Background: To evaluate the prevalence of dental ankylosis in primary molar. Materials & Methods: A total of 50 primary molars were enrolled. The age of patients was 6 to 10 years. 18 were girls and 10 were boys. Radiographic examination was done. The diagnosis was informed by the presence of different degrees of infraocclusion and the appearance of adjacent bone (The loss of periodontal space). The ankylosed tooth was compared with the corresponding molar in the opposite quadrant. Data was collected and result was analysed using chi-squared test and SPSS software. Results: A total of 50 primary molars were enrolled. According to location, ankylosed teeth were more in the lower jaw as 90% as compared to the upper jaw i.e 10%. The third quadrant has the more number of ankylosed tooth i.e 56% followed by fourth quadrant i.e 34%. Conclusion:The prevalence of dental ankylosis was higher in the third quadrant, especially in the first primary molars.

Background: To evaluate the nitrous oxide-oxygen inhalation sedation during inferior alveolar block administration in children. Materials & Methods:A total of 50 children of age 7-10 years, with a treatment plan of extraction of primary teeth were enrolled in the study. They were divided into 2 groups as N2O-O2 and oxygen. Those who presented with clinical conditions contraindicating the use of N2O-O2 or having known allergy to lignocaine were excluded from the study. Data was collected and result was analysed using SPSS software. The level of significance was at p≤0.05. Results: A total of 50 children were enrolled, 25 in each group. There was a significantly lower pain reaction to local anesthetic administration in the N2O-O 2 group (p<0.01). Scoring was done. In O2 administrated patients, 84% were in deep sedation during and even after the procedure. In N2O-O2, 32% patients were in light sedation after the procedure whereas 20% were in light sedation during the procedure. Conclusion: N2O-O2 inhalation showed better results as vital signs were normal and treatment completed successfully.