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1.
Angle Orthod ; 90(5): 707-714, 2020 09 01.
Artículo en Inglés | MEDLINE | ID: mdl-33378480

RESUMEN

OBJECTIVE: To evaluate and compare articular disk position, condylar position, and joint spaces in Class II vertical, Class II horizontal, and Class I cases. The purpose was to assess the potential for development of temporomandibular disorders (TMDs) in the three groups. MATERIALS AND METHODS: A sample of 75 cases, 25 cases in each group of Class I, Class II vertical, and Class II horizontal, were selected based on inclusion and exclusion criteria. Magnetic resonance imaging (MRI) assessments were made with a 1.5-Tesla basic system with a closed-mouth technique for evaluating articular disk position in the sagittal and transverse planes, condylar position, and joint spaces in the sagittal plane. Philips 3.0 software was used to analyze the MR images. RESULTS: There was evidence of alterations in the temporomandibular joint (TMJ) morphology in both Class II vertical and Class II horizontal cases, with maximum discrepancy in Class II vertical cases. MRI evaluation suggested a tendency for antero-medial disk displacement with anteriorly positioned condyles in Class II vertical cases. The discrepancy was milder in the Class II horizontal group. CONCLUSIONS: Class II vertical cases are more susceptible to the development of TMDs and should be subjected to TMJ evaluation before starting any orthodontic treatment to intercept and prevent a mild asymptomatic TMD from developing into a more severe form. Class II vertical cases should be subjected to MRI evaluation before starting any orthodontic treatment.


Asunto(s)
Luxaciones Articulares , Maloclusión de Angle Clase I , Trastornos de la Articulación Temporomandibular , Humanos , Imagen por Resonancia Magnética , Cóndilo Mandibular/diagnóstico por imagen , Articulación Temporomandibular/diagnóstico por imagen , Disco de la Articulación Temporomandibular/diagnóstico por imagen , Trastornos de la Articulación Temporomandibular/diagnóstico por imagen
2.
Rev. Cient. CRO-RJ (Online) ; 5(1): 80-86, Jan.-Apr. 2020.
Artículo en Inglés | LILACS, BBO - Odontología | ID: biblio-1139967

RESUMEN

This case report describes an interceptive treatment of anterior open bite (AOB) with fixed palatine grid using clinical, cephalometric, electromyographic and speech analysis data. Case report: An 8-year-old girl, Angle Class I malocclusion presenting AOB. The complete orthodontic documentation was obtained and the perioral muscles were evaluated using the electromyography during blowing, sucking and smiling activities, before and after treatment. Speech acoustic evaluation was performed through the frequencies of the formants to assess the position of the tongue. Results: The AOB was corrected in six months with reduction of vertical transpass, decrease of cephalometric Angles 1: NA and 1: NB and increase of interincisal angle. During the smile movement, it was possible to observe the decrease of the muscular activity of the superior orbicularis muscle and the increase of the muscular activity of the inferior orbicularis. In the blow movement, there was a tendency to decrease muscle activity. Opposite directions were observed at the time of installation of the grid in the frequencies of the formants. When the grid was removed, the tongue was lowered and posteriorized in relation to the installation time. When compared the final and initial moments, it was noted a predominance of tongue lower position, besides posteriorization in some vowels and anteriorization in others. Conclusion: After the use of the fixed palatine crib as an interceptive treatment for AOB, the bite was closed and it was possible to observe an harmony in the patient profile and improvement in periorbital musculature and tongue positioning.


Objetivo: Este relato de caso descreve um tratamento interceptivo da mordida aberta anterior (MAA) com grade palatina fixa usando dados clínicos, cefalométricos, eletromiográficos e de fala. Relato do caso: Menina de 8 anos de idade apresentando maloclusão Classe I de Angle e MAA. A documentação ortodôntica completa foi obtida e os músculos periorais foram avaliados pela eletromiografia durante as atividades de sopro, sucção e sorriso, antes e após o tratamento. A avaliação acústica da fala foi realizada através das frequências dos formantes para avaliar a posição da língua. Resultados: O MAA foi corrigida em seis meses com redução do transpasse vertical, diminuição dos ângulos cefalométricos 1: NA e 1: NB e aumento do ângulo interincisivo. Durante o movimento do sorriso, foi possível observar a diminuição da atividade muscular do músculo orbicular superior e o aumento da atividade muscular do orbicular inferior. No movimento do sopro, houve uma tendência a diminuir a atividade muscular. Direções opostas foram observadas no momento da instalação da grade nas frequências dos formantes. Quando a grade foi removida, a língua foi abaixada e posteriorizada em relação ao tempo de instalação inicial do aparelho. Quando comparados os momentos final e inicial, observou-se predomínio da posição inferior da língua, além de posteriorização em algumas vogais e anteriorização em outras. Conclusão: Após o uso da grade palatina fixa como tratamento interceptivo para a MAA, a mordida foi fechada e foi possível observar harmonia no perfil da paciente e melhora da musculatura periorbital e posicionamento da língua.


Asunto(s)
Mordida Abierta , Enfermedades Dentales , Enfermedades Estomatognáticas , Niño , Maloclusión de Angle Clase I
3.
Indian J Dent Res ; 31(3): 363-367, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32769268

RESUMEN

Aim: This study describes the relationship of the chronophysiological organization of the lateral teeth occlusion and the parameters of the chewing unit of the human dentofacial system (bioelectric potentials, the force of the masticatory muscles, masticatory efficiency) which should be considered in modeling of prosthesis occlusal surfaces. Materials and Methods: Examination of 200 respondents with a "day" chronotype, with Angle class I bilateral occlusion at the age of 18-35 years was conducted daily for 3 days. From 8.00 to 20.00, every 4 hours, the amplitude of the electromyography, the jaw muscles' force, the masticatory efficiency, the area of the occlusal contacts, and the near-contact zones were determined. Results: The activity of the masticatory muscles increased during the period from 12.00 to 16.00, which coincided with the escalation of the masticatory efficiency and of the occlusal contacts area. The relationship between the occlusal surfaces' relief and masticatory efficiency is described by two types of occlusal surfaces' topography - smoothed and pronounced, differing by the ratio of the areas of the occlusal contacts and the near-contact zones in 0.25- and 1-mm wide. Conclusion: The modeling of the occlusal surface of the permanent prosthetic restorations for patients with the "day" chronotype should be carried out with the area values of occlusal contacts and near-contact zones corresponding to the period of masticatory muscles activity from 12.00 to 16.00 and in accordance with the characteristic type of the occlusal surfaces' relief.


Asunto(s)
Oclusión Dental , Maloclusión de Angle Clase I , Electromiografía , Humanos , Masticación , Músculos Masticadores
4.
J Contemp Dent Pract ; 21(4): 377-382, 2020 Apr 01.
Artículo en Inglés | MEDLINE | ID: mdl-32584272

RESUMEN

AIM: This study was conducted for evaluating and comparing the mesiodistal width of upper anteriors in different malocclusions and its relation with various arch forms. MATERIALS AND METHODS: In total, 60 subjects with different malocclusions were examined. Mesiodistal width was measured for the anterior teeth using digital vernier caliper. 3M Unitek arch form template and two-dimensional (2D) model were superimposed to find out primarily the relation of arch form in specific malocclusion to the sum the mesiodistal width of the maxillary of anterior teeth and secondarily the relation of sum of the mesiodistal width of the maxillary anterior tooth with different arch forms. RESULTS: The ovoid arch form was common in class I malocclusion with mean mesiodistal width of 50.43 mm. The tapered arch form was the common type in both class II and class III malocclusion with mean mesiodistal width of 49.96 and 45.15 mm, respectively. CONCLUSION: The mean of anterior mesiodistal width for Angle's class III individuals was 45.15 mm considerably less than that of class II subjects and class I subjects, which signifies that the tooth material was more in the anterior region of the subject of class I followed by class II and class III malocclusions. CLINICAL SIGNIFICANCE: The performed study presents various maxillary dental arch forms observed in various malocclusions (Angle's class I, class II, and class III). The ovoid and tapered arch forms exhibited the common occurrence, while the square form was the rarest.


Asunto(s)
Maloclusión de Angle Clase II , Maloclusión de Angle Clase I , Maloclusión , Arco Dental , Humanos , Maxilar , Estudios Retrospectivos
5.
J Craniofac Surg ; 31(5): 1353-1361, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32224775

RESUMEN

INTRODUCTION: In this study, the authors aimed to perform a novel and extensive analysis, based on the most applicable correlations between the mandibular and upper airway parameters, using cone beam computed tomography across all malocclusion classes. The authors also focused on gender-dependent differences in an Iranian population. MATERIALS AND METHODS: Images were acquired from adult patients using cone beam computed tomography. The patients were classified into three groups of malocclusion classes (class I: 13 males and 27 females, class II: 13 males and 27 females, and class III: 25 males and 15 females). For each patient, 10 parameters for the mandible and 23 parameters for the pharynx, pyriform aperture, and nasal cavity were evaluated in the images. RESULTS: Pearson's correlation coefficient showed significant correlations between the mandibular morphology and upper airway dimensions in each malocclusion class. In females, the menton angle had a significant correlation with pharyngeal dimensions in all malocclusion classes. In males, the bigonial width, bicondylar width, and symphyseal height of the mandible were correlated with pharyngeal dimensions in all classes. The greatest correlation between the mandible and upper airways was observed in class III malocclusions, and the lowest correlation was observed in class I malocclusions. In addition, the mandibular parameters had relationships with the nasal cavity and pyriform aperture. CONCLUSION: It is important to consider the knowledge of the relationship between some characteristics of the mandible and airways in various clinical approaches.


Asunto(s)
Mandíbula/diagnóstico por imagen , Cavidad Nasal/diagnóstico por imagen , Faringe/diagnóstico por imagen , Adulto , Tomografía Computarizada de Haz Cónico , Femenino , Humanos , Imagenología Tridimensional , Masculino , Maloclusión de Angle Clase I , Maloclusión de Angle Clase III
6.
Am J Orthod Dentofacial Orthop ; 157(4): 503-515, 2020 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-32241357

RESUMEN

INTRODUCTION: The purpose of this study was to evaluate the buccal and lingual alveolar bone thickness and buccolingual inclination of maxillary posterior teeth in patients with severe skeletal Class III malocclusion with and without mandibular asymmetry and compare with those in patients with skeletal Class I malocclusion. METHODS: Cone-beam computed tomography images of 69 patients with severe skeletal Class III malocclusion and 30 patients with skeletal Class I malocclusion were collected and reconstructed with Dolphin 3D software. Based on the distance from menton to the sagittal plane (d), the patients with skeletal Class III malocclusion were divided into a symmetry group (d ≤ 2 mm) and an asymmetry group (d ≥ 4 mm). Buccal and lingual alveolar bone thickness and buccolingual inclination of maxillary posterior teeth were measured and compared. Correlations among dental measurements, severity of sagittal discrepancy, and mandibular deviation were analyzed. RESULTS: Maxillary posterior teeth on the deviated side in Class III asymmetry group and symmetry group were buccally inclined compared with the Class I group (P < 0.001). A significant negative correlation was noted between buccolingual inclination of maxillary posterior teeth and ANB value with Spearman correlation coefficient of maxillary first molar, second premolar, and first premolar of -0.687, -0.485 and -0.506, respectively (P < 0.001). Maxillary first molar showed thinner buccal alveolar bone on deviated side in asymmetry group and symmetry group of Class III, compared with the Class I group, with average values of 1.21 mm, 1.19 mm, and 1.83 mm, respectively (P < 0.05). The maxillary first premolar also showed thinner buccal alveolar bone on deviated side in Class III asymmetry group compared with the Class I group, with average values of 0.87 mm and 1.28 mm, respectively (P < 0.05). CONCLUSIONS: Decompensation of buccally inclined posterior teeth in patients with skeletal Class III malocclusion should be more cautious owing to thinner buccal alveolar bone to avoid a high risk of fenestration and dehiscence.


Asunto(s)
Maloclusión de Angle Clase III , Maloclusión de Angle Clase I , Maloclusión , Tomografía Computarizada de Haz Cónico , Humanos , Mandíbula , Maxilar
7.
Evid Based Dent ; 21(1): 30-31, 2020 03.
Artículo en Inglés | MEDLINE | ID: mdl-32221494

RESUMEN

Design Systematic reviewStudy population Orthodontic patients undergoing treatment with removable thermoplastic retainers compared with conventional fixed orthodontic appliances. The mean age of patients was between 15 and 33 years. Data sources Six electronic databases including: Scopus, Web-of-Science, PubMed, Cochrane, Clinical Trials and Grey Literature were searched in addition to a search of references in eligible studies with no restriction of language. Out of 559 studies, 55 were eligible. Only four articles were included; three non-randomised and one randomised controlled trial (RCT) involving 96-182 patients. The studies included were completed within 2005-2016.Study selection Clinical trials involving orthodontic patients undergoing treatment using thermoplastic removeable aligners, namely Invisalign, in comparison to conventional fixed orthodontic appliances of either self-ligating or tip-edge bracket systems were included.Data extraction and synthesis Two members of the research team independently selected articles which fulfilled the inclusion criteria and compared results prior to data collection. A third party examiner was available to resolve disagreements. The study quality was analysed for presence of bias; three non-randomised studies were evaluated and scored using the Methodological Index for Non-Randomised Studies (MINORS), one study was considered high methodological quality, two were considered moderate. The RCT was assessed using the Cochrane Collaboration Common Scheme for Bias and was deemed to be low risk of bias. Results The results suggest that Invisalign can provide successful alignment, however, it poses difficulties in achieving occlusal contacts, buccolingual inclination and vertical movement of teeth. One study found that Invisalign cases are more susceptible to relapse, which can be explained through the tipping mechanism compared to bodily movement, of conventional fixed appliances. Furthermore some studies show that although using aligners can result in overall shorter treatment time the final occlusion was not favourable. The outcome of the RCT, showed that aligners can be successful in treating class I malocclusions in extraction cases.Conclusions This systematic review found that the use of clear aligners made no significant difference to treatment time compared with conventional appliances. Additionally, removable aligners were effective in crowding cases but had limitations in achieving favourable outcomes in the anterior-posterior position and final occlusion, as well as being more likely to relapse post treatment.


Asunto(s)
Maloclusión de Angle Clase I , Maloclusión , Aparatos Ortodóncicos Removibles , Adolescente , Adulto , Estética Dental , Humanos , Aparatos Ortodóncicos Fijos , Adulto Joven
8.
J Craniofac Surg ; 31(3): 716-719, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32049900

RESUMEN

BACKGROUND: Maxillomandibular advancement is an effective surgical option for obstructive sleep apnea (OSA) that achieves enlargement of the upper airway by physically expanding the facial skeleton. The authors sought to determine whether an advancement of 10 mm predicts surgical success and if any correlation existed between the magnitude of mandibular/maxillary advancement and improvement in polysomnography metrics using aggregated individual patient data from multiple studies. METHODS: A search of the PubMed database was performed to identify relevant articles that included preoperative and postoperative polysomnography data and measurements of the advancement of both the maxillary and mandibular portions of the face in patients with normal or class I malocclusion. Each patient was stratified into "Success" or "Failure" groups based on criteria defining a "Success" as a 50% preoperative to post-operative decrease in AHI or RDI and a post-operative AHI or RDI <20. RESULTS: A review of the PubMed database yielded 162 articles. Review of these resulted in 9 manuscripts and a total of 109 patients who met the inclusion criteria. There was no statistically significant difference in the amount of anterior advancement of either the mandible (P = 0.96) or the maxilla (P = 0.23) between the "Success" or "Failure" groups. CONCLUSIONS: While there is a paucity of individual data available, the current data does not support an ideal amount of maxillary or mandibular advancement that is required to obtain a surgical success in the treatment of OSA. Until a multicenter, prospective, randomized trial is performed, surgical planning should be tailored to patient-specific anatomy to achieve the desired result.


Asunto(s)
Maloclusión de Angle Clase I/cirugía , Apnea Obstructiva del Sueño/etiología , Humanos , Maloclusión de Angle Clase I/complicaciones , Mandíbula/fisiopatología , Avance Mandibular , Maxilar/cirugía , Polisomnografía , Resultado del Tratamiento
9.
J Orofac Orthop ; 81(2): 89-99, 2020 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-32006046

RESUMEN

PURPOSE: The aim of this study was to examine possible parameters correlating to the shape of the curve of Spee (COS) by analyzing multiple setups of the same Angle class I patient case. METHODS: In all, 65 setups of the same Angle class I patient case were constructed. We measured the depth of the COS, length and width of the dental arch, steps, rotations, spaces and symmetry of the constructed setups. With a correlation analysis, possible relationships between the depth of the COS and measured parameters were evaluated. RESULTS: The COS in the constructed setups was more exaggerated than in the reference case but none of the measured parameters correlated to the depth of the COS. The largest deviation was found on the mesiobuccal cusp tip of the first molar (-0.5 ± 0.4 mm left side; -0.8 ± 0.5 mm right side). This study found a negative correlation between the length and width of the lower dental arch (r = -0.61). While maintaining Angle class I, a large spread width of the depth of the COS, the dental arch width and length was shown. CONCLUSION: The different manifestations of the COS in this study show the freedom of arrangement of the individual tooth morphology without exhibiting a correlation to parameters of the dental arch.


Asunto(s)
Maloclusión de Angle Clase I , Cefalometría , Arco Dental , Humanos , Mandíbula , Diente Molar
10.
J Contemp Dent Pract ; 20(8): 994-999, 2019 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-31797860

RESUMEN

AIM: The contemporary article aims to review and compare various literatures concerning different conclusions regarding the correlation between tooth size discrepancy (TSD) and Angle's malocclusion groups. BACKGROUND: Acquiring the ideal occlusion plays one of the major roles while designing the treatment plan for an orthodontic patient, any alterations in the individual tooth sizes are called TSD and will hinder this prime requirement. By determining the correct tooth size ratio, it further helps in acquiring the accurate interdigitation, balanced occlusion, and also predicting the orthodontic treatment results. Various investigations were carried out to know the correlation between tooth size discrepancies and different malocclusion groups, of which, a few reported a statistically significant difference whereas others reported no significant difference. REVIEW RESULTS: A computerized database quest was operated utilizing the Medline database (Pubmed/Medline) for original research and review articles. Publications between 1946 and 2018 were included. Four hundred twenty-one articles were recovered from database search and, among them, 66 articles were selected to review the full-article. CONCLUSION: Although a comparison was done between the tooth-size ratios and malocclusion groups (classes I, II, and III), many investigators noted no significant difference but there is an inadequacy in the data particularly related to subgroups of Angle's classification of malocclusion among these investigations; therefore, further studies are required to interpret this correlation. CLINICAL SIGNIFICANCE: As there is high incidence of tooth size discrepancies noted in the previous literature orthodontist, Bolton's analysis regardless of malocclusion group, sex, and ethnicity is highly recommended.


Asunto(s)
Maloclusión de Angle Clase III , Maloclusión de Angle Clase II , Maloclusión de Angle Clase I , Maloclusión , Diente , Humanos , Odontometría
11.
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
12.
Am J Orthod Dentofacial Orthop ; 156(4): 512-521.e6, 2019 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-31582123

RESUMEN

INTRODUCTION: This prospective cohort study aimed to evaluate canine substitution supported by skeletal anchorage as a viable treatment protocol for patients with maxillary lateral incisor agenesis (MLIA) and skeletal Class I or Class III. METHODS: Patients (n = 30) who met the following criteria were recruited: (1) bilateral MLIA or unilateral MLIA with a riziform contralateral incisor with a planned extraction; (2) skeletal Class I or Class III; and (3) dentoalveolar discrepancy in the mandible <5 mm. The archwire sequence routine was administered, combined with a rapid palatal expander, temporary intraoral skeletal anchorage device, and intermaxillary traction with Class III elastics. The results of the cephalometric analyses, peer assessment rating indexes, and the patient's smile self-evaluation using the visual analog scale were compared between initial and final treatments. RESULTS: This study indicated that closing the space in patients with Class I or Class III malocclusion by using temporary intraoral skeletal anchorage devices in the mandible, along with Class III elastics, yielded satisfactory outcomes. Proper occlusion was established by mesialization of the maxillary teeth and correction of the intermaxillary discrepancy, thereby yielding beneficial and significant cephalometric changes after the treatment. The soft tissue profile was maintained when it was harmonious before the treatment and improved posttreatment in patients in whom the profile was initially inharmonious. All occlusions improved, as evidenced by the peer assessment rating index. Smile esthetics were also enhanced after orthodontic treatment for all patients. CONCLUSIONS: Canine substitution may be safely offered to patients with Class I and Class III skeletal pattern and MLIA.


Asunto(s)
Anodoncia/terapia , Diente Canino , Maloclusión de Angle Clase III/terapia , Maloclusión de Angle Clase I/terapia , Métodos de Anclaje en Ortodoncia/métodos , Técnicas de Movimiento Dental/métodos , Adolescente , Cefalometría , Niño , Terapia Combinada , Estética Dental , Aparatos de Tracción Extraoral , Femenino , Humanos , Masculino , Técnica de Expansión Palatina , Estudios Prospectivos , Resultado del Tratamiento , Escala Visual Analógica , Adulto Joven
14.
Dental Press J Orthod ; 24(4): 46-53, 2019 Sep 05.
Artículo en Inglés | MEDLINE | ID: mdl-31508706

RESUMEN

INTRODUCTION: Conventional direct and indirect bonding techniques fail to obtain the ideal bracket position. OBJECTIVE: To compare the accuracy of virtual and conventional direct bonding of orthodontic accessories. METHODS: A single virtual configuration (dental mannequin with Class I malocclusion) served as basis for generating the reference model (treated virtually) and the intervention models (10 digital models and 10 solid models, obtained by means of prototyping). A total of 560 teeth were then equally distributed between a group of orthodontists (Group I, direct bonding; and Group II, virtual bonding), working in two different time intervals. The individual positions of the accessories were measured after three-dimensional superimposition with customized software. The Student's-t test for paired samples, and Chi-square tests were used for statistical analysis, both at the level of significance of 5%. RESULTS: In comparison of the errors in raw values, there were significant differences only in the vertical (p< 0.001) and horizontal dimensions (p< 0.001). Considering the groups of ranges by clinical limits of the deviations, these differences were significant in the three dimensions, vertical (p< 0.001), horizontal (p= 0.044) and angular (p= 0.044). CONCLUSION: Virtual bonding made it possible to obtain more precise/accurate positioning of the orthodontic accessories. The potential accuracy of this method brings new perspectives to refining the indirect bonding protocols.


Asunto(s)
Recubrimiento Dental Adhesivo , Maloclusión de Angle Clase I , Soportes Ortodóncicos , Diente , Modelos Dentales , Humanos
15.
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
16.
Am J Orthod Dentofacial Orthop ; 156(3): 401-411, 2019 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-31474270

RESUMEN

A 24-year-old man presented with a severe skeletal class III malocclusion, associated with an anterior and posterior crossbite in the left side, upper and lower lip eversion, skeletal asymmetry, midline discrepancy, diastemas in the maxillary and mandibular dental arches, and agenesis of maxillary lateral incisors and canines with retained deciduous teeth. Treatment was performed with the use of the Win Lingual System. When the 0.016 × 0.022-inch NiTi archiwire was applied, the deciduous teeth were extracted and replaced with temporary crowns connected to the appliance. After the aligning, leveling, and diastema closure phases, a modified Le Fort II osteotomy, a mandibular setback with a bilateral sagittal split osteotomy and a genioplasty were performed. Implants were placed in the canine site through a flapless guided surgery, and cantilevered temporary bridges were delivered. Final prosthetic rehabilitation included veneers for the central incisors and zirconia-ceramic cantilevered bridges for the canine and lateral incisors. After 36 months of active treatment, the patient showed an Angle Class I molar and canine relationship and an ideal overbite and overjet. His profile had improved, lips were competent, and gingival levels were acceptable. The lateral radiograph and cephalometric analysis showed a good balance of the skeletal pattern, a good profile of the soft tissue, and proper inclinations of the maxillary and mandibular incisors in relation to maxilla and mandible. After 2 years of follow-up, the patient had a pleasant smile and no relapse, or joint or muscular pain.


Asunto(s)
Anodoncia/complicaciones , Maloclusión de Angle Clase III/terapia , Diseño de Aparato Ortodóncico/instrumentación , Diseño de Aparato Ortodóncico/métodos , Aparatos Ortodóncicos , Adulto , Cefalometría , Diente Canino , Implantación Dental Endoósea , Implantes Dentales , Modelos Dentales , Diastema/cirugía , Diastema/terapia , Estética Dental , Humanos , Incisivo , Labio , Masculino , Maloclusión de Angle Clase I/complicaciones , Maloclusión de Angle Clase III/diagnóstico por imagen , Maloclusión de Angle Clase III/rehabilitación , Maloclusión de Angle Clase III/cirugía , Mandíbula/cirugía , Maxilar/cirugía , Diente Molar , Métodos de Anclaje en Ortodoncia/instrumentación , Métodos de Anclaje en Ortodoncia/métodos , Soportes Ortodóncicos , Alambres para Ortodoncia , Osteotomía , Sobremordida/terapia , Radiografía Panorámica , Técnicas de Movimiento Dental/instrumentación , Técnicas de Movimiento Dental/métodos , Adulto Joven
17.
Shanghai Kou Qiang Yi Xue ; 28(3): 284-287, 2019 Jun.
Artículo en Chino | MEDLINE | ID: mdl-31489417

RESUMEN

PURPOSE: To investigate the prevalence of malocclusion and the correlation between caries and malocclusion in mixed dentition of primary students in Laoshan district of Qingdao city, to provide a scientific basis for early orthodontic treatment. METHODS: According to WHO's oral health survey (basic methods), a survey concerning oral health was performed in 1803 children aged 8-9 years old. SPSS 17.0 software package was used for statistical analysis . RESULTS: 1322 of 1803 pupils suffered from malocclusion, the prevalence of malocclusion in children surveyed was (73.32%). There were 519 cases(39.26%) of Class I malocclusion, 374 cases(28.29%) of Class II malocclusion, 357(27.00%) cases of Class III malocclusion, 72 cases (5.45%) with asymmetric malformation. As regard to clinical manifestations, deep overbite accounted for(37.67%) ,followed by deep overjet(29.19%), dental crowding (16.94%) and crossbite(16.03%). The prevalence of caries was 64.23%. Among them, there were 625 males (34.66%) and 532 females(29.51%). CONCLUSIONS: The prevalence rate of malocclusion in mixed dentition of primary students in Laoshan district of Qingdao district is not optimistic, the incidence of malocclusion is closely related to caries.


Asunto(s)
Maloclusión de Angle Clase II , Maloclusión de Angle Clase I , Sobremordida , Niño , China/epidemiología , Femenino , Humanos , Masculino , Maloclusión de Angle Clase I/epidemiología , Maloclusión de Angle Clase II/epidemiología , Sobremordida/epidemiología , Prevalencia , Encuestas y Cuestionarios
18.
Dental Press J Orthod ; 24(3): 55-63, 2019 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-31390450

RESUMEN

INTRODUCTION: Resting tongue posture affects the surrounding structures and, theoretically, may result in altered arch form and jaw relationship. OBJECTIVE: The objective of the present study was to investigate the association between resting tongue posture as observed in lateral cephalometric radiograph, sagittal jaw relationship and arch form. METHODS: The study was conducted on pretreatment lateral cephalograms and dental casts of 90 subjects. Subjects were equally divided into three groups, based on sagittal jaw relationship (Class I, II and III). Tongue posture was determined in terms of tongue-to-palate distances at six different points (distances 1 to 6) using ViewPro-X software, according to the method described by Graber et al in 1997. The arch widths (intercanine and intermolar widths) were evaluated on pretreatment dental casts. RESULTS: Tongue-to-palate distances were found to be comparable among different study groups. Significant differences were found in intercanine and intermolar widths at the cuspal and gingival levels among the study groups, except for intercanine width at cuspal level in maxilla and intermolar width at cuspal level in mandible. Moderate positive correlation was found between arch widths ratios at distances 3 and 4 in skeletal Class III group. Effect size was found to be moderate to large in different sagittal skeletal patterns and arch widths. CONCLUSION: The results of the current study showed no significant differences in the resting tongue posture among the groups, and moderate to weak correlation between tongue posture and dental arch widths.


Asunto(s)
Arco Dental , Maloclusión de Angle Clase I , Cefalometría , Humanos , Mandíbula , Maxilar , Postura
19.
Dental Press J Orthod ; 24(3): 88-98, 2019 Aug 01.
Artículo en Inglés | MEDLINE | ID: mdl-31390455

RESUMEN

Tooth crowding and protrusions demand rigorous attention during orthodontic planning that includes the extraction of first and second premolars. Some characteristics, such as dentoalveolar bone discrepancies, maxillomandibular relations, facial profile, skeletal maturation, dental asymmetries and patient cooperation, are important elements of an orthodontic diagnosis. This study discusses the options of treatments with extractions and describes the correction of a Class I malocclusion, bimaxillary protrusion, severe anterior crowding in both dental arches and tooth-size discrepancy, using first premolar extractions.


Asunto(s)
Maloclusión de Angle Clase I , Ortodoncia , Diente Premolar , Cefalometría , Humanos , Ortodoncia Correctiva , Extracción Dental
20.
Bull Tokyo Dent Coll ; 60(3): 163-176, 2019 Sep 07.
Artículo en Inglés | MEDLINE | ID: mdl-31366823

RESUMEN

Many studies have investigated age-related change in normal occlusion and during the post-retention phase of orthodontic treatment. None, however, have investigated such change in malocclusion. The purpose of this study was to compare age-related change in Angle Class I crowding with that in normal occlusion. Dental casts obtained from 10 men and 2 women in their 20s and then again in their 40s were digitized with a 3-dimensional laser scanner to measure anterior crowding, angulation, inclination, andarch width and length. A paired t -test was used to evaluate change in these values betweenthe two sets of casts. A student's t -test was used to compare values between the crowdingand normal groups. The casts obtained from individuals with untreated Angle Class Icrowding revealed that anterior crowding increased with age due to a decrease in thelength of the maxillary arch. Clear lingual inclination of the maxillary incisors and mesiolingual inclination of the maxillary canines were also observed. A decrease was observedin the anterior arch width and an increase in crowding due to lingual inclination of themandibular canines in the mandible. The space between the mandibular central incisors and between the mandibular lateral incisors and canines was particularly associated withan increase in crowding, suggesting that this was age-related. A comparison betweenpatients in their 40s with Angle Class I crowding and those with normal occlusion revealedthat the increase in maxillary anterior crowding was greater in the former. Mandibularanterior crowding increased at around the same rate, however.


Asunto(s)
Maloclusión de Angle Clase I , Maloclusión , Cefalometría , Diente Canino , Arco Dental , Modelos Dentales , Femenino , Humanos , Incisivo , Masculino , Mandíbula , Maxilar
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