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1.
Prog Orthod ; 21(1): 11, 2020 May 04.
Artigo em Inglês | MEDLINE | ID: mdl-32363550

RESUMO

BACKGROUND: To compare dentoskeletal changes produced by the maxillary splint headgear and cervical headgear appliance during the early phase of Class II treatment, specially the initial overjet and upper incisors position. SUBJECTS AND METHODS: In this retrospective study, 28 Class II patients treated with the maxillary splint headgear (MSG, mean age 10.1 ± 1.9 years) and 28 Class II patients treated with cervical headgear (CHG, mean age 9.5 ± 1.9 years) were evaluated before and after treatment. Statistical comparisons between the two groups for cephalometric measurements at T1 and for T2-T1 changes were performed by means of independent sample t tests. RESULTS: The MSG showed a significantly greater reduction of the overjet in comparison to the CHG (- 2.4 mm and - 0.7 mm, respectively) and a significantly greater maxillary incisor uprighting (- 1.8 mm and 0.4 mm, respectively). In the MSG, overjet correction was due mainly to mandibular advancement (3.5 mm), while the correction of molar relationship (3.9 mm) was 64% skeletal and 36% dentoalveolar. In the CHG, the overjet correction was also more skeletal, due to mandibular growth (1.8 mm), while correction of molar relationship (3.5 mm) was 63% dentoalveolar and 37% skeletal. CONCLUSIONS: Both groups showed favorable skeletal mandibular changes, which was more significant in the MSG. Regarding tooth movement, the maxillary splint headgear was more effective in uprighting upper incisors and reducing the overjet than cervical headgear appliance.


Assuntos
Aparelhos de Tração Extrabucal , Má Oclusão de Angle Classe II , Cefalometria , Criança , Humanos , Maxila , Estudos Retrospectivos , Contenções , Técnicas de Movimentação Dentária
2.
Prog Orthod ; 21(1): 13, 2020 May 18.
Artigo em Inglês | MEDLINE | ID: mdl-32419086

RESUMO

BACKGROUND: There is relatively little appreciation of the changes in maxillary-mandibular relationships occurring during adolescence among subjects with normal and increased overjet. The aim of this study was to assess differences in changes in maxillo-mandibular relationships during the adolescent growth period based on the presence of a normal (< 4 mm) or increased (> 4 mm) overjet in childhood. Our hypothesis was that there is no difference in the change of the A point, nasion, B point (ANB) angle during growth between these two overjet groups. Lateral cephalograms were obtained from 65 subjects taken from the American Association of Orthodontists Foundation (AAOF) Craniofacial Growth Legacy Collections Project. Cephalograms were obtained at ages 7-10 (T0) and 14-17 (T1) with allocation into two groups based on baseline overjet (> 4 mm: group 1, 2-4 mm: group 2). Random effects linear regression was used to account for multiple within -patient measurements with dependent variables including antero-posterior skeletal pattern (based on sella, nasion, A point (SNA); sella, nasion, B point (SNB); and ANB angles). RESULTS: We included a similar number of males (n = 34; 52.3%) and females (n = 31; 47.7%). The mean ANB was higher at baseline in group 1 (5.42, SD 2.16°) than in group 2 (3.08, SD 1.91°). The hypothesis was rejected as the ANB angle reduced by 1.92° more in the larger overjet group with the association being statistically significant after accounting for age and gender (P < 0.001; 95% CI 1.06 to 2.77). No significant gender-related effect (P = 0.624; 95% CI - 0.637 to 1.07) was observed overall. However, there was no significant increase in SNA angle in the > 4 mm overjet group compared to the 2-4 mm group (0.857°, P = 0.271; 95% CI - 0.669 to 2.383). The SNB angle increased by 1.15° more in the higher overjet group but there was only weak evidence of an association (P = 0.086; 95% CI - 2.464 to 0.164). CONCLUSIONS: A slight straightening of the facial profile was observed in both groups with a statistically significant greater reduction in ANB arising in the group with larger baseline overjet. This translated into a marginal reduction in the overjet in this group.


Assuntos
Má Oclusão de Angle Classe II , Sobremordida , Adolescente , Cefalometria , Criança , Feminino , Humanos , Masculino , Mandíbula , Maxila
3.
J Forensic Odontostomatol ; 1(38): 8-17, 2020 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-32420908

RESUMO

Sex determination, which is based on the existence of dimorphism between specimens of the same species, plays an important role in the process of human identification. In the absence of pelvic elements, the skull appears to be the best sex indicator, and can also be submitted to quantitative or metric assessments. Eleven measurements were taken for this study, four in the sagittal plane and seven in the horizontal, in two groups of 186 skulls each, with 101 from males and 85 from females for those of the sagittal plane, and 100 and 86, respectively, for those concerning the horizontal, of subjects aged between 18 and 94 years at the time of death. The sample belongs to the Osteological and Tomographic Biobank Professor Doctor Eduardo Daruge of the Piracicaba Dental School of the University of Campinas. The aim of this research was to establish a reliable method to determine sex and elaborate mathematical prototypes capable of assisting in investigation or identification activities, in a preliminary study. Of the measures implemented (Lambda-Nasion, Lambda-Rhinion, Lambda-Nasospinale, Rhinion-Nasospinale, Zygomaxillare-Zygomaxillare, Lambda-Incisive Foramen, Lambda-Right Zygomaxillare, Lambda-Left Zygomaxillare, Basion-Incisive Foramen, Basion-Right Zygomaxillare and Basion-Left Zygomaxillare), only the Lambda-Nasospinale and Rhinion-Nasospinale in the sagittal plane, and the Zygomaxillare-Zygomaxillare and Lambda-Incisive Foramen in the horizontal plane, were significantly dimorphic. Two predictive mathematical models of sex were conceived for each pair of them: one of logistic regression and another of conditional inference trees, displaying accuracy rates of 78.5% and 77.42%, and of 68.28% and 72.04%, respectively. The authors concluded that there is the possibility to apply the aforementioned data in forensic anthropology as an auxiliary tool in investigation or identification tasks.


Assuntos
Determinação do Sexo pelo Esqueleto , Crânio , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Brasil , Cefalometria , Feminino , Antropologia Forense , Humanos , Masculino , Pessoa de Meia-Idade , Adulto Jovem
4.
J Contemp Dent Pract ; 21(1): 105-112, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-32381810

RESUMO

AIM: To test the hypothesis that skeletal and dentoalveolar effects are both important in skeletal class II malocclusion corrected with the Forsus fatigue-resistant device (FRD). MATERIALS AND METHODS: A total of 35 patients (16 females and 19 males; age 12.0 ± 0.6 years) with skeletal class II malocclusion treated with the Forsus FRD were included. Lateral cephalometric radiographies before and after treatment were collected. Cephalometric analysis and superimpositions were applied. Pancherz's analysis was performed to discover the skeletal and dentoalveolar effects on all patients and 60% contribution was set as a milestone to classify. Statistical comparisons were performed by paired t testing (p < 0.05). RESULTS: The mean treatment period of the Forsus FRD was 6.4 ± 0.2 months. All patients (AG) have been corrected to class I molar relationship in three mechanisms: 15 patients in the skeletal group (SG), 10 patients in the dentoalveolar group (DG), and 10 patients in the skeletal and dentoalveolar group (SDG). Four groups showed a significant change in skeletal sagittal relationship improvement (p < 0.05). The AG, SG, and SDG showed a significant improvement in the growth of the mandible (Co-Go, Go-Pog, and Co-Gn, p < 0.05). The DG showed a significant improvement in the growth of the mandibular body (Go-Pog, p < 0.05). CONCLUSION: Three mechanisms were found in skeletal class II malocclusion corrected with the Forsus FRD. Skeletal and dentoalveolar effects are both important in skeletal class II malocclusion corrected with the Forsus FRD. And skeletal and dentoalveolar effects played differential roles in different cases. CLINICAL SIGNIFICANCE: The mechanism of skeletal class II correction with Forsus FRD may divide into mandibular growth, dentoalveolar effects, and both.


Assuntos
Má Oclusão de Angle Classe II , Aparelhos Ortodônticos Funcionais , Cefalometria , Feminino , Humanos , Masculino , Mandíbula , Radiografia
5.
J Orofac Orthop ; 81(3): 192-208, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32253459

RESUMO

AIM: The aim of this study was to analyze dental and soft tissue profile development in children with normal occlusions to establish age- and gender-specific reference intervals for German children during their active growth period. SUBJECTS AND METHODS: The study group consisted of a sample of 31 untreated Caucasian subjects with normal occlusions. Dental casts were analyzed at four different stages of dentitional development. Extraoral profile photographs were available for 19 subjects at stages T2-T4. In these subjects 11 angular measurements and 14 indices were analyzed. Statistical comparisons of gender-specific differences were performed by Mann-Whitney U tests (p ≤ 0.05). RESULTS: Upper and lower posterior and total arch perimeters were recorded to be significantly larger in male subjects until the late mixed dentition. Subsequently, there was a tendency toward larger dimensions in males for those parameters. Upper and lower intercanine, interpremolar and intermolar widths were significantly larger in males throughout the entire observation period. There were no statistically significant gender differences with regard to most angular measurements in the dental arches, including molar rotation, palatal volume, overbite, overjet and molar relationship at later dental stages. CONCLUSION: In untreated subjects with normal occlusion, dental arch and soft tissue parameters can be considered age-dependent. For some dental parameters, gender-specific differences were found that should be taken into consideration during diagnosis and treatment planning of growing children. The obtained longitudinal data of untreated children provide useful information for orthodontic diagnosis, treatment planning and future research projects.


Assuntos
Arco Dental , Má Oclusão de Angle Classe II , Cefalometria , Criança , Dentição Mista , Humanos , Masculino , Maxila , Dente Molar
6.
Prog Orthod ; 21(1): 9, 2020 Apr 06.
Artigo em Inglês | MEDLINE | ID: mdl-32249341

RESUMO

BACKGROUND: The aim of the present study was to assess if genetic polymorphisms in tooth agenesis (TA)-related genes are associated with craniofacial morphological patterns. METHODS: This cross-sectional, multi-center, genetic study evaluated 594 orthodontic Brazilians patients. The presence or absence of TA was determined by analysis of panoramic radiography. The patients were classified according to their skeletal malocclusion and facial growth pattern by means of digital cephalometric analysis. Genomic DNA was extracted from squamous epithelial cells of buccal mucosa and genetic polymorphisms in MSX1 (rs1042484), PAX9 (rs8004560), TGF-α (rs2902345), FGF3 (rs1893047), FGF10 (rs900379), and FGF13 (rs12838463, rs5931572, and rs5974804) were genotyped by polymerase chain reaction using TaqMan chemistry and end-point analysis. RESULTS: Genotypes (p = 0.038) and allele (p = 0.037) distributions for the FGF3 rs1893047 were significantly different according to the skeletal malocclusion. Carrying at least one G allele increased in more than two times the chance of presenting skeletal class III malocclusion (OR = 2.21, CI 95% = 1.14-4.32; p = 0.017). There was no association between another skeletal craniofacial pattern and some polymorphism assessed in the present study. CONCLUSION: Our results suggest that the genetic polymorphism rs1893047 in FGF3 might contribute to variations in the craniofacial sagittal pattern.


Assuntos
Anodontia , Má Oclusão , Brasil , Cefalometria , Estudos Transversais , Genótipo , Humanos
7.
Compend Contin Educ Dent ; 41(4): 218-223, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32255653

RESUMO

The management of an anterior open bite can be quite challenging and in some cases necessitate a multidisciplinary approach. In this case report, a patient presented with an anterior open bite with an ankylosed central incisor due to previous trauma. The open bite was corrected using conventional orthodontics, and the ankylosed incisor was repositioned in the correct tridimensional position using a segmental osteotomy. The repositioned bone block required 5 months of stabilization, and the prosthetic rehabilitation of the anterior maxilla was completed using lithium-disilicate crowns. At 24 months the outcome was stable with no relapse and had an excellent pink and white esthetic score.


Assuntos
Mordida Aberta , Cefalometria , Estética Dentária , Humanos , Maxila , Osteotomia
8.
J Orofac Orthop ; 81(3): 209-219, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32342120

RESUMO

PURPOSE: The aim of this study was to evaluate the hard and soft tissue effects and differences of the Alt-RAMEC protocol to the facemask and conventional facemask protocols in patients with unilateral cleft lip and palate. METHODS: This prospective study was carried out with 30 patients with unilateral cleft lip and palate with skeletal and dental class III malocclusions who were referred to a university department of orthodontics. The patients were evaluated with the cervical vertebral maturation method and divided into two groups, each consisting of 15 patients. The patients in group I (mean age 10.00 ± 0.73 years) were treated according to conventional facemask protocol, and the patients in group II (mean age 10.07 ± 2.43 years) were treated according to the Alt-RAMEC protocol before facemask application. Lateral cephalometric radiographs were evaluated by using the Dolphin Imaging Software version 11.7. The skeletal, dentoalveolar and soft tissue differences and treatment times were evaluated. RESULTS: Group II demonstrated a 5.73° increase in SNA, which was statistically significant, while this increase was 3.13° in group I (p < 0.001). Results for Co­A and A­PTV showed a significant increase for group II only (group I: 1.02 mm, 1.06 mm, group II: 3.02 mm, 2.21 mm; p < 0.05 and p < 0.01, respectively). In addition, group II presented significant increase for the values of ANB, N­A-Pg, SN/MP, Wits, U1-SN, U1-L1, U1-PTV, U1-FHP, U6-PTV, U6-FHP, overjet, Ss-PTV, UL-PTV and UL­S line (p < 0.001). The treatment mean times were 7.3 months in group I and 4.7 months in group II (p < 0.01). CONCLUSION: Applying the facemask after having followed the Alt-RAMEC protocol induced more skeletal, dentoalveolar and soft tissue changes in comparison to the conventional facemask protocol in patients with unilateral cleft lip and palate.


Assuntos
Fenda Labial , Fissura Palatina , Má Oclusão de Angle Classe III , Cefalometria , Criança , Aparelhos de Tração Extrabucal , Humanos , Maxila , Técnica de Expansão Palatina , Estudos Prospectivos
9.
Zhonghua Er Ke Za Zhi ; 58(4): 290-294, 2020 Apr 02.
Artigo em Chinês | MEDLINE | ID: mdl-32234135

RESUMO

Objective: To explore the reference ranges and influential factors of disturbance coefficient (DC) in children without craniocerebral injury at different ages. Methods: Two hundred children without craniocerebral injury admitted to the Department of Orthopaedics in Children's Hospital of Chongqing Medical University from May 2018 to October 2019 were enrolled in this prospective study. The children were divided into four groups according to age, 0-1 year, >1-3 years, >3-5 years and >5-16 years, each of which included 50 children. Each child had DC measured twice with the non-invasive dynamic cerebral edema monitor, and the average value was used as the terminal DC value. Each measurement lasted 15 minutes, 12 hours apart. The difference of DC values among the four groups and between different genders were compared with ANOVA test and nonparametric test. And the Loess local weighted nonparametric regression analysis was used to explore the change of DC according to the increase of age, weight and head circumference (HC). Results: The reference values of DC for children of 0-1 year,>1-3 years, >3-5 years, and >5-16 years were 60±14, 92±18, 112±18, 135±18, respectively (F=175.690, P<0.01). There was no statistical significance in DC between male and female children either in the whole or in each separate age group (103 (81, 125) vs. 102 (68, 123) , Z=-0.739, P=0.460; 59 (52, 68) vs. 57 (53, 65) , Z=-0.243, P=0.808; 88 (81, 105) vs. 95 (70, 105) , Z=-0.776, P=0.437; 117 (99, 120) vs. 113 (101, 123) , Z=-0.170, P=0.865; 137 (123, 143) vs. 142 (123, 160) , Z=-1.279, P=0.201). When the child's age was younger than 5 years, weight was less than 18 kg or HC was less than 51 cm, the DC increased significantly with the increase of age, weight or HC. However, when the age, weight and HC were over the above values, the DC did not show obvious increase, but approaching to stable values of 135, 130, and 130, respectively. Conclusions: For children without craniocerebral injury, the reference values of DC are obviously different at different ages. DC is positively related to age, weight and HC, but not related to gender.


Assuntos
Cefalometria , Adolescente , Criança , Pré-Escolar , Traumatismos Craniocerebrais , Edema/diagnóstico , Feminino , Cabeça/anatomia & histologia , Hospitalização , Hospitais Pediátricos , Humanos , Lactente , Recém-Nascido , Masculino , Estudos Prospectivos
10.
J Appl Oral Sci ; 28: e20190364, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32348442

RESUMO

Objective Maxillary molar distalization with intraoral distalizer appliances is a non-extraction orthodontic treatment used to correct molar relationship in patients with Class II malocclusion presenting maxillary dentoalveolar protrusion and minor skeletal discrepancies. This study compares the changes caused by three distalizers with different force systems. Methodology 71 patients, divided into three groups, were included. The Jones jig group (JJG, n=30; 16 male, 14 female, 13.17 years mean age) was treated with the Jones jig for 0.8 years. The Distal jet group (DJG, n=25; 8 male, 17 female, 12.57 years mean age) was treated with the Distal jet for 1.06 years. The First Class group (FCG, n=16; 6 male, 10 female, 12.84 years mean age) was treated with the First Class for 0.69 years. Intergroup treatment changes were compared using one-way ANOVA, followed by post-hoc Tukey's tests. Results Intergroup comparisons showed significantly greater maxillary incisor protrusion in DJG than in FCG (2.56±2.24 mm vs. 0.74±1.39mm, p=0.015). The maxillary first premolars showed progressive and significantly smaller mesial angulation in JJG, FCG and DJG, respectively (14.65±6.31º, 8.43±3.99º, 0.97±3.16º; p<0.001). They also showed greater mesialization in JJG than FCG (3.76±1.46 mm vs. 2.27±1.47 mm, p=0.010), and greater extrusion in DJG compared to JJG (0.90±0.77 mm vs 0.11±0.60 mm, p=0.004). The maxillary second premolars showed progressive and significantly smaller mesial angulation and mesialization in JJG, FCG and DJG, respectively (12.77±5.78º, 3.20±3.94º, -2.12±3.71º and 3.87±1.34 mm, 2.25±1.40 mm, 1.24±1.26 mm, respectively; p<0.001). DJG showed smaller distal angulation of maxillary first molars (-2.14±5.09º vs. -7.73±4.28º and -6.05±3.76º, for the JJG and FCG, respectively; p<0.001) and greater maxillary second molars extrusion (1.17±1.41 mm vs -0.02±1.16 mm and 0.16±1.40 mm, for the JJG and FCG, respectively; p=0.003). Overjet change was significantly larger in DJG compared to FCG (1.79±1.67 mm vs 0.68±0.84; p=0.046). Treatment time was smaller in FCG (0.69±0.22 years vs 0.81±0.33 years and 1.06±0.42 years, comparing it with the JJG and DJG, respectively; p=0.005). Conclusion The three appliances corrected the Class II molar relationship by dentoalveolar changes. The Distal jet produced smaller molar distal angulation than the Jones jig and First Class. The First Class appliance showed less anchorage loss, greater percentage of distalization and shorter treatment time than the Jones jig and Distal jet.


Assuntos
Má Oclusão de Angle Classe II/terapia , Dente Molar/fisiopatologia , Desenho de Aparelho Ortodôntico , Aparelhos Ortodônticos Fixos , Técnicas de Movimentação Dentária/instrumentação , Adolescente , Análise de Variância , Cefalometria , Criança , Feminino , Humanos , Masculino , Má Oclusão de Angle Classe II/fisiopatologia , Procedimentos de Ancoragem Ortodôntica/instrumentação , Valores de Referência , Reprodutibilidade dos Testes , Estudos Retrospectivos , Resultado do Tratamento
11.
J Appl Oral Sci ; 28: e20190399, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32348443

RESUMO

Objectives To evaluate the acoustic properties of the /s/ sound in individuals with different occlusion types and to investigate relationships between these properties and cephalometric measurements. Methodology Sixty patients were divided into three groups based on malocclusion. Group 1 included 20 patients (mean age: 14.85±2.01 years) with Class I skeletal and dental relationships. Group 2 included 20 patients (mean age: 13.49±1.78 years) with Class II skeletal and dental relationships. Group 3 included 20 patients (mean age: 12.46±2.62 years) with Class III skeletal and dental relationships. Cephalometric tracings were obtained from cephalometric radiographs. All included patients were native speakers of Turkish. The /s/ sound was selected for center of gravity analysis. Correlations between cephalometric values and acoustic parameters were also investigated. Results The center of gravity of the /s/ sound had the lowest value in Group 2 (p<0.05). For the /s/ sound in Group 3, moderate positive correlations were found between center of gravity and Sella-Nasion to Gonion-Gnathion angle (p<0.05, r=0.444) Lower incisor to Nasion-B point (p<0.023, r=0.505), and Lower incisor to Nasion-B point angle (p<0.034; r=0.476). No correlation was found in other cephalometric measurements. Conclusions The /s/ sound was affected by malocclusion due to the changing place of articulation. Therefore, referral to an orthodontist for malocclusion treatment especially patients with class III in the early period is suggested for producing acoustically ideal sound.


Assuntos
Cefalometria , Má Oclusão/fisiopatologia , Acústica da Fala , Distúrbios da Fala/fisiopatologia , Adolescente , Criança , Feminino , Humanos , Masculino , Má Oclusão/complicações , Má Oclusão/diagnóstico por imagem , Mandíbula/anatomia & histologia , Mandíbula/fisiopatologia , Maxila/anatomia & histologia , Maxila/fisiopatologia , Estudos Prospectivos , Radiografia , Valores de Referência , Distúrbios da Fala/diagnóstico por imagem , Distúrbios da Fala/etiologia , Estatísticas não Paramétricas , Língua/anatomia & histologia , Língua/fisiopatologia , Turquia
12.
J Orofac Orthop ; 81(3): 183-191, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32125437

RESUMO

PURPOSE: The aim of this study was to investigate the possible correlation between maxillary and mandibular positioning via cephalometric analysis with pterygomaxillary fissure (PMF) morphology using cone beam computed tomography (CBCT). METHODS: In this study, CBCT images from 825 individuals (448 female, 377 male; age range was 18-91 years with this cohort) were analyzed; PMF length and width were measured. Three-dimensional cephalometric analysis was also performed using cephalometric analysis software. The landmarks and measurements in relation to maxillary and mandibular positions were identified and performed for the cephalometric analysis. Analysis of variance (ANOVA) was used for comparison of the parameters, while the Bonferroni test was used for multiple comparisons. Pearson's test was also used to assess the correlations between the parameters. RESULTS: The results showed that males had significantly larger PMF length (p < 0.001) and width (p < 0.001) compared to females. The mean PMF length was 17.7 mm (standard deviation [SD] 3.2 mm) for right and 17.7 mm (SD 3.3 mm) for left but were not significantly different (p > 0.05). In terms of the cephalometric measurements, a significant correlation was found between upper central incisor (U1toAperp2D) and posterior facial height (PostFaceHtSGo2D) and PMF length, while correlations were found between PMF width and several cephalometric parameters such as lower lip (LwLiptoEPln2D and LwLiptoHLine2D) and occlusal plane (OPtoFHAng2D) (p < 0.05). CONCLUSION: A significant relationship was observed between PMF morphology and the position of the maxilla or mandible. PMF lengths and widths were larger in males than females. Posteroanterior maxillary and mandibular lengths and posterior facial height are associated with PMF length and width.


Assuntos
Tomografia Computadorizada de Feixe Cônico , Maxila , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Cefalometria , Feminino , Humanos , Incisivo , Masculino , Mandíbula , Pessoa de Meia-Idade , Adulto Jovem
13.
Am J Orthod Dentofacial Orthop ; 157(3): 305-312, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32115108

RESUMO

INTRODUCTION: The cervical vertebral maturation (CVM) method comprises 6 stages reported to be prepubertal (1 and 2), pubertal (3 and 4) and postpubertal (5 and 6), and its use has been recommended for planning treatment timing in orthodontics. Reliable use of the method implies that pubertal stages have to mature into postpubertal as soon as the growth peak is terminated. The present study was aimed at determining whether postpubertal CVM stages 5 or 6 are attained in all subjects. METHODS: A total of 450 adult subjects (270 females and 180 males; mean age, 30.4 ± 27.3 years; range, 20-45 years) seeking orthodontic treatment and having a lateral head film were included in the study. Customized cephalometric analysis was used, and each recording was converted into an individual CVM code according to the concavities of the C2 to C4 and shapes of C3 and C4. The retrieved CVM codes, either falling within the reported norms (regular cases) or not (exception cases), were also converted into the CVM stages and a newly introduced CVM score (0-9) capable of defining intermediate stage. RESULTS: The most frequent CVM stage was 5, while the CVM stage 6 was attained in only one third of the sample. Up to about 11% of adult subjects showed the pubertal CVM stage 4. Irrespective of the CVM stage or CVM score, no significant differences were seen between the sexes or across ages. The C4 showed a rectangular vertical shape in only 16.4% of the cases. CONCLUSIONS: The percentage of adult population maintaining a pubertal CVM stage 4 is not high, but still relevant from a clinical standpoint. In light of this finding, planning treatment timing-based only on CVM appears not fully reliable.


Assuntos
Determinação da Idade pelo Esqueleto , Vértebras Cervicais , Ortodontia , Cefalometria , Vértebras Cervicais/crescimento & desenvolvimento , Feminino , Humanos , Masculino
14.
Am J Orthod Dentofacial Orthop ; 157(3): 329-339, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32115111

RESUMO

INTRODUCTION: The purpose of this study was to comparatively evaluate the effects of Twin-block (TB) appliance and sagittal-guidance Twin-block (SGTB) appliance on alveolar bone around mandibular incisors in growing patients with Class II Division 1 malocclusion, using cone-beam computed tomography. METHODS: The sample consisted of 25 growing patients with Class II Division 1 malocclusion (14 boys and 11 girls, mean age 11.92 ± 1.62 years) and was randomly distributed into the TB group (n = 13) and the SGTB group (n = 12). The treatment duration was 11.56 ± 1.73 months. Pretreatment (T1) and posttreatment (T2) cone-beam computed tomography scans were taken in both groups. Height, thickness at apex level, and volume of the alveolar bone around mandibular left central incisors were measured respectively on labial and lingual side, using Mimics software (version 19.0; Materialise, Leuven, Belgium). Based on the stable structures, 3-dimensional (3D) registrations of T1 and T2 models were taken to measure the sagittal displacement of incisors. Intragroup comparisons were evaluated by paired-samples t tests and Wilcoxon tests. Independent-samples t tests and Mann-Whitney U tests were used for intergroup comparisons. RESULTS: In both groups, alveolar bone height and volume on the labial side of the incisors significantly decreased after treatment (P <0.05). Lingual alveolar bone height, lingual and total alveolar bone volume, labial, lingual and total alveolar bone thickness showed no significant difference between T1 and T2 (P >0.05). In both groups the incisors tipped labially and drifted to the labial side. Compared with the TB group, less labial alveolar bone loss, less incisor proclination and crown edge drift were found in the SGTB group (P <0.05). CONCLUSIONS: Labial alveolar bone loss around mandibular incisors was observed after both types of appliances treatment in growing patients with Class II Division 1 malocclusion. Less labial alveolar bone loss, less incisor proclination, and crown edge drift were found in the SGTB group than in the TB group during treatment.


Assuntos
Perda do Osso Alveolar , Má Oclusão de Angle Classe II , Aparelhos Ortodônticos , Adolescente , Cefalometria , Criança , Tomografia Computadorizada de Feixe Cônico , Feminino , Humanos , Incisivo , Masculino , Má Oclusão de Angle Classe II/diagnóstico por imagem , Má Oclusão de Angle Classe II/terapia , Mandíbula , Coroa do Dente
15.
Am J Orthod Dentofacial Orthop ; 157(3): 365-376, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32115115

RESUMO

INTRODUCTION: Currently, a standard of reference for longitudinal facial growth parameters for South American mestizos is lacking. Therefore, in this study, we describe an 18-year follow-up of craniofacial growth from 6 to 24 years of age in a Colombian mestizo population, and an analysis of facial growth beyond 18 years of age. METHODS: This 18-year follow-up longitudinal study was conducted in Medellín, Colombia. The study sample consisted of 49 mestizo subjects with normal facial features and no history of orthodontic treatment. Measurements of cranial base length, maxillary and mandibular length, posterior and anterior facial height, lower anterior facial height, and mandibular plane angle were documented at an X-ray magnification of 10%. Data were subjected to linear mixed model analysis. RESULTS: Changes in cephalometric measurements were detected during the 18-year follow-up and were significantly affected by age and sex. Pubertal growth spurts were between 12 and 14 years for females, and between 14 and 16 years of age for males. Mandibular plane angle decreased in both females and males during the 18-year follow-up. CONCLUSIONS: Age and sex significantly affect craniofacial growth in mestizos in Columbia. Beyond 18 years of age, craniofacial growth is important. Our data do not support sexual dimorphism in mandibular rotation in young adults.


Assuntos
Face , Mandíbula , Desenvolvimento Maxilofacial , Adolescente , Cefalometria , Criança , Colômbia , Feminino , Seguimentos , Humanos , Estudos Longitudinais , Masculino , Adulto Jovem
16.
Stomatologiia (Mosk) ; 99(1): 49-54, 2020.
Artigo em Russo | MEDLINE | ID: mdl-32125302

RESUMO

AIM: To analyze the effect of the Frankel-2 activator on the sagital maxillomandibular ratio during the treatment of distal malocclusion. MATERIAL AND METHODS: 51 patients with skeletal distal malocclusion were examined. 24 patients belong to the main group treated with Frankel-2 activator, and 27 belong to the control group that did not receive treatment. Patients age 10-14, the duration of treatment was 1.5-2 years. To estimate changes of the maxillomandibular ratio in patients before and after treatment, in the control group were analyzed lateral cephalometric X-rays with interval of two years. RESULTS: The growth of the maxilla (ANS-PNS) in the main group was less than in the control group. The SNA angle showed similar changes in both groups. Co-Gn distance indexes were also close in both groups. In the SNB angle, the jaw in the main group was moved forward. The angle of ANB and the size of WITS in the control group are not changed, and in the main group were decreased and normalized. In contradistinction to the control group, in the main group in the upper incisors occurred retrusion and this affects the upper lip. The overjet distance in the control group was not changed, while in the main group decreased and normalized. CONCLUSION: During the treatment of distal malocclusion by the Frankel-2 activator there is a delay in the growth of the maxilla in the saggital direction, movement of the mandibula forward, and improvement in the sagittal ratio between the maxilla and the mandibula.


Assuntos
Má Oclusão de Angle Classe II , Má Oclusão , Cefalometria , Humanos , Incisivo , Mandíbula , Maxila
17.
J Indian Soc Pedod Prev Dent ; 38(1): 88-90, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32174635

RESUMO

One of the most common clinical challenges encountered with facemask therapy for early correction of skeletal Class III malocclusions is the delivery of appropriate direction of force for effecting the pure translation of maxilla. This technical note describes a novel method involving the use of Begg's auxiliary for achieving efficient and predictable delivery of protraction forces. With this modified assembly, effective vector control for facemask can be achieved without the need to remove the bonded Hyrax assembly. This chairside modification is an effective and invaluable method for predictable force delivery in facemask therapy.


Assuntos
Má Oclusão de Angle Classe III , Técnica de Expansão Palatina , Cefalometria , Aparelhos de Tração Extrabucal , Humanos , Maxila
18.
Dental Press J Orthod ; 25(1): 36-46, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32215476

RESUMO

INTRODUCTION: Tooth agenesis is one of the most common dental anomalies; however, the concomitant occurrence of opposite dental numerical variation of hypohyperdontia is extremely rare. OBJECTIVE: To report the successful orthodontic management of a patient with non-syndromic concomitant bilateral agenesis of mandibular canines and two midline inverted supernumerary maxillary teeth. CASE REPORT: 21-year-old female patient with a chief complaint of protrusive right maxillary central incisor. The patient was diagnosed with a mild Class II skeletal base, Angle Class III molar relationship and increased overjet associated with hypohyperdontia. Anterior open bite accompanied with tongue-thrusting habit were also observed. Two temporary anchorage devices (TADs) were implanted at the buccal side of the maxillary molar region to control vertical height. Anterior teeth retraction was done after extraction of the maxillary first premolars, to improve the excessive overjet. The treatment mechanics involved lingual brackets system for the maxillary arch and transpalatal arch for anchorage control. RESULTS: The total active treatment period was 35 months. Acceptable occlusion with increased bite force and contact area as well as functional excursion were established without interference, following complex orthodontic treatment with premolar substitution. The resultant occlusion and a satisfactory facial profile were maintained after 29 months of retention. CONCLUSION: The present case report provides implications regarding the orthodontic treatment of hypohyperdontia-associated substitution for missing teeth as an effective option for improving aesthetic and functional aspects.


Assuntos
Má Oclusão de Angle Classe II , Procedimentos de Ancoragem Ortodôntica , Adulto , Cefalometria , Estética Dentária , Feminino , Humanos , Técnicas de Movimentação Dentária , Adulto Jovem
19.
Eur J Paediatr Dent ; 21(1): 39-45, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32183527

RESUMO

AIM: As the effects of infraocclusion on mandibular growth could have a significant impact on the treatment planning made by the orthodontist, the aim of this study is to evaluate the correlation between infraocclusion and mandibular growth. MATERIALS AND METHODS: Study design: A total of 42 healthy Caucasian patients with no history of dental trauma or orthodontic treatment were selected for this study from the same paediatric dentistry department. These patients were divided in two groups based on the presence or absence of infraocclusion: Group A, 22 patients (12 males and 10 females) suffering from infraocclusion of at least one inferior deciduous molar, and Group B, 20 patients (9 males and 11 females) who did not suffer from infraocclusion but had to be treated for dental overcrowding. Each patient was examined through an orthopantomography scan and lateral cephalogram. All measurements were made before the start of the treatment, and they were analysed in order to show cephalometric correlation between the skeletal class, the vertical dimension and cranio-maxillo-mandibular divergence. RESULTS: According to Student's t-test, the only measurements which had a statistically significant difference between Group A and Group B were the SNB angle (p-value <0.01), the ANB angle (p-value <0.05) and the PC-GO-GN angle (p-value <0.05). CONCLUSION: From the data collected in this study, it is possible to conclude that patients suffering from infraocclusion of the mandibular deciduous molars show mandibular post-rotation and an increased total Gonial angle, compared to patients who do not suffer from infraocclusion. Despite the absence of a longer-term evaluation of these patients, thanks to this data it is possible to state that early diagnosis of infraocclusion is fundamental in order to apply a well-planned and thought-out orthodontic treatment.


Assuntos
Má Oclusão , Dente Decíduo , Estudos de Casos e Controles , Cefalometria , Criança , Feminino , Humanos , Masculino , Mandíbula , Dente Molar
20.
Eur J Paediatr Dent ; 21(1): 46-52, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32183528

RESUMO

AIM: It has been suggested that atypical swallowing (AS) may negatively influence the skeletal and alveolar development, but its specific effects are still unclear. The aim of this work is to compare the cephalometric characteristics of children and adolescents with and without AS. MATERIALS AND METHODS: Study design: Case-control retrospective cross-sectional study. One hundred patients with (AS group) and 100 patients without AS (control group, C) were retrospectively selected. Their cephalometric data before orthodontic treatment were compared using a 3-way ANOVA variance test to detect any differences between groups considering: the type of swallowing (AS vs C); whether or not the second dentition was completed (SDC vs SDNC); and the gender (males-M and females-F). In addition, a Student-t test for unpaired data was carried out to detect differences between M and F within the AS and C groups. RESULTS: When compared to the controls, AS patients showed a significantly decreased SNB angle (p<.01), increased ANB and SN^Go. Me angles (p<.0001), increased overjet and lower facial height (p<.01), decreased overbite (p<.0001), and increased proclination of the upper incisors. AS-SDC patients also showed significantly increased alveolar length. Within the AS and C groups, skeletal and alveolar measurements were larger in males, with higher significance in the C group, suggesting a different trend of growth in AS patients. CONCLUSION: AS seems to affect the skeletal growth causing mandibular clockwise rotation, skeletal Class II, open bite and incisor proclination. To compensate for these effects, an increase in alveolar growth together with molar eruption seems to be induced.


Assuntos
Deglutição , Má Oclusão de Angle Classe II , Adolescente , Cefalometria , Criança , Estudos Transversais , Feminino , Humanos , Masculino , Mandíbula , Maxila , Estudos Retrospectivos
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