Patient satisfaction with conventional dentures vs. digital dentures fabricated using 3D-printing: A randomized crossover trial.

PURPOSE: Evidence regarding the performance of digital dentures (DDs) fabricated using 3D printing is insufficient. This study aimed to evaluate patient satisfaction with conventional dentures (CDs) and DDs fabricated using 3D printing. METHODS: This randomized controlled trial was conducted between November 2017 and May 2020. In the CD-DD group, CDs were fabricated before DDs, while the protocol was reversed in the DD-CD group. The primary outcome was patient satisfaction, quantified using a 100-mm visual analog scale, which assessed chewing efficiency, pain, stability, retention, comfort, esthetics, ease of cleaning, phonetics, and general satisfaction. Secondary outcomes were quality of life (QOL), number of visits, time required for definitive denture fabrication, number of adjustment appointments, and time required for denture stabilization after denture delivery. RESULTS: Patient satisfaction with CDs was superior in terms of phonetics, ease of cleaning, stability, comfort, and general satisfaction. Secondary outcomes such as social disability and the number of clinic visits were significantly lower in patients with DDs. However, the two groups showed no significant differences in the other outcomes. Although patient satisfaction with DDs was inferior to that with CDs, 20% of patients preferred and used DDs (12 patients preferred CDs, and three patients opted for DDs). CONCLUSION: Although patient satisfaction or QOL with DDs may be somewhat inferior to that with CDs, 20% of patients preferred and used DDs daily. Thus, DDs fabricated using 3D printing may have comparable practicality and efficacy to CDs.

Effectiveness of a clinical pathway for complete denture adjustment.

This study was performed to evaluate the usefulness of a developed clinical pathway (CP) to determine the sequence of dental treatment in patients who are edentulous and use maxillary and mandibular complete dentures. Sixty-two edentulous patients with maxillary and mandibular complete dentures were randomly allocated either to with (31 subjects) or without (31 subjects) a CP. The main categories of the CP were the examination, instructions, practice, idle time, evaluation sheet, preparation, and other steps. The subcategories were made with respect to the main categories. The participants were categorized as dentists, assistants, or patients. There was no significant difference in mean chair time between with a CP (27.5 min) and without a CP (28.0 min). The CP led to a significant reduction in idle time (waiting in the chair or no treatment) of dentists, assistants, and patients. In contrast, the instances of medical examination, patients' instructions, and the number of patients reporting improvement of symptoms significantly increased. These results indicated that there is an opportunity to improve the complete denture treatment with a CP.

Pathogenic characterization of Erysipelothrix rhusiopathiae Met-203 type SpaA strains from chronic and subacute swine erysipelas in Japan.

To characterize the Erysipelothrix rhusiopathiae Met-203 type surface protective antigen (Spa) A strains causing swine erysipelas in Japan, the nucleotide sequence of the hypervariable region of the spaA gene was determined in 80 E. rhusiopathiae (serotype 1a) isolates collected from pigs with chronic and subacute swine erysipelas in 14 prefectures in 2008-2014. In this study, 14 (17.5%) isolates were Met-203 type SpaA strains. We confirmed the pathogenicity of a Met-203 type SpaA strain in specific-pathogen-free pigs. In this experiment, the two challenged pigs displayed arthritis, urticaria and other clinical signs, but recovered within 10 days. Our results reveal the existence of the E. rhusiopathiae Met-203 type strains that have been causing chronic erysipelas in Japan.