Abstract
Aims: To investigate the effect of the thickness of relining material, curing method (water bath or mi-crowave), and the surface treatment by methyl methacrylate on transverse and tensile strength of re-lined acrylic resin denture base. Materials and methods: A pilot study was done by preparing 65 sam-ples to evaluate the effect of the thickness of relining material in relation to denture base on the trans-verse strength of acrylic resin denture base, and to study the effect of surface treatment by methyl methacrylate on the transverse strength of acrylic resin denture base. The main study was done by pre-paring 320 samples and divided into two parts to study the mechanical properties of samples represent-ing a denture base cured by water bath and other group cured by microwave curing technique, and then the effect of relining by the two curing methods and the effect of surface treatment were evaluated. Analysis of variance (ANOVA) and Duncan's multiple range tests were used for statistical analysis. Results: of this study showed that the different thickness of relining material in relation to denture base had no significant difference on the transverse strength of the relined denture base. The transverse strength and tensile bonding strength of the relined samples were significantly improved (P=0.05) by monomer surface treatment for 180 seconds. Conclusions: Transverse and tensile strength of the acryl-ic resin denture base were affected by relining. Microwave curing method gave better mechanical properties of the relined acrylic resin denture base.
Highlights
In 1937, polymethyl methacrylate (PMMA) was introduced, and used widely as a denture base material
PMMA provided enhanced physical, and esthetic properties; in addition it was readily available, inexpensive, and manipulated.(1- 3) Polymethyl methacrylate had an accepta(flexural strength), and impact strength of a material is a measure of stiffness,(4) and resistance to fracture
Flexural strength tests were undertaken as these were considered relevant to the loading characteristics of a denture base in a clinical situation.(5,6) Among the favorable properties of poly methyl methacrylate denture base resin is its ability to bond to new resin even after complete polymerizawww.rafidaindentj.net
Summary
In 1937, polymethyl methacrylate (PMMA) was introduced, and used widely as a denture base material. PMMA provided enhanced physical, and esthetic properties; in addition it was readily available, inexpensive, and manipulated.(1- 3) Polymethyl methacrylate had an accepta(flexural strength), and impact strength of a material is a measure of stiffness,(4) and resistance to fracture. Flexural strength tests were undertaken as these were considered relevant to the loading characteristics of a denture base in a clinical situation.(5,6) Among the favorable properties of poly methyl methacrylate denture base resin is its ability to bond to new resin even after complete polymerizawww.rafidaindentj.net. One common problem with relining is failure in adhesion between the reline material and the denture base material.(2)
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