Objective: The study was conducted to evaluate stress pattern and deformation in mid-palatal suture and posterior dentoalveolar area during maxillary expansion therapy with two different types of rapid maxillary expansion by finite element method study. Methods and Methodology: The finite element analysis was performed on a model of maxilla, with narrow maxillary base and teeth digitally reconstructed, based on CBCT images, acquired by child (age 12.5 years) but not in permanent dentition stage from available pool data. Result: More amount of stress was observed in mid-palatal suture and posterior dental alveolar area by using the Hyrax appliance as compared to the Haas appliance. Stress pattern evaluated in mid-palatal suture depicts maximum stress concentration on the anterior region of mid-palatal suture at the position of incisive papilla. Deformation in maximum quantity is observed in central incisors. Maximum stress generation and deformation are observed in lingual region of premolar and molar areas. Minimum stress generation and deformation are observed in the posterior part of last molars. Conclusion: Hyrax produces more stress and deformation in mid-palatal suture as well as in the posterior alveolar segment in comparison to Haas appliance. Better results in the immediate skeletal response were obtained by the Hyrax-type expander as compared to the Haas type.

Objective: To evaluate the biofilm adhesion to 4 types of ‘as retrieved’ archwires during orthodontic treatment. To compare biofilm formation by viable cell counting (colony-forming units [CFU]) of microbes ( Staphylococcus aureus, Streptococcus mutans and Candida albicans). Methods: The study was conducted on 40 patients who were divided into 4 equal groups based on the type of archwire of same cross-section (0.019" × 0.025"): group 1—copper-nickel titanium (Cu-NiTi); group 2—titanium molybdenum alloy (TMA); group 3—stainless steel (SS); and group 4—aesthetic coated SS. After 1 month of fixed orthodontic therapy, the archwires were removed carefully from the oral cavity. Results: Biofilm absorbance and biofilm concentration were significant ( P ≤ .05) in all the 4 groups. Conclusion: The group 2 wire showed the maximum affinity for biofilm absorbance and biofilm concentration, whereas the group 4 wire showed the least affinity. The group 4 wire promoted less retention of oral bacteria compared with the wires of the other groups, whereas the group 1 wire showed maximum retention. In the present study, all types of wire showed maximum affinity for S mutans and the least affinity for C albicans, except for the group 1 wire, which showed maximum affinity for S aureus. Biofilm adhesion could be a significant determining factor in the selection of orthodontic archwire for patients primarily at risk of dental caries or periodontal diseases, or both.

Introduction:In the field of Orthodontics and Dentofacial Orthopedics, in-depth knowledge of incisor inclination & dentoalveolar height in different facial growth patterns is essential to reach ideal treatment for every patient. Objectives: Assess and compare anterior and posterior dentoalveolar height and incisor inclination in maxilla and mandible in different facial growth pattern in vertical plane. Materials and Methods: In this study, lateral cephalogram of total 90 patients were traced. The sample was divided into horizontal, average and vertical growth pattern based on Jarabak's ratio. The maxillary and mandibular incisor inclination and dentoalveolar height of anterior and posterior region were evaluated and analysed statistically. Results: This study revealed that incisor inclination and dentoalveolar height showed statistically significant difference among different growth patterns. Incisor inclination and anterior dentoalveolar height in maxilla and mandible were increased in vertical growth pattern. Posterior dentoalveolar heights were also more in maxilla and mandible but the result was not statistically significant. Conclusion: This study showed that there is a statistically significant relationship between incisor inclination, dentoalveolar height and facial growth pattern of an individual.