Abstract
This study evaluated the effect of disinfection methods [chemical disinfection (immersion in 100 ppm chloride solution) or microwave disinfection (690 W for 6 min)] on the internal adaptation of denture bases and resin surface roughness. For the adaptation test, 18 maxillary denture bases were obtained from stone casts duplicated from a metallic master model and submitted to the following treatments: 1) control (no disinfection), 2) chemical disinfection or 3) microwave disinfection. Disinfection procedures were performed twice (T1, T2) with a 7-day interval between them. Internal adaptation was measured at baseline (T0) and after T1 and T2 by weighing a vinyl polysiloxane film reproducing the gap between the resin base and the master model. For surface roughness measurement, 60 rectangular (5x10x40 mm) resin specimens were either mechanically or chemically polished and then submitted to the disinfection treatments. Surface roughness (Ra) was recorded after polishing (T0) and after T1 and T2. Data were analyzed by ANOVA GLM for repeated measures and Bonferroni correction at 5% significance level. Bases submitted to microwave disinfection had gradual increase of misfit, while bases immersed in chloride solution did not differ from the control group. Surface roughness increased in the mechanical polishing groups with microwave disinfection and decreased in the chemical polishing groups.
Highlights
Adequate maintenance of removable prostheses is needed for denture wearers to have an esthetic, odorfree appliance and good oral health
Microwave irradiation has been considered for denture sterilization/disinfection instead of chemical solutions because it requires no special storage, has no expiration date and does not induce resistance to Candida albicans [3,4,5]
The results of the internal adaptation and surface roughness tests for each experimental group are given on Tables 1 and 2
Summary
Adequate maintenance of removable prostheses is needed for denture wearers to have an esthetic, odorfree appliance and good oral health. Oral problems related to poor hygiene of dentures support the need to establish a disinfection protocol that is effective, clinically viable, inexpensive and easy to comply with. Chemical disinfection of dentures is commonly achieved by soaking in alkaline glutaraldehyde, sodium hypochlorite, aqueous formaldehyde or enzymatic solutions [12]. Microwave irradiation has been considered for denture sterilization/disinfection instead of chemical solutions because it requires no special storage, has no expiration date and does not induce resistance to Candida albicans [3,4,5]. The available disinfection methods for complete and partial dentures are still controversial because they may alter some material properties and clinical features. Surface alteration may occur by continuous use of some disinfection methods, e.g., staining (by soaking in chlorhexidine) or bleaching (by soaking in sodium hypochlorite). Surface roughness of denture base resins might be modified depending on the initial surface quality and disinfection procedure
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