Effect of surface treatment on shear bond strength of artificial teeth to the denture base

Abstract

 Fracture or debonding of plastic teeth from the denture base are common clinical
problems, the optimal combination of acrylic resin denture teeth and microware cured
denture base resin is not well known .one hundred and twenty teeth (florident, acrylic
teeth cross-linked, china) were prepared and cured by heat cured (AkrilEks, heatcuring
resin for denture powder liquid, GuLSA LTD. Izmir-Turkey), and microware
cured (Acron mc, microwave-curing denture base resin powder liquid, GCLAB
Technologies inc. Alsip,IL60803 Japan) acrylic resin were used, then the teeth were
divided into six groups and treated with different surface treatment, the first group
received no further treatment(control); the second group treatment with diatoric
preparation; the third group treated with thinner(Turpentine-DYNA CoAT, Thinner,
Netherlands); the fourth group treated with tone(Propanone, Acetone, England 99%
Purity-Analyer); the fifth group were diatoric conditioned with acetone; the sixth
group were diatoric conditioned with thinner;(2nd group, 5th group and 6th group had
been a cutting mesiodistal retention grooves 2mm deep and 3mm wide acute into
ridge lap in acrylic resin teeth. One hundred and twenty specimens were divided into
two groups, first one was processed by conventional method and the other one
processed by microwave method and then tested by instron universal testing machine
(instron corporation 1195,canton mass).The results showed than microwave-cured
resin has a significant lower shear bond strength(SBS) mean values than water bathcured
resin to all denture teeth types. All surface treatment application improved
the(SBS) significantly level at(p value < 0.05), while the sixth group (diatoric
conditioned with thinner) showed the highest(SBS) than other group. The types of
acrylic denture resin, surface treatment and curing technique influenced the shear
bond strength of the tooth to the base the results of this study influenced the shear
bond strength of the tooth to the base. The results of this study indicate that diatoric
condition with thinner may be recommended to be applied on the denture ridge lap
prior to denture base processing.