Abstract
Objective: To determine maxillary and mandibular incisor inclination in Class II Division 1 malocclusion among different vertical skeletal type Chinese children.
 Materials & Method: Lateral cephalograms of Class II Division I malocclusion cases of 120 Chinese children (male-55, female-65) of the age range 12-14 years were divided into three vertical skeletal types (low angle, average angle, high angle) based on Sella-Nasion to Mandibular plane angle. To determine incisor inclination, lateral cephalometric radiographs were measured and analyzed using factorial analysis. All angular parameters were processed using ANOVA and t-test. Maxillary and mandibular incisor inclinations were discussed in detail among three vertical facial skeletal types.
 Result: The maxillary and mandibular incisors of low angle individuals were found to be proclined more than those with high and average angle individuals.
 Conclusion: Different vertical facial types of Class II Division I malocclusion in early permanent dentition accord to establish discriminate values to set up the cephalometric standards for diagnosis and treatment planning for the clinicians.
Highlights
Class II Division 1 malocclusion represents the most common skeletal discrepancy seen in orthodontic practice
The cortical plates of incisal alveolar bone is considered as the anatomic limitations for tooth movement.[2,3,4] in non-growing individuals, these anatomic limitations are considered as important factor in assessing the therapeutic effect
A retrospective study was done with 120 pretreatment lateral cephalogram records of Class II Division 1 malocclusion (55 males and 65 females) aged between 12-14 years of early permanent dentition obtained from Department of Orthodontics, The Affiliated Hospital of Stomatology, Bajracharya M : Comparison of Maxillary and Mandibular Incisor Inclination in Class II Division 1 Malocclusion among Chinese Children
Summary
Class II Division 1 malocclusion represents the most common skeletal discrepancy seen in orthodontic practice. Understanding the morphology is the key element in treatment planning of this type of malocclusion.[1] proper diagnosis of Class II Division 1 malocclusion is essential. The cortical plates of incisal alveolar bone is considered as the anatomic limitations for tooth movement.[2,3,4] in non-growing individuals, these anatomic limitations are considered as important factor in assessing the therapeutic effect. The attempt of extensive palatal movement of maxillary incisors were done by several investigators.[2,3,4,5] When roots of these teeth were brought into contact with palatal cortex, it bent and remodeled to some extent but further movement led to cortical plate penetration with subsequent bone loss and root resorption.[6,7,8,9,10,11]
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