Does the fatigue loading frequency affect the lithium disilicate glass ceramic inlay-dentin bond strength?

Author(s)

Trindade, Flavia Zardo ^[1] ; Campos, Fernanda ^[2] ; Marinho, Caroline Cotes ^[2] ; Bottino, Marco Antonio ^[2] ; Valandro, Luiz Felipe ^[3] ; Kleverlaan, Cornelis J. ^{[4, 5]}

Affiliation

^[1] Univ Estadual Paulista, Araraquara Dent Sch, Dept Dent Mat & Prosthodont, UNESP, 1680 Humaita St, BR-14801903 Araraquara, SP - Brazil

^[2] Univ Estadual Paulista, Dept Dent Mat & Prosthodont, UNESP, Inst Sci & Technol, Sao Jose dos Campos Dent Sch, 777 Eng Franscisco Jose Longo Ave, BR-12245000 Sao Jose Dos Campos, SP - Brazil

^[3] Univ Fed Santa Maria, Fac Odontol, Prosthodont Unit, Floriano Peixoto St 1184, BR-97015372 Santa Maria, RG - Brazil

^[4] Univ Amsterdam, Dept Dent Mat Sci, ACTA, Gustav Mahlerlaan 3004, NL-1081 LA Amsterdam - Netherlands

^[5] Vrije Univ, Gustav Mahlerlaan 3004, NL-1081 LA Amsterdam - Netherlands

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES; v. 84, p. 301-306, AUG 2018.
• Web of Science Citations: 1

Abstract

The aim of this study was to verify the effect of loading frequency during mechanical cycling on the microtensile bond strength between tooth and ceramic inlays. Twenty-four extracted permanent maxillary molars were standardly prepared (3 mm wide x 4 mm deep) to receive lithium disilicate-based ceramic inlays. After the adhesive cementation, the restored teeth were divided into three groups (n = 8), according to different range of mechanical cycling frequency: control group - water storage, 2.0 Hz group - mechanical cycling at frequency of 2.0 Hz (0-100 N, 1.2 x 10(6) cycles, water 37 degrees C), and 6.7 Hz group - mechanical cycling at frequency of 6.7 Hz (0-100 N, 1.2 x 10(6) cycles, water 37 degrees C). The teeth were then cut into microbars (1 x 1 mm, non-trimming method), which were tested under microtensile (MTBS) loading. The failure mode was classified and the data were analyzed by one-way ANOVA. The mean bond strength value of the control group was the highest and the values of the cycled groups were 15% lower, however the groups were statistically similar (p = 0.58). Chi-square test showed no statistical difference among the groups regarding the pre-test failures (p = 0.17). For all groups, the most frequent failure type was mode 1 (adhesive at the interface ceramic/cement) and mode 2 (mixed failure). Loading frequencies up to 6.7 Hz had no effect on the lithium disilicate glass ceramic inlay-dentin bond strength. (AU)

• FAPESP's process: 10/07237-8 - Effect of mechanical cycling on the resistance of union of ceramic inlays of different composition, microstructure and processing
• Grantee: Flávia Zardo Trindade
• Support Opportunities: Scholarships in Brazil - Doctorate