Association of Bolton Discrepancy with Arch form and Sagittal Molar Relationship
DOI:
https://doi.org/10.52206/jsmc.2025.15.2.990Abstract
Background: The Bolton analysis evaluates tooth size discrepancies to ensure optimal occlusion, with its influence across sagittal molar classes and arch forms remaining unclear.
Objective: To compare anterior and overall Bolton ratios across different sagittal molar classes (Class I, II, III) and arch forms (ovoid, square, tapered) in orthodontic patients aged 13 to 35 years
Materials and Methods: This cross-sectional comparative study was conducted on 90 cases, using consecutive, non-probability sampling techniques. Inclusion criteria included dental cases of both genders aged 13 to 35 years with all anterior permanent teeth erupted and in good quality study casts. Exclusion criteria included mesiodistal loss or excess of tooth material due to caries or restorations, prosthetic replacements of teeth, previous orthodontic treatment, or transverse discrepancies such as crossbite or scissors bite. Measurements of the mesiodistal width of twelve teeth in each arch were taken using a digital vernier caliper. ANOVA test was run to compare ratios among different classes and arch forms.
Results: The mean age of participants was 20.59±5.59 years. Gender distribution was 51.11% females and 48.89% males. The comparison of anterior and overall Bolton ratios among different sagittal molar classes revealed no significant differences: class I had ratios of 91.41±2.21 (overall) and 77.41±2.21 (anterior), class II had ratios of 91.54±2.37 (overall) and 77.54±2.37 (anterior), and class III had ratios of 91.79±1.69 (overall) and 77.79±1.69 (anterior). The comparison among different arch forms also showed no significant differences: ovoid arch form had ratios of 91.95±1.92 (overall) and 77.95±1.92 (anterior), square arch form had ratios of 91.35±2.41 (overall) and 77.35±2.41 (anterior), and tapered arch form had ratios of 91.12±1.79 (overall) and 77.12±1.79 (anterior).
Conclusion: Bolton discrepancy is not influenced by sagittal molar class or arch form, regardless of gender.
Keywords: Angle's classification, Arch forms, Bolton ratio, Dental discrepancies, Orthodontics, Sagittal molar classes.
References
Abd Rahman ANA, Othman SA, Marya A. Measuring tooth size discrepancies using Bolton analysis: a comparative cross-sectional study among major ethnicity in Malaysia. BMC oral health. 2023;23(1):534. https://doi.org/10.1186/s12903-023-03185-7
Al Maaitah EF, Al-Madani N, Abu Alhaija ES. Tooth size discrepancy in orthodontic patients with skeletal anterior open bite. Clin Experiment Dent Res. 2022 Dec;8(6):1516-22. https://doi.org/10.1002/cre2.647
Machado V, Botelho J, Mascarenhas P, Mendes JJ, Delgado A. A systematic review and meta-analysis on Bolton's ratios: normal occlusion and malocclusion. J Orthod. 2020;47(1):7-29. https://doi.org/10.1016/j.sdentj.2023.03.006
Zhang G, Feng Q, Wei X, Xing K, Mei H, Zhou J, et al. A simple method for quick evaluation of the anterior tooth ratio: an observational study. BMC Oral Health. 2022;22(1):495. https://doi.org/10.1186/s12903-022-02517-3
Anitha AM, Manohar MR. Tooth size discrepancy in prospective orthodontic patients. World J Orthod. 2023 Dec;14(12):1071. https://doi.org/10.5005/jp-journals-10015-2351
Hussein FA, Mohamed RE, El-Awady AA, Ali MM, Al-Khalifa HN, Abdallah KFet al. Digital evaluation of Bolton's tooth size discrepancies among different malocclusions categories of Egyptian adolescent orthodontic population: a retrospective study. Int Orthod. 2022 Sep 1;20(3):100660. https://doi.org/10.1016/j.ortho.2022.100660
Alam MK, Hassan R, Mahmood Z, Haq ME. Determination and comparison of tooth size and tooth size ration in normal occlusion and different malocclusion groups. Int Med J. 2013;20(4):462-5. https://doi.org/10.1016/j.ortho.2019.01.005
Elyes H, Ines D, Nada S, Samir T, Ben Amor A. Association between Tooth Size Discrepancies and Angle Malocclusions in a Tunisian Sample. Sch J Dent Sci. 2021;1:52-7. https://doi.org/10.36347/sjds.2021.v08i01.008
Ahmadi M, Chehrazi M, Ghorbanipour R. Evaluation of the discrepancy of the bolton ratio in three groups of sagittal skeletal relationships. Caspian J Dent Res. 2023 Mar 31;12(1):42-9.
Kanchan T, Chugh V, Chugh A, Setia P, Shedge R, Krishan K. Estimation of sex from dental arch dimensions: An Odontometric analysis. J Craniofac Surg. 2021 Nov 1;32(8):2713-5. https://doi.org/10.1097/SCS.0000000000007787
Aldrees AM, Al-Shujaa AM, Alqahtani MA, Aljhani AS. Is arch form influenced by sagittal molar relationship or Bolton tooth-size discrepancy? BMC Oral Health. 2015;15:1-7. https://doi.org/10.1186/s12903-015-0062-2
Alshahrani AA, Alshahrani I, Addas MK, Shaik S, Binhomran FM, AlQahtani J. The tooth size discrepancy among orthodontic patients and normal occlusion individuals from Saudi Arabia: A three-dimensional scan analysis of diagnostic casts. Contemp Clin Dent. 2020;11(2):141-9. https://doi.org/10.4103/ccd.ccd_455_19
Omar H, Alhajrasi M, Felemban N, Hassan A. Dental arch dimensions, form and tooth size ratio among a Saudi sample. Saudi Med J. 2018;39(1):86. https://doi.org/10.15537/smj.2018.1.21035
Carreiro LS, Santos-Pinto A, Raveli DB, Martins LP. Bolton tooth size discrepancy in normal occlusion and in different types of malocclusions and its relationship to arch form and tooth positioning. Revista Dent Press Ortodo Ortop Fac. 2005;10:97- 117.15. Abuhassan SM, Asiry MA. Intermaxillary tooth-size ratios in Saudis: A systematic review. J Int Oral Health. 2021;13(6):533-8. https://doi.org/10.1016/j.sdentj.2023.03.006
Mollabashi V, Soltani MK, Moslemian N, Akhlaghian M, Akbarzadeh M, Samavat H, et al. Comparison of Bolton ratio in normal occlusion and different malocclusion groups in Iranian population. Int Orthod. 2019;17(1):143-50. https://doi.org/10.1016/j.ortho.2019.01.005
Tayyab M, Zakir S, Hussain U, Jehan R, Nasrullah Z. Bolton discrepancies among different classes of malocclusion in peshawar population. Pak Oral Dent J. 2014;34(4):647-50.
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