Rahul Shrivastava1, Saurabh Chaturvedi2, Ashok Kumar Verma3, Mariyum Ali4, Amrita Nagendra1, Mudita Chaturvedi5. 1. Clinical Practitioner, Dental Care Oral Implantology Center and Axiss Dental Pvt., Ltd. , DLF Phase 1, Gurugram, Haryana, India . 2. Assistant Professor, Department of Prosthodontics, College of Dentistry, King Khalid University , Abha, Saudi Arabia . 3. Professor and Head, Department of Prosthodontics, Career Post Graduate Institute of Dental Sciences , Lucknow, Uttar Pradesh, India . 4. Professor, Department of Prosthodontics, Career Post Graduate Institute of Dental Sciences , Lucknow, Uttar Pradesh, India . 5. Assistant Professor, Department of Oral Pathology, Career Post Graduate Institute of Dental Sciences , Lucknow, Uttar Pradesh, India .
Abstract
INTRODUCTION: Previous studies have shown that 20-30% of denture users have been dissatisfied with their dentures. AIM: To evaluate the stress pattern under elastic and viscoelastic denture liners using 3-Dimensional Finite Element Analysis (FEA) and its clinical correlation using a questionnaire. MATERIALS AND METHODS: The study had both in-vitro and in-vivo phases. In in-vitro phase fabrication of a virtual parametric model of edentulous maxilla and dentures with overlying mucosa was made. A virtual load of 166N was analyzed at three points (Point A=anterior ridge, Point B=right posterior ridge and Point C=left posterior ridge). For the in-vivo phase, 20 edentulous patients were provided conventional complete dentures (Group-I). The dentures were lined with silicone (elastic) liners (Group-II) and acrylic resins (viscoelastic) liners (Group-III) at regular (2 months) intervals. After each reline, the patients were evaluated using food eating ability and denture assessment questionnaires. The results were statistically analyzed. The statistical analysis was done using SPSS (Statistical Package for Social Sciences) version 15.0 statistical analysis software. Other than standard statistical test Analysis of Variance (ANOVA) and Post-Hoc tests (Tukey-HSD) were used. RESULTS: At loading, the in-vitro result for Groups-II and III revealed pressures of 0.074231N and 0.0678364N at Point A, 0.098764N and 0.093642N at Point B, and 0.099876N and 0.093746N at Point C respectively. The in-vivo study revealed that the mean quality of life score for different groups ranged from 23.65±4.00 (Group I) to 33.10±6.15 (Group III). The mean quality of life score for Group II was 29.50±5.08. CONCLUSION: The viscoelastic liner provided the most uniform stress distribution and performed better than an elastic liner with hard, firm and soft foods.
INTRODUCTION: Previous studies have shown that 20-30% of denture users have been dissatisfied with their dentures. AIM: To evaluate the stress pattern under elastic and viscoelastic denture liners using 3-Dimensional Finite Element Analysis (FEA) and its clinical correlation using a questionnaire. MATERIALS AND METHODS: The study had both in-vitro and in-vivo phases. In in-vitro phase fabrication of a virtual parametric model of edentulous maxilla and dentures with overlying mucosa was made. A virtual load of 166N was analyzed at three points (Point A=anterior ridge, Point B=right posterior ridge and Point C=left posterior ridge). For the in-vivo phase, 20 edentulouspatients were provided conventional complete dentures (Group-I). The dentures were lined with silicone (elastic) liners (Group-II) and acrylic resins (viscoelastic) liners (Group-III) at regular (2 months) intervals. After each reline, the patients were evaluated using food eating ability and denture assessment questionnaires. The results were statistically analyzed. The statistical analysis was done using SPSS (Statistical Package for Social Sciences) version 15.0 statistical analysis software. Other than standard statistical test Analysis of Variance (ANOVA) and Post-Hoc tests (Tukey-HSD) were used. RESULTS: At loading, the in-vitro result for Groups-II and III revealed pressures of 0.074231N and 0.0678364N at Point A, 0.098764N and 0.093642N at Point B, and 0.099876N and 0.093746N at Point C respectively. The in-vivo study revealed that the mean quality of life score for different groups ranged from 23.65±4.00 (Group I) to 33.10±6.15 (Group III). The mean quality of life score for Group II was 29.50±5.08. CONCLUSION: The viscoelastic liner provided the most uniform stress distribution and performed better than an elastic liner with hard, firm and soft foods.
Authors: Ali Kemal Ozdemir; Hatice Deniz Ozdemir; Nilüfer Tülin Polat; Mehmet Turgut; Hafize Sezer Journal: Int J Prosthodont Date: 2006 Jul-Aug Impact factor: 1.681