CLINICAL EVALUATION OF MICROHYBRID COMPOSITES IN NON-CARIOUS CERVICAL LESIONS: 24-MONTH RESULTS

Objectives: The aim of this study was to evaluate the clinical performance of two different microhybrid composite resins in noncarious cervical lesions after 24 months.
Methods: A total of 97 non-carious cervical lesions were restored with either TPH Spectrum (n=48) or Filtek Z250 (n=49) using an etch&rinse adhesive (Adper Single Bond 2) at 20 patients (12 males and 8 females). The restorations were clinically evaluated using modified USPHS(United States Public Health Service) criteria(retention, color match, marginal discoloration, marginal adaptation, surface texture, anatomic form, postoperative sensitivity and secondary caries) 1 week after placement (baseline) and after 6, 12 and 24 months. The survival rates of restorations were calculated by the Kaplan–Meier procedure estimator and log-rank test was used to compare the survival distributions of these restorations (p < 0.05). Statistical analysis was completed using Pearson Chi-square and Fisher’s Exact Test for assessing the difference between the restorative materials (p<0.05). Cochran’s Q test was also employed for evaluating the difference between recall periods of the same restorative material.
Results: The recall rate was 100% at each evaluation period. The retention rates were 100% at six months, 89,6 % and 91,8 % at 12-months, 85,4% and 89,8% at 24-months for TPH and Z250, respectively. TPH showed statistically significant difference in marginal discoloration criteria between baseline and 24 months (p<0.05). Both TPH and Z250 showed statistically significant difference in marginal adaptation criteria between baseline and 24 months (p<0.05).
Conclusions: Over the 24-month period, both microyhbrid resin composites (TPH Spectrum and Filtek Z250) demonstrated acceptable clinical results in noncarious cervical lesions.