Long-term evaluation of condylar positional and volumetric parameters and skeletal stability in Class III bimaxillary orthognathic surgery patients.

This retrospective study examined long-term (4-5 years) condylar positional and volumetric changes and skeletal stability after bimaxillary orthognathic surgery in skeletal Class III patients. Pre-surgical (T0: 0.9 ± 1.1 months) and post-surgical (T1: 0.6 ± 0.7 months; T2: 12.8 ± 3.1 months; T3: 56.5 ± 6.5 months) cone beam computed tomography (CBCT) images of 22 patients were obtained. CBCT multiplanar reformation (MPR) images were generated, and three-dimensional (3D) condylar models were constructed and superimposed to compare changes in condylar volume from pre- to postoperative. Condylar position in the sagittal and coronal planes altered immediately after surgery; however at long-term follow-up, the condyles had returned to their pre-surgical position. The condyles remained slightly inwardly rotated at short-term (-2.6°, 95% confidence interval -3.5° to -1.7°) and long-term (-1.9°, 95% confidence interval -2.8° to -1.0°) follow-up. Changes in condylar volume were insignificant after surgery. Condylar positional changes had no effect on skeletal stability. However, patients with an increased face height prior to surgery and more retrusive jaw position postoperatively were more prone to condylar resorption. Surgical changes remained stable 4-5 years after surgery. In conclusion, condylar position changed insignificantly following surgical correction in Class III patients provided that the correct surgical technique was employed.

Tratamento da classe III com disjunção maxilar e tração reversa da maxila: relato de caso clínico / Class III treatment weth maxillary disjunction and reverse maxillary traction: clinical case report

Objetivo: A má oclusão classe III de Angle se caracteriza por protrusão mandibular, retrusão maxilar ou pela combinação de ambas. Além de prejudicar a estética facial do paciente, essa má oclusão pode causar alterações funcionais e respiratórias. Uma das alternativas de tratamento para esses casos é o uso da máscara de Petit e do aparelho disjuntor de Hyrax. Este estudo tem como objetivo avaliar por meio da cefalometria ortodôntica se o tratamento com expansão maxilar em conjunto com a tração reversa da maxila diminuem os agravos estéticos e funcionais do paciente Classe III. Relato de caso: o relato de caso descrito no presente trabalho é sobre uma paciente que foi submetida a esse tratamento, sendo descrito por meio de análises cefalométricas, exames radiográficos, fotos intrabucais e achados clínicos. Considerações finais: A verificação dos resultados obtidos após o término do tratamento mostrou que a paciente teve uma boa adesão ao uso desses aparelhos e obteve resultados satisfatórios na sua função mastigatória, na sua oclusão e na sua estética facial e dentária.(AU)

Objective: Angle class III malocclusion is characterized by mandibular protrusion, maxillary retrusion or a combination of both. In addition to impairing the patient's facial aesthetics, this malocclusion can cause functional and respiratory changes. One of the treatment alternatives for these cases is the use of the Petit mask and the Hyrax breaker device. This study aims to evaluate, through orthodontic cephalometry, whether the treatment with maxillary expansion in conjunction with the reverse traction of the maxilla reduces the aesthetic and functional problems of Class III patients. Case report: the case report described in the present work is about a patient who underwent this treatment, being described through cephalometric analysis, radiographic examinations, intraoral photos and clinical findings. Final considerations: The verification of the results obtained after the end of the treatment showed that the patient had a good adherence to the use of these devices and obtained satisfactory results in her masticatory function, in her occlusion and in her facial and dental aesthetics.(AU)

Associations between skeletal discrepancies, breathing pattern, and upper airway obstruction in Class III malocclusions.

OBJECTIVE: To verify the associations between sagittal and vertical skeletal discrepancies, changes in upper airways, and breathing pattern in children and adolescents with Angle Class III and Class III subdivision malocclusions. METHODS: Eighty-five children and adolescents with a mean age of 9.5 ± 1.74 years were selected. Cephalometry assessed the sagittal relationship (AO-BO measurement), facial types (Ricketts VERT index), nasopharynx, and oropharynx. An otorhinolaryngologist analyzed the breathing pattern and upper airway obstruction during anamnesis, physical examination, anterior rhinoscopy, and nasofibroscopy. Medical records were also reviewed. For statistical analysis, ordinary one-way ANOVA, Kruskal-Wallis (Tukey's post-hoc), unpaired t-test, Pearson's correlation, chi-square, and Fisher's exact tests (p < 0.05) were used. RESULTS: The nasopharyngeal cephalometric dimension and pharyngeal tonsil hypertrophy were associated, whereas the oropharyngeal cephalometric dimension and palatine tonsils hypertrophy were not. Sagittal discrepancies were associated with septum deviation, while facial type was associated with inferior turbinate and palatine tonsils hypertrophy. However, facial type was not associated with breathing pattern, septum deviation, and pharyngeal tonsils hypertrophy. CONCLUSIONS: Sagittal discrepancies and type of malocclusion were not associated with breathing pattern and changes in upper airways, except for the severity of septum deviation and Class III malocclusions, which were associated with large sagittal discrepancies. Although the facial types analyzed presented signs of airway obstruction, the highest prevalence of inferior turbinate and palatine tonsils hypertrophy were found in patients with dolichofacial type.

Effects of maxillary expansion and protraction on pharyngeal airway dimensions in relation to changes in head posture and hyoid position : A retrospective cohort study.

PURPOSE: To assess changes in pharyngeal airway dimensions, head posture and hyoid position after maxillary expansion and face mask (FM) treatment compared to untreated class III patients. METHODS: This study examined 24 class III patients (10 girls, 14 boys, mean age: 10.97 ± 0.88 years) treated with expansion and a petit-type FM appliance and 24 untreated class III patients (16 girls, 8 boys, mean age: 10.50 ± 1.06 years). Pre- and posttreatment cephalometric radiographs were digitally analysed. Parametric data were analysed with paired and independent-samples t­tests, nonparametric data were analysed with Wilcoxon signed-rank and Mann-Whitney U tests. Spearman's correlation analysis was used to examine the relationship between dental/skeletal treatment changes and those of craniocervical postural position, pharyngeal airway dimension and hyoid position. RESULTS: With respect to the hypopharyngeal airway dimension, the hypopharyngeal sagittal length (CV3'-LPW), velar angle (HRL/U-PNS) and velar length (U-PNS) significantly increased in the treatment group. All the parameters describing head posture and those describing the distances of the hyoid bone to the HRL changed significantly after treatment, but these changes were not significantly different from the control group. In the treatment group, there also occurred a significant increase in the sagittal growth of the maxilla (SNA, Co­A, Na-Perp A, Wits), vertical growth of the maxillomandibular complex (SN-GoGN, N­ANS, N­Me), counterclockwise rotation of the maxilla (SN-PP) and overjet, while a clockwise rotation (y-axis) and a nonsignificant inhibition of the sagittal growth (Co-Gn) of the mandible were observed. The treatment induced increases of hypopharyngeal sagittal length (CV3'-LPW), soft palate thickness and anteroposterior movement of hyoid bone (H-CV3) demonstrated a positive correlation with changes of craniocervical angles (NSL/OPT, NSL/CVT) and a negative correlation with craniohorizontal angles (OPT/HOR, CVT/HOR). The change of the anteroposterior movement of hyoid bone (H-CV3) was also positively correlated with oropharyngeal sagittal length (CV2'-MPW), the hypopharyngeal sagittal length (CV3'-LPW) and the minimal dimension of the pharyngeal airway space (PASmin). CONCLUSION: While expansion and FM treatment did not affect the head posture and hyoid bone position, positive effects were observed in the hypopharyngeal airway region.

[Effects of orthopedic treatment on temporomandibular joint in class III patients with anterior crossbite: a literature review]. / Efectos del tratamiento ortopédico en la articulación temporomandibular en pacientes clase III con mordida cruzada anterior: una revisión de literatura.

Objective: The study aimed to evaluate the effects of orthopedic treatment on the temporomandibular joint (TMJ) in class III patients with anterior crossbite. Materials and Method: Four databases were reviewed until December 2022 (Scopus, PubMed, Embase, and Science Direct). Two independent reviewers selected studies reporting TMJ changes and the presence of TMJ dysfunction in Class III patients with anterior crossbite who received orthopedic treatment. The methodological quality of the studies was analyzed using the PRISMA checklist. Results: Twelve articles were selected for the study after a detailed search according to the selection criteria. Post-treatment studies demonstrated a low prevalence of TMJ pain after using the Delaire face mask, chin rest, modified Jasper Jumper, and fixed reverse Twin block. After treatment with reverse Twin block, an increase in condylar volume and joint spaces (p<0.001) was observed, followed by a significant decrease in posterosuperior joint spaces (p<0.001). Conclusions: Not enough evidence has been found to determine the presence of TMD or TMJ changes after using orthopedic devices for anterior crossbite correction.

Proposta de tratamento ortopédico de paciente Classe III com hyrax modificado e máscara facial ­ relato de caso / Orthopedic treatment proposal of patient Class III with hyrax modified and facial mask ­ case report

Resumo Objetivo: Demonstrar a confecção de um hyrax híbrido apoiado em mini-implante, para o tratamento da classe III. Caso clínico: Paciente D. B. S, sexo masculino, 07 anos de idade, com mordida anterior de topo e mordida cruzada posterior unilateral direita, apinhamento leve nos incisivos inferiores, perda precoce decorrente de cárie dos elementos dentários 54 e 64 e atresia maxilar, contribuindo para a diminuição do perímetro do arco. Discussão: Em pacientes que possuem deficiência maxilar o tratamento deve englobar a estimulação e o direcionamento maxilar através de forças ortopédicas. A terapia com a Expansão Rápida da Maxila (ERM) em associação com a Máscara Facial (MF) é o tratamento mais habitual para a má oclusão classe III sendo utilizada para o tratamento da maxila retruída e também para que se acelere o crescimento maxilar. A utilização da ancoragem esquelética como forma de tratamento precoce da classe III resulta em efeitos ortopédicos fundamentalmente maiores se comparado com o tratamento convencional, desta forma, permite que não haja deslocamento dentário provocado pela força exercida durante a protração maxilar e evitando perda de espaço no perímetro do arco. Conclusão: a ancoragem esquelética vem ampliando as fronteiras dos tratamentos ortodônticos e ortopédicos, aumentando, com isso, a época de início da terapia sem efeitos dentários adversos, sendo a modificação de um hyrax convencional para um híbrido uma opção de melhor custo benefício e biológico. (AU)

Abstract Objective: To demonstrate the construction of a mini-implant-supported hybrid hyrax for the treatment of class III. Case report: Patient DB S, male, 07 years old, with upper anterior bite and right unilateral posterior crossbite, light crowding of the lower incisors, early loss due to caries of the teeth 54 and 64 and maxillary atresia, contributing to the decrease in the perimeter of the arch. Discussion: In patients who have maxillary deficiency, treatment should include maxillary stimulation and direction through orthopedic forces. Therapy with Rapid Maxillary Expansion (RME) in association with Facial Mask (MF) is the most common treatment for class III malocclusion and is used for the treatment of retruded maxilla and also to accelerate maxillary growth. The use of skeletal anchorage as a form of early class III treatment results in fundamentally greater orthopedic effects compared to conventional treatment, thus allowing for no tooth displacement caused by the force exerted during maxillary protraction and avoiding loss of space in the perimeter of the bow. Conclusion: skeletal anchorage has been expanding the frontiers of orthodontic and orthopedic treatments, thereby increasing the time to start therapy without adverse dental effects, with the modification of a conventional hyrax to a hybrid being a more cost-effective and biological option. (AU)

Tratamento compensatório da má oclusão de Classe III esquelética com mini-implante ­ relato de caso / Compensatory treatment of skeletal Class III malocclusion with miniscrews ­ case report

Resumo O tratamento compensatório da má oclusão de Classe III esquelética representa uma opção para pacientes adultos que não desejam se submeter ao tratamento ortodôntico-cirúrgico e desejam melhorias na oclusão e estética facial. O sucesso do tratamento compensatório da má oclusão de Classe III depende de um correto diagnóstico e planejamento de tratamento que considere a gravidade das discrepâncias verticais e anteroposteriores e o padrão de crescimento do paciente. O objetivo deste estudo é apresentar o tratamento de um paciente adulto com má oclusão esquelética moderada de Classe III e protrusão mandibular tratada com ancoragem esquelética e sliding jig ancorado em mini implantes e elásticos intermaxilares de Classe III. Os resultados alcançados levaram a uma melhora significativa no perfil do paciente com a estética do sorriso. Relações de molares e caninos de Classe I foram alcançadas. O sucesso na correção da discrepância oclusal anteroposterior e a correção estética de uma má oclusão de Classe III através do tratamento compensatório com elásticos de Classe III e mini implantes podem ser alcançados se a adesão do paciente for satisfatória. (AU)

Abstract Compensatory treatment of skeletal Class III malocclusion represents an option for adult patients who do not want to undergo orthodontic-surgical treatment and wish occlusion and facial aesthetics improvements. The success of the compensatory treatment of Classe III malocclusion depend on a correct diagnosis and treatment planning that considers the severity of vertical and anteroposterior discrepancies and the patient growth pattern. The aim of this study is to present the treatment of an adult patient with moderate skeletal Class III malocclusion and mandibular protrusion treated with skeletal anchorage whit miniscrew-anchored sliding jig and Class III intermaxillary elastics. The results achieved led to a significant improvement in the patient profile whit smiles esthetics. Class I molar and canine relationships were achieved. Successful on the correction of the anteroposterior occlusal discrepancy and esthetic correction of a Class III malocclusion through compensatory treatment with Class III elastics and miniscrew can be achieved if patient's compliance is satisfactory. (AU)

Bimaxillary Distalization with Skeletal Anchorage for Management of Severe Skeletal Class III Open Bite Malocclusion.

Adult patients with severe vertical growth pattern, skeletal class III malocclusion and open bite anteriorly are difficult orthodontic cases to treat. An orthognathic surgical treatment plan may benefit adult patients with such types of complex malocclusions, however in certain cases, the patient's medical history may contraindicate the surgical treatment plan. A male patient aged 17 years presented with a prognathic mandible, Angle's class III malocclusion on a class III skeletal base with proclination in upper incisors, retroclination of lower incisors, and reduced facial convexity. Patient gave history of asthma and complex cardiac diseases including arrhythmia, irregular heartbeat, and pacemaker. This case report describes a non-surgical approach of distalization of mandibular and maxillary arches performed with the help of miniplates to achieve an improvement in the facial balance without surgery.

Compensation in Class III Malocclusions: Analysis of Tooth Crown Inclination on Digital Dental Casts / Compensação da Má Oclusão de Classe III: Análise da Inclinação das Coroas dos Dentes em Modelos Digitais

The objective of this study was to evaluate the tooth crown inclination in maxillary and mandibular arches in Class III malocclusion individuals, to identify the presence and magnitude of compensation. The study was conducted on 46 plaster casts of individuals with Class III malocclusion, of both genders (25 males and 21 females), with mean age 21 years and 1 month, with indication for compensatory orthodontic treatment. The dental casts models were scanned and the tooth crown inclinations were measured and compared with standard values by the independent t test. All tests considered a significance level of 5% (p<0.05). According to the results there was extensive variation in tooth inclination in Class III malocclusions. Values distribution for incisors highlighted the significant concentration of maxillary incisors in the area of positive values, compared with a very expressive concentration of mandibular incisors in the area of negative values. Compared with normal standards, in Class III malocclusions, the maxillary posterior teeth exhibited smaller palatal inclination than normal, while the mandibular incisors and second molars presented greater lingual inclination. It was concluded that the analysis of inclinations of all crowns of both dental arches in Class III malocclusions, compared with normal standards, evidenced the presence of natural compensation for maxillary posterior teeth, with reduced palatal inclination, as well as increased lingual inclination in mandibular incisors. The parameters of compensation naturally present in Class III malocclusions described, especially in lower incisors, would help clinicians when compensatory treatment is considered. (AU)

O objetivo deste estudo foi avaliar a inclinação das coroas dentárias nas arcadas superior e inferior em indivíduos com má oclusão de Classe III, para identificar a presença e a magnitude da compensação. O estudo foi realizado em 46 modelos de gesso de indivíduos com má oclusão de Classe III, de ambos os sexos (25 homens e 21 mulheres), com média de idade de 21 anos e 1 mês, com indicação de tratamento ortodôntico compensatório. Os modelos de gesso foram digitalizados e as inclinações da coroa dos dentes foram medidas e comparadas com os valores de normalidade pelo teste t independente. Todos os testes estatísticos adotaram um nível de significância de 5% (p <0,05). De acordo com os resultados, houve grande variação na inclinação dentária nas más oclusões de Classe III. A distribuição dos valores para os incisivos destacou a concentração significativa de incisivos superiores na área de valores positivos, em comparação com uma concentração muito expressiva de incisivos inferiores na área de valores negativos. Comparados aos padrões de normalidade, nas más oclusões de Classe III, os dentes posteriores superiores exibiram inclinação palatina menor que o normal, enquanto os incisivos e segundos molares inferiores apresentaram inclinação lingual maior. Concluiu-se que a análise das inclinações de todas as coroas de ambas as arcadas dentárias nas más oclusões de Classe III, comparadas aos padrões de normalidade, evidenciou a presença de compensação natural para os dentes posteriores superiores, com diminuição da inclinação palatina, bem como aumento da inclinação lingual dos incisivos inferiores. Os parâmetros de compensação naturalmente presentes nas más oclusões de Classe III descritos, especialmente nos incisivos inferiores, podem auxiliar o clínico quando o tratamento compensatório é considerado. (AU)

Relapse patterns of two-jaw surgical correction in patients with skeletal Class III malocclusion and different vertical facial types.

The aim of this study was to evaluate postoperative relapse after the surgical correction of skeletal Class III deformities of various facial patterns as a guide to surgical planning. A retrospective cohort study of 90 consecutive patients with skeletal Class III malocclusion who underwent bimaxillary surgery was performed. The surgical outcomes and postoperative stability were compared. The primary predictor variable was vertical facial type, which was classified into three groups according to the Frankfort mandibular plane angle (FMA). The primary outcome of angular and linear measurements was obtained using serial cone beam computed tomography scans obtained at time points of preoperative, 1 week after surgery, and orthodontic debonding. No significant difference in skeletal relapse was observed in patients with the different vertical facial types. The mandible displayed a forward and upward relapse in all three groups postoperatively. The patients with a low FMA exhibited a more consistent mandibular relapse pattern than those with a normal or high FMA. These findings suggest that bimaxillary surgery is clinically stable for mandibular prognathism regardless of the vertical facial pattern. However, 1-1.5 mm of overcorrection in the mandible setback should be considered in patients with a low FMA, because of the greater facial depth and consistent forward and upward mandibular relapse pattern.

Influence of facial components in class III malocclusion esthetic perception of orthodontists, patients, and laypersons.

PURPOSE: The aim of the present study was to investigate the influence of different facial components (face length, lip volume, nose size, and cheekbone contour) on the perception of facial attractiveness of patients with Angle class III malocclusion in different categories of responders (orthodontists, laypersons, patients) with two-dimensional (2D) and three-dimensional (3D) simulations. METHODS: An ideal standard 3D face was manipulated to create a class III facial malocclusion. Four facial components were modified (face length, lip volume, nose size and cheekbone contour) and the resulting simulations were used to obtain 2D figures and 3D videos, which were evaluated in a survey by orthodontists, patients, and laypersons. RESULTS: No significant differences were detected between the 2D figures and 3D video simulations. Good correspondence was shown between the three categories of responders for the most and the least attractive faces. Smaller lips and bigger nose, regardless to the vertical dimension (short or long face), were found to be the least attractive features with agreement of all respondents. CONCLUSION: Regarding class III facial attractiveness perception, the sum of all facial features and not the alteration of a single component alone seems to play a key role in the perception of facial attractiveness. The 2D or 3D perspective did not play a significant role in perception and the analyzed categories of responders did not show significant differences when perceiving facial attractiveness of the utilized simulations.

Procedimentos interceptores na má oclusão de Classe III ­ relato de caso / Interceptor procedures in class III maloclusion ­ case report

Resumo Este relato de caso apresenta procedimentos ortodônticos interceptivos na dentição mista realizados em paciente com má oclusão esquelética de Classe III de Angle. Aparelhos ortodônticos foram utilizados para beneficiar o posicionamento mandibular e direcionar a erupção dos dentes permanentes, dentre eles estão o aparelho progênico, Schwartz, recuperador e mantenedor de espaço. A utilização desses dispositivos nas fases adequadas ajudou a minimizar a discrepância sagital maxilomandibular, a correção da inclinação dentária e manutenção do perfil facial sem alterações perceptíveis. Sendo assim este relato de caso se apresentou como uma opção adequada na clínica de Ortodontia-odontopediatria no tratamento precoce em paciente com má oclusão Classe III de Angle.(AU)

Abstract This case report presents interceptive orthodontic procedures in the mixed dentition performed in a patient with Angle Class III skeletal malocclusion. Orthodontic appliances were used to benefit mandibular positioning and direct the eruption of permanent teeth, among them are the progenic appliance, Schwartz appliance, recuperator and space maintainer. The use of these devices at the appropriate stages helped to minimize the maxillomandibular sagittal discrepancy, correct tooth inclination and maintain the facial profile without noticeable changes. Therefore, this case report was presented as an adequate option in the Orthodontics-pediatric Dentistry clinic in the early treatment of a patient with Angle Class III malocclusion.(AU)

Má oclusão de Classe III, subdivisão associada à mordida cruzada posterior unilateral e à biprotrusão dentoalveolar ­ tratamento corretivo do Padrão I em adulto jovem / Class III subdivision malocclusion associated to unilateral posterior crossbite and dentoalveolar biprotrusion ­ corrective treatment of Pattern I in young adult

Resumo Indivíduos adultos com má oclusão de mordida cruzada posterior apresentam prognóstico ruim para Expansão Rápida da Maxila (ERM), quando não associada aos dispositivos de ancoragem esquelética temporários ou cirurgia. O objetivo deste estudo foi analisar os efeitos do tratamento ortodôntico corretivo em indivíduo Padrão I com má oclusão de Classe III, subdivisão esquerda associada à mordida cruzada posterior unilateral esquerda e à biprotrusão dentoalveolar em paciente adulto jovem. A correção da mordida cruzada posterior ocorreu pela abertura da sutura palatina mediana, sendo utilizado o disjuntor Haas, o qual ocasionou ulcerações na mucosa palatina e foi substituído pelo disjuntor Hyrax. Imediatamente após a remoção do expansor, instalou-se aparelho ortodôntico pré-ajustado para o alinhamento e nivelamento. Obteve-se a correção da biprotrusão dentoalveolar por meio da extração dos quatro primeiros pré-molares, utilizando-se mecânica ortodôntica para retração dos dentes anteriores e fechamento dos espaços. Foram avaliados os resultados cefalométricos, oclusão e face. O resultado do tratamento propiciou uma relação de Classe I normal tratada com sobressaliência horizontal e vertical corretas, assim como melhora do perfil facial do paciente. Conclui-se que a ERM, sem dispositivos de ancoragem esquelética ou cirurgia, foi efetiva na correção da mordida cruzada posterior no adulto jovem, assim como o aparelho ortodôntico pré-ajustado associado à extração dos quatro primeiros pré-molares para o tratamento da biprotrusão. O correto diagnóstico, plano de tratamento, mecânica ortodôntica e contenção favoreceram a obtenção de uma relação de Classe I, oclusão normal tratada ao final do tratamento, assim como a estabilidade do tratamento dois anos após o término.(AU)

Abstract Adult individuals with posterior crossbite malocclusion show poor prognostic for Rapid Palatal Expansion (RPE), when not associated to temporary skeletal anchorage devices or surgery. This study aimed to analyze the effects of orthodontic corrective treatment of Pattern I individual with Class III left subdivision malocclusion associated to unilateral posterior left side crossbite and dentoalveolar biprotrusion in young adult patient. The correction of unilateral posterior left side crossbite was obtained by midpalatal suture opening, being performed the RPE with Haas appliance, that caused palatal ulceration and was replaced by Hyrax appliance. Immediately after the expander appliance removal, pre-adjusted orthodontic appliance was installed for alignment and leveling. The correction of dentoalveolar biprotrusion was performed by extraction of four first premolars, using orthodontic mechanics for retraction of anterior teeth and spaces closure. The cephalometric, occlusion and face results were evaluated. The correction of Class III left subdivision malocclusion, unilateral posterior left side crossbite and dentoalveolar biprotrusion provided Class I normal occlusal relationship with normal overjet and overbite, as well as improvement of patient facial profile. Therefore, it was concluded that RPE, without temporary skeletal anchorage devices or surgery, was effective in correcting posterior crossbite malocclusion in young adult, as well as the pre-adjusted orthodontic appliance associated to the extraction of four first premolars for the treatment of dentoalveolar biprotrusion. The accurate diagnostic, treatment plan, orthodontic mechanic and retention allowed a Class I relationship, treated normal occlusal at the end of the treatment, as well as stability two years after the end. (AU)

Three-dimensional changes in the location of soft tissue landmarks following bimaxillary orthognathic surgery.

OBJECTIVES: We sought to determine the amount of three-dimensional (3D) movement of soft tissue landmarks in patients who underwent bimaxillary orthognathic surgery. MATERIALS AND METHODS: We recruited 28 patients (11 women and 17 men), who had received one-piece Le Fort I osteotomy with maxillary advancement and impaction, and bilateral sagittal split ramus osteotomy for mandibular setback. The 3D images were acquired 1-7 days before surgery and at least 6 months after surgery using stereophotogrammetry. We recorded 50 coordinate measurements and correlated the movements between soft and hard tissues. Paired samples t­test, independent samples t­test, and Pearson's correlation analysis were used for statistical analysis. RESULTS: Patients' ages ranged from 17-31 years (mean 20.4 ± 3.0 years). The mean advancement and impaction of the maxilla was 4.7 ± 1.2 and 2.2 ± 1.0 mm, respectively. The mean setback of the mandible was 4.2 ± 1.6 mm. Menton (Me) moved significantly closer to the midsagittal plane, and the bilateral alare (Al) and alar curvature (Ac) moved laterally. In addition, pronasale (Prn), bilateral Al, Ac, subnasale (Sn), subspinale (Ss), labiale superior (Ls), sublabiale (Sl), pogonion (Pog), and Me moved upwards. The bilateral cheek bone (Cbp), Al, Ac, Prn, Sn, Ss, Ls, and stomion (Sto) moved forward. Li, Sl, Pog, and Me moved backward. Interestingly, poor correlation was found between soft tissue landmarks and hard tissue movements. CONCLUSION: We observed 3D coordinate changes in several soft tissue landmarks in the middle and lower thirds of the face. The results of this study may be useful for estimating postoperative changes in similar patients.

Distalização dos dentes inferiores para o tratamento da má oclusão de Classe III com o auxílio de dispositivos de ancoragem temporária ­ relato de caso / Distalization of lower teeth for the treatment of Class III malocclusion with the aid of temporary anchorage devices ­ case report

Resumo Este artigo descreve o tratamento ortodôntico de uma paciente jovem de 20 anos com má oclusão de Classe III. O plano de tratamento consistia em distalizar ambos os quadrantes posteriores inferiores para corrigir a má oclusão de Classe III. Além disso os objetivos do tratamento também incluíam a correção da mordida cruzada posterior e do apinhamento ântero- -inferior. Dois mini-implantes foram posicionados entre os segundos pré-molares e primeiros molares inferiores com o intuito de serem utilizados como ancoragem indireta. Molas espirais abertas foram utilizadas para a distalização, além do auxílio de elásticos de Classe III. O período total de tratamento foi de 24 meses. Ao final do tratamento, uma excelente oclusão foi obtida na paciente, juntamente com uma melhora no seu perfil facial. (AU)

Abstract This article describes the orthodontic treatment of a 20-year-old female patient with Class III malocclusion. The treatment plan consisted of distalizing both lower posterior quadrants to correct Class III malocclusion. In addition, treatment goals also included correction of posterior crossbite and anteroinferior crowding. Two mini-implants were placed between the second premolars and mandibular first molars in order to be used as indirect anchorage. Open spiral springs were used for distalization, in addition to the aid of Class III elastics. The total treatment period was 24 months. At the end of the treatment, an excellent occlusion was achieved in the patient along with an improvement in her facial profile (AU)

Tratamento da má-oclusão de Classe III ­ uma análise sistemática da literatura / Treatment of Class III malocclusion ­ a systematic analysis of literature

Resumo O objetivo deste trabalho foi de determinar, por meio de uma revisão sistemática da literatura, os tipos e os efeitos dos aparelhos ortodôntico-ortopédicos dentofaciais no tratamento da má-oclusão esquelética de Classe III de Angle, em pacientes em crescimento, selecionando artigos com maior impacto de evidência científica. Para se alcançar esse objetivo, realizou-se uma busca retrospectiva de 1994 a 2019, nas bases de dados eletrônicas (Pubmed). Foram pesquisados os termos "Class III malocclusion", "malocclusion, Angle Class III/therapy" e "orthopedic treatment Class III". Os critérios de seleção foram configurados para incluir apenas ensaios clínicos randomizados da plataforma Pubmed. Os artigos foram selecionados e avaliados, de forma independente, por dois autores (kappa 0,88), baseados nos critérios de inclusão e exclusão. A estratégia de busca resultou em 25 artigos, sendo 18 resultantes da plataforma Pubmed. Após a análise desses estudos, concluiu-se que o tratamento da má-oclusao de Classe III em pacientes ainda em crescimento tem como principal modalidade terapêutica o uso da máscara facial de tração maxilar. Outros aparelhos ortodôntico-ortopédicos vêm sendo utilizados, porém com respostas mais dentoalveolares. Em pacientes que já cessaram o crescimento e não optaram pela cirurgia ortognática para a correção de suas deficiências, a abordagem com mini-implantes e miniplacas vem sendo utilizada com resultados bastante positivos, gerando excelentes tratamentos e em menor quantidade de tempo, porém ainda há poucas evidências científicas que suportam a eficácia dessa modalidade terapêutica.(AU)

Abstract The aim of this study was to determine through a systematic literature review the types and effects of dentofacial orthodontic-orthopedic appliances in the treatment of Angle Class III skeletal malocclusion in growing patients, selecting articles with higher impact of scientific evidence. To reach this goal, a retrospective search from 1994 to 2019 was carried out in the electronic databases (Pubmed). The terms "Class III malocclusion", "malocclusion, Angle Class III/therapy" and "orthopedic treatment Class III" were searched. Selection criteria were set to include only randomized trials of Pubmed platform. The articles were independently selected and evaluated by two authors (kappa 0.88), based on inclusion and exclusion criteria. The search strategy resulted in 25 articles, 18 resulting from the Pubmed platform. After analyzing these studies, it was concluded that the treatment of Class III malocclusion in patients still growing has as main therapeutic modality the use of facial mask of maxillary traction. Other orthodontic-orthopedic appliances have been used, but with more dentoalveolar responses. In patients who have already ceased growth and did not chose orthognathic surgery to correct their deficiencies, the approach with mini-implants and miniplates has been used with very positive results, generating excellent treatments and in a shorter time, however there are still few scientific evidences that support the effectiveness of this therapeutic modality (AU)

Planejamento interdisciplinar da correção da classe III esquelética com desgastes incisais / Interdisciplinary planning of skeletal class III correction with incisal wear

Resumo Este artigo apresenta um caso clínico cujo plano de tratamento interdisciplinar contemplou uma abordagem ortodôntico-cirúrgica previamente à fase de reabilitação oral em paciente do sexo feminino, adulta, portadora de má oclusão dentária e esquelética de Classe III e com desgastes dentários. A paciente relatou queixa estética da face e do sorriso e o exame extraoral mostrou o terço inferior da face reduzido e ausência de exposição de incisivos superiores com lábios em repouso. Ao exame intraoral, constatou-se a presença da relação de Classe III de molares e caninos, mordida cruzada anterior e desgastes dentários com encurtamento da altura dos incisivos e redução da dimensão vertical de oclusão. Ao final do tratamento, obteve-se Classe I de Angle em molares e caninos, melhora das proporções faciais e da relação sagital entre maxila e mandíbula. O tratamento ortodôntico cirúrgico proveu uma oclusão dentária favorável à reabilitação oral com recuperação da dimensão vertical da oclusão, reconstrução dos incisivos e provendo oclusão com estética e função satisfatórias. Este trabalho demonstra a importância e necessidade de uma abordagem interdisciplinar no tratamento da má oclusão esquelética e dentária da Classe III, além de uma interlocução clara entre os profissionais envolvidos. (AU)

Abstract This paper shows a case report in which interdisciplinary treatment plan comprised a surgically assisted orthodontic approach previously to the oral rehabilitation in a female, adult patient with dental and skeletal Class III malocclusion and tooth wear. The patient complained about her smile and face aesthetics and the extraoral exam revealed reduced lower lower facial third and absence of upper incisors exposure upper incisor exposure at rest. Intraoral exam exhibited molar and canine Class III relationship, anterior crossbite, tooth wear, shortening of incisors height and reduced occlusal vertical dimension. As treatment results, molar and canine class I relationship was obtained, as well as improvement of the facial proportions and sagittal relation between maxilla and mandible. The surgically assisted orthodontic treatment provided a dental intercuspation favorable to oral rehabilitation, restoring occlusal vertical dimension, reshaping the incisors, and providing occlusion with satisfactory aesthetics and function. This paper demonstrates the importance and necessity of an interdisciplinary approach on the treatment of dental and skeletal Class III malocclusion and clear communication of all the professionals involved. (AU)

Tratamento de mordida aberta com a técnica ortodôntica fixa sem bráquetes, com tecnologia tridimensional 3DBOT (bracketless orthodontics treatment) / Open bite treatment with fixed orthodontic technique without brackets, three-dimensional technology, 3DBOT (bracketless orthodontics treatment)

Resumo A mordida aberta anterior é um tipo que maloclusão em que há a presença de um trespasse vertical negativo existente entre as bordas incisais dos dentes anteriores superiores e inferiores. Ela é considerada uma anomalia complexa de características distintas e de difícil tratamento, tendo prevalência de 25% a 38% dos pacientes tratados ortodonticamente. O objetivo deste artigo é relatar um caso clínico de Classe III subdivisão direita e mordida aberta utilizando a técnica 3DBOT®, uma técnica fixa, confortável, previsível, imperceptível, com tecnologia 3D e com extrema satisfação comprovada clinicamente. Relato do caso: Paciente V.B.V.S, 23 anos e 1 mês, leucoderma, gênero masculino, dolico suave, perfil reto, simétrico, Classe » de Classe III de molar e canino subdivisão direita, mordida aberta anterior, sorriso invertido, suave apinhamento dentário superior e anterior. Plano de tratamento: Foi planejado o uso do 3DBOT, juntamente com o uso de elásticos intermaxilares e refinamento com o auxílio de alinhadores MyAligner®. Conclusão: A técnica 3DBOT® mostrou ser uma opção viável para tratamento de mordida aberta anterior. (AU)

Abstract Anterior open bite is a type of malocclusion in which there is the presence of a negative vertical overlap between the incisal edges of the upper and lower anterior teeth. It is considered a complex anomaly with distinct characteristics and difficult to treat with prevalence of 25% to 38% of patients orthodontically treated. The aim of this article is to report a clinical case of Class III right subdivision and open bite using 3DBOT technique, a fixed, comfortable, predictable, imperceptible technique with 3D technology and with extreme clinically proven satisfaction. Case report: Patient V.B.V.S., 23 years and 1 month old, leukoderma, male, mild dholico, straight profile, symmetrical, Class » of Class III of molar and canine right subdivision, anterior open bite, inverted smile, mild upper and anterior dental crowding. Treatment plan: The use of 3DBOT was planned along with the use of intermaxillary elastics and refinement with the aid of MyAligner® aligners. Conclusion: The 3DBOT technique showed to be a viable option for treating anterior open bite. (AU)

Orthopaedic and orthodontic treatment with hyrax, Class III elastics on mandibular miniplates, maxillary mini-implants in a Class III adolescent: A case report.

BACKGROUND: The treatment of Skeletal Class III malocclusion continues to be considered as one of the biggest challenges in orthodontics as the success of its correction is largely unpredictable. Early diagnosis and treatment are highly recommended to eliminate primary etiological factors and prevent an increase in severity of the existing malocclusion. However, if the diagnosis is delayed until adulthood, treatment becomes restricted to orthognathic surgery due to limited or no remaining growth potential left. The inherent risks involved with the surgical procedures often preclude the patients from opting for it, thus leaving the orthodontist with no option but to perform possible compensatory treatments to improve facial aesthetics and restore functional occlusion. OBJECTIVE: To report the case of a 15-year old boy (adolescent) with Skeletal Class III malocclusion, a concave facial profile with an anterior crossbite and no incisor visibility during smile. METHODS: Intra-oral skeletally anchored maxillary protraction (I-SAMP) and mini-implants associated with fixed appliance to aid in the correction of the skeletal bases and subsequently relieve the dental crowding. RESULTS: After 36 months of treatment, functional normal occlusion with a Class I molar and canine relation was achieved. The consequential increase in upper lip thickness and decrease in lower lip fullness alongwith an increased exposure of maxillary incisors during smile resulted in a significant improvement of the patient's facial profile and an aesthetically pleasing smile.

Maxillary protraction in patients with unilateral cleft lip and palate : Evaluation of soft and hard tissues using the Alt-RAMEC protocol.

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.