title: A comparison of three methods for preparing reversible hydrocolloid duplicating material.
abstract: This study compared the effects of repeated microwave oven and double-boiler liquefactions and prolonged autoduplicator storage on four physical properties of one reversible hydrocolloid duplicating material. No significant differences were observed between the linear dimensional change and detail reproduction of the three liquefaction techniques. Tear strength differences most clearly distinguished the techniques and effects of aging. Fifteen double-boiler remeltings produced tear strength values lower than those recorded for material stored in an autoduplicator for 2 weeks. Thirty microwave melting cycles still produced tear strength values equivalent to that of the autoduplicator material. After 30 melting cycles the compressive strengths of the microwave and double-boiler materials were inferior to that of the stored autoduplicator material.
authors.affiliation: School of Dentistry, Indiana University, Indianapolis, USA.
authors.forename: M W
authors.initials: MW
authors.lastname: Wilhelm
authors.forename: C J
authors.initials: CJ
authors.lastname: Andres
authors.forename: D T
authors.initials: DT
authors.lastname: Brown
authors.forename: C A
authors.initials: CA
authors.lastname: Munoz
mesh_terms: D000464:Alginates / Q000737:chemistry*; D000704:Analysis of Variance; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003760:Dental Impression Materials / Q000737:chemistry*; D006358:Hot Temperature; D008422:Materials Testing; D008872:Microwaves; D015203:Reproducibility of Results; D018709:Statistics, Nonparametric; D013674:Technology, Dental / Q000295:instrumentation / Q000379:methods; D013718:Tensile Strength; D014783:Viscosity
chemical_list: D000464:Alginates; D003760:Dental Impression Materials