American Journal of Orthodontics and Dentofacial Orthopedics
Original articleComparison of maxillary basal arch forms using the root apex in adult women with different skeletal patterns: A pilot study
Section snippets
Material and methods
This retrospective study was designed as a pilot project to propose a new method to depict maxillary basal arch forms. In this study, we evaluated randomly selected Korean adult women who visited the Pusan National University Dental Hospital from January 2012 to May 2018 and underwent CBCT (Pax-Zenith3D; VATECH Co, Ltd, Seoul, South Korea), which was performed in centric relation for other reasons. Only female subjects were included as there was a noticeable difference in arch width between men
Results
The basal arch forms for each group are shown in Figure 3. Each group's distribution resulted in the following polynomial function:
- (1)
Class I group: y = 0.4073 + 0.018x2 + 2.9357 × 10−5x4
- (2)
Class II Division 1 group: y = 0.1342 + 0.037x2 + 2.9918 × 10−5x4
- (3)
Class II Division 2 group: y = 0.7625 + 3.405 × 10−3x2 + 1.099 × 10−5x4 + 9.454 × 10−8x6
- (4)
Class III group: y = −0.4295 + 0.031x2 + 4.4071 × 10−6x4
The mean shapes of basal arch forms for each group are shown in Figure 4. The standard deviations of x and
Discussion
The sample size with a test power of 0.8 (α = 0.05) and an effect size of 0.25 proposed by Cohen20 was 180 subjects. Because patients with skeletal Class II Division 2 malocclusion were very hard to find, we decided to design this study as a pilot test to propose a new method to depict maxillary basal arch forms.
Selecting a proper wire that fits pretreatment arch forms during orthodontic treatment is essential to obtain good results and retention. In the case of patients with transverse
Conclusions
We established the maxillary basal arch forms using the root apices in adult women with different sagittal skeletal patterns. There are significant differences in the intercanine width (P <0.05). The intercanine width of the Class II Division 1 group was narrower than those of other groups. The use of the root apex to depict the basal arch form seems reasonable.
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Cited by (1)
Maxillary basal arch forms in operated adult patients with cleft lip and palate using root apices: A pilot study
2023, Orthodontics and Craniofacial Research
All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest, and none were reported.
This work was supported by a 2-year research grant from Pusan National University.