Abstract
Aims: To evaluate the effect of repair techniques, surface treatment with monomer, and additional curing cycle on the color change, and residual monomer of the repaired denture base. Materials and methods: Two hundred and seventy two samples of two brands heat cured acrylic resin were repaired by four different techniques (water bath, microwave, thermo press, and chemically cured acrylic resin), treated, and untreated with monomer, and repaired with 3 mm space at fracture area. The samples were tested to measure color change and residual monomer of repaired, and intact (control) samples. Results: Color change of acrylic denture base repaired by chemically cured acrylic resin was significantly higher than that of water bath, microwave, and thermo press. Microwave repairing technique had lower residual monomer than other techniques. The highest content of residual monomer was released in water after the first 24 hours and decreased in the subsequent days. Acrylic denture base that has additional curing cycle showed a residual monomer content lower than those with single curing cycle. Conclusion: Color changes of repaired denture with chemically cured resin are high and the lower adverse effect of monomer are shown with microwave and water bath curing cycle. Long storage period of repaired denture base are beneficial to reduce monomer release
Highlights
Denture fractures occur all too frequently resulting in great inconvenience to both the patient and dentist.[1]
The auto–polymerized resin had higher residual monomer levels compared with microwaveable resin.[4]. They concluded ‘the results suggesting that the residual monomer level does have an effect on the strength of repaired specimens’
Color Change test: Eighty acrylic specimens were prepared from two brands of heat cured acrylic resin (40 specimens from major2 acrylic denture base, and 40 specimens from QD acrylic resin)
Summary
Denture fractures occur all too frequently resulting in great inconvenience to both the patient and dentist.[1] The construction of a new denture is a time consuming and expensive. An effective repair material should be cost–fective, simple to use, have a short duration of curing, and no significant differences in optical density (color properties)(2), possess high strength, and durability, good aesthetics, be non–allergenic, and does not cause distortion to the existing denture.[3] The microwave polymerized resin had lower residual monomer levels than conventionally cured resin, yet had similar physical properties. The auto–polymerized resin had higher residual monomer levels compared with microwaveable resin.[4] They concluded ‘the results suggesting that the residual monomer level does have an effect on the strength of repaired specimens’. The lower the residual monomer levels, the stronger the repair. Lower residual monomer levels reduce the incidence of mucosal irritation and allergic reactions.[3]
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