Ceramic strengthening by tuning the elastic moduli of resin-based luting agents.
Dent Mater
; 33(3): 358-366, 2017 03.
Article
in En
| MEDLINE
| ID: mdl-28174009
ABSTRACT
OBJECTIVE:
Resin-based luting agents (RBLAs) with tuned elastic moduli (E) were prepared and their influence on the strengthening, reliability, and mode of failure of luted feldspar ceramic was investigated.METHODS:
RBLAs with low E (2.6GPa), intermediate E (6.6GPa), and high E (13.3GPa) were prepared and used to coat acid-etched ceramic disks. Positive (untreated ceramic) and negative (acid-etched ceramic) control groups were tested. The response variables (n=30) were biaxial flexural strength (σbf, MPa), characteristic strength (σ0, MPa), and Weibull modulus at the ceramic surface (z=0) and luting agent surface (z=-t2). A 3D finite element analysis simulated the biaxial flexural test. Fractographic analysis and morphology of the bonded interfaces were analyzed using scanning electron microscopy.RESULTS:
The RBLAs improved σbf and σ0 at z=0, particularly those with intermediate and high E, whereas the mechanical reliability was only affected in the negative control. At z=-t2, differences between all RBLAs were observed but the structural reliability was independent of the RBLA tested. Increasing E of the RBLA was associated with increased stress concentration at the RBLA and reduced stresses reaching the ceramic. Failures originated on the ceramic surface at the ceramic-cement interface. In the high E group, failure sometimes originated from the RBLA free surface. All RBLAs completely filled the ceramic irregularities.SIGNIFICANCE:
Increased E of the RBLA reduced the variability of strength, the stress reaching the ceramic structure, and sometimes altered the origin of failure. The use of high E RBLAs seems beneficial for luting feldspar ceramics.Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ceramics
/
Resin Cements
/
Dental Cements
Language:
En
Journal:
Dent Mater
Journal subject:
ODONTOLOGIA
Year:
2017
Document type:
Article
Affiliation country:
Brazil