ABSTRACT
There are controversial results in the published literature about the use of primers on bonding strength of orthodontic brackets. The purpose of this study was to compare the mean shear bond strength of orthodontic brackets cured with or without the prior application of primer resins. Sixty extracted first premolars were included. In group MP, 30 teeth were cured using standardized bonding protocol including application of moisture insensitive primer resin while 30 teeth in group P were cured using standardized bonding protocol, including a step of application of conventional primer resins. Later on bonding strength was measured using universal testing machine and student's t-test was used for comparison of bond strength in both the groups. Results revealed that although bond strength values were higher in MP group but statistically insignificant differences were found in bond strength in both the groups [p 0.079]. It is concluded that there is no statistically significant difference in the shear bond strength of orthodontic brackets cured with moisture insensitive primers or with conventional primers in our present study
ABSTRACT
Deep bite is multifactorial in nature with involvement of many local dental and skeletal factors. The aim of present cross sectional study was to find out the frequency of dental and skeletal factors involved in deep bite subjects visiting department of Orthodontics, Faisalabad Medical University and de'Montmorency College of dentistry. Orthodontic models and lateral cephalograms of 100 deep bite patients were included to find out the frequency of involved dental and skeletal factors. The mean age of the sample was 20.35 +/- 3.45 years. Results showed that in dental factors, deepening of Von spee curve was the most frequent dental factor while decreased mandibular plane angle was the most frequent skeletal factor. It was concluded that deep curve of spee was the most frequent dental factor while decreased mandibular plane angle was the most frequent skeletal factor involved in deep bite subjects