Bonding effectiveness of self-adhesive and conventional-type adhesive resin cements to CAD/CAM resin blocks. Part 2: Effect of ultrasonic and acid cleaning

Abstract

The present study assessed the effect of ultrasonic and acid cleaning on resin cement bonding to CAD/CAM resin blocks. One of two resin cements, PANAVIA V5 (PV5) or PANAVIA SA CEMENT HANDMIX (PSA), were bonded to one of 24 CAD/CAM blocks (KATANA AVENCIA BLOCK). Each cement group was divided into four subgroups: no cleaning (Ctl), ultrasonic cleaning (Uc), acid cleaning (Ac) and Uc+Ac. Micro-tensile bond strengths (µTBSs) were measured immediately and 1, 3, and 6 months after water storage. Block surfaces after each treatment were analyzed by scanning electron microscopy. Analysis of variance revealed a statistically significant effect for the parameters 'surface treatment' (p<0.001, F=40), 'resin cement' (p<0.001, F=696) and 'water aging' (p<0.001, F=71). The PV5 group exhibited higher µTBS values than the PSA group. Although cleaning after sandblasting was effective in removing residual alumina particles, it did not affect the long-term bonding durability with non-contaminated CAD/CAM resin blocks.

Effect of silane coupling treatment and airborne-particle abrasion on shear bond strength between photo-cured bulk-fill flowable composite resin and silverpalladium-copper-gold alloy using self-adhesive resin cement

“…APA treatment for Ag-Pd-Cu-Au alloy showed a significant increase in the SBS between the cured bulkfill flowable composite resin and the alloy when using self-adhesive cement. However, the SBS between them in absence of APA treatment maintained high values of [16][17][18][19] MPa. Furthermore, silane coupling treatment for the cured bulk-fill flowable composite resin showed no significant effect on the increase of the SBS between them.…”

“…Although APA the metal surface significantly increased the SBS value between metal rod and resin disk which were cemented by self-adhesive resin cement, the experimental groups without APA (Groups 1, 2, and 3) still showed relatively high SBS of [16][17][18] MPa. This result may be attributed to the bonding effectiveness of the carboxylic acid and phosphoric acid monomer contained in the self-adhesive cement.…”

“…Thus, pretreatments including APA and metal primer application could increase the bond strength of selfadhesive resin cement to noble metal. Moreover, APA should be followed by ultrasonic cleaning due to abrasive particles remaining on the rough surfaces of metal restorations and re-polishing of marginal areas of the restorations 16) . Therefore, these pretreatment procedures prolong treatment time, which may be unfavorable in a clinical situation.…”

“…These cements have a short setting time and less technique sensitivity compared with other resin cements needed for pretreatment adhesion. There are many reports about the bond strength between selfadhesive cement and composite resin or ceramics for indirect restoration [14][15][16] ; however, the bond strength between self-adhesive cement and an Ag-Pd-Cu-Au alloy was reported in a few studies. A metal-based indirect restoration is still applied for posterior teeth because an Ag-Pd-Cu-Au alloy is the most reliable material for stressful occlusal surfaces of posterior teeth.…”

Effect of elapsed time after air abrasion on bond strength of luting agent to CAD/CAM resin blocks

“…CAD/CAM composite resin crown restoration systems for premolars were included in the Japanese health insurance system in 2014, after which their use spread rapidly (1,3). However, because of rapid polymerization resulting from the high temperature and pressure of production (4,5), it is not easy to bond these restoration with luting agents, which means there is no unpolymerized layer on the surface. Some Japanese case reports noted desorption (especially early desorption) of CAD/CAM crowns.…”