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Abstract
Objectives
Characterisation of the interaction between crack extension, crack stabilisation and stress/strain relaxation in the polymeric matrix, the interplay between stress corrosion cracking and the mechanical response of a resin-based luting adhesive within a surface defect population could extend PLV restoration longevity by optimising cementation protocols. The aim was to investigate the influence of stress corrosion cracking and the viscoelastic behaviour of a resin-based luting adhesive independently by controlling the environmental conditions operative during test specimen fabrication.
Methods
The effects of stress corrosion at ceramic crack tips and potential viscoelastic responses to loading of the resin-coated impregnating cracks were isolated. Resin-coated feldspathic ceramic test specimens were fabricated in ambient humidity or following moisture exclusion. Bi-axial flexure strengths of groups (n = 20) were determined at constant loading rates of 2.5, 10, 40, 160 or 640 N/min and data was compared with uncoated controls. Fractographic analyses were performed on all fractured test specimens.
Results
Resin-cement coating resulted in significant ceramic strengthening in all conditions tested (p < 0.01). A two-way ANOVA demonstrated that the exclusion of moisture during resin- coating significantly increased mean BFS (p<0.01) but post-hoc Tukey tests identified that moisture exclusion resulted in significant increases in BFS values only at intermediate loading rates with no significant differences observed at either the fastest or slowest loading rates (640 and 2.5 N/min, respectively).
Significance
Mechanical reinforcement of PLV materials by resin-cement systems is yet to be optimized. The viscoelastic behavior of the resin-cement itself can influence the magnitude of reinforcement observed and sub-critical crack growth.
Original language | English |
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Pages (from-to) | 498-504 |
Journal | Dental Materials |
Volume | 33 |
Issue number | 5 |
Early online date | 3 Mar 2017 |
DOIs | |
Publication status | Published - 1 May 2017 |
Keywords
- Veneer
- Ceramic
- Cement
- Stress-corrosion
- Strength
Fingerprint
Dive into the research topics of 'The impact of resin-coating on sub-critical crack extension in a porcelain laminate veneer material'. Together they form a unique fingerprint.Projects
- 1 Finished
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Resin Strengthening of Dental Ceramics to Prevent Fracture of Restorations in Service
Addison, O.
Engineering & Physical Science Research Council
5/01/11 → 4/01/12
Project: Research