Comparison of Maxillary Central Incisor Labial Crown-Root Angle with Collum Angle in Class I and Class II Division 2 Malocclusion

The angulation of the maxillary central incisor crown to its root has been measured in 191 patients representing the four classes of incisor malocclusion. Significant differences were only found between Class II Division 1 and Class II Division 2 groups.

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Comparison of Crown-Root Relationships of Maxillary Central Incisors in Various Malocclusions

Dental Journal of Advance Studies ◽

10.1055/s-0039-1685129 ◽

2019 ◽

Vol 07 (01) ◽

pp. 028-034

Author(s):

Rajwinder Brar ◽

Mandeep Bhullar ◽

Sanjay Mittal ◽

Divya Singla ◽

Isha Aggarwal

Keyword(s):

Multiple Comparisons ◽

Class Ii ◽

Class I ◽

Distributed Data ◽

Crown Root ◽

Root Angle ◽

Pearson's Correlation ◽

Two Parameters ◽

Age Range ◽

Normally Distributed

Abstract Objective The purpose of this study is to compare the crown-root and labial crown-root angles in class I, class II division (div) 1, and class II div 2 malocclusions, using cephalometric radiographs, and to find a correlation between crown-root angulation and labial crown-root angle. Materials and Methods A sample of 45 patients (23 females and 22 males) with age range from 11 to 27 years and mean age of 17 years was taken. The sample was divided into class I, class II div 2, and class II div 1 malocclusions with 15 patients in each group. The means for various parameters for each group were calculated, and multiple comparisons were made. For correlation of two parameters, Pearson's correlation was used for normally distributed data. Results Mean crown-root angle for class I was 5.8 ± 6.5; for class II div 1, it was 5.3 ± 4.2; and for class II div 2, it was 15.6 ± 9.69 degrees. Mean labial crown root angle for class I was 28.8 ± 5.8; for class II div 1, it was 27.06 ± 4.9; and for class II div 2, it was 39.8 ± 9.8 degrees. Conclusions Statistically higher values were seen for crown-root angle and labial crown-root angle in class II div 2 malocclusion. A significant correlation was seen between crown-root angle and labial crown-root angle in class I, class II div 1, and class II div 2 malocclusion.

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Correction of Class II Division 2 Malocclusion with Traumatic deep bite -Non-extraction Therapy

Bangladesh Journal of Orthodontics and Dentofacial Orthopedics ◽

10.3329/bjodfo.v5i1.35769 ◽

2018 ◽

pp. 33-36

Author(s):

Sharmin Sultana ◽

Md Zakir Hossain

Keyword(s):

Treatment Plan ◽

Class Ii ◽

Central Incisor ◽

Lower Incisor ◽

Deep Bite ◽

Maxillary Central Incisor ◽

Curve Of Spee ◽

Lower Jaw ◽

Extraction Therapy ◽

Division 2

This case report describe the management of a 22 years old male patient having class II div 2 malocclusion with traumatic deep bite. Intraoral examination revealed that patient had lingually inclined maxillary central incisor, labially flared maxillary lateral incisors, exaggerated lower curve of spee, and moderate crowding in lower jaw. Patient also tend to exhibit deep mentolabial sulcus and unaesthetic smile. Anterior flat bite plane was treatment plan for improving deep bite and also Mandibular downward backward rotation and Camouflage nonextraction treatment was decided for this patient because presence of lower crowding which is easy to correction and flare lower incisor for improving overjet and interincisal angle.Ban J Orthod & Dentofac Orthop, April 2015; Vol-5 (1-2), P.33-36

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COLLUM’S ANGLE AND CROWN ROOT ANGLE OF MAXILLARY INCISORS IN DIFFERENT MALOCCLUSIONS

Pakistan Armed Forces Medical Journal ◽

10.51253/pafmj.v71i1.4983 ◽

2021 ◽

Vol 71 (1) ◽

pp. 238-42

Author(s):

Saadia Panezai ◽

Nasrullah Mengal ◽

Sadia Nisar Ahmed

Keyword(s):

Class Ii ◽

T Test ◽

Process Data ◽

Cross Sectional ◽

Root Angle ◽

Lateral Cephalograms ◽

Division 1 ◽

Collum Angle ◽

Division 2 ◽

Class Ii Division 1

Objective: To determine Collum angle and crown to root angle of maxillary central incisor in different skeletalmalocclusion. Study Design: Comparative cross sectional study. Place and Duration of Study: Orthondontics department, Bolan Medical College, Civil Sandman Hospital,Quetta, from Jun to Dec 2018. Methodology: Data sample consisted of 140 lateral cephalograms. Sample consisted of 74 female cephalograms and 66 male cephalograms. The mean age of sampled subjects ranged between 21.62 ± 5.96 years. The Colum angle of the maxillary central incisors in each group was measured. SPSS version 21 was used to enter and process data. Comparison between Class II division 1 and division 2 collum angles was made by applying student t-test. Results: The average value for Collum angle in class II division 1 sample was 4.38 ± 3.08 with minimum being 0and maximum 15 degree. The average values for Class II division 2 was 10.52 ± 4.37 with minimum 30 and amaximum 23 degree. Conclusion: Maxillary central incisors in all malocclusions had significantly different mean Collum angles fromzero. Paired sample t-test comparison showed that the Collum angle for maxillary central was much higher inClass II division 2.

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Influence of Morphology of Maxillary Central Incisor on Expression of Torque using 2D Surface Scanning and Confirmation with 3D Photographic Model: An in vitro Study

World Journal of Dentistry ◽

10.5005/jp-journals-10015-1252 ◽

2014 ◽

Vol 5 (1) ◽

pp. 21-27 ◽

Cited By ~ 2

Author(s):

Achint Devendra Chachada

Keyword(s):

In Vitro Study ◽

Mean Value ◽

Scanning System ◽

Central Incisor ◽

Surface Scanning ◽

Maxillary Central Incisor ◽

Average Value ◽

Crown Root ◽

Root Angle

ABSTRACT The aim of present study was to evaluate the influence of convexity of upper central incisor on expression of torque. The variation in crown root angle of maxillary central incisor and the co-relation between crown root angle and convexity of crown of maxillary central incisor was also assessed. Thirty extracted maxillary central incisors and a central incisor bracket (American Orthodontics—Roth prescription 0.018 inch slot) were used for the study. The study was carried out in three parts. In first part, proximal radiographs of each sample were traced and crown to root angle was measured. In second part, labial surface each sample was scanned using cyclone scanning system (Renishaw) to obtain profile image of each sample which were analyzed using AutoCAD 2002 software. Convexity of labial surfaces at various heights, i.e. X + 1, X + 2, X + 3, X – 1, X – 2, X – 3 was measured. Third part consisted of preparation of 3D photographic model of one randomly selected sample using Stereo Scan 3D (Breuckmann) machine and 3D composite image of central incisor bracket using Esson optical profile projector. Torque values at X + 1, X + 2, X + 3, X – 1, X – 2, X – 3 were 2.27°, 5.08°, 8.96°, –5.01°, –8.35° and –12.33° respectively and mean value of crown to root angle of all 30 studied samples was 180.27°. It was concluded that when bracket is displaced 1, 2 or 3 mm incisally, there is increase in lingual root torque by an average value of 2.27°, 5.08° or 8.96° respectively while when bracket is displaced 1, 2 or 3 mm gingivally, there is decrease in lingual root torque or increase in labial root torque by an average value of 5.01°, 8.35° or 12.33° respectively. These findings were confirmed on analysis of 3D photographic model of one randomly selected sample. How to cite this article Chachada AD, Kamble RH. Influence of Morphology of Maxillary Central Incisor on Expression of Torque using 2D Surface Scanning and Confirmation with 3D Photographic Model: An in vitro Study. World J Dent 2014;5(1):21-27.

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Maxillary central incisor crown-root relationships in class I normal occlusions and class III open and deep malocclusions

10.17077/etd.3m3hm2ph ◽

2015 ◽

Author(s):

Jessica Kay Fuller

Keyword(s):

Class I ◽

Central Incisor ◽

Class Iii ◽

Maxillary Central Incisor ◽

Crown Root

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Relationship between crown-root angulation (collum angle) of maxillary central incisors in Class II, division 2 malocclusion and lower lip line

ORTHODONTICS The Art and Practice of Dentofacial Enhancement ◽

10.11607/ortho.841 ◽

2013 ◽

Vol 14 (1) ◽

pp. e66-e74 ◽

Cited By ~ 5

Author(s):

Bhadrinath Srinivasan ◽

Vignesh Kailasam ◽

Arun Chitharanjan ◽

Arthi Ramalingam

Keyword(s):

Class Ii ◽

Lower Lip ◽

Crown Root ◽

Collum Angle ◽

Division 2

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Comparison of Collum Angle of Maxillary Central Incisor in High Angle and Low Angle Patients

Journal of The Pakistan Dental Association ◽

10.25301/jpda.302.113 ◽

2021 ◽

Vol 30 (02) ◽

pp. 113-117

Author(s):

Erum Behroz ◽

◽

Hafiz Zuhair Ahmed ◽

S.M. Tariq Rafi ◽

Tabassum Ahsan Qadeer ◽

...

Keyword(s):

Growth Pattern ◽

Orthodontic Treatment ◽

Class Ii ◽

Central Incisor ◽

High Angle ◽

Maxillary Central Incisor ◽

Division 1 ◽

The Mean ◽

Collum Angle ◽

Class Ii Division 1

OBJECTIVE: This study aims to determine the mean collum angle of maxillary central incisor and to compare it between high angle and low angle patients undergoing orthodontic treatment. METHODOLOGY: This cross-sectional, observational study was conducted using lateral cephalometric radiographs of 61 class II division 1 patients (comprised 32 males, 29 females, age range 13 to 30 years) from the record files of patients inducted for Orthodontic management from June 2020 till August 2020 at the Department of Orthodontics, Sindh Institute of Oral Health Science, Jinnah Sindh Medical University, Karachi, Pakistan. The sample was divided on the basis of Vertical Analysis (angulation of mandibular plane) into high and low angle cases. Collum angle was measured using the angulation of the Maxillary Central Incisor (MCI). Student t-test was used to compare the mean difference of the collum angle between skeletal vertical malocclusions. RESULTS: Mean value of the collum angle for high angle (Vertical Growth pattern) cases were mean ± standard deviation (4.35°±1.49°) while for low angle groups (Horizontal Growth pattern) were (2.41°±1.60°). CONCLUSION: There Collum angle of permanent maxillary central incisors differ significantly (p<0.001) among high angle and Low angle malocclusions cases (n=61) and showed pronounced axial bending in Class II division 1 incisors with high angle (4.35° ± 1.49°) as compared to low angle malocclusion (2.41° ± 1.60°). KEYWORDS: Collum Angle, Maxillary Central Incisor, Orthodontic Treatment, High Angle, Low Angle.

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