Abstract
Objectives The current study aimed to predict the combined mesiodistal crown widths of maxillary and mandibular canines and premolars from the combined mesiodistal crown widths of maxillary and mandibular incisors and first molars. Materials and Methods This retrospective study utilized 120 dental models from Iraqi Arab young adult subjects with normal dental relationships. The mesiodistal crown widths of all teeth (except the second molars) were measured at the level of contact points using digital electronic calipers. The relation between the sum mesiodistal crown widths of the maxillary and mandibular incisors and first molars and the combined mesiodistal crown widths of the maxillary and mandibular canines and premolars was assessed using Pearson's correlation coefficient test. Based on this relation, regression equations were developed to predict the sum widths of maxillary and mandibular canines and premolars; then, the predicted mesiodistal crown sum widths were compared with the actual one using a paired sample t-test. Results Statistically, the predicted mesiodistal crown sum widths were nonsignificantly different from the actual ones. Conclusions The combined mesiodistal widths of maxillary and mandibular canines and premolars can be predicted successfully from the combined mesiodistal widths of the maxillary and mandibular incisors and first molars with a high degree of accuracy reaching to more than 86%.
Highlights
During orthodontic assessment for space analysis in the period of mixed dentition, it is imperative to reach a precise prediction for the available space that will house the unerupted canines and premolars in order to develop an appropriate treatment plan for extraction or nonextraction therapy [1]
E major idea behind this study was to develop regression equations that were used to predict the sum mesiodistal crown diameters of canines and both premolars in both genders and arches based on the sum crown diameters of the maxillary and mandibular incisors and first molars in the mixed dentition stage in order to prevent further development of malocclusion like crowding or space loss of permanent teeth. is procedure will pass in four steps: (1) Assessing the relationships between the sum mesiodistal crown diameters of canines and both premolars with the sum crown diameters of the maxillary and mandibular incisors and first molars in both genders and jaws
Higher mean values were found for male teeth (Table 2), confirming the fact that males have larger teeth than females [2, 5, 17, 18]; a specific regression equation was developed for each gender. is equation was applied as Y a + b X, where “Y” is the sum mesiodistal crown widths of the mandibular or maxillary permanent canines and premolars, “X” is the sum mesiodistal crown widths of the maxillary and mandibular incisors and first molars, “a” is a constant, and “b” is the regression coefficient (Table 3)
Summary
During orthodontic assessment for space analysis in the period of mixed dentition, it is imperative to reach a precise prediction for the available space that will house the unerupted canines and premolars in order to develop an appropriate treatment plan for extraction or nonextraction therapy [1].Precision, safety, and ease are crucial principles for a predictive method to become an element of the inclusive case analysis in current orthodontic practice [2].Average teeth width was first studied by Dr G. During orthodontic assessment for space analysis in the period of mixed dentition, it is imperative to reach a precise prediction for the available space that will house the unerupted canines and premolars in order to develop an appropriate treatment plan for extraction or nonextraction therapy [1]. Safety, and ease are crucial principles for a predictive method to become an element of the inclusive case analysis in current orthodontic practice [2]. Average teeth width was first studied by Dr G. Due to individual variations in teeth size in different genders and race groups, Black’s work was not precise. Tanaka and Johnston [4] and Moyers [5] developed the two most popular methods to predict unerupted canine and premolar crown diameters
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