Assessment of tensile bond strength and warpage of two new thermo-elastic acrylic resin materials. [BITEM and experimental acrylic resin]
EDJ-Egyptian Dental Journal. 2004; 50 (4 Part II): 2129-2136
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| ID: emr-204106
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EMRO
New materials and methods for processing denture bases are introduced from time to time for use in making a complete denture. The aim of this research is to study the bond strength and warpage of two new acrylic resin materials [BITEM and experimental acrylic resin] in comparison with conventional acrylic resin and soft liner
Materials and Methods: Two new acrylic resin materials were selected for this study. BITEM is the trade name for a new acrylic resin and it is the acronym for Biocompatable Intra-oral Thermo Elastic Material and experimental acrylic is a new modification type of acrylic resin which consists of the powder of heat cured acrylic resin and liquid is two bottles [A] monomer of heat cured acrylic resin and [B] plasticizer. For tensile bond strength testing, thirty specimens for each type of material were tested using a screw-driven mechanical testing system after three interval conditions 1-after processing with 48 hours. 2- After repeated soaking for [3 times] the specimens in warm water 60°C for 10 seconds. 3- After repeated soaking for [6 times] the specimens in warm water 60°C for 10 seconds]. For warpage test. 30 identical sectional casts of pure stone representing the dimensions of the edentulous ridge at posterior palatal area were constructed for each type of acrylic materials. The vertical distance between the finished plates and the original standard casts were measured after three interval conditions as in bond strength test
Results: For tensile bond strength test. Anova test revealed that significant differences between different materials [Experimental. BITEM and soft liner] after three interval conditions [after 48 hours. 3 times soaking in hot water and 6 times soaking in hot water]. L.s.d test showed that there was significant differences at [p<0.05] between immediate deflasking and repeated 6 times soaking in hot water for experimental and BITEM materials but there was no significant differences between immediate deflasking and repeated 3 times soaking while soft liner material showed, significant differences between immediate deflasking and 3 times soaking in hot water. For warpage test, a significant differences at [P<.001] between different materials [Experimental, BITEM and acrylic resin] after three interval conditions. L.s.d test showed that there was significant differences in warpage p<0.05] between immediate deflasking and 6 times repeated soaking in hot water for experimental and BITEM materials but there was no significant differences between immediate deflasking and 3 times repeated soaking. On the other hand conventional acrylic resin showed, no significant differences between immediate deflasking and repeated soaking in hot water
Materials and Methods: Two new acrylic resin materials were selected for this study. BITEM is the trade name for a new acrylic resin and it is the acronym for Biocompatable Intra-oral Thermo Elastic Material and experimental acrylic is a new modification type of acrylic resin which consists of the powder of heat cured acrylic resin and liquid is two bottles [A] monomer of heat cured acrylic resin and [B] plasticizer. For tensile bond strength testing, thirty specimens for each type of material were tested using a screw-driven mechanical testing system after three interval conditions 1-after processing with 48 hours. 2- After repeated soaking for [3 times] the specimens in warm water 60°C for 10 seconds. 3- After repeated soaking for [6 times] the specimens in warm water 60°C for 10 seconds]. For warpage test. 30 identical sectional casts of pure stone representing the dimensions of the edentulous ridge at posterior palatal area were constructed for each type of acrylic materials. The vertical distance between the finished plates and the original standard casts were measured after three interval conditions as in bond strength test
Results: For tensile bond strength test. Anova test revealed that significant differences between different materials [Experimental. BITEM and soft liner] after three interval conditions [after 48 hours. 3 times soaking in hot water and 6 times soaking in hot water]. L.s.d test showed that there was significant differences at [p<0.05] between immediate deflasking and repeated 6 times soaking in hot water for experimental and BITEM materials but there was no significant differences between immediate deflasking and repeated 3 times soaking while soft liner material showed, significant differences between immediate deflasking and 3 times soaking in hot water. For warpage test, a significant differences at [P<.001] between different materials [Experimental, BITEM and acrylic resin] after three interval conditions. L.s.d test showed that there was significant differences in warpage p<0.05] between immediate deflasking and 6 times repeated soaking in hot water for experimental and BITEM materials but there was no significant differences between immediate deflasking and 3 times repeated soaking. On the other hand conventional acrylic resin showed, no significant differences between immediate deflasking and repeated soaking in hot water
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Indice:
IMEMR
langue:
En
Texte intégral:
Egypt. Dent. J.
Année:
2004