Strength and Surface Roughness of Cross Linking Acrylic Resin Processed by Different Heat Curing Methods

Abstract

Background: Heat-cured acrylic resin is considered one of the most commonly used denture base material in denture construction, but this material is not ideal in every respect. So many researches have been carried out to find an alternative material like cross linking acrylic resin. Meanwhile, the curing procedures have been modified to improve the physical and mechanical properties of resin materials .The aim of this study was to evaluate the effect of three curing methods:(water bath, autoclave short cycle and autoclave long cycle) on transverse strength, tensile strength and surface roughness of cross linking acrylic denture base materials. Material and method: Cross linking acrylic resin was used in this study and processed in three curing methods (water bath, autoclave short cycle and autoclave long cycle). Ninety specimens were prepared. Each main group was subdivided into three subgroups according to the type of test used (transvers strength test, tensile strength test and surface roughness test). Each group contained 10 specimens for each test. Result:Three tests were used to analyze the results: analysis of variance (ANOVA), the least significant difference (LSD) and an independent T-test. There were no significant differences between the results of the processing techniques regarding transverse and tensile strength but there was a significant difference between the results of surface roughness tests. Conclusion: It was concluded that autoclave curing method can be used with different duration whether it is short or long instead of water bath curing method.

Effect of polymerization technique and glass fiber addition on the surface roughness and hardness of PMMA denture base material

“…The improvement in Ra values could be attributed to the levels of heat and pressure during autoclave polymerization, where the increase in the degree of conversion reduced the residual monomer and also improved surface roughness 31) . Autoclave polymerization significantly showed a lower Ra value in comparison to the control group, which was in agreement with previous research 32) . However, this study's findings were in disagreement with Nazhat et al 33) who found that there were no significant differences between the autoclave polymerization and the water bath methods.…”

Influence of Processing Techniques on Microhardness and Impact Strength of Conventional and Reinforced Heat Cured Acrylic Resin: A Comparative Study

“…For enhancement in its mechanical properties, researchers have amalgamated additives such as glass fibers, carbon fibers, rubber graft copolymer and polyethylene in its composition [3]. Along with additives, different types of equipment have also been used for processing of PMMA in an attempt to improve its strength, but none of them have been shown to be superior to the other [9][10][11]. To enhance the properties of strength.…”

“…Techniques for denture processing include water bath (WB), air circulating oven (ACO) and dry heat oven (DHO). WB is commonly used for denture base processing due to its ease of handling and cost effectiveness [11,19,20]. While DHO is also used for curing heat cure acrylic resin that showed improved dimensional stability, but less common due to its equipment cost and efficiency [21].…”

Vertical Occlusal Dimension Changes of Complete Dentures between Autoclave and Traditional Processing Techniques

“…The traditional water bath method (short polymerization cycle) was used for the control group due to the common use of this method among labs and its simplicity. This method was used by many previous researchers and considered as a control method in the polymerization of the acrylic dentures [15][16][17][18][20][21][22][23][24][25][26]. The polymerization using the autoclave technique was used previously by several researchers [15][16][17]22].…”