Adhesive strength of bioactive resin for endodontic tooth build up to dentin treated with conventional and contemporary treatments

Aim: The aim of present ex-vivo study was to assess and evaluate the influence of alternative dentinal conditioning methods- Er,Cr:YSGG (ECL) and Photodynamic therapy (PDT) in comparison to traditional etching regimes- Self Etch Resin (SER) and total etch and rinse (TER) on the bond values of Bioactive restorative material (BA) and Multicore (MC) bulk filled resin composite restorations. Material and Methods: Eighty caries free mandibular molars were disinfected and embedded in acrylic resin up to Cemento enamel junction (CEJ). Buccal surfaces of all samples were grounded to depth of 2 mm. Specimens were divided into eight groups (n = 20) based on surface treatment received. Samples in group 1 and 2 conditioned with ECYL, group 3 and 4 pre-treated with methylene blue photosensitizer (MBP), group 5 and 6 surfaces conditioned with TER and samples in group 7 and 8 conditioned with SER. Dentin bonding agent was applied and samples of group 1, 3, 5 and 7 were bonded with BA and 2,4,6,8 bonded to MC. Samples were placed in universal testing machine for SBS testing. Data was assessed using analysis of variance (ANOVA) and Tukey multiple comparisons test. Results: Specimens in group 6 treated with TER and bonded with MC demonstrated maximum SBS (19.61 +/- 0.587 MPa). Whereas, group 3 dentin conditioned to MBP and bonded to BA displayed lowest bond values (12.01 +/- 0.892 MPa). Samples in group 3 and group 4 dentin treated with MBP bonded to MC (13.68 +/- 0.221 MPa) and BA (12.01 +/- 0.892 MPa) displayed comparable bond integrity (p > 0.05) Conclusion: Dentin pre-treated with TER still remains the gold standard. ECYL as an alternative approach to condition dentin has shown potential and can be recommended in clinical settings. MC as bulk fill composite is recommended over BA irrespective of dentine conditioning technique. MBP as dentin conditioner needs further investigation.

Automated summary

This ex-vivo study aimed to evaluate the influence of different dentinal conditioning methods on the bond values of various restorative materials. Results showed that total etch and rinse remains the gold standard, Er,Cr:YSGG showed potential as an alternative, and Multicore bulk fill composite is recommended regardless of dentine conditioning technique. Methylene blue photosensitizer as a dentin conditioner requires further investigation.