Saurabh Chaturvedi

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

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.

A comparative study to evaluate the vertical position of maxillary central incisor and canine in relation to incisive papilla line

Objectives: The aim of the study was to determine the vertical distance of maxillary central incisor (CI) and maxillary canine (CA) from the incisive papilla (IP) line and their variation with age and sex. Materials and Methods: A total of 120 dentulous subjects following the inclusion and exclusion criteria were randomly selected from the local population. On the basis of gender and age, subjects were divided into four groups: Ma, Mb, Fa and Fb . Maxillary impressions of selected subjects were made and corresponding casts were retrieved. The cast was positioned on the surveyor and the center of IP was transferred to the labial side of maxillary right CI and CA regions with the help of analyzing rod of the surveyor and a line was drawn in this region which was referred to as “IP line”. The measurements were made from the IP line to the mesio-incisal line angle of right maxillary CI-IP and cusp tip of right maxillary CA with the help of digital vernier caliper (CA to IP). Result: The mean vertical distance of maxillary CI-IP ranged from 6.31 ± 0.74 mm to 7.04 ± 0.87 mm and the mean vertical distance of maxillary CA-IP ranged from 5.83 ± 0.80 mm to 6.30 ± 0.82 mm. Conclusion: The CA position in relation to the IP line is more stable to its position than the CI position irrespective of age and sex.

Immediate Implant with simultaneous Ridge Augmentation

The Ultimate goal of prosthetic replacement following teeth loss, is to provide a functional restoration that is harmonious with the remaining natural dentition. To achieve this goal hard and soft tissues should be properly healed with good quality and adequate volume.

Rehabilitation of Nose following Chemical Burn Using CAD/CAM Made Substructure for Implant Retained Nasal Prosthesis: A Clinical Report

Insufficient knowledge of medical chemicals and their improper use have destructive effects. Accidental exposure to chemicals on facial tissue may result in large facial defect. For ages the tradition of piercing nose is common but improper use of unknown chemical for piercing has deleterious effect. Mostly rhinectomy defects are acquired caused by trauma or malignant diseases. Prosthetic rehabilitation is the preferred treatment of choice for any large rhinectomy defects as medical and surgical interventions are ineffective in developing esthetics. Main concern with the prosthesis for such defects is retention. This article describes rehabilitation of a patient with large size nasal defect created by chemical burn in childhood during piercing. Implant retained customized silicone nasal prosthesis was fabricated using simple O-ring attachments and innovative modified polyamide acrylic resin substructure acting as skeleton.

Restoring anterior tooth aesthetics with a Non- Rigid connector - A modified approach (Case Report)

Aesthetic anterior tooth restoration is one of the greatest challenges for dentists in clinical practice. Patients expect contemporary dentistry to provide restorations that reproduce natural beauty while ensuring stability and functionality. The Fixed dental prosthesis fabrication requires equal consideration to be given to the retainer, pontic and connector design. The excessive flexing of the long-span fixed dental prosthesis, which varies with the cube of the length of span, can lead to material failure of prosthesis or to an unfavorable response. The size, shape, and position of the connector leads to the success of prostheses, as it prevent the distortion and fracture of the prosthesis. The conventional use of a non rigid connector aids in compensating for the difference in the resistance and retention form between the abutments. This paper describes a modified technique of restoring anterior aesthetics with non rigid connector.