Sample size calculation
Power analysis using G* Power statistical software (ver. 3.0.10, Franz Faul, Universitat Kiel, Germany) was used to calculate the sample size. To achieve an w = 0.50 effect difference between the groups with 90% power and an alpha error of 5%, at least 26 restorations per group were needed. Considering the possibility of dropouts during follow-up, the sample size was increased to at least 50 in each group, and a total of 100 restorations were performed.