THE BOND STRENGTH OF COMPOSITE MATERIALS TO DENTIN UNDER DIFFERENT PROTOCOLS OF ITS PREPARATION AND ADHESIVE TREATMENT
DOI:
https://doi.org/10.32782/2786-7684/2025-3-10Keywords:
dentistry, teeth, dental caries, preparation, air abrasion, bond strength, adhesionAbstract
Introduction. Methods of preliminary dentin surface treatment before tooth restoration play a key role in ensuring strong adhesion of restorative materials to hard dental tissues, which affects the long-term retention of restorations. Despite numerous studies, the effectiveness of different dentin preparation and adhesive protocols remains controversial. Aim of the study. To determine the tensile bond strength between restorative material and dentin using different preparation and adhesive protocols. Materials and methods. In 20 extracted third molars, the enamel was ground to expose the dentin. Samples were divided into 4 groups (n = 5). Groups 1 and 2 were prepared using rotary instruments; groups 3 and 4 – by air-abrasion. In groups 1 and 3, no etching was performed; in groups 2 and 4, dentin was etched with phosphoric acid gel. All samples were treated with Charisma GLUMA® Bond 5 adhesive and Charisma “SMART” composite. Tensile bond strength was measured using a UM-500 testing machine. Statistical analysis was performed in STATA 19 using ANOVA and Bonferroni test. Results. The lowest bond strength was found in non-etched samples. Significantly higher values were recorded after preliminary etching. The difference between etched and non-etched groups was statistically significant (p < 0.05). No significant difference was found between etched groups prepared by different methods (p > 0.05). The combined effect of preparation and adhesive protocols accounted for 83.3% of total variance. Conclusions. Combining acid etching with either air-abrasion or rotary preparation ensures high bonding. Air-abrasion with etching showed the highest strength, but this advantage over the rotary protocol was not statistically significant.
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