Effect of time and photoactivated face on bond strength of brackets and on degree of monomer conversion.

OBJECTIVE: To evaluate the effect of four different photoactivation protocols (according to "photoactivated faces" - mesial/distal, cervical/incisal or center - and "photoactivation time" - 6-3 s) of a high-power photo activator (Valo Cordless®-Ultradent) on the shear bond strength (SBS) between metal brackets and dental enamel and on the degree of conversion (DC) of an orthodontic resin. MATERIALS AND METHODS: 40 bovine incisor crowns were randomly assigned to 4 groups (n = 10). The brackets were bonded with Transbond XT® resin using 4 protocols according to the "photoactivation protocol" factor (which was subdivided into photoactivated faces and photoactivation time): V3C = 3 s + center; V6C = 6 s + center; V3M3D = 3 s on mesial + 3 s on distal; V3C3I = 3 s on cervical + 3 s on incisal. All the samples were stored for 4 months (water,37ºC) and then subjected to a SBS test (100KgF,1 mm/min). 40 resin discs were made to evaluate the monomer degree of conversion. Data from the SBS and DC were assessed by One-way ANOVA and Tukey's test (5%). Bond failures were analyzed according to the Adhesive Remnant Index (ARI) and evaluated by the Kruskal-Wallis test (5%). RESULTS: There was a statistically significant difference (p = 0.008) in the One-way ANOVA result for SBS values between all groups, but the protocols showed statistically similar results (p ≥ 0.05-Tukey's tests) concerning the photoactivated faces (V6C, V3M3D and V3C3I) and photoactivation time (V3C and V6C) factors individually. There was no statistically significant difference (p ≥ 0.05) in the One-way ANOVA result for DC values. CONCLUSION: The SBS and DC values will vary depending on the protocol applied. CLINICAL RELEVANCE: It is possible to maintain the bracket fixation quality with the use of a high-power LED photo activator associated with a shorter photoactivation time. However, it is assumed that not all types of protocols that might be applied will provide quality bonding, such as V3C, V3M3D and V3C3I, which may - depending on the SBS and DC values - affect the final treatment time, due to brackets debonding, or increase of possibility of damage to dental enamel during bracket removal. Clinical studies are suggested to confirm the hypotheses of this research.

Association between molar-incisor hypomineralisation and dental anomalies.

BACKGROUND: Common etiological factors have been reported in the development of molar-incisor hypomineralisation (MIH) and dental anomalies (DA). AIM: To assess the association between MIH and DAs. DESIGN: A cross-sectional study was performed to evaluate the presence of MIH and other six DAs in a sample of 415 pretreatment records from patients aged 9-18 years. Statistical analyses were performed using the chi-squared and Fisher's exact tests, and logistic regressions. RESULTS: There was statistically significant association between the prevalence of DAs and MIH (CI: 1.43-2.43, φ-coefficient: 0.204, PR: 1.87). Higher percentage of tooth agenesis (CI: 1.37-1.68, φ-coefficient: 0.271, PR: 1.50), maxillary premolar agenesis (CI: 1.70-3.65, φ-coefficient: 0.125, PR: 2.49), mandibular second premolar agenesis (CI: 1.68-3.16, φ-coefficient: 0.172, PR: 2.30) and distoangulation of the mandibular second premolars (CI: 1.31-3.47, φ-coefficient: 0.103, PR: 2.13) was observed among children who had MIH-affected teeth. Individuals with MIH had a 2.95 times greater chance of having DAs (R2 = .153). The number of patients with DAs was higher when the first molar showed severe defects (OR = 4.47; R2 = .149). CONCLUSION: There is a weak association between MIH and DAs. Patients with severe MIH lesions have a slightly higher risk of presenting DAs.

The 100 most-cited articles in orthodontic journals in the last 20 years.

INTRODUCTION: This study aimed to identify and analyze the 100 most-cited articles published in orthodontic scientific journals in the past 21 years. METHODS: The research was conducted in the Thomson Reuters Web of Science data citation index, considering articles from 2000 to 2020 and the category of dentistry, oral surgery, and medicine. Information about the number of citations, citations per year, title, authors, year of publication, the title of scientific journals, type of study, keywords, and thematic field were extracted for each article. Descriptive statistical analyses were performed to evaluate the collected data. The Pearson correlation analysis was used to explore the relationship between publication and the number of citations received. The VOSviewer software (Leiden University Center for Science and Technology Studies, Leiden, the Netherlands) was used to generate the keyword cooccurrence network. RESULTS: The number of citations of the 100 selected articles ranged from 122 to 547. The journal with the largest number of cited articles was the American Journal of Orthodontics and Dentofacial Orthopedics. Most of the papers were cross-sectional and longitudinal studies, and the most frequent thematic fields among the selected articles were anchorage, root resorption, and rapid maxillary expansion. Orthodontic treatment, anchorage, and root resorption were the most frequent keywords. CONCLUSIONS: Bibliometric analysis of citations revealed a greater centralization of orthodontic studies. Most of the articles were published in a single journal and by one country. Anchorage is a trending topic in orthodontics, and cross-sectional and longitudinal studies are the most-cited types of papers.

Prevalência das lesões de mucosa bucal e seu impacto na qualidade de vida de escolares / Prevalence of mucosa injuries and its impact on the quality of life of schools

Objetivo:Avaliar a prevalência das lesões de mucosa bucal e seu impacto na qualidade de vida relacionada à saúde bucal em crianças matriculadas nas escolas municipais de Caicó, Rio Grande do Norte (RN). Métodos:Foram selecionados 71 escolares entre 8 a 10 anos de idade regularmente matriculados em Escolas Municipais de Caicó/RN. A amostra foi divida em dois grupos: Grupo lesão (GL): composto por 26 crianças com presença de lesões bucais e Grupo controle (GC): composto por 45 crianças que não apresentaram lesões bucais. A identificação das lesões bucais se deu pelo exame clínico com o auxílio de espátulas de madeira. As crianças responderam questionários (CPQ8-10) acerca da qualidade de vida relacionada à saúde bucal. Foi realizada a comparação intergrupos para a avaliação da qualidade de vida e seus componentes por meio do teste t. Em todos os testes foram adotados níveis de significância de 5%. Resultados:A prevalência de crianças que apresentaram lesão de mucosa foi igual a 36,61%, (n = 26). Os tipos mais comuns de lesões foram úlceras aftosas 23,94% (n = 17) e mucocele com 5,63% (n = 4). Houve diferença estatisticamente significante para qualidade de vida entre os grupos avaliados. Pacientes sem lesões bucais apresentaram uma melhor qualidade de vida em detrimento ao grupo das lesões (p = 0,045). Conclusão: Lesões bucais causam um impacto negativo na qualidade de vida relacionada à saúde bucal em crianças de 8 a 10 anos.

Aim: To evaluate the prevalence of oral mucosa lesions and their impact on oral health-related quality of life in children enrolled in the city schools of Caicó, Rio Grande do Norte (RN), Brazil. Methods: Seventy-one schoolchildren, from 8 to 10 years of age, regularly enrolled in the Caicó/RN City School System, were selected. The sample was divided into two groups: the Injury Group (IG): comprised of 26 children with oral lesions and the Control Group (CG): comprised of 45 children who did not present oral lesions. Oral lesions were identified by clinical examination with the aid of wooden spatulas. The children answered questionnaires (CPQ8-10) about oral health-related quality of life. Intergroup comparison was performed to assess the quality of life and its components by the Student's t-test. In all tests, significance levels of 5% were adopted. Results: The prevalence of children with mucosal lesions was 36.61% (n = 26). The most common types of lesions were aphthous ulcers, at 23.94% (n = 17), and mucocele, at 5.63% (n = 4). A statistically significant difference was observed in the quality of life correlation between the evaluated groups. Patients without oral lesions had a better quality of life than did the group of lesions (p = 0.045). Conclusion: Oral lesions have a negative impact on the oral health-related quality of life in children from 8 to 10 years of age.

Aceitação dos pacientes de diferentes protocolos de extração dentária ortodôntica / Patients' acceptance of different orthodontic tooth extraction protocols

Resumo Objetivo: Avaliar a aceitação dos pacientes de diferentes protocolos de extração dentária ortodôntica como uma opção de tratamento para a má oclusão de Classe II. Material e Métodos: Pacientes adultos em busca de tratamento ortodôntico foram solicitados a preencher um questionário relacionado à aceitação de extração de pré-molares. A amostra foi dividida em 2 grupos: 30 pacientes que não precisaram de extrações de pré-molares e 30 pacientes que precisaram ter seus pré-molares extraídos. Resultados: Pacientes que tiveram um planejamento de tratamento incluindo extrações de pré-molares pareceram se preocupar mais com a necessidade de extrações, mas não houve diferença entre a aceitação dos diferentes protocolos de extração, quando os grupos foram comparados. Conclusão: A aceitação pelos pacientes dos protocolos de extração dentária ortodôntica é alta, independente se for necessária ou não. (AU)

Abstract Objective: To evaluate patients' acceptance of different orthodontic tooth extraction protocols as a treatment option to Class II malocclusion. Materials and Methods: Adult patients seeking orthodontic treatment were asked to fill out a questionnaire related to premolars extraction acceptance. The sample was divided into 2 groups: 30 patients who didn't need premolars extractions and 30 patients who needed to have premolars extracted. Results: Patients who had a planning treatment including premolars extractions seemed to be more worried about the extraction need, but there was no difference between the acceptance of different protocols of extraction when groups were compared. Conclusion: Patient's acceptance of orthodontic tooth extraction protocols is high, regardless if it is necessary or not.(AU)