Relationship Between Crown-to-Root Angulation of Maxillary Central Incisor and Lower Lip Line In Different Malocclusions: Crown-to-Root Angulation of Maxillary Central Incisor

Sameera Jamshed Ali  Khan; Zubair Hassan  Awaisi; Zubair  Ahmed

doi:10.54393/pjhs.v4i04.215

Authors

Sameera Jamshed Ali Khan Department of Orthodontics, Nishtar Institute of Dentistry, Multan, Pakistan
Zubair Hassan Awaisi Department of Orthodontics, Nishtar Institute of Dentistry, Multan, Pakistan
Zubair Ahmed Department of Orthodontics, Nishtar Institute of Dentistry, Multan, Pakistan

DOI:

https://doi.org/10.54393/pjhs.v4i04.215

Keywords:

Lower Lip-Line, Collum Angle, Class II Div-II Malocclusion, Crown-Root Angle

Abstract

Collum angle, supplementary angle between longitudinal axis of crown-to-root, is an important consideration in patients receiving orthodontic treatment This angulation in labio-lingual direction is a key factor for proper occlusion and is greatly affected by lower lip line levels in different malocclusions. Objective: To find the relationship between collum angle of maxillary central incisor and lower lip line in patients presenting with different malocclusions. Methods: Cross-sectional, Comparative Study conducted in Orthodontics department of Nishtar Institute of Dentistry, Multan.From September 2020 to February 2021. Lateral cephalometric radiographs of 105 patients (39 males and 66 females)were selected with age range of 9-30 years. Patients were divided in 4 groups i.e Class I, Class II div I, Class II div II and class III. Collum angle was measured along with assessing lower lip-line level with central incisor. One-way ANOVA test was applied to compare level of lower lip and collum angle. Results: Mean value of collum angle was 5.82˚±5˚ for class I, 3.68˚ ± 9˚ for class II div I, 11.7˚± 5˚ for class II div II, and 6.88˚± 7 ˚for class III. Collum angle of maxillary central incisor was greatly increased in patients with class II div II malocclusion than other groups. Conclusions: Collum angle found to be highest in class II div II malocclusion group. Lower lip line resting on middle third level of maxillary central incisor crown in div II group explains this exceeding value of collum angle

References

Haralur SB, Lahig AA, Al Hudiry YA, Al-Shehri AH, Al-Malwi AA. Influence of Post Angulation between Coronal and Radicular Segment on the Fracture Resistance of Endodontically Treated Teeth. Journal of Clinical Diagnostic Research. 2017 Aug; 11(8): 90-3. doi: 10.7860/JCDR/2017/27965.10470.

Nouri M, Hosseini SK, Asefi S, Abdi AH, Bagheban AA. Three-dimensional measurement of tooth inclination: A longitudinal study. Dental Research Journal. 2019 Jul; 16(4): 225-32. doi: 10.4103/1735-3327.261127.

Bryant RM, Sadowsky PL, Dent M, Hazelrig JB. Variability in three morphologic features of the permanent maxillary central incisor. American Journal of Orthodontics. 1984 Jul; 86(1): 25-32. doi: 10.1016/0002-9416(84)90273-2.

McIntyre GT and Millett DT. Crown-root shape of the permanent maxillary central incisor. Angle Orthodontics. 2003 Dec; 73(6): 710-5.

Shen YW, Hsu JT, Wang YH, Huang HL, Fuh LJ. The Collum angle of the maxillary central incisors in patients with different types of malocclusion. Journal of Dental Sciences. 2012 Mar; 7(1): 72-6. doi: 10.1016/j.jds.2012.01.010.

Nandeshwar N, Banerjee S, Shenoy U, Akhare P, Hazarey A, Karia H, Bhattacharya S. Comparative evaluation of collum angle of maxillary central incisor in patients with angles class i, class ii division 1 and class ii division 2 malocclusions–a cephalometric study. Contemporary Research Journal of Medical Sciences. 2018 Jun; 2(1): 1-8.

Israr J, Bhutta N, Rafique Chatha M. Comparison of collum angle of maxillary central incisors in class ii div 1 & 2 malocclusions. Pakistan Oral & Dental Journal. 2016 Mar; 36(1): 91-4.

Taylor RM. Variation in form of human teeth: I. An anthropologic and forensic study of maxillary incisors. Journal of Dental Research. 1969 Jan; 48(1): 5-16. doi: 10.1177/00220345690480012501.

Pai SS, Panda S, Pai V, Anandu M, Vishwanath E, Suhas AS. Effects of labial and lingual retraction and intrusion force on maxillary central incisor with varying collum angles: A three-dimensional finite elemental analysis. Journal of Indian Orthodontic Society. 2017 Jan; 51(1): 28-37. doi: 10.4103/0301-5742.199252.

British Standards Institution. British standard glossary of dental terms. British Standards Institution; 1983.

Andrews LF. The six keys to normal occlusion. American Journal of orthodontics. 1972 Sep; 62(3): 296-309. doi: 10.1016/S0002-9416(72)90268-0.

Patel P, Shanthraj R, Garg N, Vallakati A, Ashwini B. Treatment of Class II division 2 malocclusion with impacted lower canine. International Journal of Orthodontic Rehabilitation. 2016 Oct; 7(4): 148. doi: 10.4103/2349-5243.197464.

Shailaja AM, Gowda NC, Gowda S. The collum angle of Maxillary Central Incisors in different skeletal malocclusions–A Cephaometric study. International Journal of Applied Dental Sciences. 2016 Jun; 2(03): 33-6.

Gomaa N, Elmarhoumy S, Fakhry N. Maxillary Central Incisors’ collum angle in different skeletal vertical malocclusions–A Cephaometric study. Egyptian Dental Journal. 2019 Jan; 65(1): doi: 1-7. 10.21608/edj.2019.71240.

Srinivasan B, Kailasam V, Chitharanjan A, Ramalingam A. Relationship between crown-root angulation (collum angle) of maxillary central incisors in Class II, division 2 malocclusion and lower lip line. ORTHODONTICS: The Art & Practice of Dentofacial Enhancement. 2013 Mar; 14(1): 66-74. doi: 10.11607/ortho.841.

Backlund ER. Tooth form and overbite. Transaction of the European Orthodontic Society. 1960; 36(1): 97-03.

Logan WR. Deckbiss-a clinical evaluation. Transaction of the European Orthodontic Society. 1959; 35: 313-7.

Lapatki BG, Mager AS, Schulte-Moenting J, Jonas IE. The importance of the level of the lip line and resting lip pressure in Class II, Division 2 malocclusion. Journal of Dental Research. 2002 May; 81(5): 323-8. doi: 10.1177/154405910208100507.

Williams A and Woodhouse C. The crown to root angle of maxillary central incisors in different incisal classes. British Journal of Orthodontics. 1983 Jul; 10(3): 159-61. doi: 10.1179/bjo.10.3.159.

Khalid Z, Iqbal K, Khalid S, Riaz A, Jan A. Comparison of collum angle of maxillary central incisors in different incisor relationships. Journal of College of Physicians Surgeons Pakistan. 2020 May; 30(05): 471-5. doi: 10.29271/jcpsp.2020.05.471.

Dubois G, Daas M, Bonnet AS, Lipinski P. Biomechanical study of a prosthetic solution based on an angled abutment: Case of upper lateral incisor. Medical Engineering & Physics. 2007 Nov; 29(9): 989-98. doi: 10.1016/j.medengphy.2006.10.017.