Hosny Bakheet Abdel-Rahman Enas Fathelbab Abdel-Halim And Shams Waaz Amgad,

ABSTRACT

Objectives: The Aim Of This Study Was To Evaluate The Marginal Accuracy Of Machinable Ceramics Luted With Different Resin Cements.

Materials & Methods: Forty Full Contoured Anatomical Crowns Were Constructed From Two Different CAD/CAM Ceramic Materials (Zirconzahn And IPS E.max CAD). Specimens Were Divided Into Two Groups (twenty Crowns Of Each) According To The Used Ceramic Material. Each Group Was Then Subdivided Into 2 Subgroups According To The Type Of The Luting Cement Used (self-adhesive Resin Cement And Resin Modified Glass Ionomer Cement). Crowns Luted To Their Corresponding Prepared Epoxy Dies With The Selected Cement Type. Specimens Were Subjected To Thermocycling. Marginal Gap Of Each Crown Was Measured By Direct Viewing Under Computer-aided Stereomicroscope At 45? Magnification. Each Crown Was Then Vertically Sectioned. The Surface Of Each Section Was Digitally Photographed Under Computer Aided Stereomicroscope At 9 Reference Points. Marginal And Internal Gap Mean Values Were Collected, Tabulated And Statistically Analyzed.

Results: Lithium Disilicate Crowns Luted With Self-adhesive Resin Cement Recorded Statistically Significant Highest Marginal And Internal Gap Mean Values Followed By Zirconia Crowns Luted With Resin Modified Glass Ionomer Cement Then Lithium Disilicate Crowns Luted With Resin Modified Glass Ionomer Cement While Zirconia Crowns Luted With Self-adhesive Resin Cement Recorded The Lowest Statistically Significant Marginal And Internal Gap Mean Values.