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1.
Eur J Paediatr Dent ; 22(1): 26-30, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-33719479

RESUMEN

AIM: The current study aimed to analyse the dentoskeletal effects of the Invisalign mandibular advancement (MA) device in the treatment of skeletal Class II malocclusions. MATERIALS AND METHODS: Pre-treatment and post-treatment lateral skull radiographs from patients treated with MA versus TB (Twin-Block Appliance) at the Department of Orthodontics of the University of L'Aquila, Italy, were traced. Eligibility criteria included SNB<78; ANB>4; no previous orthodontic treatments; and vertebral maturation stage (CVM) CS3. Radiographs from patients with craniofacial anomalies, or who underwent extraction treatments, were excluded. Totally, 20 patients were examined, 10 of whom treated with MA and 10 treated with TB. All the radiographs were traced by one expert operator, blind to the groups. A preliminary method error study was performed to exclude intra-operator differences. RESULTS: Baseline characteristics of the participants were similar between the groups. Both appliances demonstrated a reduction of SNB and ANB angle, and a decrease in overjet. TB demonstrated a higher efficacy in increasing mandibular dimensions. A significant retroinclination of the upper incisive was observed in the TB group, where a decrease of SNA angles was additionally observed. The resulting differences between the two groups could be attributed to the different design of the appliances. CONCLUSIONS: The present data show the effectiveness of both TB and MA in the management of skeletal Class II malocclusions due to mandibular retrusion. But some differences exist in the dentoalveolar effect of the two appliances. MA seems indicated in Class II cases where a control of the upper frontal teeth position is needed.


Asunto(s)
Maloclusión de Angle Clase II , Avance Mandibular , Aparatos Ortodóncicos Funcionales , Aparatos Ortodóncicos Removibles , Cefalometría , Humanos , Italia , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula , Estudios Retrospectivos , Resultado del Tratamiento
2.
Head Face Med ; 17(1): 4, 2021 Feb 05.
Artículo en Inglés | MEDLINE | ID: mdl-33546715

RESUMEN

BACKGROUND: The purpose of this study was to analyze the relationship between body posture and sagittal dental overjet in children before and after early orthodontic treatment with removable functional orthodontic appliances. METHODS: Angle Class II patients (mean age 8.2 ± 1.2 years; 29 males and 25 females) with a distinctly enlarged overjet (> 9 mm) were retrospectively examined regarding body posture parameters before and after early orthodontic treatment. In addition, changes in overjet were investigated with the aid of plaster models. Forms of transverse dysgnathism (crossbite, lateral malocclusions) and open bite cases were excluded. Body posture parameters kyphosis, lordosis, surface rotation, pelvic tilt, pelvic torsion and trunk imbalance were analyzed by means of rasterstereographical photogrammetry to determine, if the orthodontic overjet correction is associated with specific changes in posture patterns. RESULTS: In nearly all patients an overjet correction and an improvement regarding all body posture and back parameters could be noted after early orthodontic treatment. Overjet reduction (- 3.9 mm ± 2.1 mm) and pelvic torsion (- 1.28° ± 0,44°) were significantly (p < 0.05) and moderately correlated (R = 0.338) with no significant associations found for the other posture and back parameters (p > 0.05). CONCLUSION: Overjet reduction during early orthodontic treatment may be associated with a detectable effect on pelvic torsion.


Asunto(s)
Maloclusión de Angle Clase II , Maloclusión , Aparatos Ortodóncicos Funcionales , Niño , Femenino , Humanos , Masculino , Maloclusión/diagnóstico por imagen , Maloclusión/terapia , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Postura , Estudios Retrospectivos
3.
Am J Orthod Dentofacial Orthop ; 159(4): 470-479, 2021 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-33558030

RESUMEN

INTRODUCTION: The aims of this study were to evaluate the long-term skeletodental effects, the volume of maxillary tuberosity, and airway space changes after maxillary molar distalization using modified C-palatal plate (MCPP) in adolescents with Class II malocclusion. METHODS: The sample consisted of 20 adolescent patients (MCPP group; mean age, 12.9 ± 1.0 year) who underwent bilateral distalization of their maxillary dentition and 20 subjects as a control group. In the MCPP group, cone-beam computed tomography images were taken before distalization, at the end of the treatment, and during retention with a minimum of a 3-year posttreatment follow up period. Repeated measures ANOVA followed by post-hoc analysis with the Bonferroni test were used to identify significant differences between time points. RESULTS: After the long-term observation period, sagittal skeletal and dental relationships were maintained (there were no significant changes in ANB, occlusal plane angle, and overjet postretention). The vertical skeletal dimension did not change during treatment and was stable at the long-term follow-up (the mandibular plane angle and ANS-Me were relatively well maintained). The volume of the maxillary tuberosity showed no significant change during long-term retention. However, the volume was significantly smaller in the treatment group than in the control group (P <0.0001). There were no significant airway space changes after distalization and the postretention period. In addition, there was no significant difference between the MCPP and control groups. CONCLUSIONS: Improved sagittal skeletal and dental relationships because of treatment were maintained in the long-term evaluation. There was no negative long-term effect on airway space associated with the maxillary arch distalization. Therefore, these findings might be beneficial for clinicians in diagnosis and treatment planning for Class II malocclusion in adolescents.


Asunto(s)
Maloclusión de Angle Clase II , Técnicas de Movimiento Dental , Adolescente , Cefalometría , Niño , Tomografía Computarizada de Haz Cónico , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Maxilar/diagnóstico por imagen , Diseño de Aparato Ortodóncico
5.
Am J Orthod Dentofacial Orthop ; 159(2): 148-157, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33388197

RESUMEN

INTRODUCTION: This study aimed to compare cephalometrically the pharyngeal airway, hyoid bone, and soft palate (SP) changes after Class II malocclusion treatments using Twin-block (TWB) and Forsus Fatigue Resistant Device (FFRD) (3M Unitek Corp, 3M Dental Products, Monrovia, Calif) during the postpeak growth period. METHODS: Forty-two patients with Class II malocclusion treated during the postpeak growth period were randomly and retrospectively included in this study. These patients were divided into 2 treatment groups: TWB and FFRD. The skeletal, dental, pharyngeal airway, hyoid bone position, and SP measurements were obtained from the lateral cephalometric radiographs taken at the beginning and at the end of the treatment. Paired-samples and independent-samples t tests were used for the intragroup and intergroup comparisons, respectively. RESULTS: In the TWB group, the SNB (°), Md1-NB (mm), Md1-NB (°), and McNamara upper and lower pharyngeal airway dimensions significantly increased, whereas the ANB (°), AD1-Ba (mm), AD2-H (mm), adenoidal nasopharyngeal area, and SP angle decreased (P < 0.05). In the FFRD group, the SNB (°), Md1-NB (mm), Md1-NB (°), Ptm-Ba (mm), and McNamara upper airway dimensions significantly increased, whereas the ANB (°), AD2-H (mm), and interincisor angle decreased (P < 0.05). Moreover, there were statistically significant differences in the Md1-NB angles and SP thicknesses between the 2 groups (P < 0.05). CONCLUSIONS: The effects of TWB and FFRD treatment on the airway during the postpeak growth period were similar. However, the FFRD caused a greater mandibular incisor protrusion.


Asunto(s)
Maloclusión de Angle Clase II , Aparatos Ortodóncicos Funcionales , Cefalometría , Humanos , Hueso Hioides/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula/diagnóstico por imagen , Paladar Blando/diagnóstico por imagen , Faringe/diagnóstico por imagen , Estudios Retrospectivos
6.
Am J Orthod Dentofacial Orthop ; 159(2): 202-209.e2, 2021 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-33388198

RESUMEN

INTRODUCTION: This study aimed to establish mathematical equations to describe the dental and basal arch forms in skeletal Class II malocclusion and to investigate correlations between these forms to facilitate clinical diagnosis and treatment design. METHODS: Cone-beam computed tomography images of 60 patients (30 each with skeletal Class II malocclusion and normal occlusion) were subjected to 3-dimensional volume rendering, image reconstruction, and measurement. Using a computer program written in Java on the Eclipse platform (Eclipse Foundation, Ottawa, Canada), a beta function was used to establish mathematical models of dental and basal bone arch forms, and model-fitting was performed. RESULTS: A mathematical model was developed to describe the dental and basal arch forms in skeletal Class II malocclusion. The maxillary and mandibular dental arch lengths were significantly longer in skeletal Class II malocclusion than in normal occlusion, whereas the width of the maxillary molar segment was smaller. The maxillary molar and mandibular intercranial segments in the basal arch were significantly longer in skeletal Class II malocclusion than in normal occlusion, whereas the mandibular intercranial segment width was smaller. CONCLUSIONS: The dental arch and basal bone arch forms in the maxilla and mandible follow individual curves, described by a beta function. In skeletal Class II malocclusion, the dental and basal arches are discrepant in horizontal and anteroposterior dimensions, which should be considered during orthodontic treatment planning to improve arch matching.


Asunto(s)
Arco Dental , Maloclusión de Angle Clase II , Canadá , Cefalometría , Arco Dental/diagnóstico por imagen , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula/diagnóstico por imagen , Maxilar/diagnóstico por imagen
7.
Am J Orthod Dentofacial Orthop ; 159(3): 292-304, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-33487502

RESUMEN

INTRODUCTION: The purpose of this prospective clinical trial is to evaluate the changes of soft tissues and designate the esthetic perceptions of children with Class II malocclusion after Herbst appliance therapy and maxillary molar distalization using stereophotogrammetry. METHODS: Thirty patients were allocated either to Herbst (6 boys and 9 girls; mean age = 11.60 ± 0.82 years) or distalization (4 boys and 11 girls; mean age = 11.46 ± 1.30 years) groups. Dentoskeletal and soft-tissue treatment changes were examined objectively by cephalometric analysis and stereophotogrammetry, respectively. Pre- and posttreatment profile views were evaluated subjectively by orthodontists and laypeople using the 7-point Likert scale. Intra- and intergroup comparisons for the repeated measurements were performed with 2-way variance analysis. Bonferroni test was used for multiple comparisons (P ≤0.05). RESULTS: Greater skeletal changes were observed in the Herbst group than in the distalization group. Maxillary incisor retrusion and mandibular incisor protrusion were observed in the distalization and Herbst groups, respectively. Stereophotogrammetric measurements showed that mandibular body length and lower and anterior facial height increased in both treatment groups. Convexity angle (P = 0.020) and labiomental angle (P = 0.033) were greater in the Herbst group than the distalization group. CONCLUSIONS: The skeletal contribution to correction of maxillomandibular discrepancy was greater in the Herbst group than the distalization group. Significant profile improvements were recorded for both groups with treatment. After both treatments, orthodontists were found to have higher rates of detection in the profiles than laypeople. The esthetic contribution of treatments to the facial profile was found similar in both groups.


Asunto(s)
Maloclusión de Angle Clase II , Aparatos Ortodóncicos Funcionales , Cefalometría , Niño , Estética Dental , Femenino , Humanos , Masculino , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula , Percepción , Estudios Prospectivos , Resultado del Tratamiento
8.
Angle Orthod ; 91(2): 149-156, 2021 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-33434285

RESUMEN

OBJECTIVES: To determine dentoalveolar and skeletal effects produced in mature patients by the Carriere Motion Class III (CM3) appliance followed by fixed appliances. MATERIALS AND METHODS: This retrospective study evaluated 32 patients at three time points: T1 (initial), T2 (removal of CM3), and T3 (posttreatment). Serial cephalograms were traced and digitized, and best-fit regional superimpositions were constructed. Eleven linear and 7 angular variables were measured. The starting forms of the CM3 patients were compared with a sample of untreated subjects with normal occlusions and well-balanced faces. RESULTS: The CM3 phase lasted 6.3 months, followed by a phase of fixed appliances lasting 12.9 months; the total duration of treatment was 19.2 months. Minimal skeletal changes were measured sagittally, with only a slight increase in lower anterior facial height observed during treatment. Most treatment changes were dentoalveolar in nature. Wits appraisal increased 4.0 mm during treatment. The molar relationship improved by 6.0 mm during phase I, a value that rebounded slightly during phase II, resulting in an improvement toward Class I of 4.8 mm. Best-fit regional superimpositions revealed anterior movement of upper molars relative to the maxilla and posterior movement of lower molars relative to the mandible. CONCLUSIONS: The Carriere Motion Class III appliance is an effective and efficient method of resolving occlusal problems in minimally growing Class III patients. Primary treatment effects are dentoalveolar in nature with minimal skeletal alterations.


Asunto(s)
Maloclusión de Angle Clase II , Aparatos Ortodóncicos Funcionales , Adolescente , Adulto , Cefalometría , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula , Maxilar , Diseño de Aparato Ortodóncico , Aparatos Ortodóncicos Fijos , Estudios Retrospectivos
9.
Angle Orthod ; 91(1): 22-29, 2021 01 01.
Artículo en Inglés | MEDLINE | ID: mdl-33339047

RESUMEN

OBJECTIVES: To compare the dental and skeletal treatment effects after total arch distalization using modified C-palatal plates (MCPPs) on adolescent patients with hypo- and hyperdivergent Class II malocclusion. MATERIALS AND METHODS: The study group included 40 patients with Class II malocclusion (18 boys and 22 girls, mean age = 12.2 ± 1.4 years) treated with MCPPs. Fixed orthodontic treatment started with the distalizing process in both groups. Participants were divided into hypo- or hyperdivergent groups based on their pretreatment Frankfort mandibular plane angle (FMA) ≤22° or ≥28°, respectively. Pre- and posttreatment lateral cephalograms were digitized, and 23 variables were measured and compared for both groups using paired and independent t-tests. RESULTS: The hyper- and hypodivergent groups showed 2.7 mm and 4.3 mm of first molar crown distalizing movement, respectively (P < .001). The hypodivergent group had a slight 2.2° crown distal tipping of first molars compared with 0.3° in the hyperdivergent group. After distalization, the FMA increased 3.1° and 0.3°, in the hypodivergent and hyperdivergent groups, respectively (P < .001). SNA decreased in the hypodivergent group, while other skeletal variables presented no statistically significant differences in the changes between the groups. CONCLUSIONS: The hypodivergent group showed more distal and tipping movement of the maxillary first molar and increased FMA than the hyperdivergent group. Therefore, clinicians must consider vertical facial types when distalizing molars using MCPPs in Class II nonextraction treatment.


Asunto(s)
Maloclusión de Angle Clase II , Diseño de Aparato Ortodóncico , Adolescente , Cefalometría , Femenino , Humanos , Masculino , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Maxilar , Técnicas de Movimiento Dental
10.
Angle Orthod ; 91(2): 255-266, 2021 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378419

RESUMEN

OBJECTIVES: To compare the effects of Forsus appliances with and without temporary anchorage devices (TADs) for patients with skeletal Class II malocclusion. MATERIALS AND METHODS: Through a predefined search strategy, electronic searching was conducted in PubMed, Embase, Web of Science, CENTRAL, ProQuest Dissertations & Theses, and SIGLE with no language restrictions. Eligible study selection, data extraction, and evaluation of risk of bias (Cochrane Collaboration tool) were conducted by two authors independently and in duplicate. Any disagreement was solved by discussion or judged by a third reviewer. Statistical pooling, sensitivity analysis, subgroup analysis, and assessment of small-study effects were conducted by using Comprehensive Meta-Analysis and Stata 12.0. Heterogeneity was analyzed for different types of study designs, TADs, and radiographic examinations. RESULTS: Electronic search yielded a total of 256 studies after removing duplicates. Among them, six studies were finally included. All articles were of high quality. The pooled mean differences were -0.27 (95% confidence interval [CI]: -0.59, 0.05) for SNA, 0.58 (95% CI: -0.07, 1.23) for SNB, -0.86 (95% CI: -1.74, -0.03) for ANB, 1.63 (95% CI: 0.46, 2.80) for Co-Po, 0.75 (95% CI: 0.28, 1.23) for SN-MP, -7.56 (95% CI: -11.37, -3.76) for L1-MP, 0.47 (95% CI: -0.98, 1.91) for overjet, 0.39 (95% CI: -0.57, 1.35) for overbite, -1.84 (95% CI: -5.15, 1.47) for SN-OP, and 4.97 (95% CI: -1.22, 11.17) for nasolabial angle. CONCLUSIONS: TADs (especially miniplates) were able to eliminate dental adverse effects of Forsus appliances for correction of skeletal Class II malocclusion.


Asunto(s)
Maloclusión de Angle Clase II , Aparatos Ortodóncicos Funcionales , Sobremordida , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula , Ortodoncia Correctiva
11.
Angle Orthod ; 90(3): 362-368, 2020 05 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378427

RESUMEN

OBJECTIVE: To investigate treatment stability of miniscrew-anchored maxillary distalization in Class II malocclusion. MATERIALS AND METHODS: This retrospective study included a distalization (n = 19) and a control (n = 19) group; a patient group with minor corrections served the control. Lateral cephalograms of 38 adult patients were taken before (T0), immediately after (T1), and 3-4 years after (T2) treatment. Horizontal and vertical movement and tipping of the maxillary first molars (U6) and central incisors (U1) were measured along with skeletal craniofacial parameters at three time points to compare the two groups regarding the achieved treatment effects and their stability. RESULTS: Total arch distalization therapy led to 4.2 mm of distal movement of U6 without distal crown tipping (0.6° of axis change) and 3.3° of occlusal plane steepening. Over an average retention period of 42 months, maxillary total arch distalization provided high stability of treatment results, showing the same amount of mesial movement (0.7 mm) as the control group. CONCLUSIONS: In Class II treatment, miniscrew-anchored maxillary total arch distalization can provide stable distal movement of the maxillary first molars and central incisors.


Asunto(s)
Maloclusión de Angle Clase II , Métodos de Anclaje en Ortodoncia , Adulto , Cefalometría , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Maxilar , Diente Molar/diagnóstico por imagen , Diseño de Aparato Ortodóncico , Estudios Retrospectivos , Técnicas de Movimiento Dental
12.
Angle Orthod ; 90(4): 571-577, 2020 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378491

RESUMEN

OBJECTIVE: To evaluate the esthetic perceptions of orthodontists and laypersons for facial profile changes after orthodontic treatment using Herbst or Forsus appliances. MATERIALS AND METHODS: Pre- and posttreatment facial profile contour images of 20 Class II patients treated with Herbst (group H; n = 10) and Forsus (group F; n = 10) appliances were analyzed by 30 orthodontists and 30 laypersons, who graded them from 1 (unattractive) to 10 (very attractive) using a visual analog scale. Two assessments were carried out with a 15 day-interval. In the first evaluation, 40 images were presented in a random sequence. In the second evaluation, initial and final facial profile images of each patient were randomly presented side by side. To compare groups in relation to treatment method, Mann-Whitney tests were used. To evaluate differences between time points, Wilcoxon tests were used. RESULTS: In the first evaluation, there was a significant difference between initial and final images only for group H, for both laypersons (P = .017) and orthodontists (P = .037). There was also a significant difference between laypersons and orthodontists in their ratings of posttreatment Herbst appliance profiles (P = .028). There was no significant difference between initial and final facial profile images for group F and no significant differences between or within evaluator groups in their ratings of initial or final Forsus appliance profiles. In the second evaluation, there was a significant difference between appliance groups only for laypersons, who considered cases treated with the Herbst appliance more attractive than those treated with the Forsus (P = .031). Laypersons also considered Herbst profiles more attractive than did orthodontists (P = .047). CONCLUSIONS: Class II malocclusion treatment using the Herbst appliance may produce a more esthetically improved facial profile silhouette compared with Forsus appliances. The magnitude of perceived changes may not be considered clinically relevant.


Asunto(s)
Maloclusión de Angle Clase II , Aparatos Ortodóncicos Funcionales , Cefalometría , Estética , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Percepción , Resultado del Tratamiento
13.
Angle Orthod ; 90(4): 491-499, 2020 07 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378493

RESUMEN

OBJECTIVES: To determine three-dimensional treatment changes produced by the Class II Carriere Motion appliance (CMA) in Class II adolescent patients with Class I and Class II skeletal relationships. MATERIALS AND METHODS: The sample included 59 adolescents (16 boys and 43 girls) with unilateral or bilateral Class II molar and bilateral Class II canine relationship. They were divided into group 1 with skeletal Class I (N = 27; ANB 2.90° ± 1.40°; 13.30 ± 1.53 years) and group 2 with skeletal Class II (N = 32; ANB 6.06° ± 1.64°; 13.26 ± 1.76 years). Cone beam computed tomography images were traced with Invivo software pretreatment (T1) and post-CMA usage (T2). The treatment changes in 36 measurements were calculated in each group, and the changes in 16 measurements were compared between them. RESULTS: In group 1 and 2, maxillary first molars underwent significant distal movement (1.92 mm ± 0.80 mm and 1.67 mm ± 1.56 mm, respectively) with distal tipping and rotation, maxillary canines underwent significant distal movement (2.34 mm ± 1.07 mm and 2.24 mm ± 1.91 mm, respectively) with distal tipping and rotation, and mandibular molars underwent significant mesial movement (-1.37 mm ± 1.23 mm and -2.51 mm ± 1.51 mm, respectively) with mesial tipping. Between the groups, there were significant differences in mandibular molar mesial movement and the U1-SN changes (P < .05). CONCLUSIONS: The CMA corrected Class II malocclusion through distal tipping and rotational movement of maxillary canines and molars and corrected mesial tipping of mandibular molars. Significantly more mandibular molar mesial movement and maxillary incisor flaring were observed in patients with skeletal Class II.


Asunto(s)
Maloclusión de Angle Clase II , Adolescente , Cefalometría , Femenino , Humanos , Incisivo , Masculino , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Maxilar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen , Diseño de Aparato Ortodóncico , Técnicas de Movimiento Dental
14.
Angle Orthod ; 90(6): 783-793, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378509

RESUMEN

OBJECTIVE: To evaluate the effects of functional appliance treatment on mandibular trabecular structure using fractal dimension (FD) analysis of dental panoramic radiographs. MATERIALS AND METHODS: This study was conducted using digital panoramic radiographs of 45 patients with Class II malocclusion treated with functional appliances (treatment group, mean age: 11.39 ± 0.97 years; 23 girls, 22 boys) acquired before (T0) and after (T1) treatment and the panoramic radiographs of 45 control subjects who had undergone no orthodontic treatment (control group, mean age: 11.31 ± 0.87 years; 23 girls, 22 boys). FD values in the condylar process, mandibular corpus, and mandibular angle were analyzed from the panoramic radiographs of both groups. RESULTS: Analysis of changes in FD between T0 and T1 revealed significant increases in the FD values of the right and left condylar processes and right mandibular corpus in the treatment group (P < .001) and in the right condylar process in the control group (P < .05). Between-group comparisons demonstrated that the treatment group showed greater changes in the condylar process (right, P < .001; left, P < .05) and right mandibular corpus (P < .05) compared to controls. Correlation analysis between the cephalometric and FD changes in the treatment group showed the right condylar process changes were negatively correlated with GoGn/SN angle (P < .05) and positively correlated with Co-Go (P < .05), although these correlations were weak. CONCLUSIONS: FD analysis demonstrated significant changes in trabeculation of the condyle and mandibular corpus in the treatment group compared to the control group. Functional appliance treatment may lead to skeletal correction by altering skeletal form and trabeculation of the mandibular bone.


Asunto(s)
Fractales , Maloclusión de Angle Clase II , Cefalometría , Niño , Femenino , Humanos , Masculino , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula/diagnóstico por imagen , Radiografía Panorámica
15.
Angle Orthod ; 90(6): 851-856, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378513

RESUMEN

OBJECTIVE: To compare second molar angulation to the occlusal plane with cephalometric measurements corresponding to AP skeletal discrepancy. MATERIALS AND METHODS: 72 patients' pre-orthodontic records were analyzed. A plane was constructed along the cusps of the upper second molar and measured to a proxy for the occlusal plane. The angle between the planes was measured. ANB, Wits appraisal, U1-SN, IMPA, A-B perpendicular to Frankfort, and overjet were measured on the patients' cephalograms. Generalized additive mixed model analysis was performed to analyze the relationship between the second molar angulation and the cephalometric measurements. RESULTS: All six cephalometric measurements showed a significant relationship with the second molar angulation, with Class III patients having a larger angle than Class II and I patients. CONCLUSIONS: Class III patients have upper second molars that are significantly tipped from the occlusal plane. The second molars require special attention for correction prior to orthognathic surgery for Class III patients in order to avoid deleterious effects from the malpositioned teeth.


Asunto(s)
Maloclusión de Angle Clase III , Maloclusión de Angle Clase II , Cefalometría , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase III/diagnóstico por imagen , Mandíbula/diagnóstico por imagen , Maxilar/diagnóstico por imagen , Diente Molar/diagnóstico por imagen
16.
Angle Orthod ; 90(6): 794-800, 2020 11 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378521

RESUMEN

OBJECTIVES: To determine whether there was a correlation between patients' bone thickness and time spent in orthodontic treatment. The secondary aim was to study the influence of Angle classification, extraction treatment, and age on overall treatment duration. MATERIALS AND METHODS: In this retrospective study, records of 971 orthodontic patients from two centers were reviewed and 500 subjects were included after imposing inclusion/exclusion criteria. The Mental Index was used to determine patients' bone density. For the Mental Index, a line perpendicular to the inferior border of the mandible was drawn on a panoramic radiograph so that it intersected the inferior border of the mental foramen. The mandibular cortical thickness was measured along this line. Two-sample t-test or a chi-square test, followed by multiple linear regression, were used to identify the factors affecting treatment duration. RESULTS: Mandibular cortical thickness was negatively associated with treatment time for all subjects (P < .05). After adjusting for covariables, it remained significant for center-1, but non-significant for center-2 subjects. Angle Class II and Class III malocclusion, extraction therapy, and age had significant positive correlations with treatment duration (P < .05). CONCLUSIONS: There is a negative correlation between the mandibular cortical thickness and orthodontic treatment duration. An extraction treatment plan and treatment of Angle Class II and Class III malocclusions significantly increase the duration of orthodontic treatment. Additionally, patients over 12 years of age have shorter treatment times compared to patients under 12 years of age.


Asunto(s)
Maloclusión de Angle Clase II , Mandíbula , Cefalometría , Niño , Hueso Cortical/diagnóstico por imagen , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula/diagnóstico por imagen , Radiografía Panorámica , Estudios Retrospectivos
17.
J Clin Pediatr Dent ; 44(4): 274-282, 2020 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-33167022

RESUMEN

OBJECTIVE: To investigate the cephalometric changes following anterior repositioning of the mandible for predicting the treatment effects in Class II adolescent patients. STUDY DESIGN: Lateral cephalograms of 28 patients (ANB > 4°) were taken in centric occlusion (CO) and edge-to-edge bite (EtoE) before orthodontic treatment. The patients were classified into two groups according to their mandibular plane angle [MPA; low MPA (LMPA) ≤ 28° and high MPA (HMPA) > 28°]. Cephalometric changes of hard and soft tissues were measured and analyzed with an x-y cranial base coordinate system. RESULTS: For CO to EtoE, there were no significant cephalometric changes between HMPA and LMPA, but the horizontal ratio of soft to hard tissue pogonion (H-Pog'/H-Pog) change was significantly greater with LMPA than with HMPA while the vertical ratio (V-Pog'/V-Pog) showed vice versa. For CO to EtoE, MPA showed significant correlations with H-Pog'/H-Pog and V-Pog'/V-Pog. Y-axis angle, V-Pog'/V-Pog and H-Pog'/H-Pog can be used as good tools to discriminate between HMPA and LMPA. CONCLUSION: Cephalometric findings for CO to EtoE may be useful in predicting the vertical and horizontal changes of hard and soft tissues with the treatment of growing adolescents having various vertical skeletal patterns of Class II malocclusion.


Asunto(s)
Reposicionamiento de Medicamentos , Maloclusión de Angle Clase II , Adolescente , Cefalometría , Estudios Transversales , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Mandíbula/diagnóstico por imagen , Pronóstico
18.
Orthod Fr ; 91(1-2): 101-114, 2020 06 01.
Artículo en Francés | MEDLINE | ID: mdl-33146125

RESUMEN

We could study Cone Beam documents of patients consulting in ORL with standard Angle Class I occlusion (45 ND), patients consulting in orthodontics with an orthodontic Class II (51 APNS) and patients with a surgical Class II (83 APS). The used 3D biometry calculates systematically a 164 set of parameters able to take into account all kinds of disharmonies; among which 38 parameters are specifically devoted to anterior-posterior "off asymmetry" pathologies. Then the specific Artificial Intelligence (AI) programs treat morphological data and give textual diagnoses. Analysis of the global sample aims to control the efficiency, separating different sub-samples one each other: t test appreciates efficiency of each parameter to recognize clinical sub-sample. The correlation coefficient, r, between each parameter and pseudo Angle molars Class II (GMMy-Gmmy) give the importance of its tie with Class II pathology. Presentation of parameters medium values in each sub-group gives the medium profiles. By direct comparison of patient's parameters values with medium profile, it is possible to locate patient's pathology. So we can take in account new parameters like arches upper/lower gap, anterior bases upper/lower gap, compensatingparameters... It is then possible to make more secure the clinical decision.


Asunto(s)
Inteligencia Artificial , Maloclusión de Angle Clase II , Biometría , Cefalometría , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Cráneo
19.
Am J Orthod Dentofacial Orthop ; 158(5): 684-693, 2020 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-33010980

RESUMEN

INTRODUCTION: This retrospective pilot study assessed the pre- and posttreatment lip profile changes among adult patients with Class II Division 1 malocclusion of varied growth patterns and compared these changes with patients with a skeletal Class I relationship, to identify the dental, skeletal, and soft tissue cephalometric variables that altered the posttreatment lip profile. METHODS: A total of 33 digital cephalograms were divided into 4 study groups based on the mandibular plane (Mp-SN) angle: group 1 (control, skeletal Class I; mean angle = 21.5°) (n = 8), group 2 (Class II Division 1 malocclusion; low angle = <26°) (n = 8), group 3 (Class II Division 1 malocclusion; intermediate angle = 26°-38°) (n = 9), and group 4 (Class II Division 1 malocclusion; high angle = >38°) (n = 8). RESULTS: We observed a significant decrease in SNA, ANB, maxillary incisor to NA (degrees and millimeters), and soft tissue parameters, especially lip strain and lower lip to E line and upper lip to E line. Posttreatment intergroup comparison showed a significant increase of Mp-SN, and this increase was greater in group 3, followed by group 4 as compared with group 1. In addition, statistically significant differences in SNA, ANB, mandibular incisor to NB (degrees) and IMPA, and H angle in groups 2-4 were observed. CONCLUSIONS: Patients with Class II Division 1 malocclusion showed a significant decrease in SNA, ANB, maxillary incisor to NA, and all soft tissue parameters in posttreatment compared with group 1. Thus, the soft tissue changes resulted in a similar profile to patients in group 1, who are considered to have an aesthetically pleasing posttreatment profile.


Asunto(s)
Labio , Maloclusión de Angle Clase II , Adulto , Diente Premolar/cirugía , Cefalometría , Humanos , Labio/anatomía & histología , Labio/diagnóstico por imagen , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Proyectos Piloto , Estudios Retrospectivos
20.
Shanghai Kou Qiang Yi Xue ; 29(3): 281-286, 2020 Jun.
Artículo en Chino | MEDLINE | ID: mdl-33043345

RESUMEN

PURPOSE: To investigate the effect of extraction on condylar process position and upper airway in 12-14 years old females with skeletal ClassⅡhigh angle. METHODS: Twenty seven 12-14 years old females with skeletal ClassⅡhigh angle (experimental group) and 30 physical examinees without malocclusion (control group) in Stomatology Hospital Affiliated to Southwest Medical University from January 2016 and June 2017 were enrolled. All patients received cone-beam CT (CBCT) examinations. Mimics 20.0 was used to process the data. The changes of the condylar process position and upper airway were recorded. The data were analyzed using SPSS 20.0 software package. RESULTS: Before treatment, patients in the experimental group had higher Sa as well as lower Sp than those of the control group (P<0.05), but with no difference in Su between 2 groups before treatment (P>0.05). After treatment, Sa was decreased in the experimental group (P<0.05), but no change was observed in Sp and Su(P>0.05). After treatment, the joint space indexes were increased in the experimental group (P<0.05). Before treatment, the V total, V tongue, V mouth, and SMIN in the experimental group were significantly lower than those of the control group (P<0.05). Before treatment, V nose, V palate, V larynx, APTE, APHP and APSP in the experimental group showed no difference with those of the control group (P>0.05). V nose, V larynx, APHP and APTE showed no difference before and after treatment within the experimental group (P>0.05). After treatment, the V total, V tongue, V palate, V mouth, SMIN and APSP in the experimental group were significantly increased (P<0.05). CONCLUSIONS: Extraction treatment can widen the airway, suggesting that there may be a certain correlation between the changes of condyle position and upper airway volume.


Asunto(s)
Laringe , Maloclusión de Angle Clase II , Maloclusión , Adolescente , Niño , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Maloclusión de Angle Clase II/diagnóstico por imagen , Maloclusión de Angle Clase II/terapia , Boca
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