The effect of elapsed time following alumina blasting on adhesion of CAD/CAM resin block to dentin

Abstract

The aim of this study was to evaluate the time elapsed bond strength of the CAD/CAM resin block (CRB) to bovine dentin after alumina blasting. CRB (KATANA AVENCIA BLOCK) slices were ground with #600-SiC paper and divided into three groups according to alumina blasting pressure-0.1 MPa, 0.2 MPa or untreated-and then divided into two subgroups according to the time elapsed after alumina blasting-same-day or one-week "dry-storage" at controlled laboratory conditions before cementation. The CRB slices were then cemented to bovine dentin with Panavia V5 (Kuraray Noritake Dental), and divided into two subgroups-light curing or chemical curing. After 24 h storage in distilled water at 37°C, the specimens were then subjected to micro-tensile bond strength (µTBS) testing. One-week group showed a significant decrease in µTBS. The µTBS values showed that CRBs must be cemented with light curing immediately after alumina blasting at 0.1 or 0.2 MPa to obtain a stable adhesion.

Bonding performance of dispersed filler resin composite CAD/CAM blocks with different surface treatment protocols

“…In this study, the RCBs surfaces were polished with diamond paste before the surface pretreatment for surface topographic evaluation aiming to elucidate the effect of HF etching. On the other hand, surface pretreatment for the µTBS was performed for all RCBs after finishing with #600 SiC paper as the standard procedure in previous studies [16][17][18]24) . Surface topography evaluated with 3D-CLSM revealed that both SB and HF increased surface roughness parameters for all RCBs.…”

“…2). Although SB is recommended by manufactures and supporting evidence for SB at low air pressures (0.1 to 0.2 MPa) is available in the literature 11,[16][17][18][19][20][21] , the surface may be damaged and subsurface crack development may compromise restoration long-term durability 23) . Additionally, the exposure of restoration margins to SB could result in clinically unacceptable marginal gaps 24) .…”

“…The physical adsorption is affected by surface topography (roughness) of the substrate 12,14) which will change the surface area and the wettability 15) , subsequently improve its surface energy 12) . Surface pretreatment with sandblasting (SB) is recommended by the manufacturer for all DF-RCBs 11,13,[16][17][18][19][20][21][22] to increase their roughness. SB with 50 µm alumina particles under a controlled air pressure of 0.1-0.2 MPa has been reported as the most effective method for bond durability 16) , but it may affect the fatigue strength and long-term durability of DF-RCBs 23,24) due to the development subsurface cracks (1-10 µm) 23) .…”

“…SB with 50 µm alumina particles under a controlled air pressure of 0.1-0.2 MPa has been reported as the most effective method for bond durability 16) , but it may affect the fatigue strength and long-term durability of DF-RCBs 23,24) due to the development subsurface cracks (1-10 µm) 23) . To promote the chemical adhesion and bonding performance to DF-RCBs, some manufacturers and authors recommend a silane treatment prior to the cementation 17,25) , while others advocate the use of universal adhesives 26,27) . For PICN-RCBs, hydrofluoric acid (HF) is recommended as a pretreatment to roughen the surface and enhance mechanical interlocking.…”

The effect of temporary sealing materials and cleaning protocols on the bond strength of resin cement applied to dentin using the resin-coating technique

“…Cementing CAD/CAM resin disks (1.5 mm in thickness) were fabricated from CERASMART 300 (CAD/CAM resin block, Size 12, A2 LT, GC) by cutting with a low-speed diamond saw (Isomet, Buehler, Lake Bluff, IL, USA). Before cementation, the CAD/CAM resin disks were ground using a 600-grit SiC paper under running water for 60 s, air abraded using a blasting machine (Basic master, Renfert, Hilzingen, Germany) at 0.2 MPa using 50 µm of Al 2O3 for 10 s at an operating distance of 10 mm 24,25) , and ultrasonically cleaned with distilled water.…”