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Filter by:Purpose: To compare the overall accuracy and fit of different components for mandibular metallic removable partial denture (RPD) frameworks fabricated by selective laser melting using combined analog-digital, and fully digital impression techniques. Material and methods. Two RPD frameworks were fabricated for each of the 18 participants using each of the 2 techniques of the 18 participants enrolled, were of mandibular Kennedy class I, the first technique was the combined analog-digital workflow had the analog steps include: a physical impression was made using polyvinyl siloxane, stone casts were made, then the stone cast was scanned with a laboratory scanner to generate a digital cast. The 3Shape CAD software was then used to design a digital RPD, which was fabricated from a cobalt-chroumum alloy by selective laser melting. The second technique was fully digital where an intraoral digital scanner was used to make a definitive scan, which was sent to the 3Shape software for digitally designing the RPD framework and subsequent selective laser melting for fabrication. For both frameworks in the same participant, the same design was used for consistency. To assess the accuracy of fit, based on STL data analysis (intra-oral digital superimposition evaluation), a color map was constructed using non metrology software, and overall fit accuracy and the misfit (distance between each framework component and the reference intra-oral scan) were measured at rest, guiding plane and lingual plate areas.
Objectives: The objective of this study was to assess prospectively the effectiveness of ultrasonic denture hygiene interventions in improving denture cleanliness among community-dwelling elders. Methods: A randomized clinical trial was conducted among community-dwelling elders, in which a total of 66 subjects who received upper metal framework removable partial dentures in the past five years were recruited randomly from a computerized database. They were randomly allocated into three denture hygiene intervention groups: group 1 (mechanical cleaning with a toothbrush and ultrasonic cleaning with cetylpyridinium chloride mouthrinse), group 2 (mechanical cleaning with a toothbrush and ultrasonic cleaning with distilled water) and control (mechanical cleaning with a toothbrush only). Denture cleanliness was assessed at baseline and one month review using: i) Denture Cleanliness Index (DCI) scores; ii) plaque coverage percentage; and (iii) microbiological tests. Results: There were significantly greater reductions in mean DCI scores and mean percentage of plaque coverage area in group 1 and group 2 compared to the control group for both CoCr and acrylic fitting surfaces (p<0.001). Group 1 had significant reductions in the viable counts of bacteria (CoCr and acrylic) and yeast (CoCr only) (p<0.05), while only significant reductions in bacterial viable counts (CoCr and acrylic) (p<0.05) were documented in Group 2. No significant differences were detected between groups 1 and 2 with regards to all clinical and microbiological outcomes. When comparing these parameters for CoCr and acrylic surfaces, no significant differences were observed following the intervention period. Conclusions: The ultrasonic cleaner was significantly more effective than the control in the reduction of biofilm coverage on metal framework removable partial dentures during the one month intervention period. The adjunctive use of cetylpyridinium chloride with ultrasonic cleaning did not yield improved outcomes compared to water.