American Journal of Orthodontics and Dentofacial Orthopedics
Original articleTreatment outcomes after extraction and nonextraction treatment evaluated with the American Board of Orthodontics objective grading system
Section snippets
Material and methods
In this retrospective study, the parent sample consisted of the records of 542 patients gathered from 5 private orthodontic practices and from the University of Athens graduate orthodontic clinic in Greece. The inclusion criteria for the parent sample were white male or female patients with a Class I dental and skeletal malocclusion, a full complement of teeth excluding the third molars, no previous orthodontic treatment, no clefts or dentofacial deformities, and no orthognathic surgery
Results
The results of descriptive and inferential statistics calculated for the ABO-OGS variables are shown in Table IV. The total scores for the extraction group ranged from 11 to 41, with a mean value of 27.04; the scores for the nonextraction group ranged from 16 to 44, with a mean value of 29.07. No statistically significant difference was observed in the total ABO-OGS scores between patients treated with or without extractions (mean difference, 2.03; 95% confidence interval (CI), −1.60, 5.65; P
Discussion
Often in the literature, comparisons of 2 treatment modalities are contaminated with “susceptibility bias,” which is defined as a between-groups or among-groups difference in prognostic expectations for the treatment outcome. The innovative aspect of our study was the objective way of defining a bias-free borderline sample via discriminant analysis. To achieve an accurate representation of all patients' attributes, 34 variables were used in the discriminant analysis. Then a borderline sample
Conclusions
The results of this investigation showed no statistically significant differences in the total ABO-OGS scores between Class I patients treated with and those treated without extraction of the 4 first premolars. Although the extraction group, in general, achieved better scores, no statistically significant differences were found between scores of the 8 ABO-OGS variables. The variable of buccolingual inclination, through which torque control of the posterior segments is assessed, received the
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Cited by (18)
Palatal shape covariation in extraction versus nonextraction borderline patients: A geometric morphometric study
2023, American Journal of Orthodontics and Dentofacial OrthopedicsDental, skeletal, and soft-tissue changes in adult orthodontic patients treated with premolar extraction and nonextraction: A cross-sectional study
2022, American Journal of Orthodontics and Dentofacial OrthopedicsCitation Excerpt :These findings are in concurrence with the literature.16 Anthopoulou et al,17 when comparing borderline patients treated by PME and NE, found that while PME scored less for ABO-OGS, the difference was statistically insignificant for the total score and all the components. A contrast in these findings can be explained because of the selection of patients.
Stability of first and second premolars extraction space closure
2022, American Journal of Orthodontics and Dentofacial OrthopedicsCitation Excerpt :Results were considered significant at P <0.05. The random errors were within acceptable limits,27,36 and there were no statistically significant systematic errors (Table I). The groups were comparable regarding initial, final, and follow-up ages, initial and final occlusal statuses, treatment and posttreatment times, maxillary and mandibular crowding, occlusal quality at the finishing and follow-up stages, sex, and malocclusion types distribution (Table II).
Accuracy of dental arch form in customized fixed labial orthodontic appliances
2022, American Journal of Orthodontics and Dentofacial OrthopedicsLong-term occlusal changes and patient satisfaction in patients treated with and without extractions: 37 years after treatment
2020, American Journal of Orthodontics and Dentofacial OrthopedicsCitation Excerpt :The buccolingual inclination is related to torque control in posterior segments. Some studies show high scores for these criteria, illustrating the tendency for deficiency in placing adequate torque in the buccal segments.30,38 Furthermore, some authors6,51 also found that buccolingual inclination tends to deteriorate over time with the natural aging process.
Long term stability of treatment outcome after fixed orthodontic treatment with or without premolar extraction
2019, Orthodontic WavesCitation Excerpt :These findings indicated that occlusion remained stable over a period of two years after the post-treatment and there was no difference between the extraction and non-extraction treatment plan. The findings are in agreement with the study of Anthopoulou et al. [29] and Akinci Cansunar and Uysal [30] who also reported that an acceptable occlusion could be achieved at the post-treatment in the patients treated with either of the treatment philosophy i.e. extraction or non-extraction whereas Farhadian et al. [28] found that the patients who had undergone extraction of four premolars had more acceptable final occlusion. There was significant relapse in crowding of maxillary and mandibular anterior teeth in both extraction and non-extraction groups.
All authors have completed and submitted the ICMJE Form for Disclosure of Potential Conflicts of Interest, and none were reported.