A New Perspective on the Relationship Between Anchorage and Palatal Morphology: Three‑Dimensional Digital Model Analysis

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Metin Gürsoy G., Tortop T.

NIGERIAN JOURNAL OF CLINICAL PRACTICE, vol.25, no.10, pp.1066-1073, 2022 (SCI-Expanded)


Background: The tooth movements were generally analyzed in two dimensions

on cephalometric radiographs. Nowaday, 3D digital model analysis, which does

not have any harmful effects on patients, can be used to evaluate the palatal

morphology and coronal tooth movements in a very comfortable and easy way.

Aims: To investigate the effect of palatal morphology on anchorage reinforcement

during intraoral molar distalization with pendulum appliance using 3D model

analysis. Materials and Methods: The material consisted of before (T0) and

after (T1) dental plaster models of Class II malocclusion patients (17 females,

3 males) treated with pendulum appliance for molar distalization and Nance

appliance for anchorage. T0 and T1 digital models were superimposed using the

palatal area as a reference via three points and surface‑matching software, and

the changes in teeth movement were calculated for left and right central incisors,

first premolars, and first and second molars. Palatal morphology was evaluated

at T0 on digital models as palatal inclination, palatal depth angles, and anterior

hard palate area. Wilcoxon test was used to evaluate the treatment results and

Spearman’s correlation analysis was performed to evaluate the relationship

between palatal morphology and dental movement. The upper limit for the level

of significance was taken as 0.05. Results: Mesial movement of first premolars

and distal movement of first and second molars were found to be statistically

significant (P < 0.001). A weak negative correlation was found between the

palatal inclination and the movement of first premolars (P < 0.045 and P < 0.003).

Palatal depth angles and anterior hard palate area had no correlation with dental

movements. Conclusion: Presented results supported that the mesial movement of

premolar teeth decreased as the inclination of the palate increased.