The purpose of the present study was to evaluate: (i) maxillary occlusal plane changes after clear aligners therapy with a 3D measurement technique; and (ii) as a secondary outcome, if such changes were correlated to the patient's 1axilla-mandibular divergence. 3D maxillary models of 32 patients (7 males and 25 females; mean age 22.3 +/- 3.4 year) treated with clear aligners were analyzed. The angle (alpha) between a reference palatine plane and a maxillary occlusal plane was measured. Five angular cephalometric measurements (NSL/MP; PP-OP; OP-MP; PP-MP; PFH/AFH%) were performed and related to Delta alpha. The subjects were further divided into three groups according to facial divergence. After aligner treatment, Delta alpha increased in hyperdivergent patients and decreased in hypodivergent patients (p < 0.05). Delta alpha showed a significant positive correlation with NSL/MP (rho = 0.44) and negative correlation with PFH/AFH% (rho = -0.53). Aligners treatment produced a counterlockwise rotation of the maxillary occlusal plane, even if this rotation occurs differently depending on divergence.
Occlusal Plane Modification in Clear Aligners Treatment: Three Dimensional Retrospective Longitudinal Study
Ciavarella, D;Campobasso, A;Laurenziello, M;Illuzzi, G;
2023-01-01
Abstract
The purpose of the present study was to evaluate: (i) maxillary occlusal plane changes after clear aligners therapy with a 3D measurement technique; and (ii) as a secondary outcome, if such changes were correlated to the patient's 1axilla-mandibular divergence. 3D maxillary models of 32 patients (7 males and 25 females; mean age 22.3 +/- 3.4 year) treated with clear aligners were analyzed. The angle (alpha) between a reference palatine plane and a maxillary occlusal plane was measured. Five angular cephalometric measurements (NSL/MP; PP-OP; OP-MP; PP-MP; PFH/AFH%) were performed and related to Delta alpha. The subjects were further divided into three groups according to facial divergence. After aligner treatment, Delta alpha increased in hyperdivergent patients and decreased in hypodivergent patients (p < 0.05). Delta alpha showed a significant positive correlation with NSL/MP (rho = 0.44) and negative correlation with PFH/AFH% (rho = -0.53). Aligners treatment produced a counterlockwise rotation of the maxillary occlusal plane, even if this rotation occurs differently depending on divergence.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
