Evaluation of enamel deproteinization in bond strength of orthodontic accessories: A split-mouth randomized clinical trial.

INTRODUCTION: This split-mouth randomized clinical trial aimed to evaluate the influence of dental enamel deproteinization with sodium hypochlorite on orthodontic accessories breakages using 2 orthodontic adhesives. METHODS: Forty patients with indications for orthodontic treatment with fixed appliances were randomly divided into 2 groups according to the orthodontic adhesive used: Transbond XT (3M Unitek, Monrovia, Calif) (n = 20) and Orthocem (FGM Dental Products, Joinville, Santa Catarina, Brazil) (n = 20). A split-mouth trial was conducted in the maxillary teeth; the deproteinization process with 5% sodium hypochlorite was performed on the experimental side. The opposite side served as a control without deproteinization. The primary outcome was the number of orthodontic accessories breakages. The randomization was performed using the BioStat software (AnalystSoft Inc, Walnut, Calif). Single-blind was applied for patients. Orthodontic accessories were bonded according to the manufacturer's instructions. The accessories breakages were followed during the first 6 months of treatment. Intergroup comparisons were performed with t tests and 1 and 2-way analysis of variance. RESULTS: Thirty-nine patients concluded the trial. The Transbond XT group comprised 20 patients (9 male, 11 female), with a mean age of 20.77 ± 6.44 years. The Orthocem group included 19 patients (9 male, 10 female), with a mean age of 23.14 ± 7.98 years. The application of sodium hypochlorite before bonding did not influence the number of orthodontic accessories breakages (P = 0.867). The type of adhesive used, associated or not with the deproteinization, did not affect the number of orthodontic accessories breakages (P = 0.929). CONCLUSIONS: Enamel deproteinization with 5% sodium hypochlorite did not impact the number of orthodontic accessories breakages. In addition, the 2 bonding adhesives used showed similar clinical results, with or without the enamel deproteinization. REGISTRATION: The trial was registered at ensaiosclinicos.gov.br, ReBEC (no. RBR-39ntmjk). PROTOCOL: The protocol was not published before trial commencement. FUNDING: This research did not receive any grant from funding agencies.

Evaluation of the botulinum toxin effects in the correction of gummy smile 32 weeks after application / Avaliação dos efeitos da toxina botulínica na correção do sorriso gengival 32 semanas pós-aplicação

INTRODUCTION: The use of botulinum toxin type A (BTX-A) to correct gummy smile has become popular in recent years. OBJECTIVE: To evaluate the effects of BTX-A application in the correction of gummy smile 2 and 32 weeks after application. METHODS: The sample comprised 35 patients (30 female, 5 male) at a mean age of 25.51 years (±5.59) with gummy smile due to muscular hyperfunction. In each patient, 2U of botulinum toxin was applied in the levator labii superioris alaeque nasi, 2 mm from the nasolabial fold. Photographs of spontaneous smiles were taken at 3 stages: before, 2 and 32 weeks after BTX application. Measurements of the gingival display were performed with the Radioface Studio 2 Software, and the calibration used the actual size of the right maxillary central incisor. Comparison of the three stages evaluated was performed with repeated measures ANOVA and Tukey tests. RESULTS: Gingival display decreased significantly 2 weeks after BTX-A application and increased after 32 weeks but did not return to the initial value. CONCLUSION: There was a significant improvement in gummy smile 2 weeks after botulinum toxin application, and a significant relapse in the gingival display after 32 weeks, however not returning to baseline values.

INTRODUÇÃO: A toxina botulínica tipo A (BTX-A) tem se tornado popular na correção do sorriso gengival nos últimos anos. OBJETIVO: Avaliar os efeitos da aplicação de BTX-A na correção do sorriso gengival 2 e 32 semanas após a aplicação. MÉTODOS: A amostra compreendeu 35 pacientes (30 mulheres, 5 homens) com uma idade inicial média 25,51 anos (±5,59) portadores de sorriso gengival devido à hiperfunção muscular. Em cada paciente foi aplicado 2U de BTX-A no músculo elevador superior da asa do nariz, 2 mm a partir da dobra nasolabial. Foram feitas fotografias dos sorrisos espontâneos dos pacientes em 3 fases: antes, 2 e 32 semanas após a aplicação de BTX-A. As medidas da exposição gengival foram feitas com o Software Radioface Studio 2, e a calibração utilizou o tamanho real do incisive central superior direito. A comparação das 3 fases foi feita com ANOVA de medidas repetidas e teste de Tukey. RESULTADOS: A exposição gengival diminuiu significantemente 2 semanas após a aplicação e aumentou novamente após 32 semanas, mas não retornando aos valores iniciais. CONCLUSÃO: Houve uma melhora significante no sorriso gengival 2 semanas após a aplicação de toxina Botulínica, e uma recidiva significante após 32 semanas, mas não retornando aos valores iniciais.

Attractiveness of the facial profile: comparison of Class II patients treated with Twin Force® or intermaxillary elastics.

OBJECTIVE: To compare the facial profile attractiveness of Class II patients treated with Twin Force® or intermaxillary elastics. METHODS: Sample comprised 47 Class II patients divided into two groups: G1) TWIN FORCE - 25 patients treated with fixed appliances and Twin Force® fixed functional appliance (mean initial age was 17.91 ± 7.13 years, mean final age was 20.45 ± 7.18 years, and mean treatment time was 2.53 ± 0.83 years); G2) ELASTICS - 22 patients treated with fixed appliances and Class II intermaxillary elastics (mean initial age was 15.87 ± 5.64 years, mean final age was 18.63 ± 5.79 years and mean treatment time was 2.75 ± 0.60 years). Lateral cephalograms from pretreatment and posttreatment were used. Cephalometric variables were measured and silhouettes of facial profile were constructed and evaluated by 48 laypeople and 63 orthodontists, rating the attractiveness from 0 (most unattractive profile) to 10 (most attractive profile). Intergroup comparisons were performed with Mann-Whitney and independent t-tests. RESULTS: At pretreatment, facial profile of the Twin Force® group was less attractive than the Elastics group. Treatment with Twin Force® or Class II elastics resulted in similar facial profile attractiveness, but the facial convexity was more reduced in the Twin Force® group. Orthodontists were more critical than laypeople. CONCLUSIONS: Treatment with Twin Force® or Class II elastics produced similar facial profile attractiveness at posttreatment. Profile attractiveness was reduced with treatment in the elastic group, and improved in the Twin Force® group. Facial convexity was more reduced with treatment in the Twin Force® group.

Attractiveness of the facial profile: comparison of Class II patients treated with Twin Force® or intermaxillary elastics

ABSTRACT Objective: To compare the facial profile attractiveness of Class II patients treated with Twin Force® or intermaxillary elastics. Methods: Sample comprised 47 Class II patients divided into two groups: G1) TWIN FORCE - 25 patients treated with fixed appliances and Twin Force® fixed functional appliance (mean initial age was 17.91 ± 7.13 years, mean final age was 20.45 ± 7.18 years, and mean treatment time was 2.53 ± 0.83 years); G2) ELASTICS - 22 patients treated with fixed appliances and Class II intermaxillary elastics (mean initial age was 15.87 ± 5.64 years, mean final age was 18.63 ± 5.79 years and mean treatment time was 2.75 ± 0.60 years). Lateral cephalograms from pretreatment and posttreatment were used. Cephalometric variables were measured and silhouettes of facial profile were constructed and evaluated by 48 laypeople and 63 orthodontists, rating the attractiveness from 0 (most unattractive profile) to 10 (most attractive profile). Intergroup comparisons were performed with Mann-Whitney and independent t-tests. Results: At pretreatment, facial profile of the Twin Force® group was less attractive than the Elastics group. Treatment with Twin Force® or Class II elastics resulted in similar facial profile attractiveness, but the facial convexity was more reduced in the Twin Force® group. Orthodontists were more critical than laypeople. Conclusions: Treatment with Twin Force® or Class II elastics produced similar facial profile attractiveness at posttreatment. Profile attractiveness was reduced with treatment in the elastic group, and improved in the Twin Force® group. Facial convexity was more reduced with treatment in the Twin Force® group.

RESUMO Objetivo: Comparar a atratividade do perfil facial em pacientes Classe II tratados com Twin Force® ou elásticos intermaxilares. Métodos: A amostra foi composta por 47 pacientes Classe II divididos em dois grupos: G1 - Twin Force® (25 pacientes tratados com aparelhos fixos e o aparelho funcional Twin Force®; idade inicial média de 17,91 ± 7,13 anos, idade final média de 20,45 ± 7,18 anos, e tempo médio de tratamento de 2,53 ± 0,83 anos); G2 - Elásticos (22 pacientes tratados com aparelhos fixos e elásticos intermaxilares de Classe II, idade inicial média de 15,87 ± 5,64 anos, idade final média de 18,63 ± 5,79 anos, e tempo médio de tratamento de 2,75 ± 0,60 anos). Foram usadas telerradiografias laterais pré- e pós-tratamento. As variáveis cefalométricas foram mensuradas, e silhuetas do perfil facial foram construídas e avaliadas por 48 leigos e 63 ortodontistas, que pontuaram a atratividade entre 0 (perfil menos atraente) e 10 (perfil mais atraente). As comparações intergrupos foram realizadas com os testes Mann-Whitney e t de Student para amostras independentes. Resultados: Na fase pré-tratamento, o perfil facial no grupo Twin Force® foi menos atrativo do que no grupo Elásticos. Os tratamentos com o Twin Force® ou com Elásticos de Classe II resultaram em atratividade semelhante do perfil facial, mas a convexidade facial foi mais reduzida no grupo Twin Force®. Os ortodontistas foram mais críticos do que os leigos. Conclusões: Apesar de os tratamentos com o Twin Force® ou com Elásticos de Classe II terem resultado em atratividade semelhante do perfil facial após o tratamento, a atratividade do perfil foi reduzida com o tratamento no grupo Elásticos e melhorou no grupo Twin Force®. A convexidade facial foi mais reduzida com o tratamento no grupo Twin Force®.

Attractiveness of different esthetic orthodontic wires

ABSTRACT Objective: The aim of this study was to evaluate the attractiveness of different types of esthetic orthodontic wires by laypeople and dentists. Methods: Five different types of orthodontic wires were evaluated: three esthetic wires (Teflon-coated, epoxy resin-coated and rhodium-coated wires), and two metallic wires (stainless steel and NiTi), as control. Monocrystalline ceramic brackets were installed in the maxillary arch of a patient presenting good dental alignment. The five evaluated wires were attached to the orthodontic appliance with an esthetic silicone elastic and photographed. The photographs were evaluated by 163 individuals, 110 dentists and 53 laypeople. The data were statistically evaluated by two-way ANOVA and one-way ANOVA, followed by Tukey tests. Results: There was a statistically significant difference in the attractiveness among the wires evaluated; the most esthetic was the rhodium-coated wire, followed by the epoxy resin-coated wire and, finally, the Teflon-coated wire, with no significant difference from the stainless steel and NiTi control archwires. There was no significant difference between the groups of evaluators. Conclusion: The most attractive was the rhodium-coated wire, followed by the epoxy resin-coated wire and, finally, the least attractive wire was the Teflon-coated wire, without statistically significant difference to the stainless steel and NiTi wires, used as control.

RESUMO Objetivo: O objetivo do presente estudo foi avaliar a atratividade de diferentes tipos de fios ortodônticos estéticos, na opinião de leigos e dentistas. Métodos: Foram avaliados cinco tipos diferentes de fios ortodônticos: três fios estéticos (revestidos com teflon, revestidos com resina epóxi e revestidos com ródio) e dois fios metálicos (aço inoxidável e NiTi), como grupo controle. Braquetes de cerâmica monocristalina foram instalados na arcada superior de uma paciente com bom alinhamento dentário, e os cinco fios avaliados foram fixados ao aparelho ortodôntico com ligadura elástica estética de silicone e fotografados. As fotografias foram avaliadas por 163 indivíduos, sendo 110 dentistas e 53 leigos. Os dados foram avaliados estatisticamente pelos testes ANOVA a um e a dois critérios, seguidos pelo teste de Tukey. Resultados: Houve diferença estatisticamente significativa na atratividade entre os fios avaliados. O mais estético foi o fio revestido de ródio, seguido pelo fio revestido de resina epóxica e, finalmente, o fio revestido de teflon, sem diferença significativa entre os fios de aço inoxidável e os de NiTi. Não houve diferença significativa entre os grupos de avaliadores. Conclusão: O mais atraente foi o fio revestido de ródio, seguido pelo fio revestido de resina epóxica e, finalmente, o fio menos atraente foi o fio revestido de teflon, sem diferença estatisticamente significativa para os fios de aço inoxidável e os de NiTi, utilizados como controle.

Dental Care during COVID-19 Outbreak: A Web-Based Survey.

OBJECTIVE: This survey aimed to assess the effects of coronavirus disease 2019 (COVID-19) on elective and urgency/emergency dental care and dentists concerned. MATERIALS AND METHODS: A web-based survey was performed using Google forms questionnaire sent to dentists in Brazil. Questions included: personal information, type of dental care provided during quarantine, if emergencies increased, the dental office biosafety routine, among others. The levels of concern about the impact of quarantine on dental care and patient oral health conditions and the economic impact on dental practices were evaluated using a 0- to 10-point scale. Statistical analysis included descriptive, percentages, one-way ANOVA, Tukey, and chi-square tests. RESULTS: During quarantine, 64.6% of the dentists attended only urgency/emergency treatments, while 26.1% maintained routine appointments, and 9.3% closed the dental offices. A higher percentage of dentists from the least affected states continued routine dental treatment; dentists were younger and presented a significantly lower level of concern about dental treatments and oral health conditions of their patients. An increase in urgency/emergency procedures was reported by 44.1% of the dentists, mostly due to the unavailability of routine/elective dental care and increased patient anxiety and stress. The main causes of urgency/emergency appointments were toothache, dental trauma, and broken restorations, besides the breakage of orthodontic appliances and temporomandibular disorders. Dentists reported a high level of concern about the economic impact caused by quarantine. CONCLUSIONS: The pandemic/quarantine has negatively affected the clinical routine. Personal protection/hygiene care must be adopted and reinforced by dental professionals/staff to make dental procedures safer.

Level of satisfaction in the use of the wraparound Hawley and thermoplastic maxillary retainers.

OBJECTIVE: To compare the level of satisfaction in the use of wraparound Hawley and thermoplastic maxillary retainers. MATERIALS AND METHODS: The study sample included 70 orthodontic patients (24 males and 46 females), who were in the retention stage (mean age = 20.80 years). All patients wore the two types of maxillary retainer for 1 month each, along with a 3×3 fixed mandibular retainer. After the use of each retainer, the patients responded to a questionnaire evaluating the level of satisfaction with their use of the maxillary retainer. Intergroup comparison was performed by independent t tests. Chi-square test was used to evaluate preference for the type of retainer by gender. RESULTS: The thermoplastic retainer was better for swallowing and the wraparound Hawley appliance was better for hygiene and durability. The other factors evaluated (adaptation, speech, comfort, esthetics, satisfaction, and fitting) did not show significant differences between the retainers. There was also no significant difference in preference for the appliances. CONCLUSIONS: Regarding the overall satisfaction and the preference, there was no difference between the wraparound Hawley and thermoplastic retainers. The wraparound Hawley appliance was better in hygiene and resistance than the thermoplastic retainer; and the thermoplastic appliance was better than the wraparound Hawley for swallowing fluids and saliva.

Attractiveness of different esthetic orthodontic wires.

OBJECTIVE: The aim of this study was to evaluate the attractiveness of different types of esthetic orthodontic wires by laypeople and dentists. METHODS: Five different types of orthodontic wires were evaluated: three esthetic wires (Teflon-coated, epoxy resin-coated and rhodium-coated wires), and two metallic wires (stainless steel and NiTi), as control. Monocrystalline ceramic brackets were installed in the maxillary arch of a patient presenting good dental alignment. The five evaluated wires were attached to the orthodontic appliance with an esthetic silicone elastic and photographed. The photographs were evaluated by 163 individuals, 110 dentists and 53 laypeople. The data were statistically evaluated by two-way ANOVA and one-way ANOVA, followed by Tukey tests. RESULTS: There was a statistically significant difference in the attractiveness among the wires evaluated; the most esthetic was the rhodium-coated wire, followed by the epoxy resin-coated wire and, finally, the Teflon-coated wire, with no significant difference from the stainless steel and NiTi control archwires. There was no significant difference between the groups of evaluators. CONCLUSION: The most attractive was the rhodium-coated wire, followed by the epoxy resin-coated wire and, finally, the least attractive wire was the Teflon-coated wire, without statistically significant difference to the stainless steel and NiTi wires, used as control.

Tratamento da Má Oclusão de Classe II assimétrica com propulsor mandibular / Treatment of an asymmetrical Class II malocclusion with mandibular protraction appliance

Introduction: Class II malocclusions have several treatment protocols, and we are increasingly moving towards more conservative orthodontics, avoiding dental extractions whenever possible. A great alternative for treatment in standard II patients has been the use of mandibular protraction appliance, which promote correction of this malocclusion. In the article in question will be reported the use of the Twin Force Bite Corrector appliance in the correction of a unilateral class II. Objective: case report of malocclusion with mandibular propellant. Method: One-phase treatment with the use of a fixed orthodontic appliance associated with a fixed mandibular propulsion orthopedic appliance, Twin Force Bite Corrector (TFBC). Result and Conclusion: The treatment was able to promote the reduction of the overjet, obtaining a stable Class I molar and canine relationship with coincident midlines and the improvement of the soft tissue profile.

Introdução: As más oclusões de classe II apresentam diversos protocolos de tratamento, sendo que a cada dia mais estamos caminhando para uma ortodontia mais conservadora, fugindo sempre que possível de extrações dentárias. Uma ótima alternativa para o tratamento em pacientes padrão II tem sido o uso de propulsores mandibulares, que promovem uma correção dessa má oclusão. No artigo em questão, será relatado o uso do aparelho Twin Force Bite Corrector na correção de uma classe II unilateral. Objetivo: relato de caso de má oclusão com uso de propulsor mandibular. Método: tratamento em uma fase com a utilização de aparelho ortodôntico fixo associado a um aparelho ortopédico fixo de propulsão mandibular, Twin Force Bite Corrector (TFBC). Resultado e Conclusão: O tratamento foi capaz de promover a redução do overjet, obtenção de uma relação Classe I molar e canina estável com linhas médias coincidentes e a melhora do perfil do tecido mole.

Evaluation of the attractiveness of different gingival zeniths in smile esthetics.

OBJECTIVE: To evaluate the smile attractiveness of different gingival zeniths by general dentists, orthodontists and laypersons and the esthetic perception in the symmetric and asymmetric changes in gingival zeniths. METHODS: Posed photographs of five patients were taken and digitally manipulated in Keynote software, in the gingival zenith region, in increments of 0.5 to 1mm in maxillary central and lateral incisors, symmetrically and asymmetrically, in nine different ways for each patient. The photos were then uploaded to a website, where evaluators (general dentists, orthodontists and laypersons) could observe and vote according to their esthetic perception, scoring from 1 to 10, 1 being the least attractive and 10 the more attractive. Kruskal-Wallis and Mann-Whitney tests were used for comparison. RESULTS: Asymmetric gingival zeniths were less attractive than symmetrical gingival zeniths; gingival zenith differences greater than 1mm were perceptible in the smile attractiveness, both by laypersons, general dentists and orthodontists. When comparing maxillary central incisors with maxillary lateral incisors, the aesthetic change performed in the central incisors are more perceptible than those performed in lateral incisors, both symmetrical and asymmetrical. In a general way, orthodontists and general dentists are more critical in the evaluation and perception of gingival zenith changes, with the laypersons perceiving this change only from 1mm of maxillary right central incisor asymmetrical change. CONCLUSIONS: Asymmetric gingival zeniths are less attractive than symmetrical ones. Gingival zenith differences greater than 1mm are perceptible in the smile attractiveness. Orthodontists and general dentists are more critical in evaluating smile esthetics.

Evaluation of the attractiveness of different gingival zeniths in smile esthetics

ABSTRACT Objective: To evaluate the smile attractiveness of different gingival zeniths by general dentists, orthodontists and laypersons and the esthetic perception in the symmetric and asymmetric changes in gingival zeniths. Methods: Posed photographs of five patients were taken and digitally manipulated in Keynote software, in the gingival zenith region, in increments of 0.5 to 1mm in maxillary central and lateral incisors, symmetrically and asymmetrically, in nine different ways for each patient. The photos were then uploaded to a website, where evaluators (general dentists, orthodontists and laypersons) could observe and vote according to their esthetic perception, scoring from 1 to 10, 1 being the least attractive and 10 the more attractive. Kruskal-Wallis and Mann-Whitney tests were used for comparison. Results: Asymmetric gingival zeniths were less attractive than symmetrical gingival zeniths; gingival zenith differences greater than 1mm were perceptible in the smile attractiveness, both by laypersons, general dentists and orthodontists. When comparing maxillary central incisors with maxillary lateral incisors, the aesthetic change performed in the central incisors are more perceptible than those performed in lateral incisors, both symmetrical and asymmetrical. In a general way, orthodontists and general dentists are more critical in the evaluation and perception of gingival zenith changes, with the laypersons perceiving this change only from 1mm of maxillary right central incisor asymmetrical change. Conclusions: Asymmetric gingival zeniths are less attractive than symmetrical ones. Gingival zenith differences greater than 1mm are perceptible in the smile attractiveness. Orthodontists and general dentists are more critical in evaluating smile esthetics.

RESUMO Objetivo: avaliar a atratividade e a percepção estética do sorriso com alterações simétricas e assimétricas dos zênites gengivais, por leigos, dentistas e ortodontistas. Métodos: foram tiradas fotografias posadas de cinco pacientes, de forma padronizada. Cada fotografia foi digitalmente manipulada no software Keynote, na região do zênite gengival, em incrementos de 0,5 a 1 mm, nos incisivos centrais e laterais superiores, de maneira simétrica e assimétrica, de nove formas diferentes para cada paciente. Posteriormente, essas fotografias foram dispostas em um website para que os avaliadores pudessem observá-las e, conforme sua percepção estética, dessem notas de 1 a 10, sendo 1 para pouco atrativa e 10 para muito atrativa. Foram utilizados os testes Kruskal-Wallis e Mann-Whitney para as comparações. Resultados: os zênites gengivais assimétricos foram considerados menos atrativos do que os simétricos. Diferenças entre os zênites gengivais maiores que 1 mm foram perceptíveis na atratividade do sorriso por todos os grupos de avaliadores. Quando comparados os incisivos centrais e laterais superiores, as alterações estéticas feitas nos incisivos centrais foram mais perceptíveis do que as feitas nos laterais, tanto as simétricas quanto as assimétricas. Os ortodontistas e os clínicos gerais foram mais críticos ao avaliar e perceber as alterações, com os leigos percebendo essa mudança somente a partir de 1 mm de alteração assimétrica no incisivo central superior direito. Conclusões: zênites gengivais assimétricos são menos atrativos do que os simétricos. Diferenças nos zênites maiores que 1 mm são perceptíveis na atratividade do sorriso. Ortodontistas e clínicos gerais são mais críticos ao avaliar sorrisos.

Overjet, overbite, and anterior crowding relapses in extraction and nonextraction patients, and their correlations.

INTRODUCTION: In this study, we aimed to compare the relapse of maxillary and mandibular anterior crowding, overjet, and overbite 5 years after treatment in subjects with Class I and Class II malocclusions treated with and without extractions, and also to evaluate the correlations among these factors. METHODS: The sample comprised 84 subjects with Class I and Class II malocclusions, treated with and without extractions. Group 1 comprised 44 subjects with an initial mean age of 12.96 years treated without extractions. Group 2 included 40 subjects with an initial mean age of 13.01 years treated with 4 premolar extractions. Data were obtained from dental casts at the pretreatment, posttreatment, and long-term posttreatment stages. Intergroup comparisons were performed with t tests. To verify the correlations among the relapse of overjet, overbite, and anterior crowding, the Pearson correlation test was used. RESULTS: Maxillary incisor irregularity and its relapse in the nonextraction group were significantly greater at the long-term posttreatment stage and the long-term posttreatment period, respectively. Long-term postreatment overjet changes were similar in the groups. Overbite and its relapse were significantly greater in the extraction group in the long-term posttreatment stage and period, respectively. There was a positive correlation of the relapse of mandibular incisor crowding with the relapse of overjet and overbite, and also a correlation of overjet and overbite relapses. CONCLUSIONS: There was greater maxillary crowding relapse in the nonextraction group and greater overbite relapse in the extraction group. There were significant and positive correlations of overjet and overbite relapses with mandibular anterior crowding relapse and consequently between overjet and overbite relapses.

Comparação clínica da efetividade da colagem dos braquetes ortodônticos com duas resinas fotopolimerizáveis / Clinical comparison of the effectiveness of orthodontic brackets bonding with two light-activated resins

Objetivo: o presente estudo objetivou comparar a proporção de descolagem de acessórios ortodônticos da superfície do esmalte de dentes colados com resina Transbond XT e Fill Magic Ortodôntico. Métodos: a amostra foi composta por 17 pacientes que iniciaram o tratamento ortodôntico na clínica da Faculdade Ingá e foram acompanhados durante 7 meses. Os braquetes foram colados de segundo pré-molar a segundo pré-molar do lado oposto, em ambas as arcadas (sendo o lado direito com resina Transbond XT e o lado esquerdo com resina Fill Magic Ortodôntico), totalizando 340 braquetes colados, 170 com cada tipo de sistema adesivo. O índice de quebra das duas resinas avaliadas foi comparado pelo teste qui-quadrado. Resultados: os resultados obtidos demonstraram que os braquetes colados com a resina Transbond XT, ao longo dos 7 meses de avaliação, apresentaram 4 quebras em 3 braquetes, sendo que 1 deles quebrou 2 vezes; já a Fill Magic ortodôntico, nos 7 meses de avaliação, apresentou 19 quebras em 17 braquetes, sendo que 2 braquetes quebraram por 2 vezes. Conclusão: o sistema adesivo Transbond XT apresentou melhor retenção do que o sistema adesivo Fill Magic ortodôntico, com diferenças significativas.

Avaliação da correlação da recidiva da sobressaliência e de sobremordida do apinhamento anterior em casos tratados com extrações / Evaluation of the correlation of the overjet and overbite relapse with the relapse of anterior crowding in extraction cases

Tendo em vista a imprevisibilidade da estabilidade oclusal pós correção ortodôntica, este estudo objetivou correlacionar a recidiva da sobremordida e da sobressaliência com a recidiva do apinhamento ântero-superior e ântero-inferior, em casos com má oclusão de Classe I e Classe II de Angle, tratados ortodonticamente com extração de 4 pré-molares, tratados pela técnica Edgewise. Para isso, foram selecionados 40 pacientes (20 do gênero feminino e 20 do gênero masculino), 25 pacientes portadores de má oclusão de Classe I e 15 de Classe II de Angle, com idade média inicial de 13,01 anos, que foram tratados por um tempo médio de 2,15 anos, e avaliados na fase pós-contenção após um período médio de 5,43 anos. Todos os pacientes apresentavam pelo menos 3 mm de sobremordida e 4mm de sobressaliência ao início do tratamento ortodôntico. Foram utilizados os modelos de gesso das fases do início do tratamento (T1), final de tratamento (T2) e da fase pós-contenção, em média 5 anos após o término do tratamento (T3) de todos os casos selecionados para que fossem quantificadas as recidivas dessas duas variáveis, assim como a recidiva do apinhamento anterior. Utilizou-se a análise de variância a um critério de seleção, e em caso de resultado significante, o teste de Tukey, para comparação intragrupos dos 3 tempos avaliados. Para verificação da presença de correlação entre a recidiva da sobressaliência e da sobremordida, com o apinhamento anterior, utilizou-se o teste de correlação de Pearson. A comparação intergrupos foi realizada por meio do teste t independente. Os resultados mostraram que houve uma correção significante do trespasse horizontal, vertical e apinhamento com o tratamento. Não houve uma recidiva significante do trespasse horizontal, vertical e do apinhamento ântero-superior no período pós-contenção, ao contrário do apinhamento ântero-inferior, que apresentou uma recidiva significante. Houve correlação significante da recidiva do trespasse horizontal...

Due to the unpredictability of the occlusal stability after orthodontic correction, this study aimed to correlate the relapse of overbite and overjet with the relapse of maxillary and mandibular anterior crowding, in cases of Class I and Class II malocclusions, treated orthodontically with four premolars extraction and Edgewise technique. For this, 40 patients were selected (20 females and 20 males), 25 patients with Class I malocclusion and 15 with Class II, with initial age of 13.01 years, which were treated for a mean period of 2.15 years, and evaluated postretention after a mean period of 5.43 years. All patients had at least 3mm of overbite and 4mm of overjet at the beginning of orthodontic treatment. The dental casts from pretreatment (T1), posttreatment (T2) and postretention, on average 5 years after completion of treatment (T3), were used. It was used the one-way ANOVA, and in case of a significant result, Tukey's tests were used for intragroup comparison of the three times evaluated. To verify the presence of correlation between the relapse of overjet and overbite, with the relapse of anterior crowding, the Pearsons correlation test was used. Intergroup comparison was performed with independent t tests. The results showed a significant correction of the overjet, overbite and crowding during treatment. There was not a significant postretention relapse of overjet, overbite and crowding of the maxillary anterior segment, unlike the mandibular anterior crowding, which presented a significant relapse. There was a significant correlation of relapse of the overjet with the relapse of the overbite. No significant correlation between relapse of overjet and relapse of anterior crowding. There was no correlation between relapse of the overbite and relapse of anterior crowding, and there was also no correlation between mandibular anterior crowding relapse and maxillary anterior crowding relapse. There were differences between groups only for the mandibular...

Avaliação da correlação da recidiva da sobressaliência e de sobremordida do apinhamento anterior em casos tratados com extrações / Evaluation of the correlation of the overjet and overbite relapse with the relapse of anterior crowding in extraction cases

Tendo em vista a imprevisibilidade da estabilidade oclusal pós correção ortodôntica, este estudo objetivou correlacionar a recidiva da sobremordida e da sobressaliência com a recidiva do apinhamento ântero-superior e ântero-inferior, em casos com má oclusão de Classe I e Classe II de Angle, tratados ortodonticamente com extração de 4 pré-molares, tratados pela técnica Edgewise. Para isso, foram selecionados 40 pacientes (20 do gênero feminino e 20 do gênero masculino), 25 pacientes portadores de má oclusão de Classe I e 15 de Classe II de Angle, com idade média inicial de 13,01 anos, que foram tratados por um tempo médio de 2,15 anos, e avaliados na fase pós-contenção após um período médio de 5,43 anos. Todos os pacientes apresentavam pelo menos 3 mm de sobremordida e 4mm de sobressaliência ao início do tratamento ortodôntico. Foram utilizados os modelos de gesso das fases do início do tratamento (T1), final de tratamento (T2) e da fase pós-contenção, em média 5 anos após o término do tratamento (T3) de todos os casos selecionados para que fossem quantificadas as recidivas dessas duas variáveis, assim como a recidiva do apinhamento anterior. Utilizou-se a análise de variância a um critério de seleção, e em caso de resultado significante, o teste de Tukey, para comparação intragrupos dos 3 tempos avaliados. Para verificação da presença de correlação entre a recidiva da sobressaliência e da sobremordida, com o apinhamento anterior, utilizou-se o teste de correlação de Pearson. A comparação intergrupos foi realizada por meio do teste t independente. Os resultados mostraram que houve uma correção significante do trespasse horizontal, vertical e apinhamento com o tratamento. Não houve uma recidiva significante do trespasse horizontal, vertical e do apinhamento ântero-superior no período pós-contenção, ao contrário do apinhamento ântero-inferior, que apresentou uma recidiva significante. Houve correlação significante da recidiva do trespasse horizontal...

Due to the unpredictability of the occlusal stability after orthodontic correction, this study aimed to correlate the relapse of overbite and overjet with the relapse of maxillary and mandibular anterior crowding, in cases of Class I and Class II malocclusions, treated orthodontically with four premolars extraction and Edgewise technique. For this, 40 patients were selected (20 females and 20 males), 25 patients with Class I malocclusion and 15 with Class II, with initial age of 13.01 years, which were treated for a mean period of 2.15 years, and evaluated postretention after a mean period of 5.43 years. All patients had at least 3mm of overbite and 4mm of overjet at the beginning of orthodontic treatment. The dental casts from pretreatment (T1), posttreatment (T2) and postretention, on average 5 years after completion of treatment (T3), were used. It was used the one-way ANOVA, and in case of a significant result, Tukey's tests were used for intragroup comparison of the three times evaluated. To verify the presence of correlation between the relapse of overjet and overbite, with the relapse of anterior crowding, the Pearsons correlation test was used. Intergroup comparison was performed with independent t tests. The results showed a significant correction of the overjet, overbite and crowding during treatment. There was not a significant postretention relapse of overjet, overbite and crowding of the maxillary anterior segment, unlike the mandibular anterior crowding, which presented a significant relapse. There was a significant correlation of relapse of the overjet with the relapse of the overbite. No significant correlation between relapse of overjet and relapse of anterior crowding. There was no correlation between relapse of the overbite and relapse of anterior crowding, and there was also no correlation between mandibular anterior crowding relapse and maxillary anterior crowding relapse. There were differences between groups only for the mandibular...