Effect of repeated microwave disinfection on surface roughness and baseplate adaptation of denture resins polymerized by different techniques
Keywords:
Dental polymers, denture resins, microwave disinfection, surface roughness, dimensional stabilityAbstract
Purpose: To evaluate the cumulative effect of two protocols of microwave disinfection (Protocol 1: 690 W/6 min; Protocol 2: 345 W/6 min) on surface roughness (Ra) and baseplate adaptation of two denture resins polymerized by microwave energy (Onda Cryl) or hot water bath (QC-20). Methods: For Ra evaluation, rectangular specimens were fabricated and subjected to the following disinfection treatment (n=8/group): 1) Control (no disinfection), 2) Protocol 1, and 3) Protocol 2. Ra was measured using a profilometer at baseline (T0) and after two disinfection procedures (T1, T2) with a 7-day interval immersed in distilled water. To evaluate dimensional stability, maxillary baseplates were divided into the disinfection treatment groups (n=6), and adaptation was measured by weighing a silicon film reproducing the gap between resin baseplate and a metallic master model. Results: Ra had a significant interaction between type of resin/polymerization technique, disinfection treatment, and number of disinfection procedures (P<0.001). For Ra, Protocol 2 and control groups had similar increase of Ra over time, but Protocol 1 groups showed a significant decrease of Ra in T2. Baseplate adaptation was affected by a significant interaction between disinfection treatment and number of disinfection procedures (P<0.001), and Protocol 1 yielded the largest mean in T2. Conclusion: Onda Cryl displayed greater changes of Ra and adaptation than QC-20. Protocol 1 promoted overall damage to both types of denture resins after two disinfection procedures. Key words: Dental polymers; denture resins; microwave disinfection; surface roughness; dimensional stabilityDownloads
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