Dental Research Journal · Published 2026-01-01 · DOI 10.4103/drj.drj_354_25
Background: Achieving durable bonding for all ceramic restorations will affect its long-term survival in the oral cavity. Dentists may use resin cement after its shelf lifetime, especially in low socioeconomic conditions, which may affect the success and longevity of restorations. The purpose of this in vitro study was to evaluate how the duration of shelf life impacts the shear bond strength (SBS) of lithium disilicate ceramics using light-cured resin cement. Materials and Methods: An in vitro comparative study investigated the impact of resin cement expiry on the SBS of pressed lithium disilicate ceramics. Twenty-four IPS e.max Press discs (4 mm × 2 mm) were randomly divided into two groups: Group I used unexpired light-cured resin cement, and Group II used expired cement. Each disc was bonded to enamel surfaces from sectioned maxillary incisors to create test specimens. Following thermocycling, samples were subjected to a shear force using a universal testing machine until debonding occurred, and the failure load was recorded. Data normality was confirmed with the Shapiro–Wilk test, mean SBS values were compared through independent t-test, and failure modes were assessed using the Chi-square test with Monte Carlo correction at a significance level of P < 0.05. Results: Group I exhibited a higher SBS with a mean value of 24.98 ± 4.01 MPa compared to Group II with a mean value of 20.39 ± 2.72 MPa, with a mean P = 0.008. Conclusion: Expiry date affected the SBS of light-cured resin cement to lithium disilicate ceramic materials. But still the recorded value is higher than the recommended clinical accepted value.
Abstract from DOAJ. Public domain (CC0 1.0).
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