Evaluation of Effect of Dietary Solvents on Bond Strength of Compomer, Ormocer, Nanocomposite and Activa Bioactive Restorative Materials

Comparative Evaluation of Shear Bond Strength of Bonded Space Maintainers Using Ormocers, Nanofilled and Glass Fiber-reinforced Adhesive Composites

Background

Space maintainers (SMs) are used to preserve the space created by premature loss of primary teeth. The most commonly used is the band and loop (B&L) SM. As this SM has several drawbacks, such as poor esthetics and gingival health, laboratory procedures for fabrication, and multiple seating procedures, various bonded SMs were introduced. This study aims to compare the shear bond strength of bonded SMs using ormocer, nanofilled, and short glass fiber-reinforced adhesive composites with the conventional B&L SM luted with type I glass ionomer cement (GIC).

Materials and methods

Sixty intact extracted primary molars were randomly divided into four groups (n = 15). In group I (control), conventional B&L SMs were luted with type I GIC, whereas ormocer, nanofilled, and glass fiber-reinforced composites (GFRC) were used to bond the SMs in groups II, III, and IV, respectively. Shear bond strength of all the specimens was analyzed using a universal testing machine, and the obtained data were subjected to statistical analysis.

Results

The highest shear bond strength, that is, 68.82 ± 16.81 MPa, was exhibited by GFRC, followed by 51.04 ± 23.28 MPa with nanofilled composite, 45.3 ± 18.27 MPa with ormocer, and the least in the control group, that is, 42.17 ± 17 MPa.

Conclusion

Glass fiber-reinforced resin composite has better resistance against shear force than the other three study materials, and this was significantly higher (p = 0.001) than conventional B&L SMs.

How to cite this article

Barathi D, Jampanapalli SR, Patloth T, et al. Comparative Evaluation of Shear Bond Strength of Bonded Space Maintainers Using Ormocers, Nanofilled and Glass Fiber-reinforced Adhesive Composites. Int J Clin Pediatr Dent 2024;17(6):695-701.

Reactions of Subcutaneous Connective Tissue to Mineral Trioxide Aggregate, Biodentine®, and a Newly Developed BioACTIVE Base/Liner

AIM

There is an increasing interest in the application of BioACTIVE materials to achieve hard tissue formation and maintain pulp vitality. Mineral trioxide aggregate (MTA) and Biodentine® are BioACTIVE materials used for pulp capping. Recently, dental researchers have produced BioACTIVE glass-incorporated light-curable pulp capping material. The study is aimed at evaluating the subcutaneous connective tissue reactions to MTA, Biodentine®, ACTIVA BioACTIVE Base/Liner. These materials were placed in polyethylene tubes and implanted into the dorsal connective tissue of Sprague Dawley rats. The presence of inflammation, predominant cell type, calcification, and thickness of fibrous connective tissue was recorded by histological examination 7, 30, and 60 days after the implantation procedure. Scores were defined as follows: 0 = none or few inflammatory cells, no reaction; 1 = <25 cells, mild reaction; 2 = 25 to 125 cells, moderate reaction; and 3 = ≥125 cells, severe reaction. Fibrous capsule thickness, necrosis, and formation of calcification were recorded. ANOVA and post hoc Dunnett's tests were used for statistically analyses (p < 0.05).

RESULTS

In terms of oedema, inflammation, fibrous capsule, and necrosis, no significant differences were found in any time period for any material. MTA and Biodentine® showed higher calcification than in the ACTIVA BioACTIVE on day 30, and the difference was statistically significant (p < 0.05). After 60 days, while calcification was not seen in the control group, it was observed in the test groups. There was a statistically significant difference between the control and the others.

CONCLUSION

All materials were well tolerated by the tissues in the 60-day evaluation period. One notable finding is the presence of dystrophic calcification in the connective tissue adjacent to the newly developed BioACTIVE Base/Liner material. Therefore, this new BioACTIVE Base/Liner material may be safely recommended to clinicians as a pulp capping material.