J Adv Prosthodont.  2024 Jun;16(3):163-173. 10.4047/jap.2024.16.3.163.

Effect of storage time on chemical structure of a single-bottle and a two-bottle experimental ceramic primer and microshear bond strength of composite to ceramic

• Naghili A
• Ghasemi A
• Ghasemi A
• Panahandeh N

• KMID: 2557474
• DOI: http://doi.org/10.4047/jap.2024.16.3.163

Abstract

PURPOSE
This study assessed the effect of storage time on chemical structure of a single-bottle and a two-bottle experimental ceramic primer and micro-shear bond strength (µSBS) of composite to ceramic.
MATERIALS AND METHODS
This study was conducted on 60 sintered zirconia and 60 feldspathic porcelain blocks. Half of the specimens (n = 30) were subjected to surface treatment with the single-bottle Clearfil ceramic primer (n = 15) and two-bottle experimental primer (n = 15) after 24 hours. The remaining half received the same surface treatments after 6 months storage in distilled water. Composite cylinders were bonded to the ceramics, and they were then subjected to µSBS test. Also, the primers underwent Fourier-transform infrared spectroscopy (FTIR) after 24 hours and 6 months to assess their chemical structure. Data were analyzed with 3-way ANOVA and adjusted Bonferroni test (alpha = 0.05).
RESULTS
The µSBS of both ceramics significantly decreased at 6 months in one-bottle ceramic primer group (P = .001), but it was not significantly different from the two-bottle experimental primer group (P = .635). FTIR showed hydrolysis of single-bottle primer, cleavage of silane and 10-MDP bonds, and formation of siloxane bonds after 6 months.
CONCLUSION
Six months of storage caused significant degradation of singlebottle ceramic primer, and consequently had an adverse effect on µSBS.

Keyword

Shear strength; Dental porcelain; Zirconium oxide; Methacryloxypropyltrimethoxysilane; Methacryloyloxydecyl dihydrogen phosphate