Abstract

THOKOANE, MG  and  OWEN, CP. The dimensional distortion of acrylic resin denture bases subjected to dual cure methods. S. Afr. dent. j. [online]. 2019, vol.74, n.7, pp.370-372. ISSN 0375-1562.  http://dx.doi.org/10.17159/2519-0105/2019/v74no7a3.

INTRODUCTION: Appropriatech is a philosophy under which methods have been proposed to reduce the number of visits necessary for procedures such as complete denture therapy, thereby reducing costs. One such method uses acrylic bases after the first visit which will require a subsequent dual cure which may produce distortion of the base. AIM: To measure the three-dimensional distortion of different dual curing methods using the same resin. METHODS: A standardised maxillary denture base with teeth was created. Markers were set at different heights, to enable three-dimensional recordings, taken to an accuracy of 4 using a reflex microscope. First, the teeth were set in wax on the clear acrylic heat-cured base, and the positions of the markers recorded. These bases were then subjected to a second processing, and measurements again taken. Four dual curing methods of varying temperatures and times were used. RESULTS AND CONCLUSIONS: All methods produced similar three-dimensional distortions of the denture base but the distortion was small, not affecting the fit or retention of the base. The most rapid method can therefore be used for a second cure onto an existing denture base.

Keywords : Denture base; distortion; dual-cure; rapid-cure resins.

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