EDJ

RETENTION OF TWO TYPES OF MACHINE MILLED NON METALLIC CROWNS LUTED WITH TWO ADHESIVE RESIN TECHNIQUES

ABSTRACT

Objectives: The Purpose Of This Study Was To Evaluate The Retention Of Two Non Metallic Machine Milled Crown Materials Using Two Different Adhesive Protocols. Methods: Twenty Intact Human Molars Were Used; Teeth Were Divided Into Two Main Groups According To The Crown Material Used, Each Group Has (10) Samples. Each Group Was Further Subdivided Into Two Subgroups According To The Type Of Resin Cement, Each Of (5) Samples. Standardized Tooth Preparation Was Carried Out By Milling Machine. Copings Were Fabricated Using Two Types Of Crown Materials: Lava Ultimate CAD CAM Blocks And IPS E.max CAD Blocks. Milled Copings Were Cemented To The Prepared Teeth Using Rely X U200 Self Adhesive Resin Cement And Rely X Ultimate Total Etch Resin Cement. All Samples Were Then Tested For Tensile Bond Strength.

Results: The Effect Of The Variables Combination (type Of Crown Material And Cement Type) On The Tensile Bond Strength Revealed That (Lava Ultimate With Rely X U200 Self-adhesive Resin Cement) Group Produced The Highest Tensile Bond Strength Compared With Combination Groups.

Conclusions: The Retentive Strength Of Lava Ultimate Ceramic Copings When Cemented With Self-adhesive Resin Cement Was The Highest.

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