Dental Arch Dimensions in Class II division 1 Malocclusions with Mandibular Deficiency

Abstract Objective: To test the hypothesis that there is no difference in the dimensions of the upper and lower dental arches in Class II division 1 malocclusion with a mandibular deficiency compared to normal Class I occlusion dental arches. Materials and Methods: Photocopies of the dental arches of 48 patients exhibiting Class II division 1 malocclusion with mandibular deficiency and of 51 individuals with normal occlusion were compared. Mandibular deficiency was diagnosed clinically. All 99 individuals were in the permanent dentition. The ages of the subjects ranged from 11 years 4 months to 20 years (mean age = 12 years 5 months). Results: When compared to subjects with normal occlusion, the upper dental arches of the Class II division 1 patients presented reduced transverse dimensions and longer sagittal dimensions while the lower arches were less influenced. Conclusion: The hypothesis is rejected. Significant differences are present between the dimensions of the upper and lower dental arches in Class II division 1 malocclusion (with a mandibular deficiency and in the permanent dentition) compared to normal Class I occlusion dental arches.

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A study on Arch Widths of Bangladeshi Adult Subjects with Class II-2 malocclusion compared to those with Class II div1 malocclusion and Normal Occlusion

Bangladesh Journal of Orthodontics and Dentofacial Orthopedics ◽

10.3329/bjodfo.v3i2.24006 ◽

2015 ◽

Vol 3 (2) ◽

pp. 12-17

Author(s):

Md Masud Rana ◽

Md Zakir Hossain

Keyword(s):

Class Ii ◽

Permanent Dentition ◽

Class I ◽

P Value ◽

Normal Occlusion ◽

Significant Difference ◽

Division 1 ◽

Division 2 ◽

Dental Casts ◽

Class Ii Division 1

Aim : To evaluate the transverse discrepancy in different malocclusion groups. Also to test the hypothesisvthat models with Class II division 2 malocclusion may have mean maxillary arch widths significantly smaller than those with normal occlusions and significantly larger than those with Class II division 1 malocclusion. Thus the proposed study will generate interest among the orthodontists for further study over the transverse discrepancy of our patients and guide them to establish effective treatment strategy and their management.Methods: This study was a cross sectional study conducted among the dental casts of 150 patients and students of the Department of Orthodontics and Dentofacial Orthopedics, Dhaka Dental College and Hospital. Both male and female were included. The first group consists of 50 pair of study models with permanent dentition and diagnosed as Class I (normal) occlusion. The second group includes another 50 pair of dental casts with permanent dentition and diagnosed as Class II division 1 malocclusion . And third group includes another 50 pair of dental casts with permanent dentition and was diagnosed as Class II division 2 malocclusion. This group of malocclusion was again subdivided into two categories, Class II division 2 malocclusion with crowding and Class II division 2 malocclusion without crowding. The Students t test was used to analyze the data. In this analytical test the level of significance p value <0.05 was considered significantResults: No Statistically significant difference was observed in the maxillary inter canine, inter first premolar and inter first molar widths between class-I and Class-II div-1. Significant differences were observed between two groups. In case of mandibular inter first molar widths (p value = 0.001), and also differences in case of mandibular inter canine, inter first premolar and inter first molar widths between Class-I and Class II div 2 malocclusion p value respectively .01, 0.002,0.01.Conclusion: This study helps in determining possible differences in the dental arch widths of Bangladeshi people in Class II div 2 adults compared to adults with Class II div 1 and normal occlusion may be an important aid in further understanding of dentoalveolar characteristics of these conditions, as well as improving their management.Ban J Orthod & Dentofac Orthop, April 2013; Vol-3, No.2

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A Comparative Study of Arch Widths of Bangladeshi Subject with Normal Occlusion and Class II Division 1 Malocclusion

Bangladesh Journal of Orthodontics and Dentofacial Orthopedics ◽

10.3329/bjodfo.v2i2.16159 ◽

2013 ◽

Vol 2 (2) ◽

pp. 18-23

Author(s):

MM Islam ◽

MZ Hossain

Keyword(s):

Comparative Study ◽

Class Ii ◽

Class I ◽

Dental Arch ◽

Class Ii Malocclusion ◽

Normal Occlusion ◽

Division 1 ◽

The Mean ◽

Dental Crowding ◽

Class Ii Division 1

Aim: To evaluate possible differences of the upper and lower dental arches width among youths with Class I,normal occlusion and Class II, division 1 malocclusion. Materials and Methods: The evaluation was conducted on 100 pairs of dental casts of Bangladeshi youths with permanent dentition, 50 with Class I, normal occlusion (22 males and 28 females) at the mean age of 19±3 years and 50 with Class II, division 1, malocclusion (18 males and 32 females ) at the mean age of 20±4 years. The group with Class II malocclusion was divided into two categories: Class II without dental crowding and Class II with dental crowding. A comparison was made between the intercanine inter first premolar and intermolar widths of both dental arches. Results: Subjects with Class II, division, 1 malocclusion when compared with Class I normal occlusion presented (a) in the upper dental arch , smaller intermolar, interpremolar and intercanine width. (b) in the lower dental arch , smaller intermolar width. DOI: http://dx.doi.org/10.3329/bjodfo.v2i2.16159 Ban J Orthod & Dentofac Orthop, April 2012; Vol-2, No.2, 18-23

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Evaluation of tongue posture & dimensions in relation to skeletal Class I and Class II patterns- A cephalometric study

International Journal of Oral Health Dentistry ◽

10.18231/j.ijohd.2021.054 ◽

2021 ◽

Vol 7 (4) ◽

pp. 276-281

Author(s):

Puja Khanna ◽

Sumit Chhabra ◽

Preeti Munjal ◽

Sunny Mittal ◽

Nishtha Arora

Keyword(s):

Statistical Tests ◽

Class Ii ◽

Class I ◽

Control Group ◽

Skeletal Class ◽

Normal Occlusion ◽

Division 1 ◽

Skeletal Pattern ◽

Bonferroni Test ◽

Class Ii Division 1

Association of tongue posture with dental and facial skeletal pattern have been suggested in past. This study was undertaken to assess tongue posture and dimensions in Class I and Class II Dentoskeletal patterns to determine whether any correlation exists between tongue posture and skeletal pattern of an individual. Cephalograms of 150 individuals (aged 18-23 years), taken in Natural Head Position (NHP) and tongue at rest were divided into three groups i.e. Group 1 – Class I Normal occlusion, Group 2 – Class II Division 1 Normodivergent and Group 3 – Class II Division 1 Hypodivergent, consisting of 50 samples each. To ensure the rest position of tongue, patient was asked to relax for 30 seconds after coating the tongue with barium sulphate in midline and then to swallow, and the X-ray was taken at the end of swallowing. Each group was divided into two subgroups according to sex. Groups were constituted according to the Frankfort mandibular plane angle (FMA) angle. The subjects who had skeletal Class II pattern due to mandibular retrusion and not due to maxillary prognathism were only included in the study group. Statistical analysis was done using the software SPSS version 21.0. The statistical tests used were unpaired t-test and One-way ANOVA test with post-hoc bonferroni test. The p-value was considered significant if less than 0.05.The dorsum of the tongue was higher at back and lower in front in Class II Division 1 Hypodivergent group as compared to Class I Normal occlusion group (P<.05). Tongue height and tongue length were significantly reduced in Class II Division 1 Normodivergent and Class II Division 1 Hypodivergent malocclusion groups when compared to Class I control group (P<.05).The study supports the existence of a relationship between posture & dimensions of the tongue with Class I and Class II skeletal patterns.

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Computed Tomography Evaluation of Craniomandibular Articulation in Class II Division 1 Malocclusion and Class I Normal Occlusion Subjects in North Indian Population

ISRN Dentistry ◽

10.5402/2012/312031 ◽

2012 ◽

Vol 2012 ◽

pp. 1-5 ◽

Cited By ~ 1

Author(s):

K. C. Prabhat ◽

Sanjeev Kumar Verma ◽

Sandhya Maheshwari ◽

Ibne Ahmad ◽

Mohd. Tariq

Keyword(s):

Computed Tomography ◽

Indian Population ◽

Class Ii ◽

Class I ◽

Spiral Computed ◽

Computed Tomography Images ◽

Normal Occlusion ◽

Division 1 ◽

Joint Morphology ◽

Class Ii Division 1

Objective. The purpose of this study is to investigate the Craniomandibular articulation morphology and position of condyle in mandibular fossae in Angle’s class I normal occlusion and Angle’s class II division 1 malocclusion. Materials and Methods. The present study was conducted on 40 subjects with 20 subjects in each group, and the computed tomography images were obtained using spiral computed tomography technique. Each measurement was compared by two-factor analysis of variance (ANOVA) while changes in anterior and posterior joint spaces were done by paired t-test. Results. Statistically significant anterior positioning of condyle was observed in class I normal malocclusion, and it was significant only on right side in class II division 1 malocclusion. Conclusions. There was no difference found in the condylar process and joint morphology between right and left sides of both Angle’s Class I normal occlusion and Angle’s class II division 1 malocclusion. Evaluation of the position of the condyles in their respective mandibular fossae showed concentric position with a tendency towards anterior positioning for both right and left sides of the subjects with Angle’s Class I normal occlusion as well as subjects with Angle’s class II division 1 malocclusion.

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