Manar Al-Fadhli *, Hesham Katamich ** And Cherif Mohsen***,

ABSTRACT
Objective: The Purpose Of This Study Is To Study The Fracture Resistance Of Anterior Endocrown Versus Post Crown Restoration.

Materials & Methods: Twenty Caries Free Of Extracted Human Maxillary Canine With Complete Root Formation Were Selected For This Study. Also Two Types Of Ceramics Were Used: IPS E.max Press And Celtra Press. Twenty Samples Were Fabricated And Divided Into 2 Groups (10 Samples Each) According To The Type Of Ceramic Used. Then Each Subgroup Was Subdivided Into 2 Subgroups (5 Samples Each) According To The Type Of Restorations: Endocrown 10 Mm, Post +core +crown. All Specimens Were Subjected To A Thermocycling Procedures In Automated Thermocycling Machine. Samples Were Thermocycled For 5000 Cycles, Between 5oC-55oC With A Dwell Time 15 Seconds. All Samples Were Individually Mounted On A Computer Controlled Materials Testing Machine For A Fracture Resistance Test. After Fracture Resistance Test, All Specimens In The Tested Groups Were Viewed Using A USB Digital-microscope, Magnificationx35, And The Images Were Captured And Transferred To A IBM Personal Computer Equipped With The Image-tool Software (Image J 1.43U, National Institute Of Health, USA) To Determine Failure Mode Pattern According To The Following Categorization. Results Regarding The Fracture Resistance Testing, The Results Of The Present Study Revealed That There Was No Statistically Significantdifference Between Mean Fracture Resistance Values Of IPS E.max Press(235.54N) And Celtra Press; (244.98N) Where Both Showed Statistically Non-significanthighest Mean Fracture Resistance. The Results Obtained In This Study Revealed A Non-significantdifference Between The Endocrowns Restorations And The Post & Core & Crown. Although Endocrowns Showed Higher Fracture Resistance Values Compared To The The Post & Core & Crown.