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Angle of Convergence of Posterior Crown Preparations Made by Predoctoral Dental Students
Author(s) -
Alhazmi Muntaha,
ElMowafy Omar,
Zahran Mohamed H.,
Uctasli Sadullah,
Alkumru Hassan,
Nada Kareem
Publication year - 2013
Publication title -
journal of dental education
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 68
eISSN - 1930-7837
pISSN - 0022-0337
DOI - 10.1002/j.0022-0337.2013.77.9.tb05582.x
Subject(s) - protractor , crown (dentistry) , dentistry , molar , significant difference , orthodontics , mathematics , mean difference , analysis of variance , medicine , geometry , statistics , confidence interval
The aim of this study was to determine angle of convergence (AC) of posterior crown preparations made by predoctoral dental students at the University of Toronto. Ninety–one dies of students’ crown preparations were digitally scanned with an in–Eos–Blue scanner (Sirona). Created images were virtually sliced at three similar locations of mesiodistal and buccolingual planes. Virtual protractor was used to determine AC of each section. Means and SDs were calculated, and data were statistically analyzed with ANOVA and student's t–test for operator's gender, experience, and tooth type. There were no significant differences among the groups except for AC of preparations grouped by tooth type (p<0.0001). The greatest mean mesiodistal AC was 26.4° found with mandibular molars, while the smallest was 16° found with maxillary premolars. ANOVA revealed significant difference in mean mesiodistal AC among groups (p<0.01). Also, greatest mean buccolingual AC was 25° found with mandibular molars, while the smallest was 20.8° found with maxillary premolars. ANOVA did not reveal significant difference in mean buccolingual AC among groups (p>0.05). Overall mean AC values were greater than ideal range of 2–5°; however, they were within ranges published for dentists/prosthodontists. Gender and experience had no significant effect on AC, but tooth type significantly affected AC.