Abstract
Objective:The aim was to assess the influence of Er, Cr: YSGG laser (ECL) and fractional carbon dioxide laser (FCL) on the shear bond strength (SBS) and microleakage of bioactive restorative material to dentin.Methods:The study was performed in King Saud university in the month of June-July 2019. One hundred and twenty permanent teeth were vertically placed in acrylic resin. Based on the type of surface treatment regime (n=40), samples were divided into three groups. Group-I samples were surface conditioned with total etch and rinse (TE); Group-2 samples were surface treated with Er, Cr: YSGG laser (ECL) and Group-3 specimens were conditioned with fractional carbon dioxide laser (FCL). Surface treatment of dentin was followed by type of bulk fill resin (BFR) application. Tetric-N-Ceram was bonded to dentin conditioned with TE (n=20), FCL (n=20) and ECL (n=20). Similarly, bioactive material (BAM) was also bonded to conditioned surface (n=60). Samples (n=10) among each group were placed in a Universal testing machine. For microleakage testing 5 pairs of samples from each group (n=10) were placed in solution of 2% methylene blue for 24h Fracture analysis was performed using stereomicroscope at 40x magnification. Descriptive statistics i.e., means and standard for SBS and microleakage were compared using analysis of variance (ANOVA) and Tukey’s post hoc test at a significance level of (p < 0.05)Results:The highest SBS scores were displayed by TE-BFR (Bulk filled resin) (19.21 ± 0.925 Mpa) and the lowest shear bond scores were presented by FCL-BFR (11.06±1.611 Mpa). The lowest microleakage scores were exhibited by group ECL-BFR (24.11±13.01nm). Similarly, the highest microleakage score was displayed in group FCL-BAM (42.18±16.32 nm). Admixed failure was pertinent in groups conditioned by ECL. Moreover, groups conditioned with FCL adhesive type of failure was found in abundance.Conclusions:ECL has a potential to be used as an alternate to total etch and rinse for conditioning of dentin when bonded to bioactive materials.
Highlights
The success of the restorative material is dependent on excellent adhesion and reasonable sealing of the cavity walls.[1]
Group-I samples were surface conditioned with total etch and rinse (TE); Group-2 samples were surface treated with Er,Cr:YSGG laser (ECL) and Group-3 specimens were conditioned with fractional carbon dioxide laser (FCL)
shear bond strength (SBS) scores: The highest SBS scores were displayed by TE-bulk fill resin (BFR) (Bulk filled resin) (19.21 ± 0.925 Mpa) and the lowest shear bond scores were presented by FCL-BFR (11.06±1.611 Mpa)
Summary
The success of the restorative material is dependent on excellent adhesion and reasonable sealing of the cavity walls.[1] To find a material with such characteristic, led to the development of resin bulk fill material.[1,2] Bulk fill resin composites were introduced to reduce technique sensitivity by reducing placement time and promoting single phase cure up to the depth of 4mm.[3] Pak J Med Sci March - April 2020 Vol 36 No 3 www.pjms.org.pk 526. Advancement in restorative dentistry has led to the development of bioactive material (BAM) which directly links and recharges itself to changes in oral cavity.[5] BAM is composed of glass particles and resin matrix which facilities diffusion of calcium, phosphate and fluoride ions and neutralizes the oral pH, remineralizes the dentin, exhibits antimicrobial activity and forms a chemical bond improving marginal adaptability decreasing microleakage.[5]
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