title: The effect of variation in powder particle size on the doughing and manipulation times and some mechanical properties of acrylic resin.
abstract: In this study, the hypothesis examined is that differences in polymer particle size affect the doughing and manipulation times and the mechanical properties of the cured product. Six batches of polymers were used varying in particle size from <38 micrometers diameter to > 75 micrometers diameter. A penetration test was undertaken to investigate the influence of polymer particle size on the doughing and manipulation times of acrylic resin. It was demonstrated that the particle size in the range examined influenced the doughing and manipulation times, the smaller particle sizes having shorter times. No significant difference was demonstrated in the impact resistance of surface hardness of acrylic resin specimens constructed from polymers of varying particle size and although there were some significant differences in the transverse (flexural) strength these were small in real terms. Further, the molecular weight of the polymerised product was found to be consistently higher than that of the original powder component.
authors.affiliation: Department of Oral and Dental Science, University of Bristol Dental School, UK.
authors.forename: A
authors.initials: A
authors.lastname: Harrison
authors.forename: J B
authors.initials: JB
authors.lastname: Magara
authors.forename: R
authors.initials: R
authors.lastname: Huggett
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry*; D000704:Analysis of Variance; D003819:Denture Bases; D004548:Elasticity; D006244:Hardness; D008422:Materials Testing; D008768:Methylmethacrylates / Q000737:chemistry; D008970:Molecular Weight; D010316:Particle Size; D018583:Pliability; D013499:Surface Properties; D013674:Technology, Dental; D013997:Time Factors
chemical_list: D000180:Acrylic Resins; D008768:Methylmethacrylates