Abstract
Shear bond strength between resin cement and lithium disilicate ceramics after different etching protocols, different heat treatments, and intrinsic staining was tested. Lithium disilicate specimens were 10 mm long by 5 mm wide by 2 mm thick and were divided into 5 groups (n=10): Group 1: specimens heated to 840 ºC; Group 2: specimens submitted to double heating treatment (heated to 840 ºC, cooled down, heated to 770 ºC); Group 3: specimens heated to 840 ºC, cooled down, intrinsically stained, heated to 770 ºC; Group 4: specimens heated to 840 ºC, cooled down, heated to 800 ºC; Group 5: specimens heated to 840 ºC, cooled down, intrinsically stained, heated to 800 ºC. Groups 1, 3, and 5 were etched with 10% hydrofluoric acid (HF) and analyzed by scanning electron microscopy (SEM) at 10,000´. Specimens from groups 2 and 4 were not etched with HF. Energy dispersive spectrometry (EDS) and SEM analyzed specimen staining physicochemical changes in groups 3 and 5. The resin cement samples were 1-mm in diameter and 2-mm in height. Analysis of variance and independent t test were used to compare the groups in the study (p<0.05). Different lithium disilicate surface and heat treatments changed specimen topography. No significant effect was found in the adhesion between intrinsically stained lithium disilicate specimens and resin cement (p>0.05). Shear bond strength between resin cement and lithium disilicate ceramics was not influenced by intrinsic staining. Topography of the ceramic material changed with different heating temperatures and with acid etching.
Highlights
The bonded interface between glass ceramics and resin cements plays an important role in the long-term reliability of ceramic restorations
Computer‐aided design and computer‐aided manufacturing (CAD/CAM) could reduce the time needed for restoration fabrication, the prefabricated ceramic blocks are more homogeneous with minimal flaws, and the restorations are favorably compared with conventional ceramic restorations, with high longevity for monolithic crowns (Li et al 2014; Sulaiman et al 2015)
The results support partial acceptance of the tested hull hypothesis since the different ceramic treatment protocols had no significant influence in the bonding with the luting agent
Summary
The bonded interface between glass ceramics and resin cements plays an important role in the long-term reliability of ceramic restorations. Stained ceramics could lose surface integrity and present increased surface roughness with toothbrushing (Bativala et al 1987) Such factors could be minimized with the use of an intrinsic staining technique. It is unclear whether an experimental intrinsic staining technique could influence the bonding between the ceramic material and the luting agent. This in vitro quantitative (Pereira et al 2018) study tested the shear bond strength between resin cement and lithium disilicate ceramics after different etching protocols, different heat treatments, and intrinsic staining. The tested hull hypothesis was that the different ceramics treatment protocols would not significantly influence bonding with the luting agent nor the ceramic material surface characteristics
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
