
• 关键词：Laminate veneers ; Dental Ceramics ; Finite element analysis ; Numerical analyses
• 刊名：Journal of Prosthodontic Research
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：55
• 期：4
• 页码：221-227
• 全文大小：1113 K

文摘

Objectives

Based on a maxillary premolar restored with laminate veneer and using the 3-D finite element analysis (FEA) and ¦ÌCT data, the aim of this study was to evaluate the influence of different types of buccal cusp reduction on the stress distribution in the porcelain laminate veneer and in the resin luting cement layer.

Methods

Two 3-D FEA models (M) of a maxillary premolar were built from ¦ÌCT data. The buccal cusp reduction followed two configurations: Mt ?buccal cusp completely covered by porcelain laminate veneer; and Mp ?buccal cusp partially covered by porcelain laminate veneer. The loading (150 N in 45¡ã) was performed on the top of the buccal cusp. The finite element software (Ansys Workbench 10.0) was used to obtain the maximum shear stress (¦Ó_max) and maximum principal stress (¦Ò_max).

Results

The Mp showed reduced the stress (¦Ò_max) in porcelain laminate veneer (from ?.3 to 24.5 MPa) in comparison with Mt (from ?.3 to 27.4 MPa). The difference between the peak and lower stress values of ¦Ò_max in Mp (?.8 to 26.7 MPa) and Mt (?.3 to 27.4 MPa) was similar for the resin luting cement layer. The structures not exceeded the ultimate tensile strength or the shear bond strength.

Conclusions

Cusp reduction did not affect significant increase in ¦Ò_max and ¦Ó_max. The Mt showed better stress distribution (¦Ó_max) than Mp.