Noran Mohammad Mostafa Elsharkawi, Hisham Katamish And Tarek Salah Morsi,
ABSTRACT
Purpose: To Evaluate The Micro-tensile Bond Strength Of The New Activa Bioactive Cement With E-max And Cerasmart In Comparison To The Conventional Resin Cement Before And After Thermocycling.
Methodology: Two Plates Were Cut From Each Ceramic Block Material (3 Mm Thickness) Using Isomet Saw: (LDS E.max), And (hybrid Cerasmart). Surface Treatment Of The Ceramic Specimens Was Done According To The Manufacturer?s Instructions. Application Of Resin And Bioactive Cements To Each Ceramic Block Was Done And Then Cured. Bonded Specimens Were Sectioned Into Micro-bars To Obtain 80 Samples, 40 Samples For Each Ceramic Block (group I & Group II). Each Group Was Subdivided Into Two Subgroups According To Cement Type (subgroup1 & Subgroup 2). Each Subgroup Was Further Subdivided Into Two Divisions 10 Samples Each For The Thermocycling (division A & Division B). Thermocycling Was Done In Water For 5000 Cycles Between 5 And 55 �C. All Samples Were Subjected To Micro-Tensile Bond Strength (�TBS) Test Using Universal Testing Machine. Data Were Analyzed Using Three-way ANOVA To Study The Effect Of Ceramic, Cement, Thermocycling And Their Interaction On Mean Micro �TBS (P � 0.05).
Results: Regarding The Effect Of Ceramic Type, Either With Activa Or Resin Cements, Before Or After Thermocycling; Cerasmart Had Statistically Significantly Higher Values Of Mean ?TBS Than E.max. Regarding The Effect Of Cement Type; After Thermocycling, Either With Cerasmart Or E.max; There Was No Statistically Significant Difference Between The ?TBS Values Of The Two Cements. Regarding The Effect Of Thermocycling, Results Showed That Thermocycling Significantly Decreased The Mean ?TBS Of Both Ceramic Materials When Using Either Activa Or RelyX Ultimate Resin Cements.
Conclusions: Within The Limitations Of This Study, It Was Concluded That For Both Tested Cements, Thermocycling Affected Negatively The Micro-tensile Bond Strength (?TBS).
