An-invitro comparison of Thermocycling Effect on Micro- hardness and Micro-tensil bond strength of Nano composite denture teeth | ||||
| Egyptian Dental Journal | ||||
| Article 9, Volume 65, Issue 2 - April (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), April 2019, Page 1495-1501 PDF (1.61 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/edj.2019.72574 | ||||
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| Author | ||||
| Hala Mohamed Abd El Hameed | ||||
| Assistant Professor of Prosthodontics, Faculty of Dentistry Suez Canal University | ||||
| Abstract | ||||
| Purpose: The purpose of this study was an evaluation of the effect of thermocycling on micro-hardness and microtensile bond strength (μTBS) of the cross-linked acrylic and nanocomposite teeth to the acrylic denture base. Materials and methods: twelve teeth of the upper denture teeth were selected. Six teeth of nano-hybrid composite resin denture teeth and six cross-linkedacrylic teeth. These teeth, together with theacrylic resin bases, have been fixed to a micro- sawing machine to form 120 microbeam samples. These samples were divided into two storage regimes (dry and thermocycler), forming eight groups, each group containing 15 beams. These 8 groups were divided in equal parts to test the micro-hardness and strength of the micro-tensile bond (4 groups for each test). Results: Paired t-test was used to analyze the effect of aging on micro- hardness and micro-tensile bond strength for both types of denture teeth. The tests were considered significant when p ≤ 0.05 and highly significant when p ≤ 0.001. Thermocycling procedure decrease the mean values in micro-tensile bond strength for both types of denture teeth brands but with statistical significant difference regarding the cross- linked acrylic one . it produces highly significant decrease in mean values for cross- linked acrylic but has nearly no effect on nanocomposit teeth regarding the micro-hardness test. Considering denture teeth brand Cross linked acrylic denture teeth showing higher mean values in micro- tensile bond strength before and after aging. Also, it was showing higher mean values in micro-hardness before thermocycling. This condition was totally reversed after aging as nano composite teeth showing higher mean values with significant difference in relation to acrylic one. Conclusion: The newly introduced nanohybrid composite denture teethwere less markedly affected by thermocycling specially in term of hardness,but practically and from financial point of view, the cross- linked acrylic resin teeth has a comparable result to nanocompsite one as it shows higher micro-tensile bond strength (μTBS) so, it appears more applicable for patients. | ||||
| Keywords | ||||
| Dentureteeth, denturebasematerials, microtensile bondstrength, microhardness; thermo-cycling | ||||
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