Jong-Won Lee1, Ji-Man Park2, Eun-Jin Park3, Seong-Joo Heo4, Jai-Young Koak4, Seong-Kyun Kim4. 1. Resident, Department of Prosthodontics, School of Medicine, Ewha Woman's University, Seoul, Republic of Korea. 2. Clinical Associate Professor, Department of Prosthodontics and Dental Research Institute, Seoul National University Gwanak Dental Hospital, Republic of Korea. Electronic address: jimarn@snu.ac.kr. 3. Professor, Department of Prosthodontics, School of Medicine, Ewha Woman's University, Seoul, Republic of Korea. 4. Professor, Department of Prosthodontics and Dental Research Institute, Seoul National University, Seoul, Republic of Korea.
Abstract
STATEMENT OF PROBLEM: A limited number of clinical studies have evaluated the accuracy of a digitally generated removable partial denture (RPD) intraorally. An analysis of the accuracy of the digital RPD on a larger number of participants was needed. PURPOSE: The purpose of this clinical study was to analyze the accuracy of digital RPDs by using the replica technique. MATERIAL AND METHODS: The fit accuracy of digital RPDs fabricated using electronic surveying was analyzed by fabricating replicas with silicone registration material and measuring with a stereomicroscope and image program. A total of 348 measurements in 10 participants were analyzed. The internal discrepancy of the metal framework was evaluated among participants using different Kennedy classifications. The accuracy of fittings in the cingulum and occlusal rest areas were compared according to the denture support type and the measured position below the rest. A 2-way and 1-way ANOVA and an independent 2-sample t test were used for statistical analysis (α=.05). RESULTS: Statistically significant differences were found in the internal discrepancy of the various framework components (P<.05), but no differences were found among participants with different Kennedy classifications (P>.05). The discrepancy under the periphery of the rest was determined to be smaller than that of the center, especially for the cingulum rest (P<.01). CONCLUSIONS: Digital RPDs fabricated using electronic surveying varied in accuracy of fit. According to the rest contact positions, the accuracy observed at the periphery was better than at the center.
STATEMENT OF PROBLEM: A limited number of clinical studies have evaluated the accuracy of a digitally generated removable partial denture (RPD) intraorally. An analysis of the accuracy of the digital RPD on a larger number of participants was needed. PURPOSE: The purpose of this clinical study was to analyze the accuracy of digital RPDs by using the replica technique. MATERIAL AND METHODS: The fit accuracy of digital RPDs fabricated using electronic surveying was analyzed by fabricating replicas with silicone registration material and measuring with a stereomicroscope and image program. A total of 348 measurements in 10 participants were analyzed. The internal discrepancy of the metal framework was evaluated among participants using different Kennedy classifications. The accuracy of fittings in the cingulum and occlusal rest areas were compared according to the denture support type and the measured position below the rest. A 2-way and 1-way ANOVA and an independent 2-sample t test were used for statistical analysis (α=.05). RESULTS: Statistically significant differences were found in the internal discrepancy of the various framework components (P<.05), but no differences were found among participants with different Kennedy classifications (P>.05). The discrepancy under the periphery of the rest was determined to be smaller than that of the center, especially for the cingulum rest (P<.01). CONCLUSIONS: Digital RPDs fabricated using electronic surveying varied in accuracy of fit. According to the rest contact positions, the accuracy observed at the periphery was better than at the center.
Authors: Naseer Ahmed; Maria Shakoor Abbasi; Sara Haider; Nimra Ahmed; Syed Rashid Habib; Sara Altamash; Muhammad Sohail Zafar; Mohammad Khursheed Alam Journal: Biomed Res Int Date: 2021-09-06 Impact factor: 3.411