Vinod Kumar

Abstract

Background: Endodontically treated teeth are generally weakened as a result of loss of tooth structure due to decay, previous restorative procedures and endodontic access preparation. Ideal coronal reconstruction of endodontically treated tooth is still a challenge for restorative dentistry. Post and core system is a widely used method for treatment of structurally weakened teeth. Materials and Methods: Two extracted, caries-free maxillary central incisors with straight root canal were collected and mounted. Post space preparation were done and restored with fiber post and dentin post respectively. The model is simulated using the software “Creo” and this data is then transferred to software “Hypermesh” to create a Finite Element model i.e., a mesh of nodes and elements. This mesh is programmed to contain the material properties which defined how the structure will react to loading conditions at different angles. The Analysis is carried out using the Ansys software. Results: The FEA results showed that the Dentin post have better fracture resistance. Conclusion: The comparison between fiber and dentin posts exhibited a better stress resistance of dentin post over fiber post. Further research in this regard is required to support the findings of this study results. Keywords: FEM, Dentin post, Fiber post.

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Background: Few studies have proven that urease has caries inhibiting effect. Urease enzymes hydrolyze urea into ammonia and carbon dioxide. This ammonia raises the pH value of plaque and saliva which will reduce caries activity. The aim of this investigation was to measure and compare the urease activity level before and after carbohydrate rinse in caries free and caries active children of 5-12 years. Materials and Methods: 30 caries free and 30 caries active children aged 5-12 years were selected for the study. A child was not eligible if he/she has systemic illness and received antibiotics within the last three months. DMFT/dmft was recorded to define the caries status, unstimulated saliva was collected in the eppendorf tubes and supra gingival plaque was collected from all available smooth surfaces. Urease activity was measured following biochemical protocol. Mean, standard deviation, median, and range (min.-max.) of urease activity was calculated. TheIndependent sample t test” was done to compare urease activity in both groups. Paired sample t test” was applied to knowthe change in the urease activity pre and post oral sucrose rinse in saliva and plaque Results: Increased saliva and plaque urease activity was found in caries free group compared to caries active group and in both groups urease activity increased after oral carbohydrate rinse for both saliva and plaque samples Conclusion: The strategy can be developed for carbohydrate rinse to generate higher urease activity for caries control and urease activity measurement could be considered as parameter for caries risk assessment in children. Keywords: Ammonia, Caries active, Caries free, Urease.

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Abstract

Introduction: Dental age is one of the parameter for the growth assessment and tooth calcification provides a better measure of dental age in comparison to tooth eruption. There are numerous methods available in literature to determine dental age based on tooth calcification. Nowadays Willem’s method is gaining wider recognition because many studies have proved its accuracy in various populations in Western countries but very few studies are available about its applicability to Karnataka State population (South Indian Population). Hence this study has been carried out to test the applicability of Willem’s method to the population (children) of Raichur city of Karnataka state (south Indian population). Materials and Methods: Sample size of 250 south Indian children in 6-13 years age group participated in the study out of which there were 111 females and 139 were males. Dental age was calculated using Willems method and chronological age was determined using date of birth. Pearson’s correlation coefficient and students” t” test was applied for statistical analysis of the data. Results: There was positive correlation between two ages in both genders. 0.06 years was the mean difference in total male sample and 0.07 years was the mean difference in total female sample. Conclusion: The mean difference between chronological and dental age was very minimal and both ages were positively correlated thus indicating that Willem’s method was accurately applicable to the children of Raichur city of Karnataka state (south India). To support our observations we recommend further studies with larger sample size. Keywords: Chronological age, Dental age, Willem’s method.

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