The clinical success and longevity of restorations depend on a number of factors. Although recurrent or secondary caries has been found to be a major reason for the replacement of existing restorations,1 the materials and techniques employed at the time of restoration are key considerations in determining longevity and clinical success for both direct and indirect restorations. Factors attributed to restoration accuracy, depending on the type of restoration (direct or indirect), have included the degree of clinical expertise; properties of impression, stone and die, and restorative materials; and the conditions under which impressions are taken and restorations completed.
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