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Stress Distribution under Commercial Denture Liners- A Finite Element and Clinical Analysis

Identifieur interne : 000498 ( Main/Exploration ); précédent : 000497; suivant : 000499

Stress Distribution under Commercial Denture Liners- A Finite Element and Clinical Analysis

Auteurs : Rahul Shrivastava ; Saurabh Chaturvedi ; Ashok Kumar Verma ; Mariyum Ali ; Amrita Nagendra ; Mudita Chaturvedi

Source :

Journal of Clinical and Diagnostic Research : JCDR [ 2249-782X ] ; 2016.

RBID : PMC:5296569

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.

Url:

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5296569

DOI: 10.7860/JCDR/2016/21466.9027
PubMed: 28208996
PubMed Central: 5296569

Affiliations:

Le document en format XML

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<author><name sortKey="Shrivastava, Rahul" sort="Shrivastava, Rahul" uniqKey="Shrivastava R" first="Rahul" last="Shrivastava">Rahul Shrivastava</name>
<affiliation><nlm:aff id="aff1"> Clinical Practitioner,<institution>Dental Care Oral Implantology Center and Axiss Dental Pvt., Ltd.</institution>
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<front><div type="abstract" xml:lang="en"><sec><title>Introduction</title>
<p>Previous studies have shown that 20-30% of denture users have been dissatisfied with their dentures.</p>
</sec>
<sec><title>Aim</title>
<p>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.</p>
</sec>
<sec><title>Materials and Methods</title>
<p>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.</p>
</sec>
<sec><title>Results</title>
<p>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.</p>
</sec>
<sec><title>Conclusion</title>
<p>The viscoelastic liner provided the most uniform stress distribution and performed better than an elastic liner with hard, firm and soft foods.</p>
</sec>
</div>
</front>
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<tree><noCountry><name sortKey="Ali, Mariyum" sort="Ali, Mariyum" uniqKey="Ali M" first="Mariyum" last="Ali">Mariyum Ali</name>
<name sortKey="Chaturvedi, Mudita" sort="Chaturvedi, Mudita" uniqKey="Chaturvedi M" first="Mudita" last="Chaturvedi">Mudita Chaturvedi</name>
<name sortKey="Chaturvedi, Saurabh" sort="Chaturvedi, Saurabh" uniqKey="Chaturvedi S" first="Saurabh" last="Chaturvedi">Saurabh Chaturvedi</name>
<name sortKey="Nagendra, Amrita" sort="Nagendra, Amrita" uniqKey="Nagendra A" first="Amrita" last="Nagendra">Amrita Nagendra</name>
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Stress Distribution under Commercial Denture Liners- A Finite Element and Clinical Analysis

Stress Distribution under Commercial Denture Liners- A Finite Element and Clinical Analysis

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