Comparison of Crown-Root Relationships of Maxillary Central Incisors in Various Malocclusions
Received: 26 November 2018
Accepted after revision: 07 February 2019
04 April 2019 (online)
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.
- 1 Mavroskoufis F, Ritchie GM. Variation in size and form between left and right maxillary central incisor teeth. J Prosthet Dent 1980; 43 (03) 254-257
- 2 Salzmann J. The face in profile; an anthropological X-ray investigation on Swedish children and conscripts. Am J Orthod 1948; 34 (08) 691-699
- 3 Andreasen V. Fine Systematische Gnathophysiognometrische Diagnose. Nor Tannlaegeforen Tid 1930; 40: 167
- 4 Taylor RM. Variation in form of human teeth: I. An anthropologic and forensic study of maxillary incisors. J Dent Res 1969; 48 (01) 5-16
- 5 Delivanis HP, Kuftinec MM. Variation in morphology of the maxillary central incisors found in class II, division 2 malocclusions. Am J Orthod 1980; 78 (04) 438-443
- 6 Backlund E. Tooth form and overbite. Trans Eur Orthod Soc 1960; 36: 97-104
- 7 Carlsson R, Rönnerman A. Crown-root angles of upper central incisors. Am J Orthod 1973; 64 (02) 147-154
- 8 Andrews LF, Schirmer L. Straight Wire. San Diego, CA: L.A. Wells Co.; 1989
- 9 Harris EF, Hassankiadeh S, Harris JT. Maxillary incisor crown-root relationships in different angle malocclusions. Am J Orthod Dentofacial Orthop 1993; 103 (01) 48-53
- 10 Bauer TJ. Maxillary central incisor crown-root relationships in class I normal occlusions and class II division 2 malocclusions. 2014
- 11 Rakosi T. An Atlas and Manual of Cephalometric Radiography. Philadelphia, PA: Lea & Febiger; 1982
- 12 Andrews LF. The six keys to normal occlusion. Am J Orthod 1972; 62 (03) 296-309
- 13 Bryant RM, Sadowsky PL, Hazelrig JB. Variability in three morphologic features of the permanent maxillary central incisor. Am J Orthod 1984; 86 (01) 25-32
- 14 Williams A, Woodhouse C. The crown to root angle of maxillary central incisors in different incisal classes. Br J Orthod 1983; 10 (03) 159-161
- 15 Shen Y, Hsu J, Wang Y, Huang H, Fuh L. The collum angle of the maxillary central incisors in patients with different types of malocclusion. J Dent Sci 2012; 7: 72-76
- 16 Shailaja AM, Gowda CN, Gowda S. The collum angle of maxillary central incisors in different skeletal malocclusions—a cephalometric study. Int J Applied Dental Sci 2016; 2 (03) 33-36