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1.
Sci Rep ; 9(1): 19309, 2019 12 17.
Artículo en Inglés | MEDLINE | ID: mdl-31848435

RESUMEN

The aim of this study was to evaluate the differences in sella dimensions and shape between growing patients with Class I, Class II, and Class III skeletal malocclusions, evaluated through morphometric analysis. Seventy-eight subjects aged between 9 and 13 years were selected and assigned to either the Class I, Class II, or Class III groups according to the measured ANB angle (the angle between the Nasion, skeletal A-point and skeletal B-point). Six landmarks were digitised to outline the shape of the sella turcica. Linear measurements of the sella length and depth were also performed. Procrustes superimposition, principal component analysis, and canonical variate analysis were used to evaluate the differences in sella shape between the three groups. A one-way MANOVA and Tukey's or Games-Howell tests were used to evaluate the presence of differences in sella dimensions between the three groups, gender, and age. The canonical variate analysis revealed a statistically significant difference in sella shape between the Class I and the Class II groups, mostly explained by the CV1 axis and related to the posterior clinoidal process and the floor of the sella. No differences were found regarding linear measurements, except between subjects with different age. These differences in sella shape, that are present in the earlier developmental stages, could be used as a predictor of facial growth, but further studies are needed.


Asunto(s)
Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase I/diagnóstico por imagen , Silla Turca/diagnóstico por imagen , Adolescente , Factores de Edad , Pesos y Medidas Corporales/métodos , Cefalometría/métodos , Niño , Femenino , Humanos , Masculino , Maloclusión de Angle Clase I/fisiopatología , Maloclusión de Angle Clase II/fisiopatología , Maloclusión de Angle Clase III/fisiopatología , Análisis de Componente Principal , Silla Turca/fisiopatología
2.
Int Orthod ; 17(4): 817-825, 2019 12.
Artículo en Inglés | MEDLINE | ID: mdl-31481304

RESUMEN

This case report shows the orthodontic treatment of four first premolar extractions of a 14-year-old teenager presenting a dental Class I malocclusion with a severe retrognathic mandible. It reflects conflicting views on objectives between the orthodontist who takes into account the facial balance and the patient who only desires a tooth alignment.


Asunto(s)
Diente Premolar/cirugía , Maloclusión de Angle Clase II/terapia , Maloclusión de Angle Clase I/terapia , Extracción Dental , Técnicas de Movimiento Dental/métodos , Adolescente , Puntos Anatómicos de Referencia , Cefalometría , Modelos Dentales , Mentoplastia , Humanos , Masculino , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Aparatos Ortodóncicos Fijos , Alambres para Ortodoncia , Osteotomía , Técnicas de Movimiento Dental/instrumentación , Resultado del Tratamiento
3.
Am J Orthod Dentofacial Orthop ; 156(1): 113-124, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-31256824

RESUMEN

Scissor bite often remains unnoticed by patients although it can adversely affect facial symmetry, jaw growth, and mastication. This case report illustrates the efficacy of temporary skeletal anchorage devices (TSADs) and a modified lingual arch in correcting severe scissor bite. A 28-year-old woman presented with severe scissor bite in the mandibular right posterior segment. To treat this condition, TSADs were used for maxillary posterior intrusion and a modified lingual arch for buccally uprighting mandibular posterior teeth. Long-term retention records demonstrate stable treatment results.


Asunto(s)
Oclusión Dental , Maloclusión de Angle Clase II/terapia , Maloclusión de Angle Clase I/terapia , Ortodoncia Correctiva/métodos , Adulto , Cefalometría/métodos , Modelos Dentales , Femenino , Humanos , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase I/cirugía , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/cirugía , Mandíbula/diagnóstico por imagen , Mandíbula/patología , Mandíbula/cirugía , Maxilar/diagnóstico por imagen , Maxilar/patología , Maxilar/cirugía , Métodos de Anclaje en Ortodoncia/instrumentación , Métodos de Anclaje en Ortodoncia/métodos , Diseño de Aparato Ortodóncico , Aparatos Ortodóncicos , Alambres para Ortodoncia , Ortodoncia Correctiva/instrumentación , Técnica de Expansión Palatina , Planificación de Atención al Paciente , Factores de Tiempo , Resultado del Tratamiento
4.
J Craniofac Surg ; 30(8): e727-e733, 2019.
Artículo en Inglés | MEDLINE | ID: mdl-31306374

RESUMEN

BACKGROUND: Corticotomy-assisted rapid orthodontics is a widely used method for speeding up conventional orthodontics. This study (i) evaluates the effects of corticotomy alone, corticotomy combined with bone graft, and corticotomy with platelet-rich fibrin (PRF) on vestibular alveolar bone thickness in patients with class I malocclusion; (ii) compares the treatment time with a conventional orthodontic therapy group, and (iii) investigates the periodontal health of patients who have undergone corticotomy-assisted rapid orthodontics. METHODS: The patients were divided into 3 groups: Group 1 (n = 10) underwent corticotomy alone; Group 2 (n = 10) underwent corticotomy combined with bone graft, and Group 3 (n = 10) underwent corticotomy combined with PRF. In the following stage, vestibular alveolar bone thicknesses were evaluated using 3-dimensional cone-beam computed tomography images. RESULTS: The findings showed that Group 2 achieved a more significant augmentation of the vestibular alveolar bone than Groups 1 and 3 (P = 0.001, P = 0.003), while corticotomy-assisted rapid orthodontics decreased treatment times. Sufficient alveolar bone thickness and preservation of the periodontal health were achieved when the corticotomy procedure was either combined with a bone graft or with PRF in the Class-I malocclusion patients. CONCLUSION: Bone grafts provided better bone thickness at the buccal surface of the anterior teeth of the mandible and maxilla, whereas the thickness of the keratinized gingiva was better with PRF.


Asunto(s)
Maloclusión de Angle Clase I/diagnóstico por imagen , Adolescente , Trasplante Óseo/métodos , Tomografía Computarizada de Haz Cónico/métodos , Femenino , Humanos , Masculino , Ortodoncia , Factores de Tiempo
5.
Int Orthod ; 17(3): 478-487, 2019 09.
Artículo en Inglés | MEDLINE | ID: mdl-31231000

RESUMEN

INTRODUCTION: The mouth plays an important role in the overall aesthetic appearance of the face. The aims of this study were to determine the optimal antero-posterior (AP) lip position relative to various rotations of the nasal tip and assess the impact of the nasolabial angle on facial aesthetics. MATERIAL AND METHODS: Three-dimensional facial volumes, in motion, of one Caucasian male and one Caucasian female with a Class I malocclusion and an orthognathic profile were modified to alter the nasal tip rotation (3 rotations) and the AP lips position (6 positions). 72 generated models were created in two and three-dimensions. Generated models were rated online by 60 dentists, 60 orthodontists and 60 laypeople, using a Visual Analogue Scale. Scores were analysed according to lip position, rater's profession and gender. RESULTS: General agreement was found between all groups on the most and least preferred lip positions. No differences between male and female raters were found. All raters were more influenced by the 3-dimensional rotating facial volume than by 2-dimensional angles. Similar angular values for the nasolabial angles were found in the most and least preferred profiles, showing that the most influential factor in facial aesthetics was the lip position, and stressing the need to evaluate each component of the nasolabial angle independently. CONCLUSION: The lip position was the determinant factor in facial aesthetics with little influence of the nose tip rotation. Three-dimensional evaluation of the nose and lip were needed to establish a soft tissue-based treatment plan.


Asunto(s)
Cara/anatomía & histología , Labio/anatomía & histología , Maloclusión de Angle Clase I/diagnóstico por imagen , Nariz/anatomía & histología , Adulto , Mentón/anatomía & histología , Estética Dental , Cara/diagnóstico por imagen , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador/métodos , Imagenología Tridimensional/métodos , Labio/diagnóstico por imagen , Masculino , Maloclusión de Angle Clase I/terapia , Nariz/diagnóstico por imagen , Fotograbar , Factores Sexuales , Encuestas y Cuestionarios , Escala Visual Analógica
6.
Int Orthod ; 17(2): 296-303, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-31010730

RESUMEN

The purpose of this study was to locate the landmarks both in traditionally-used two-dimensional (2D) lateral cephalogram images and newly suggested landmarks in three-dimensional (3D) cone-beam computer tomography (CBCT) images to determine possible relationships between them and determine if they could be used to classify patients of malocclusion Class I. MATERIAL AND METHODS: CBCT images from 30 patients with malocclusion Class I were selected from the university of Alberta Graduate Orthodontic Program database. The images were then reconstructed using the AVIZO® software platform to visualize and locate landmarks. There were a total of forty-two landmarks chosen for analysis, which included pre-existing landmarks used in 2D imaging as well as new landmarks suggested for 3D analysis. Descriptive statistics were also assessed using SPSS statistical package to determine any skeletal and dental relationships. RESULTS: Descriptive statistics show that the linear and angular measurements used in 2D images did not correlate well with measurements in CBCT. The lowest standard deviation obtained was 0.04 for S-GoL/N-Me with a mean of 0.70mm. The highest standard deviation was 17.46 for FH-MPL with a mean of 41.53mm. CONCLUSION: The traditional landmarks used for 2D analysis of malocclusion did not show specific skeletal or dental patterns for analysing and classifying 3D images as malocclusion Class I.


Asunto(s)
Tomografía Computarizada de Haz Cónico/métodos , Imagenología Tridimensional/métodos , Maloclusión de Angle Clase I/diagnóstico por imagen , Puntos Anatómicos de Referencia , Cefalometría/métodos , Humanos , Reproducibilidad de los Resultados , Programas Informáticos
7.
Int Orthod ; 17(1): 170-180, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30772353

RESUMEN

Date of birth: 4/02/97; gender: female. PRE-TREATMENT DOCUMENTS: 13.7 years old; 09/2010. DIAGNOSIS: Angle's class: class II subdivision. Missing teeth before treatment: none. TREATMENT PLANNING: Extractions of four first premolars 14, 24, 34, 44. Class II molar and discrepancy correction. Intercuspidation, finishing. Bimaxillary multi-bracket. Beginning of treatment: 12 years old; 10/2010. POST-TREATMENT DOCUMENTS: 15.6 years old; 8/2012. Treatment duration: 17 months. POST-RETENTION DOCUMENTS (MINIMUM 1 YEAR): 06/2016; 19.4 years old. Retention period: unlimited. Maxilla: bonded wire from 12 to 22, vacuum-formed retainer (night-only). Mandible: bonded wire from 33 to 43, vacuum-formed retainer (night-only).


Asunto(s)
Maloclusión de Angle Clase II/terapia , Maloclusión de Angle Clase I/terapia , Ortodoncia Correctiva/métodos , Adolescente , Puntos Anatómicos de Referencia , Diente Premolar , Niño , Modelos Dentales , Femenino , Humanos , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Mandíbula , Soportes Ortodóncicos , Alambres para Ortodoncia , Planificación de Atención al Paciente , Adulto Joven
8.
Int Orthod ; 17(1): 181-191, 2019 03.
Artículo en Inglés | MEDLINE | ID: mdl-30777735

RESUMEN

Date of birth: 17/11/1998; gender: female. A. PRE-TREATMENT DOCUMENTS: 11 years old; 02/2010. DIAGNOSIS: Angle's class: class II division 2. Missing teeth before treatment: none. TREATMENT PLANNING: Without extractions. Alignment, levelling and arch coordination with intermaxillary class II alastics. Intercuspidation, finishing. Damon's bimaxillary multi-bracket. Beginning of treatment: 12 years old; 10/2010. B. POST-TREATMENT DOCUMENTS: 14 years old; 11/2012. Treatment duration: 25 months. C. POST-RETENTION DOCUMENTS (MINIMUM 1 YEAR): 09/2016; 18 years old. Retention period: unlimited. Maxilla: vacuum-formed retainer (night-only). Mandible: bonded wire from 33 to 43.


Asunto(s)
Maloclusión de Angle Clase II/terapia , Maloclusión de Angle Clase I/terapia , Ortodoncia Correctiva/métodos , Adolescente , Cefalometría , Niño , Modelos Dentales , Femenino , Humanos , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Mandíbula/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Soportes Ortodóncicos , Retenedores Ortodóncicos , Alambres para Ortodoncia , Planificación de Atención al Paciente , Radiografía Panorámica
9.
Oral Radiol ; 35(1): 43-50, 2019 01.
Artículo en Inglés | MEDLINE | ID: mdl-30484184

RESUMEN

OBJECTIVES: This study was performed to compare the positions of the right and left condyles between male and female patients with different Angle malocclusions using cone-beam computed tomography (CBCT) panoramic reconstructions. METHODS: The CBCT images of 60 patients (age of 18-37 years) were retrospectively evaluated. The patients were divided according to their Angle malocclusion classifications (Angle Classes I, II, and III). The condyle-to-eminence, condyle-to-fossa, and condyle-to-meatus distances were measured digitally using i-CAT software. RESULTS: The left and right condyle-to-fossa distances were the most variable parameters among the Angle classes. The right condyle-to-eminence and right condyle-to-fossa distances were significantly different among the classes. Male patients seemed to have a greater condyle-to-fossa distance on the right side in both the Class I and III groups. The mean distance from the condyle to eminence, condyle to fossa, and condyle to meatus on the right side was the greatest in the Angle Class II group. CONCLUSIONS: In all three types of malocclusion (Angle Classes I, II, and III), the condyles on both the right and left sides were not exactly symmetric or centrally located within the glenoid fossa. This work emphasizes the differences in the condyle position between male and female patients. Furthermore, the symmetry and centricity of the condyles are not dependent on the patient's sex or type of malocclusion.


Asunto(s)
Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase I , Adolescente , Adulto , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Masculino , Maloclusión de Angle Clase I/diagnóstico por imagen , Cóndilo Mandibular , Estudios Retrospectivos , Articulación Temporomandibular , Adulto Joven
10.
Orthod Craniofac Res ; 22(1): 9-15, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-30421852

RESUMEN

OBJECTIVES: To clarify the associations among tongue volume, hyoid position, airway volume and maxillofacial form using cone beam computed tomography (CBCT) data for children with Class-I, Class-II and Class-III malocclusion. SETTING AND SAMPLE POPULATION: Sixty children (mean age, 9.2 years) divided into Class-I, Class-II and Class-III malocclusion groups according to the A-nasion-B angle. MATERIAL AND METHODS: Cone beam computed tomography was used for three-dimensional reconstruction of the maxillofacial region and airway. The hyoid position and the tongue, airway and oral cavity volumes were evaluated. Upper airway ventilation status was calculated using computational fluid dynamics. The groups were compared using analysis of variance and Kruskal-Wallis tests; relationships among the parameters were assessed using Pearson's and Spearman's rank correlation tests. RESULTS: The tongue volume was larger in Class-III patients (50.63 cm3 ) than in Class-I patients (44.24 cm3 ; P < 0.05). The hyoid position was lower (49.44 cm), and anatomical balance (AB; tongue volume/oral cavity volume; 85.06%) was greater in Class-II patients than in Class-I patients (46.06 cm, 80.57%, respectively; P < 0.05 for both). The hyoid height showed a positive correlation with AB (r = 0.614; P < 0.001). CONCLUSIONS: Children with Class-III malocclusion have large tongue volumes and small AB; the reverse is true for children with Class-II malocclusion. The hyoid position is closely associated with AB in children with malocclusion.


Asunto(s)
Hueso Hioides/patología , Maloclusión de Angle Clase III/patología , Maloclusión de Angle Clase II/patología , Maloclusión de Angle Clase I/patología , Nasofaringe/patología , Lengua/patología , Niño , Tomografía Computarizada de Haz Cónico , Cara/diagnóstico por imagen , Cara/patología , Femenino , Humanos , Hueso Hioides/diagnóstico por imagen , Imagenología Tridimensional , Masculino , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase III/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Maxilar/patología , Nasofaringe/diagnóstico por imagen , Estudios Retrospectivos , Lengua/diagnóstico por imagen
11.
BMC Oral Health ; 18(1): 109, 2018 06 19.
Artículo en Inglés | MEDLINE | ID: mdl-29921259

RESUMEN

BACKGROUNDS: The occlusal registration of virtual models taken by intraoral scanners sometimes shows patterns which seem much different from the patients' occlusion. Therefore, this study aims to evaluate the accuracy of virtual occlusion by comparing virtual occlusal contact area with actual occlusal contact area using a plaster model in vitro. METHODS: Plaster dental models, 24 sets of Class I models and 20 sets of Class II models, were divided into a Molar, Premolar, and Anterior group. The occlusal contact areas calculated by the Prescale method and the virtual occlusion by scanning method were compared, and the ratio of the molar and incisor area were compared in order to find any particular tendencies. RESULTS: There was no significant difference between the Prescale results and the scanner results in both the molar and premolar groups (p = 0.083 and 0.053, respectively). On the other hand, there was a significant difference between the Prescale and the scanner results in the anterior group with the scanner results presenting overestimation of the occlusal contact points (p < 0.05). In Molars group, the regression analysis shows that the two variables express linear correlation and has a linear equation with a slope of 0.917. R2 is 0.930. Groups of Premolars and Anteriors had a week linear relationship and greater dispersion. CONCLUSIONS: Difference between the actual and virtual occlusion revealed in the anterior portion, where overestimation was observed in the virtual model obtained from the scanning method. Nevertheless, molar and premolar areas showed relatively accurate occlusal contact area in the virtual model.


Asunto(s)
Modelos Dentales , Oclusión Dental , Imagenología Tridimensional , Maloclusión de Angle Clase II/patología , Maloclusión de Angle Clase I/patología , Adulto , Humanos , Técnicas In Vitro , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Interfaz Usuario-Computador
12.
Am J Orthod Dentofacial Orthop ; 154(1): 91-98, 2018 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-29957327

RESUMEN

INTRODUCTION: Our objective was to analyze the characteristics that affect skeletal Class I adults with mandibular asymmetries using cone-beam computerized tomography. METHODS: The sample included cone-beam computerized tomography images of 120 subjects. Asymmetry was determined by the deviation of gnathion from the midsagittal plane and classified as relative symmetry, moderate asymmetry, or severe asymmetry. Maxillary and mandibular measurements were made, and the differences between the contralateral side and the deviated side were evaluated, as well as the differences between the categories of asymmetry. RESULTS: For patients with moderate asymmetry, there were significant differences between the contralateral and deviated sides for some measuments in the transverse and vertical planes. For those with severe asymmetry, statistically significant differences were found between the sides for all measurements, except for the measuments that evaluated the position of the mandibular condyle in the transverse and sagittal directions. Furthermore, a strong correlation was found in patients with severe asymmetry, between the deviation of the mandibular dental midline and the lateral displacement of gnathion. CONCLUSIONS: Patients with relative symmetry had a bilateral balance, whereas those with moderate and severe asymmetries showed several skeletal imbalances. A great deviation of the mandibular dental midline may indicate severe skeletal asymmetry in Class I adults.


Asunto(s)
Cefalometría , Tomografía Computarizada de Haz Cónico , Asimetría Facial/diagnóstico por imagen , Imagenología Tridimensional , Maloclusión de Angle Clase I/diagnóstico por imagen , Mandíbula/anomalías , Mandíbula/diagnóstico por imagen , Adulto , Estudios Transversales , Femenino , Humanos , Masculino , Persona de Mediana Edad , Adulto Joven
13.
J Contemp Dent Pract ; 19(4): 431-437, 2018 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-29728549

RESUMEN

Aim: The aim of this study is (1) to inspect any difference in mandibular arch widths between males and females in class I and class II division 1 (class malocclusions using cone-beam computed tomography (CBCT), (2) to compare the mandibular dental and basal widths between the two groups, and (3) to investigate any possible correlation between dental and basal arch widths in both groups. Materials and methods: The CBCT images of 68 patients aged between 18 and 25 years consisted of 34 class I (17 males and 17 females) and 34 class (17 males and 17 females) who were recruited at the Department of Orthodontics, University of Damascus Dental School (Syria). Using on-demand three-dimensional (3D) on axial views, facial axis points for dental measurements and basal bone center (BBC) points for basal measurements were identified on lower canines and first molars. Dental and basal intercanine width (ICW) and intermolar width (IMW) were measured. Results: Independent t-test showed a statistically significant difference between males and females in several variables in both groups and a statistically significant difference between class I and class groups in the basal ICW for both genders and in the dental ICW for females only (p < 0.05). In class I group, Pearson's correlation coefficients between dental and basal measurements showed a strong correlation in the IMW for both genders (r > 0.73; p < 0.01) and a moderate correlation in females' ICW (r = 0.67; p < 0.01). In the class group, a moderate correlation in females' IMW (r = 0.67; p < 0.01) was found. Conclusion: Females compared with males had narrower dimensions. Class I patients had larger ICW than class II-1 patients in all measurements and had narrower IMW than class in most measurements for both genders. There were moderate-to-strong correlations between dental and basal dimensions. BBC points might be landmarks that accurately represent the basal bone arch. Clinical significance: CBCT-based assessments of dental and basal arch dimensions provide a great opportunity to accurately evaluate these aspects, to enhance clinicians' decisions regarding proper tooth movements, and to achieve good dentoalveolar intra-arch harmony. Keywords: Basal arch, Class I, Class Cone-beam computed tomography, Dental arch, Intercanine width, Intermolar width.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Arco Dental/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase I/diagnóstico por imagen , Mandíbula/diagnóstico por imagen , Adolescente , Adulto , Femenino , Humanos , Masculino , Siria , Adulto Joven
14.
Am J Orthod Dentofacial Orthop ; 153(5): 692-700, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29706217

RESUMEN

INTRODUCTION: The purpose of this study was to investigate maxillomandibular transverse widths and molar inclinations of adults with hypodivergent, normodivergent, and hyperdivergent facial patterns using cone-beam computed tomography. METHODS: We evaluated Class I subjects (55 men, 66 women) who were divided into hypodivergent (<27°), normodivergent (28°-37°), and hyperdivergent (>38°) groups by their mandibular plane angles. Frontal and coronal views of the images were analyzed. Sex differences, vertical facial pattern differences, and related factors were assessed with independent 2-sample t tests, 1-way analysis of variance followed by post hoc Tukey tests, and Pearson correlation analysis. RESULTS: The hypodivergent group had greater maxillary alveolar widths 7 mm apically from the alveolar crest. The intermolar widths and molar inclinations showed no significant differences among the groups. As the mandibular plane angles increased, interjugular widths, transverse mandibular widths, and buccolingual maxillary alveolar widths at the midroot level decreased, whereas the maxillomandibular width differences and palatal heights increased im both sexes. CONCLUSIONS: An increase in the mandibular plane angle is associated with tendencies of narrow mandibular arches, thinner maxillary alveolar bones at the midroot level, and higher palatal arches in both sexes. Intermolar widths and molar inclinations were not significantly affected by vertical facial patterns.


Asunto(s)
Tomografía Computarizada de Haz Cónico , Imagenología Tridimensional , Maloclusión de Angle Clase I/diagnóstico por imagen , Mandíbula/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Adulto , Femenino , Humanos , Masculino , Diente Molar , Estudios Retrospectivos , Adulto Joven
15.
Int Orthod ; 16(2): 384-407, 2018 06.
Artículo en Inglés | MEDLINE | ID: mdl-29650346

RESUMEN

In his daily practice, the orthodontist is regularly asked to treat patients with one or more missing teeth. Considering their functional and esthetic specificities, and the relatively high frequency of agenesia, our interest was to focus on the permanent lateral upper incisors. Our study, based on an orthodontic population including 1000 patients, shows that about 7.8% of these patients present agenesis of at least one permanent tooth (out of which 3.6% are agenesis of the upper lateral incisor). Treatment options for these cases are multiple with several decisional factors to consider: the solutions often lead to compromises, and require a multidisciplinary coordination. Therefore, the purpose of this article, was to describe the prevalence of these agenesia based on a retrospective study, and to present two clinical cases: the first case is a bilateral agenesis of the maxillary lateral incisors treated with space opening in order to place two implant-supported restorations. The second case is an agenesis of tooth 12 treated with space reopening and the placement of a cantilever bridge. These clinical cases are presented to illustrate the multidisciplinary approach involving orthodontics, prosthodontics, and periodontology, in order to achieve the most esthetic and functional results possible.


Asunto(s)
Anodoncia/epidemiología , Anodoncia/terapia , Incisivo/anomalías , Maxilar/anomalías , Adolescente , Anodoncia/diagnóstico por imagen , Diente Premolar , Cefalometría , Implantación Dental Endoósea/métodos , Implantes Dentales de Diente Único , Diseño de Prótesis Dental , Prótesis Dental de Soporte Implantado , Dentición Permanente , Estética Dental , Femenino , Humanos , Incisivo/diagnóstico por imagen , Masculino , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase I/terapia , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Maxilar/diagnóstico por imagen , Cierre del Espacio Ortodóncico/métodos , Ortodoncia Correctiva/métodos , Sobremordida/epidemiología , Sobremordida/terapia , Prevalencia , Radiografía Panorámica , Estudios Retrospectivos , Técnicas de Movimiento Dental/métodos , Resultado del Tratamiento , Túnez/epidemiología , Adulto Joven
16.
J Orofac Orthop ; 79(3): 181-190, 2018 May.
Artículo en Inglés | MEDLINE | ID: mdl-29651519

RESUMEN

OBJECTIVES: Purpose of the present study was to compare external root resorption (ERR) volumetrically in maxillary incisors induced by orthodontic treatment using self-ligating brackets (Damon Q, DQ) or conventional brackets (Titanium Orthos, TO) with the help of cone-beam computed tomography (CBCT). PATIENTS AND METHODS: A sample of 32 subjects, with Angle Class I malocclusion and anterior crowding of 4-10 mm, was divided randomly into two groups: a DQ group, in which self-ligating DQ brackets with Damon archwires were used; and a TO group, in which conventional TO brackets with large Orthos archwires were applied. The study was conducted using CBCT scans taken before (T1), and near the end (9 months after the initiation of treatment; T2) of the orthodontic treatment. The extent of ERR was determined volumetrically using Mimics software. Changes in root volume were evaluated by repeated-measures analysis of variance as well as by paired and independent t-tests. RESULTS: While significant differences were found between T1 and T2 for root volume in both groups (p < 0.05), there was no difference between the groups regarding the amount (mm3 or relative change) of ERR (p > 0.05). Maxillary central and lateral incisors showed similar volume loss (p > 0.05). Furthermore, the TO group showed a higher prevalence of palatinal and proximal slanted RR compared with the DQ group (p < 0.05). CONCLUSIONS: It is not possible to suggest superiority of one bracket system over the other only considering root resorption pattern or amount. Higher incidence of slanted RR found in patients treated with the TO system warrants further research to identify possible specific causes.


Asunto(s)
Maloclusión de Angle Clase I/terapia , Soportes Ortodóncicos/efectos adversos , Resorción Radicular/etiología , Adolescente , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Incisivo/fisiopatología , Masculino , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase I/fisiopatología , Diseño de Aparato Ortodóncico , Técnicas de Movimiento Dental/instrumentación , Técnicas de Movimiento Dental/métodos
17.
Int Orthod ; 16(2): 314-327, 2018 06.
Artículo en Inglés | MEDLINE | ID: mdl-29673688

RESUMEN

AIM: The aim of the study was to assess the reliability and validity of cephalometric variables from MicroScribe-3DXL. MATERIALS AND METHODS: Seven cephalometric variables (facial angle, ANB, maxillary depth, U1/FH, FMA, IMPA, FMIA) were measured by a dentist in 60 Malay subjects (30 males and 30 females) with class I occlusion and balanced face. Two standard images were taken for each subject with conventional cephalometric radiography and MicroScribe-3DXL. All the images were traced and analysed. SPSS version 2.0 was used for statistical analysis with P-value was set at P<0.05. RESULTS: The results revealed a significant statistic difference in four measurements (U1/FH, FMA, IMPA, FMIA) with P-value range (0.00 to 0.03). The difference in the measurements was considered clinically acceptable. The overall reliability of MicroScribe-3DXL was 92.7% and its validity was 91.8%. CONCLUSION: The MicroScribe-3DXL is reliable and valid to most of the cephalometric variables with the advantages of saving time and cost. This is a promising device to assist in diverse areas in dental practice and research.


Asunto(s)
Cefalometría/métodos , Cara/anatomía & histología , Procesamiento de Imagen Asistido por Computador/métodos , Imagenología Tridimensional/métodos , Maloclusión de Angle Clase I/diagnóstico por imagen , Maxilar/anatomía & histología , Adolescente , Adulto , Puntos Anatómicos de Referencia/diagnóstico por imagen , Cefalometría/instrumentación , Cefalometría/estadística & datos numéricos , Análisis Costo-Beneficio , Cara/diagnóstico por imagen , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador/instrumentación , Procesamiento de Imagen Asistido por Computador/estadística & datos numéricos , Imagenología Tridimensional/instrumentación , Malasia , Masculino , Mandíbula/anatomía & histología , Maxilar/diagnóstico por imagen , Reproducibilidad de los Resultados , Programas Informáticos , Factores de Tiempo , Adulto Joven
18.
Am J Orthod Dentofacial Orthop ; 153(4): 577-587, 2018 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-29602350

RESUMEN

This article reports the case of a 24-year-old man with a large anterior open bite, mild mandibular crowding, increased overjet, no passive lip sealing, and Angle Class I malocclusion. The treatment results were achieved by mandibular molar intrusion using 1.8 × 8.5-mm mini-implants (C-implants) inserted between the mandibular first and second molars bilaterally. A 2.5-mm molar intrusion and open-bite closure occurred within 8 months. The multiloop edgewise archwire technique helped to intrude the posterior teeth. Total treatment time was 20 months. Fifty months postretention records are also presented. The patient achieved a suitable occlusion and satisfactory facial esthetics at the end of treatment and at the 50-month retention check.


Asunto(s)
Implantes Dentales , Mandíbula , Mordida Abierta/terapia , Métodos de Anclaje en Ortodoncia/métodos , Alambres para Ortodoncia , Técnicas de Movimiento Dental/métodos , Adulto , Cefalometría/métodos , Modelos Dentales , Oclusión Dental , Estética Dental , Humanos , Labio/anatomía & histología , Masculino , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase I/terapia , Mandíbula/diagnóstico por imagen , Diente Molar , Mordida Abierta/diagnóstico por imagen , Métodos de Anclaje en Ortodoncia/instrumentación , Diseño de Aparato Ortodóncico , Sobremordida/diagnóstico por imagen , Sobremordida/terapia , Planificación de Atención al Paciente , Satisfacción del Paciente , Radiografía Panorámica , Rotación , Técnicas de Movimiento Dental/instrumentación , Resultado del Tratamiento , Dimensión Vertical , Adulto Joven
19.
Am J Orthod Dentofacial Orthop ; 153(3): 436-444, 2018 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-29501119

RESUMEN

Patients with bimaxillary protrusion may have an unattractive profile with a retruded chin contour. Correction of the severely protrusive anterior alveolar bone and teeth combined with a moderate open bite without orthognathic surgery can be challenging. This case report describes the orthodontic treatment of a woman with severe bimaxillary protrusion and a moderate open bite. Excellent chin morphology and facial appearance were obtained with the extraction of 4 first premolars and 4 third molars, and total distalization of both arches with 4 mini-implants, one in each quadrant between the second premolar and the first molar. The total treatment time was 30 months.


Asunto(s)
Mentón , Estética Dental , Maloclusión de Angle Clase I/terapia , Mordida Abierta/terapia , Ortodoncia Correctiva , Cefalometría , China , Modelos Dentales , Femenino , Humanos , Maloclusión de Angle Clase I/diagnóstico por imagen , Mordida Abierta/diagnóstico por imagen , Radiografía Panorámica , Extracción Dental , Adulto Joven
20.
Angle Orthod ; 88(1): 52-57, 2018 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-28949768

RESUMEN

OBJECTIVES: To investigate the retromolar space available for molar distalization in patients with mandibular prognathism. MATERIALS AND METHODS: Using cone-beam computed tomography, the posterior mandibular dimensions in 110 consecutive patients with Class I or Class III malocclusion were measured (mean age, 27.0 ± 7.1 years). The shortest linear distances from the distal root of the right mandibular second molar to the inner border of the mandibular cortex were measured at the level of root furcation and 2, 4, and 6 mm apical to the furcation along the sagittal line and the posterior line of occlusion. The retromolar distances were compared between the Class I and Class III malocclusion groups using general linear mixed models. RESULTS: The retromolar space measured through the sagittal line showed no significant intergroup difference. Among the distances measured through the posterior line of occlusion, the space measured at depths 0 and 2 mm to the furcation were significantly greater in the Class III group than in the Class I group. CONCLUSIONS: Patients with Class III malocclusion have greater retromolar space for mandibular molar distalization along the posterior line of occlusion only at the level of the second molar furcation.


Asunto(s)
Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase III/terapia , Maloclusión de Angle Clase I/diagnóstico por imagen , Maloclusión de Angle Clase I/terapia , Mandíbula/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Métodos de Anclaje en Ortodoncia , Prognatismo/diagnóstico por imagen , Prognatismo/terapia , Adulto , Estudios de Casos y Controles , Cefalometría , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Imagenología Tridimensional , Masculino , Estudios Retrospectivos , Resultado del Tratamiento
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