Other variables could be further analysed as secondary outcomes, such as techniques performing time among operators, impact of the socio-economic characteristics on restorations' longevity, and restorations' type impact on the antagonist tooth. Comparisons between groups will be addressed using the Kaplan-Meier survival test as well as Long-Rank test. Cox Regression will be used to enable the assessment of other variables' influence in the results. Significance value of 5% will be adopted for all analysis.