OBJECTIVE: To evaluate the immediate effects of rapid maxillary expansion (RME) on the transverse skeletal and dentoalveolar changes with bone-borne (C-expander) and tooth-borne type expanders using cone-beam computed tomography (CBCT) in late adolescents. MATERIALS AND METHODS: A sample of 28 female late-adolescent patients was divided into two groups according to the type of expander: bone-borne (C-expander, n = 15, age = 18.1 ± 4.4 years) and tooth-borne (hyrax, bands on premolars and molars, n = 13, age = 17.4 ± 3.4 years). CBCT scans were taken at 0.2-mm voxel size before treatment (T1) and 3 months after RME (T2). Transverse skeletal and dental expansion, alveolar inclination, tooth axis, vertical height of tooth, and buccal dehiscence were evaluated on maxillary premolars and molars. Paired t-test, independent t-test, one-way analysis of variance, and Scheffé post hoc analysis were performed. RESULTS: The C-expander group produced greater skeletal expansion, except in the region of the first premolar (P < .05 or < .01), which showed slight buccal tipping of the alveolar bone. The Hyrax group had more buccal tipping of the alveolar bone and the tooth axes, except in the region of the second molar (P < .05 or < .01 or < .001). Dental expansion at the apex level was similar in the banded teeth (the first premolar and the first molar). Vertical height changes were apparent on the second premolar in the hyrax group (P < .05 or < .01). Significant buccal dehiscence occurred at the first premolar in the hyrax group (P < .01 or < .001). There were no significant differences between tooth types for any variables in the C-expander group. CONCLUSIONS: For patients in late adolescence, bone-borne expanders produced greater orthopedic effects and fewer dentoalveolar side effects compared to the hyrax expanders.
OBJECTIVE: To evaluate the immediate effects of rapid maxillary expansion (RME) on the transverse skeletal and dentoalveolar changes with bone-borne (C-expander) and tooth-borne type expanders using cone-beam computed tomography (CBCT) in late adolescents. MATERIALS AND METHODS: A sample of 28 female late-adolescent patients was divided into two groups according to the type of expander: bone-borne (C-expander, n = 15, age = 18.1 ± 4.4 years) and tooth-borne (hyrax, bands on premolars and molars, n = 13, age = 17.4 ± 3.4 years). CBCT scans were taken at 0.2-mm voxel size before treatment (T1) and 3 months after RME (T2). Transverse skeletal and dental expansion, alveolar inclination, tooth axis, vertical height of tooth, and buccal dehiscence were evaluated on maxillary premolars and molars. Paired t-test, independent t-test, one-way analysis of variance, and Scheffé post hoc analysis were performed. RESULTS: The C-expander group produced greater skeletal expansion, except in the region of the first premolar (P < .05 or < .01), which showed slight buccal tipping of the alveolar bone. The Hyrax group had more buccal tipping of the alveolar bone and the tooth axes, except in the region of the second molar (P < .05 or < .01 or < .001). Dental expansion at the apex level was similar in the banded teeth (the first premolar and the first molar). Vertical height changes were apparent on the second premolar in the hyrax group (P < .05 or < .01). Significant buccal dehiscence occurred at the first premolar in the hyrax group (P < .01 or < .001). There were no significant differences between tooth types for any variables in the C-expander group. CONCLUSIONS: For patients in late adolescence, bone-borne expanders produced greater orthopedic effects and fewer dentoalveolar side effects compared to the hyrax expanders.
Authors: Jan Hourfar; Gero Stefan Michael Kinzinger; Björn Ludwig; Julia Spindler; Jörg Alexander Lisson Journal: J Orofac Orthop Date: 2016-06-07 Impact factor: 1.938
Authors: Daniela Garib; Felicia Miranda; Juan Martin Palomo; Fernando Pugliese; José Carlos da Cunha Bastos; Alexandre Magno Dos Santos; Guilherme Janson Journal: Angle Orthod Date: 2021-03-01 Impact factor: 2.079