Results
tightness
PCT
A sample consisted of 72 patients, accounting for total of 72 restorations; none of them reported contact sites inconveniences after 12 months with no dropout. No statistically significant difference was found between patients in regards of demographic distribution as shown in Table 
Demographic distribution of study participants0.908(0.442)0.635(0.888)1.063(0.786)Both mean values and the standard deviation values of PCT at different follow up intervals among different matrix types are presented in Table 
Comparison of proximal contact tightness (PCT) at different follow up intervals among different matrix typesDifferent superscript lowercase letters denote statistically significant difference between study groupsDifferent superscript uppercase letters denote statistically significant difference between time points within each study group
Pairwise comparison of PCT between different matrix types*Statistically significant at After restoration, a follow-up period of 12-month was performed and the PCT was considerably reduced and reached the PCT between the natural teeth. The PCT alterations between the restored teeth and adjacent teeth at T0, T1, T2, T3, T4 and T5 are shown in Fig. 
The PCT alterations between the restored teeth and neighboring teeth at T0, T1, T2, T3, T4 and T5