Methods: A total of 50 pairs of Class I restorations were placed in 32 adult patients in a self-macthing prospective clinical trial. The paired teeth were divided into Synergy Compact/One Coat (SC) group and TPH Spectrum/XenoIII (TS) group according to random number table. Application of the materials followed the manufacture's instructions. The restorations were evaluated by two independent evaluators using U.S. Public Health Service (USPHS)-Ryge modified criteria. Statistical analysis was performed using Wilcoxon rank sum test.
Results: After 3 years, 40 pairs of restorations were available for evaluation. Four TS and two SC restorations failed due to fracture. Only one TS restored tooth showed postoperative sensitivity at baseline and the symptom disappeared a week later. Alfa ratings of TS vs that of SC restorations were as follows: 95% vs 98% for color match, 85% vs 88% for marginal integrity, 88% vs 90% for anatomical form, 85% vs 83% for marginal discoloration, 88% vs 93% for occlusal contact. For both materials, Alfa ratings were 88% for surface texture. There were no statistically significant differences between the two restorative materials for any parameters evaluated (P>0.05).
Conclusion: The 3-year clinical performances of the two restorative materials were satisfactory and not significantly different for each of the parameters evaluated.
Clinical Trial Registration Number: 20050218013