Association between Crowding and the Effective Maxillary and Mandibular Length among Orthodontic Patients of Kathmandu, Nepal.
Abstract
Background: During orthodontic consultation, the most frequent major complaint of the patients is dental crowding, which is caused by a disparity between the arch length and tooth size.
Objective: The purpose of this study was to evaluate the association between crowding and the effective maxillary and mandibular length in Nepalese orthodontic patients.
Methods: The orthodontic records of 390 people (from January 2018 to December 2020) were randomly selected and classified into three skeletal malocclusions based on the ANB angle (Angle formed by point A and point B at the nasion). Subjects with skeletal malocclusions were subdivided into two groups depending on the degree of crowding in the mandibular arch: Group 1 had crowding of < 3mm, and Group 2 had crowding of >3mm. On pretreatment casts, digital vernier calipers (Digimatic, Precise, India) were used to assess dental arch crowding, whereas, on a pretreatment lateral cephalogram, digital cephalometric analysis (Vistadent OC 1.1, USA) was done to quantify effective maxillary and mandibular length. Inter-group comparisons were assessed using a one-way analysis of variance. The correlation was assessed by Pearson’s correlation coefficient (p≤0.05).
Results: There was a statistically significant difference in effective maxillary and mandibular length among skeletal malocclusions (p<0.05). Skeletal Class II malocclusion had the greatest mandibular crowding, while skeletal Class III malocclusion had the least. The effective maxillary and mandibular lengths and dental crowding had a significant but weak inverse correlation, whereas a strong but moderate positive correlation existed between the maxillary and mandibular effective lengths (r=0.674) and also between maxillary and mandibular crowding (r=0.631).
Conclusion: Effective maxillary length was highest in skeletal class II malocclusion whereas effective mandibular length was highest in skeletal class III malocclusion. The shorter effective maxillary and mandibular lengths showed a weak association with dental crowding.
References
Doris JM, Bernard BW, Kuftinec MM, Stom D. A biometric study of tooth size and dental crowding. Am J Orthod. 1981;79(3):326-336. https://doi.org/10.1016/0002-9416(81)90080-4 [PubMed] [Full Text] [Google Scholar]
Lavelle CL. Crowding and spacing within the human dental arch of different racial groups. Arch Oral Biol. 1970;15(11):1101-1103. https://doi.org/10.1016/0003-9969(70)90123-8 [PubMed] [Full Text] [Google Scholar]
Sato A. Longitudinal study of dental arch forms, with special reference to normal and malocclusions]. Aichi Gakuin Daigaku Shigakkai Shi. 1989;27(3):635-672. [PubMed] [Google Scholar]
Radnzic D. Dental crowding and its relationship to mesiodistal crown diameters and arch dimensions. Am J Orthod Dentofac Orthop.1988;94(1):50-56. https://doi.org/10.1016/0889-5406(88)90450-7 [PubMed] [Full Text] [Google Scholar]
Howe RP, McNamara JA, O’Connor KA. An examination of dental crowding and its relationship to tooth size and arch dimension. Am J Orthod. 1983;83(5):363-373. https://doi.org/10.1016/0002-9416(83)90320-2 [PubMed] [Full Text] [Google Scholar]
Peck S, Peck H. Crown dimensions and mandibular incisor alignment. Angle Orthod. 1972;42(2):148-153. https://doi.org/10.1043/0003-3219(1972)042<0148:CDAMIA>2.0.CO;2 [PubMed] [Full Text] [Google Scholar]
Lundstro ̈m A. The aetiology of crowding of the teeth (based on studies of twins and on morphological investigations) and its bearing on orthodontic treatment. Trans Eur Orthod Soc. Published online 1951:176-189. [Google Scholar]
Janson G, Goizueta OEFM, Garib DG, Janson M. Relationship between maxillary and mandibular base lengths and dental crowding in patients with complete Class II malocclusions. Angle Orthod. 2011;81(2):217-221. https://doi.org/10.2319/062110-338.1 [PubMed] [Full Text] [Google Scholar]
Barber TK. The crowded arch. J - South Calif Dent Assoc. 1967;35(5):232-240. [PubMed] [Google Scholar]
Hooten E. Up from the Ape. The Macmillan Company, New York; 1947. [Full Text]
Bernabé E, del Castillo CE, Flores-Mir C. Intra-arch occlusal indicators of crowding in the permanent dentition. Am J Orthod Dentofac Orthop. 2005;128(2):220-225. https://doi.org/10.1016/j.ajodo.2004.04.026 [PubMed] [Full Text] [Google Scholar]
Shigenobu N, Hisano M, Shima S, Matsubara N, Soma K. Patterns of dental crowding in the lower arch and contributing factors. A statistical study. Angle Orthod. 2007;77(2). https://doi.org/10.2319/0003-3219(2007)077[0303:PODCIT]2.0.CO;2 [PubMed] [Google Scholar]
Sakuda M, Kuroda Y, Wada K, Matsumoto M. Changes in crowding of the teeth during adolescense and their relation to growth of the facial skeleton. Trans Eur Orthod Soc. Published online 1976:93-104. [Full Text] [Google Scholar]
Leighton BC, Hunter WS. Relationship between lower arch spacing/crowding and facial height and depth. Am J Orthod. 1982;82(5):418-425. https://doi.org/10.1016/0002-9416(82)90191-9 [PubMed] [Full Text] [Google Scholar]
Nance HN. The limitations of orthodontic treatment; diagnosis and treatment in the permanent dentition. Am J Orthod. 1947;43(43rd Annual Meeting):36-84. https://doi.org/10.1016/0096-6347(47)90123-3 [PubMed] [Full Text] [Google Scholar]
Türkkahraman H, Sayin MO. Relationship between mandibular anterior crowding and lateral dentofacial morphology in the early mixed dentition. Angle Orthod. 2004;74(6):759-764. https://doi.org/10.1043/0003-3219(2004)074<0759:RBMACA>2.0.CO;2. [PubMed] [Full Text] [Google Scholar]
Dhopatkar A, Bhatia S, Rock P. An investigation into the relationship between the cranial base angle and malocclusion. Angle Orthod. 2002;72(5):456-463. https://doi.org/10.1043/0003-3219(2002)072<0456:AIITRB>2.0.CO;2 [PubMed] [Full Text] [Google Scholar]
Khoja A, Fida M, Shaikh A. Association of maxillary and mandibular base lengths with dental crowding in different skeletal malocclusions. J Ayub Med Coll Abbottabad JAMC. Published online 2014. https://doi.org/10.4172/2247-2452.S1.010 [PubMed] [Full Text] [Google Scholar]
Baccetti T, Reyes BC, McNamara JA. Gender differences in Class III malocclusion. Angle Orthod. 2005;75(4):510-520. https://doi.org/10.1043/0003-3219(2005)75[510:GDICIM]2.0.CO;2 [PubMed] [Full Text] [Google Scholar]
Ursi WJ, Trotman CA, McNamara JA, Behrents RG. Sexual dimorphism in normal craniofacial growth. Angle Orthod. 1993;63(1):47-56. https://doi.org/10.1043/0003-3219(1993)063<0047:SDINCG>2.0.CO;2 [PubMed] [Full Text] [Google Scholar]
Foster TD, Hamilton MC, Lavelle CL. A study of dental arch crowding in four age-groups. Dent Pract Dent Rec. 1970;21(1):9-12. [PubMed] [Full Text] [Google Scholar]
Lavelle CL, Foster TD. Crowding and spacing of the teeth in an adult British population. Dent Pract Dent Rec. 1969;19(7):239-242. [PubMed] [Google Scholar]
Fastlicht J. Crowding of mandibular incisors. Am J Orthod. 1970;58(2). https://doi.org/10.1016/0002-9416(70)90069-2. [PubMed] [Full Text] [Google Scholar]
Strujić M, Anić-Milosević S, Mestrović S, Slaj M. Tooth size discrepancy in orthodontic patients among different malocclusion groups. Eur J Orthod. 2009;31(6):584-589. https://doi.org/10.1093/ejo/cjp013. [PubMed] [Full Text] [Google Scholar]
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