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Recommendations for conducting controlled clinical studies of dental restorative materials. Science Committee Project 2/98--FDI World Dental Federation study design (Part I) and criteria for evaluation (Part II) of direct and indirect restorations including onlays and partial crowns.Reinhard Hickel, Guido Vanherle, Martin J. Tyas et al.|PubMed|2007Cited by 193
Clinical effectiveness of direct anterior restorations—A meta-analysisSiegward D. Heintze, Reinhard Hickel, Valentin Rousson|Dental Materials|2015Cited by 184