Shear bond strength evaluation of resin composite bonded to three different liners: TheraCal LC, Biodentine, and resin-modified glass ionomer cement using universal adhesive: An in vitro study.
OBJECTIVE
To compare and evaluate the bonding ability of resin composite (RC) to three different liners: TheraCal LC™ (TLC), a novel resin-modified (RM) calcium silicate cement, Biodentine™ (BD), and resin-modified glass ionomer cement (RMGIC) using an universal silane-containing adhesive and characterizing their failure modes.


METHODS
Thirty extracted intact human molars with occlusal cavity (6-mm diameter and 2-mm height) were mounted in acrylic blocks and divided into three groups of 10 samples each based on the liner used as Group A (TLC), Group B (BD), and Group C (RMGIC). Composite post of 3 mm diameter and 3 mm height was then bonded to each sample using universal adhesive. Shear bond strength (SBS) analysis was performed at a cross-head speed of 1 mm/min.


METHODS
Statistical analysis was performed with one-way analysis of variance (ANOVA) and post hoc test using Statistical Package for the Social Sciences (SPSS) version 20.


RESULTS
No significant difference was observed between group A and group C (P = 0.573) while group B showed the least bond strength values with a highly significant difference (P = 0.000). The modes of failure were predominantly cohesive in Groups A and B (TLC and BD) while RMGIC showed mixed and adhesive failures.


CONCLUSIONS
Hence, this present study concludes that the bond strength of composite resin to TLC and RMGIC was similar and significantly higher than that of BD following application of universal adhesive.
Department of Conservative Dentistry and Endodontics, Lenora Institute of Dental Sciences, Rajahmundry, Andhra Pradesh, India.
Velagala L
VL
Deepa
Department of Conservative Dentistry and Endodontics, Lenora Institute of Dental Sciences, Rajahmundry, Andhra Pradesh, India.
Bhargavi
B
Dhamaraju
Department of Conservative Dentistry and Endodontics, St. Joseph Dental College, Andhra Pradesh, India.
Indira Priyadharsini
IP
Bollu
Department of Conservative Dentistry and Endodontics, Lenora Institute of Dental Sciences, Rajahmundry, Andhra Pradesh, India.
Tandri S
TS
Balaji
Biodentine™ (BD); TheraCal LC™ (TLC); failure modes; resin-modified glass ionomer; stereomicroscope; universal adhesive