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Objective: To assess the orthodontic burden of care of patients from a Brazilian rehabilitation center (Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo [HRAC-USP]). Design: Retrospective. Setting: Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo. Interventions: One hundred files of unilateral complete cleft lip and palate patients who had consecutively finished orthodontic rehabilitation at HRAC-USP were evaluated from January 2011 to January 2013. The duration of orthodontic treatment, number of visits, kilometers traveled, number of appliances and surgical procedures performed were recorded. The sample was divided into 2 subgroups according to severity the interarch relation (Goslon Yardstick score) at the beginning of orthodontic treatment. Mann- Whitney test was applied for intergroup comparison (P < .05). Results: For the total sample (n= 100), the mean time of orthodontic treatment was 140.2 months, the mean number of orthodontic appointments was 61.8, the mean number of appliances was 10, the mean number of surgical procedures was 6.2, and the mean distance traveled to attend the center for orthodontic appointments was 38,978.5 km. The subgroup with the most severe malocclusion (Goslon yardsticks scores 4 and 5) showed a longer orthodontic treatment length, greater number of surgical procedures, and longer distance traveled than those presenting Goslon yardstick scores 1, 2, and 3. Conclusion: Patients with greater severity of the initial malocclusion experienced a higher burden of care than patients with less severity of the initial malocclusion. To reduce the burden of care, research and efforts should focus on minimizing maxillary growth deficiency related to primary surgery. [ABSTRACT FROM AUTHOR]

Copyright of Revista Clínica de Ortodontia Dental Press is the property of Dental Press International and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: To verify the relationship between maxillary and mandibular effective lengths and dental crowding in patients with Class II malocclusions. Materials and Methods: The sample comprised 80 orthodontic patients with complete Class II malocclusions in the permanent dentition (47 male, 33 female) who were divided into two groups according to the amount of mandibular tooth-arch size discrepancy. The maxillary and mandibular effective lengths (Co-A and Co-Gn) and tooth-arch size discrepancies were measured on the initial cephalograms and dental casts, respectively. Intergroup comparisons of apical base lengths were performed with independent t-tests. Correlation between base length and dental crowding was examined by means of Pearson's correlation coefficient (P < .05). Results: Patients with Class II malocclusion and moderate to severe crowding had significantly smaller maxillary and mandibular effective lengths than subjects with the same malocclusion and slight mandibular crowding. A weak inverse correlation was also found between maxillary and mandibular effective lengths and the severity of dental crowding. Conclusion: Decreased maxillary and mandibular effective lengths constitute an important factor associated with dental crowding in patients with complete Class II malocclusion. [ABSTRACT FROM AUTHOR]

Introduction: A smaller voxel dimension leads to greater resolution of Cone-Beam Computed Tomography (CBCT), but a greater dosage of radiation is emitted. Objective: Assess and compare the reproducibility of buccal and lingual bone plate thickness measurements in CBCT images using different image acquisition protocols, with variations in the voxel dimension. Methods: CBCT exams were taken of U dried human mandibles with voxel dimensions of 0.2, 0.3 and 0.4 mm using the i-CAT Cone-Beam 3-D Dental Imaging System. The thickness of the buccal and lingual bone plates was measured, with the i-CAT Vision software, on an axial section passing ~ 2 mm above the right mental foramen. Intra-examiner and inter-examiner reproducibility was assessed using the paired t-test and independent t-test, respectively, with the level of significance set at 5%. Results: Excellent inter-examiner reproducibility was observed for the three protocols analyzed. Intra-examiner reproducibility was very good, with the exception of some regions of the anterior teeth, which exhibited statistically significant differences regardless of the voxel dimensions. Conclusion: The measurement of buccal and lingual bone plate thickness on CBCT images demonstrated good precision for voxel dimensions of 0.2, 0.3 and 0.4 mm. The reproducibility of the measurements of the anterior region of the mandible was more critical than that of the posterior region. [ABSTRACT FROM AUTHOR]

Copyright of Revista Clínica de Ortodontia Dental Press is the property of Dental Press International and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Clínica de Ortodontia Dental Press is the property of Dental Press International and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista Clínica de Ortodontia Dental Press is the property of Dental Press International and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

This study evaluated rapid maxillary expansion (RME) dentoskeletal effects by means of computed tomography (CT), comparing tooth tissue-borne and tooth-borne expanders. The sample comprised eight girls aged 11 to 14 years presenting Class I or II malocclusions with posterior unilateral or bilateral crossbite that were randomly divided into two treatment groups, palatal acrylic (Haas-type) and hygienic (Hyrax) expanders. All appliances were activated up to the full seven mm capacity of the expansion screw. The patients were subjected to a spiral CT scan before expansion and after a three-month retention period when the expander was removed. One-millimeter-thick axial sections were scanned parallel to the palatal plane, comprising the dentoalveelar area and the base of the maxilla up to the inferior third of the nasal cavity. Multiplanar reconstruction was used to measure maxillary transverse dimensions and posterior teeth inclination by means of a computerized method. The results showed that RME produced a significant increase in all measured transverse linear dimensions, decreasing in magnitude from dental arch to basal bone. The transverse increase at the level of the nasal floor corresponded to one-third of the amount of screw activation. Tooth-borne (Hyrax) and tooth tissue-borne (Haas-type) expanders tended to produce similar orthopedic effects. In both methods, RME led to buccal movement of the maxillary posterior teeth, by tipping and bodily translation. The second premolars displayed more buccal tipping than the appliance-supporting teeth. The tooth tissue-borne expander produced a greater change in the axial inclination of appliance-supporting teeth, especially first premolars, compared with the tooth-borne expander. [ABSTRACT FROM AUTHOR]

Objective: To assess the orthodontic burden of care of patients from a Brazilian rehabilitation center (Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo [HRAC-USP])., Design: Retrospective., Setting: Hospital for Rehabilitation of Craniofacial Anomalies, University of São Paulo., Interventions: One hundred files of unilateral complete cleft lip and palate patients who had consecutively finished orthodontic rehabilitation at HRAC-USP were evaluated from January 2011 to January 2013. The duration of orthodontic treatment, number of visits, kilometers traveled, number of appliances and surgical procedures performed were recorded. The sample was divided into 2 subgroups according to severity the interarch relation (Goslon Yardstick score) at the beginning of orthodontic treatment. Mann-Whitney test was applied for intergroup comparison ( P < .05)., Results: For the total sample (n = 100), the mean time of orthodontic treatment was 140.2 months, the mean number of orthodontic appointments was 61.8, the mean number of appliances was 10, the mean number of surgical procedures was 6.2, and the mean distance traveled to attend the center for orthodontic appointments was 38,978.5 km. The subgroup with the most severe malocclusion (Goslon yardsticks scores 4 and 5) showed a longer orthodontic treatment length, greater number of surgical procedures, and longer distance traveled than those presenting Goslon yardstick scores 1, 2, and 3., Conclusion: Patients with greater severity of the initial malocclusion experienced a higher burden of care than patients with less severity of the initial malocclusion. To reduce the burden of care, research and efforts should focus on minimizing maxillary growth deficiency related to primary surgery.