Abstract
The purpose of this study was to evaluate the effect of one week of Computer-aided design/Computer-aided manufacturing (CAD/CAM) crown storage on the μTBS between resin cement and CAD/CAM resin composite blocks. The micro-tensile bond strength (μTBS) test groups were divided into 4 conditions. There are two types of CAD/CAM resin composite blocks, namely A block and P block (KATANA Avencia Block and KATANA Avencia P Block, Kuraray Noritake Dental, Tokyo, Japan) and two types of resin cements. Additionally, there are two curing methods (light cure and chemical cure) prior to the μTBS test—Immediate: cementation was performed immediately; Delay: cementation was conducted after one week of storage in air under laboratory conditions. The effect of Immediate and Delayed cementations were evaluated by a μTBS test, surface roughness measurements, light intensity measurements, water sorption measurements and Scanning electron microscope/Energy dispersive X-ray spectrometry (SEM/EDS) analysis. From the results of the μTBS test, we found that Delayed cementation showed significantly lower bond strength than that of Immediate cementation for both resin cements and both curing methods using A block. There was no significant difference between the two types of resin cements or two curing methods. Furthermore, water sorption of A block was significantly higher than that of P block. Within the limitations of this study, alumina air abrasion of CAD/CAM resin composite restorations should be performed immediately before bonding at the chairside to minimize the effect of humidity on bonding.
Highlights
Zirconia and resin composites are the materials used for the fabrication of dental restorative and prosthetic devices based on computer-aided design and computer-aided manufacturing (CAD/CAM) technology in dentistry
The specimens were divided into two subgroups according to the time passed after alumina air abrasion and prior to the μTBS test—Immediate: cementation was performed immediately; Delay: cementation was conducted after one week of storage in air under laboratory conditions, where the temperature was set to 23.0 ± 0.5 ◦ C and the relative humidity (RH) was 50 ± 5% [9]
It was hypothesized that the direct application of a silane primer would provide a higher bond strength than using the newly developed self-adhesive resin cement containing a silane coupling agent; previous studies have recommended multi-step procedures improve the performance of adhesives [25,26]
Summary
Technology of computer-aided design and computer-aided manufacturing (CAD/CAM). Has remarkably progressed and is becoming popular in medicine, dentistry and industry. Zirconia and resin composites are the materials used for the fabrication of dental restorative and prosthetic devices based on CAD/CAM technology in dentistry. CAD/CAM technology has been utilized to fabricate indirect restorations from CAD/CAM resin composite blocks (CRBs) with differing compositions. CRBs are industrially polymerized and are expected to have an even better polymerization ratio in comparison to laboratory-fabricated indirect resin composite [1,2,3,4,5,6]
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