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01.12.2015 | Research article | Ausgabe 1/2015 Open Access

BMC Oral Health 1/2015

Is arch form influenced by sagittal molar relationship or Bolton tooth-size discrepancy?

BMC Oral Health > Ausgabe 1/2015
Abdullah M. Aldrees, Abdulmajeed M. Al-Shujaa, Mohammad A. Alqahtani, Ali S. Aljhani
Wichtige Hinweise

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

AA participated in the design of the study, performed the statistical analysis, and drafted the manuscript. AMA and MAA collected the data. ASA designed the study and helped draft the manuscript. All authors read and approved the final manuscript.



Orthodontic patients show high prevalence of tooth-size discrepancy. This study investigates the possible association between arch form, clinically significant tooth-size discrepancy, and sagittal molar relationship.


Pretreatment orthodontic casts of 230 Saudi patients were classified into one of three arch form types (tapered, ovoid, and square) using digitally scanned images of the mandibular arches. Bolton ratio was calculated, sagittal molar relationship was defined according to Angle classification, and correlations were analyzed using ANOVA, chi-square, and t-tests.


No single arch form was significantly more common than the others. Furthermore, no association was observed between the presence of significant Bolton discrepancy and the sagittal molar relationship or arch form. Overall Bolton discrepancy is significantly more prevalent in males.


Arch form in a Saudi patient group is independent of gender, sagittal molar relationship, and Bolton discrepancy.
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