Abstract
Objectives: To determine and analyze the maxillary incisal jaw bone thickness among different vertical skeletal facial types of Class II Division 1 malocclusion.
 Materials and method: The samples (n=121) between 12-14 yrs of age were divided into three groups (low angle, average angle, high angle) based on their SN-MP angle. Linear measurements were processed and analyzed statistically. The characteristics of abnormal incisor jaw bone thickness at upper and lower incisors among three vertical facial skeletal types were studied in detail.
 Results: At the upper and lower central incisors low angle individuals presented greater dentoalveolar, basal bone thickness than high and average angle individuals. The distance from the root apex of upper and lower central incisors were far away from the lingual cortex in low angle than high angle individuals.
 Conclusion: Among different vertical facial types with Class II Division 1 malocclusion in early permanent dentition may accord to establish discriminate values as a sample to set up the cephalometric standard for the appropriate diagnosis to provide better treatment plan for the clinicians.
Highlights
Orthodontists have been interested in the multitude of differences in diagnosis and treatment response between different vertical skeletal patterns
The attempt of extensive palatal movement of maxillary incisors were done by several investigators.[2,3,4,5]. Roots of these teeth brought into contact with palatal cortex led to bend and remodel to some extent; further orthodontic tooth movement led to cortical plate penetration and subsequent bone loss and root resorption.[9,12,13,14,15,16]
The purpose of this study was to investigate how much retraction of maxillary incisors were possible for overjet correction and anterior maxillary and mandibular cortical bone remodeling by determining and analyzing incisal jaw morphology of maxillary bone in Class II Division 1 malocclusion among the Chinese population
Summary
Orthodontists have been interested in the multitude of differences in diagnosis and treatment response between different vertical skeletal patterns. The principle objective of treating Class II Division 1 malocclusion is the reduction in the overjet and is usually performed in the mixed dentition. The purpose of this study was to investigate how much retraction of maxillary incisors were possible for overjet correction and anterior maxillary and mandibular cortical bone remodeling by determining and analyzing incisal jaw morphology of maxillary bone in Class II Division 1 malocclusion among the Chinese population
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