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At least 811 records · Page 45Linked to original sources
PubMed1995

Transverse bond strength of repaired acrylic resin strips and temperature rise of dentures relined with VLC reline resin.

This study measured the transverse strength of polymethyl methacrylate heat-cured resin samples repaired with Triad visible light-cured reline resin with and without bonding pretreatments and with autopolymerizing resin, and it measured the temperature rise of Triad resin during relining of complete dentures at various curing cycles. The results indicated that pretreatment with either monomer or Triad bonding agent improved the bond of the Triad visible light-cured reline resin to the heat-cured resin. However, the use of the monomer rather than bonding agent resulted in a stronger bond and obtained values similar to those of samples repaired with autopolymerizing resin. Polymerization of samples repaired with Triad resin in the curing unit for two cycles of 5 minutes with 1 minute between cycles resulted in bubble formation and severe distortion of the heat-cured resin in the samples. Curing of the relined dentures for 10 minutes as recommended by the manufacturer raised the average peak temperature to 120 degrees C. In addition, it was shown that interrupting the light curing cycle attenuated the temperature rise, but it also resulted in a relatively softer reline resin. A continuous light curing of at least 5 minutes with the adjunct temperature rise is required to reach 1-hour hardness of 21.8 Vickers hardness number of the Triad reline resin.

Acrylic Resins↗
PubMed1979

The bending strength of acrylic resin samples repaired under pressure.

The bending strength of heat-cured resin samples was found to be 49% higher than that of autopolymerizing resin samples cured under room conditions. Curing the latter resin in a pressure vessel at 32psi and 30 degrees C increased its strength by 4.5%. For this reason and because a less porous material is obtained, pressure-curing may be employed with advantage for the preparation of various appliances from S.C. resin. The effect of pressure-curing in increasing the strength of the repaired samples was not significant. It would also appear that pressure affects the porosity of small quantities of repair material less than when appliances are made from S.C. resins only. The increase in strength achieved by pressure-curing repairs, in which only small quantities of S.C. resin are used, is therefore questionable.

Acrylic Resins↗