Validation of a new experimental model of extrusive luxation on maxillary molars of rats: a histological study.

BACKGROUND/AIM: The aim of this study was to test and validate a new model of extrusive luxation trauma on maxillary first molars of rats. MATERIAL AND METHODS: Forty adult male rats (Rattus norvegicus albinus, Wistar; weight = 230-250 g), 45 days old, were divided into eight groups (n = 5): control groups, in which animals were not subjected to any procedure and waited 1 day (GC1D) or 3 days (GC3D) for euthanasia, and experimental groups, in which animals were subjected to forces of 1100cN, 1300cN, or 1500cN and waited 1 or 3 days for euthanasia (GT1100/1D, GT1100/3D, GT1300/1D, GT1300/3D, GT1500/1D, GT1500/3D). In animals of the experimental groups, trauma was produced by an extrusive force in maxillary first right molars. Four-micrometer serial cuts stained with hematoxylin and eosin (HE) were made. Descriptive microscopic analysis of first upper right molar and semi-quantitative analysis (scores 1 to 4) of intensity of acute and chronic inflammation and vascular changes in the periodontal ligament and active and inactive external root resorption were conducted. The distribution of scores in the groups was compared using the Freeman-Halton extension of Fisher's exact test. The significance level was 5%. RESULTS: It was observed that vascular disorders (bleeding) on the periodontal ligament became more evident with increasing extrusive force. CONCLUSIONS: This new method was capable of generating histological changes, proving its secure application in this research area. The 1500cN force produced more damage on the periodontal ligament. CLINICAL RELEVANCE: The validation of a new experimental method can produce more reliable evidence in further research.

Effect of a single-tufted toothbrush on the control of dental biofilm in orthodontic patients: A randomized clinical trial.

OBJECTIVE: To compare the effect of a single-tufted toothbrush combined or not with a conventional toothbrush to control dental biofilm in healthy orthodontic patients. MATERIALS AND METHODS: Twenty orthodontic patients were randomly assigned to receive three different treatments: Group 1-conventional toothbrush; Group 2-single-tufted toothbrush and Group 3-combination of single-tufted and conventional toothbrushes. Stained plaque index (SPI), visible plaque index (VPI) and gingival bleeding index (GBI) were recorded. The data were analysed by Kolmogorov-Smirnov test. Wilcoxon test was used for intragroup comparison and Friedman test for the intergroup comparison (α = 5%). RESULTS: Intragroup analysis showed that VPI and SPI significantly decreased (P < 0.05) after 72 hour in Group 3. Anterior and posterior teeth did not show any significant statistical differences after 72 hour (P > 0.05), but VPI values in the labial surfaces were different to Group 3 (P < 0.05) in comparison with the other groups after 72 hour. Group 3 showed a statistically significant reduction (P < 0.05) for SPI in the interproximal surfaces when compared with Group 1. CONCLUSION: The combination of single-tufted and conventional toothbrushes was effective for controlling dental biofilm formation in orthodontic patients.

Effects of conventional and orthodontic pacifiers on the dental occlusion of children aged 24-36 months old.

AIM: To investigate the effects of conventional and orthodontic pacifiers on the prevalence of malocclusion (MO) considering frequency, duration, and intensity of the sucking habit. DESIGN: Data were collected at three time-points: birth, T1; (12-24 months old), T2; (24-36 months old), T3 and were divided into three groups: control (GC; 110), without non-nutritive sucking habits; orthodontic pacifiers (GOrth; 55); conventional pacifiers (GConv; 55). A questionnaire was applied. Clinical examination was performed at T3. The groups were compared as to the prevalence and severity of anterior open bite (AOB), accentuated overjet, anterior crossbite, posterior crossbite (PCB). RESULTS: The use of pacifiers was associated with occurrence of MO compared to GC (P < 0.05). Frequency, intensity, and duration of pacifier use was also associated with of MO. There was significant difference in the prevalence of MO between GConv and GOrth for AOB (P = 0.027). Only GConv exhibited higher odds of PCB compared to GC (P = 0.040). The prevalence of MO was significantly higher in pacifiers users (P < 0.001). CONCLUSION: The prevalence of MO was higher among children who used pacifiers. According to a general trend, the use of conventional pacifiers was associated to severe anterior open bite and overjet.

Two-Year Follow-up of Multidisciplinary Treatment Using Digital Smile Design as a Planning Tool for Esthetic Restorations on Maxillary Midline Diastema.

One of the challenges posed by diastema closure treatment in the presence of tooth size discrepancy is to achieve adequate distribution of the spaces between the teeth. The use of the Digital Smile Design can assist the clinician in visualizing and measuring dentogingival discrepancies with maximum predictability. The present clinical case describes an approach to space distribution with assistance of the digital tool, allowing adequate restorative procedures. The protocol used was shown to be efficient, achieving the esthetics desired by the patient both during and after multidisciplinary treatment, as well as having adequate stability.

Influence of Neonatal Ankyloglossia on exclusive breastfeeding in the six first months of life: a cohort study. / Influência da Anquiloglossia neonatal na amamentação exclusiva nos seis primeiros meses de vida: estudo de coorte.

PURPOSE: To analyze the influence of ankyloglossia on the prevalence and duration of exclusive breastfeeding of full-term infants up to the sixth month of life. METHODS: Prospective cohort study, carried out with 225 mother-infant dyads who were followed up in the first six months of life in a center specialized in breastfeeding in a tertiary hospital. Full-term infants with asymptomatic ankyloglossia (no need for surgery) were compared with infants without change at monthly follow-up. Ankyloglossia was diagnosed using the Bristol Tongue Assessment Tool, with a positive diagnosis being considered for those with a score less than or equal to 5 considering functional and anatomical aspects. Statistical analyzes were performed using descriptive statistics, logistic regression (weaning determinants), relative risk, and survival curves (to analyze breastfeeding duration between groups with and without ankyloglossia). RESULTS: Ankyloglossia was associated with weaning (considered even partial) before the sixth month of life. After adjusted analysis, a higher risk of weaning was detected in infants with this alteration, with a risk present from the second month of life. In the survival analysis, the duration of breastfeeding in infants with ankyloglossia was shorter when compared to children without alterations. CONCLUSION: Compared to infants with normal lingual frenulum, babies with ankyloglossia had shorter exclusive breastfeeding time, but well above the average observed in the general population. The risk of weaning for this group was also higher.

OBJETIVO: Analisar a influência da anquiloglossia na prevalência e no tempo de exclusividade do aleitamento materno de lactentes a termo até o sexto mês de vida. MÉTODOS: Estudo de coorte prospectivo, realizado com 225 díades mãe-bebê que foram acompanhadas nos seis primeiros meses de vida em centro especializado em amamentação em um hospital terciário. Lactentes a termo com anquiloglossia do tipo assintomática (sem necessidade de cirurgia) foram comparados com lactentes sem alteração em um acompanhamento mensal. O diagnóstico de anquiloglossia foi realizado através do Bristol Tongue Assessment Tool, sendo considerados com diagnóstico positivo aqueles com escore menores ou iguais a 5 considerando os aspectos funcionais e anatômicos. As análises estatísticas foram realizadas através de estatística descritiva, regressão logística (determinantes do desmame), risco relativo e curvas de sobrevivência (para analisar o tempo de aleitamento entre os grupos com e sem anquiloglossia). RESULTADOS: A anquiloglossia esteve associada com o desmame (considerado ainda que parcial) antes do sexto mês de vida. Após análise ajustada, foi detectado maior risco de desmame nos lactentes com a alteração presente, com risco presente a partir do segundo mês de vida. Na análise de sobrevida, o tempo de aleitamento nos lactentes com anquiloglossia foi menor quando comparadas às crianças sem alteração. CONCLUSÃO: Em comparação com lactentes com freio lingual normal, os bebês com anquiloglossia apresentaram tempo menor de aleitamento exclusivo, porém bem acima da média observada na população geral. O risco de desmame para este grupo também foi maior.

Microscopic evaluation of induced tooth movement in traumatized teeth: an experimental study in rats.

The clinical management of orthodontic patients with dental trauma before or during the treatment is mainly founded on clinical experience, expert opinions, and individual case reports. It is proposed in the literature that teeth sustaining mild trauma with minor damage to the periodontium (e.g. subluxation) should be followed for a period of time before being subjected to orthodontic forces. A minimum period of 3 months has been proposed. In this study, we used an animal model to investigate whether shorter observation periods could be established in case of mild trauma. The periradicular region of rat molars was examined microscopically to determine the biological events of tooth movement started 15 and 30 days after intentional subluxation using an experimental method to induce dentoalveolar trauma. Thirty adult male Wistar rats were assigned to 6 groups (n = 5): Group 1 (control - no trauma/orthodontic movement); Group 2: the animals received an orthodontic device and were sacrificed after 7 days; Groups 3 and 4: dentoalveolar trauma (subluxation) was experimentally induced by the application of an axial force of 900 cN on the occlusal surface of the maxillary right first molar, and the animals were sacrificed after 22 and 37 days, respectively; and Groups 5 and 6: 15 and 30 days, respectively, after force application, an orthodontic device was installed and the rats were sacrificed 7 days later. In G5 and G6, the periodontal ligament and pulp tissue were rich in cellular elements and blood vessels, the alveolar bone was preserved, and the root surface presented only very small areas of surface resorption (cementum), maintaining the characteristics of normality. In conclusion, the microscopic alterations in the gingival and periodontal tissues in response to an experimentally induced mild dentoalveolar trauma simulating subluxation were not sufficient to contraindicate starting the orthodontic movement 15 and 30 days after trauma.

Does neonatal ankyloglossia interfere in the growth of infants during the first 6 months of life? A case series nested in a cohort study.

BACKGROUND: Ankyloglossia is commonly reported as one of the major causes of breastfeeding difficulty. There is a lack of research on infant growth and latching performance with clinical measures. CASES PRESENTATION: We describe a series of eight clinical cases (three female and five male infants) in a specialized breastfeeding center in a tertiary hospital in Northeast Brazil. The mothers were of mixed race and ranged from 13 to 41 years of age. Ankyloglossia was diagnosed within the first 48 hours after delivery. We measured the standards of growth, the mothers' perception of breastfeeding, and a pain indicator, and performed an assessment of breastfeeding. The regularity of breastfeeding was maintained despite the early diagnosis of ankyloglossia. Growth indicators were not affected in the sixth month in any of the babies, with only one measuring below expectations in the third month, with no impact on general health. CONCLUSIONS: In the cases reported in this paper, the infants overcame the initial difficulties in breastfeeding and maintained their normal growth course in the first 6 months of life.

Orthodontic Movement of Central Incisor with Previously-healed Root Fracture associated with Unerupted Canines.

Teeth with root fracture may need orthodontic treatment. This case report presents the management of unerupted canines in a patient with previously-healed/untreated horizontal root fracture in the maxillary left central incisor. The malocclusion was treated maintaining pulp vitality considering the principles to improve the eruption path of maxillary canines and move short-rooted teeth. The root-fractured tooth remained symptomless after orthodontic treatment without significant adverse effects, and stayed stable following 2-year follow-up.

Alterations of oral functions and dental malocclusions in adolescents: a cross-sectional population-based study.

This article aims to assess whether alterations of oral functions (AOF) are associated with malocclusion (MO)'s type and severity. Cross-sectional study of a representative sample of 332 adolescents aged 12 years in São Luís-MA, Northeastern Brazil. MO criteria included Angle's classification, Dental Aesthetic Index, and other morphological problems. The AOF were evaluated by breathing, phonation, chewing, and swallowing. Odds ratios (OR) and 95% confidence intervals (95%CI) were calculated using logistic and multinomial regression analyses (α=5%). Mouth breathing was associated with defined (OR=3.84; 95%CI=1.45-10.12), disabling (OR=4.34; 95%CI=1.99-9.49), and class III (OR=4.15; 95%CI=1.19-14.54) MO. Phonation problems were associated with defined (OR=2.01; 95%CI=1.02-4.39), disabling (OR=3.04; 95%CI=1.55-5.96), and Class II (OR=2.02; 95%CI=1.28-3.18) MO. Chewing disorders were associated with posterior crossbite (PCB) (OR=2.32; 95%CI=1.12-4.82). Swallowing disorders were associated with Class III MO (OR=5.66; 95%CI=1.35-23.71), PCB (OR=6.13; 95%CI=2.76-13.62), and posterior open bite (OR=4.53; 95%CI=1.72-8.92). Breathing and phonation alterations are associated with MO in anterior arch segments, while chewing and swallowing disorders, in the posterior segments.

Histological evaluation of experimentally induced subluxation in rat molars and its implications on the management of orthodontic treatment.

The purpose of this study was to evaluate the histological alterations occurred in the periradicular region of rat molars after intentional subluxation using an experimental method to induce dentoalveolar trauma. Eighteen adult male Wistar rats (Rattus norvegicus albinus) were selected for the study. The dentoalveolar trauma was experimentally induced by the application of an occlusogingival force on the occlusal surface of the maxillary right first molar using a tensiometer secured on a fully articulated support with adjustable steel shafts. The animals were assigned to six groups (n = 3), according to the intensity of the force applied to induce trauma: Group I (GI, control) - no force application; Groups II-VI (GII-GVI) - the animals were subjected to 600, 700, 800, 900 and 1000 cN force, respectively. After experimental induction of trauma, the animals were sacrificed by anesthetic overdose and the right maxillas were removed and processed for histological analysis under light microscopy. In the animals of GII, GIII and GIV, the histological alterations were similar to those described for GI. GVI (1000 cN) presented the most severe alterations, with the occurrence of buccal bone plate fracture, alveolar fracture and root fracture, which are not present in mild traumatic injuries like subluxation. The 900 cN force (GV) was capable to produce clinical and histological alterations in the gingival and periodontal tissues compatible with those observed in subluxation.

Ankyloglossia severity in infants: maternal pain, self-efficacy, and functional aspects of breastfeeding / Gravidade da anquiloglossia em bebês: dor materna, autoeficácia e aspectos funcionais do aleitamento materno

ABSTRACT Objective: To analyze functional aspects of breastfeeding, self-efficacy, and pain reported by mothers during breastfeeding, in newborns with severe and mild ankyloglossia. Methods: This is an observational study, carried out with 81 babies with ankyloglossia, assessed by the Bristol Tongue Assessment Tool (severe: scores 0-3; mild: scores 4-6) nested in a cohort carried out at the University Hospital of the Federal University of Maranhão, São Luis, Brazil. The functional aspects of breastfeeding were analyzed using the Breastfeeding Observation Form of the United Nations Children's Fund (BOF-UNICEF) and the LATCH Scoring System. Breastfeeding self-efficacy was measured using the Breastfeeding Self-Efficacy Scale — Short-Form. Pain indicators were evaluated by the Short-Form McGill Pain Questionnaire. The significance level adopted was 5%. Results: Maternal age was 26.7±0.8 years, and 64.2% reported high school education. Most babies were male (67.9%), and the birth weight was 3232±60g. A significant association was detected in the sucking aspect evaluated by the BOF-UNICEF [β=0.22 (95%CI 0.07; 0.73), p-value=0.013]. However, the groups did not differ in the assessment of breastfeeding performed by the LATCH scale. The groups had no differences in the assessment of breastfeeding self-efficacy reported by mothers, and in pain scores. Conclusions: Despite the observation of sucking difficulty in infants with severe ankyloglossia., the quality of breastfeeding in general, maternal pain, and self-efficacy reported by mothers do not differ when compared with infants with mild ankyloglossia. Therefore, the severity of ankyloglossia seems not to affect the breastfeeding indicators.

RESUMO Objetivo: Analisar aspectos funcionais da amamentação, autoeficácia e dor relatada pelas mães durante a amamentação, em recém-nascidos com anquiloglossia grave e leve. Métodos: Estudo observacional, realizado com 81 bebês diagnosticados com anquiloglossia avaliados pelo Bristol Tongue Assessment Tool (grave: escores 0-3; leve: escores: 4-6), aninhados em um estudo de coorte realizado no Hospital Universitário da Universidade Federal do Maranhão, São Luís, Brasil. Os aspectos funcionais do aleitamento materno foram analisados por meio do Formulário de Observação da Amamentação do Fundo Internacional para a Infância das Nações Unidas (BOF-UNICEF) e da Escala LATCH. Aautoeficácia foi mensurada por meio da Breastfeeding Self-Efficacy Scale — Short-Form. Os indicadores de dor foram avaliados pelo Short-Form McGill Pain Questionnaire. O nível de significância adotado foi de 5%. Resultados: A idade materna foi 26,7±0,8 anos, e 64,2% concluíram o ensino médio. A maioria dos recém-nascidos era do sexo masculino (67,9%), e o peso ao nascer foi 3232±60g. Foi detectada associação significante no aspecto da sucção avaliado pelo BOF-UNICEF [β=0,22 (IC95% 0,07; 0,73), p=0,013]. No entanto, os grupos não diferiram na avaliação do aleitamento materno realizada pela escala LATCH. Os grupos não apresentaram diferenças na avaliação da autoeficácia em amamentar relatada pelas mães e no escore de dor. Conclusões: Apesar de ter sido observada dificuldade de sucção em lactentes com anquiloglossia grave, a qualidade da amamentação em geral, a dor materna e a autoeficácia relatada pelas mães não diferem quando comparadas com as de lactentes com anquiloglossia leve. Assim, a gravidade da anquiloglossia parece não afetar os indicadores de amamentação.

Influência da Anquiloglossia neonatal na amamentação exclusiva nos seis primeiros meses de vida: estudo de coorte / Influence of Neonatal Ankyloglossia on exclusive breastfeeding in the six first months of life: a cohort study

RESUMO Objetivo Analisar a influência da anquiloglossia na prevalência e no tempo de exclusividade do aleitamento materno de lactentes a termo até o sexto mês de vida. Métodos Estudo de coorte prospectivo, realizado com 225 díades mãe-bebê que foram acompanhadas nos seis primeiros meses de vida em centro especializado em amamentação em um hospital terciário. Lactentes a termo com anquiloglossia do tipo assintomática (sem necessidade de cirurgia) foram comparados com lactentes sem alteração em um acompanhamento mensal. O diagnóstico de anquiloglossia foi realizado através do Bristol Tongue Assessment Tool, sendo considerados com diagnóstico positivo aqueles com escore menores ou iguais a 5 considerando os aspectos funcionais e anatômicos. As análises estatísticas foram realizadas através de estatística descritiva, regressão logística (determinantes do desmame), risco relativo e curvas de sobrevivência (para analisar o tempo de aleitamento entre os grupos com e sem anquiloglossia). Resultados A anquiloglossia esteve associada com o desmame (considerado ainda que parcial) antes do sexto mês de vida. Após análise ajustada, foi detectado maior risco de desmame nos lactentes com a alteração presente, com risco presente a partir do segundo mês de vida. Na análise de sobrevida, o tempo de aleitamento nos lactentes com anquiloglossia foi menor quando comparadas às crianças sem alteração. Conclusão Em comparação com lactentes com freio lingual normal, os bebês com anquiloglossia apresentaram tempo menor de aleitamento exclusivo, porém bem acima da média observada na população geral. O risco de desmame para este grupo também foi maior.

ABSTRACT Purpose To analyze the influence of ankyloglossia on the prevalence and duration of exclusive breastfeeding of full-term infants up to the sixth month of life. Methods Prospective cohort study, carried out with 225 mother-infant dyads who were followed up in the first six months of life in a center specialized in breastfeeding in a tertiary hospital. Full-term infants with asymptomatic ankyloglossia (no need for surgery) were compared with infants without change at monthly follow-up. Ankyloglossia was diagnosed using the Bristol Tongue Assessment Tool, with a positive diagnosis being considered for those with a score less than or equal to 5 considering functional and anatomical aspects. Statistical analyzes were performed using descriptive statistics, logistic regression (weaning determinants), relative risk, and survival curves (to analyze breastfeeding duration between groups with and without ankyloglossia). Results Ankyloglossia was associated with weaning (considered even partial) before the sixth month of life. After adjusted analysis, a higher risk of weaning was detected in infants with this alteration, with a risk present from the second month of life. In the survival analysis, the duration of breastfeeding in infants with ankyloglossia was shorter when compared to children without alterations. Conclusion Compared to infants with normal lingual frenulum, babies with ankyloglossia had shorter exclusive breastfeeding time, but well above the average observed in the general population. The risk of weaning for this group was also higher.

Self-perceived need for dental treatment and related factors. A cross-sectional population-based study.

This study compared adolescents' self-perceived need for orthodontic treatment with the normative need for such treatment and investigated associations between socioeconomic and demographic variables and self-perceptions of dental malocclusion. This cross-sectional study involved 1015 schoolchildren aged 12-15 years in São Luís, Maranhão, Brazil. The following data were collected using a questionnaire and an orthodontic examination card: demographic and identifying data, socioeconomic data, educational levels of family, household income, economic classification criteria, and self-reported skin color behavioral data, and oral health data. Normative occlusal condition was examined using the Angle classification and Dental Aesthetic Index (DAI). Data were analyzed using the chi-squared test (to analyze differences in the frequency distribuition of qualitative variables) and Poisson regression (to stimate associations between the perceived need of orthodontic treatment and study covariates), with a 5% significance level. Schoolchildren's self-perceived need for orthodontic treatment was associated with sex (p = 0.022) and the normative need for treatment (p = 0.004). Among socioeconomic, demographic, and oral health variables, only sex [prevalence ratio (PR) = 1.15; 95% confidence interval (95%CI) = 1.04-1.28; p = 0.009] and the normative need for orthodontic treatment (PR = 1.19; 95%CI = 1.08-1.32; p < 0.001) were associated with the perception of malocclusion, with female adolescents reporting a greater need for orthodontic treatment. Female adolescents seems to be more sensitive to oral health problems. The results suggest that the DAI score might reflect a self-perceived need for orthodontic treatment and the Angle classification might overestimate the orthodontic treatment need.

Impact of Malocclusion on the Quality of Life of Brazilian Adolescents: A Population-Based Study.

The objective of this study was to evaluate the impact of malocclusion on the quality of life (QOL) of adolescents in Brazil. We carried out a cross-sectional study in a sample population of 1015 schoolchildren aged 12 to 15 years from São Luís, Maranhão, Brazil. The explanatory variable was malocclusion, evaluated on the basis of the normative need or the adolescent's self-perceived need for dental treatment. Normative need for dental treatment was determined by professional diagnosis, made on the basis of Angle's classification, the Dental Aesthetic Index, and other morphological deviations (e.g., posterior crossbite, posterior open bite, and deep overbite). We analyzed the impact of malocclusion on the QOL using the Portuguese version of the Oral Health Impact Profile-14. Associations were estimated by using the prevalence ratio (PR) in Poisson regression analysis, with hierarchized modeling. An alpha of 5% was adopted as the criterion for statistical significance. The QOL of adolescents was impacted by malocclusion, classified by a normative need for treatment according to the Dental Aesthetic Index (PR = 1.27; 95% confidence interval [CI] = 1.03-1.56) or by the self-perceived need for treatment (PR = 2.54; 95% CI = 1.81-3.56). Certain sociodemographic variables, including the head of the family (PR = 1.52; 95% CI = 1.02-2.23), greater educational level of the head of the family (PR = 0.32; 95% CI = 0.17-0.61), and female sex (PR = 1.40; 95% CI = 1.05-1.89), had negative associations with QOL. We conclude that malocclusion has a negative impact on the QOL of adolescents, associated with socioeconomic conditions and the cosmetic effects of malocclusion.

Alterations of oral functions and dental malocclusions in adolescents: a cross-sectional population-based study / Alterações das funções orais e má oclusão em adolescentes: um estudo transversal de base populacional

Abstract This article aims to assess whether alterations of oral functions (AOF) are associated with malocclusion (MO)'s type and severity. Cross-sectional study of a representative sample of 332 adolescents aged 12 years in São Luís-MA, Northeastern Brazil. MO criteria included Angle's classification, Dental Aesthetic Index, and other morphological problems. The AOF were evaluated by breathing, phonation, chewing, and swallowing. Odds ratios (OR) and 95% confidence intervals (95%CI) were calculated using logistic and multinomial regression analyses (α=5%). Mouth breathing was associated with defined (OR=3.84; 95%CI=1.45-10.12), disabling (OR=4.34; 95%CI=1.99-9.49), and class III (OR=4.15; 95%CI=1.19-14.54) MO. Phonation problems were associated with defined (OR=2.01; 95%CI=1.02-4.39), disabling (OR=3.04; 95%CI=1.55-5.96), and Class II (OR=2.02; 95%CI=1.28-3.18) MO. Chewing disorders were associated with posterior crossbite (PCB) (OR=2.32; 95%CI=1.12-4.82). Swallowing disorders were associated with Class III MO (OR=5.66; 95%CI=1.35-23.71), PCB (OR=6.13; 95%CI=2.76-13.62), and posterior open bite (OR=4.53; 95%CI=1.72-8.92). Breathing and phonation alterations are associated with MO in anterior arch segments, while chewing and swallowing disorders, in the posterior segments.

Resumo O objetivo deste artigo é avaliar se alterações das funções orais (AFO) estão associadas ao tipo e gravidade da maloclusão (MO). Estudo transversal com amostra representativa de 332 adolescentes de 12 anos em São Luís-MA, Nordeste do Brasil. Critérios de MO incluíram Classificação de Angle, Índice de Estética Dental e outros problemas morfológicos. As AFO foram avaliadas por respiração, fonação, mastigação e deglutição. Odds ratios (OR) e intervalos de confiança de 95% (IC95%) foram calculados em análises de regressão logística e multinomial (α=5%). Respiração oral foi associada com MO definida (OR=3,84; IC95%=1,45-10,12), incapacitante (OR=4,34; IC95%=1,99-9,49) e classe III (OR=4,15; IC95%=1,19-14,54). Problemas de fonação foram associados às MO definidas (OR=2,01; IC95%=1,02-4,39), incapacitantes (OR=3,04; IC95%=1,55-5,96) e Classe II (OR=2,02; IC95%=1,28-3,18). Alterações na mastigação foram associadas à mordida cruzada posterior (MCP) (OR=2,32; IC95%=1,12-4,82). Deglutição atípica foi associada à MO Classe III (OR=5,66; IC95%=1,35-23,71), MCP (OR=6,13; IC95%=2,76-13,62) e mordida aberta posterior (OR=4,53; IC95%=1,72-8,92). Alterações de respiração e fonação estão associadas às MO nos segmentos anteriores do arco, enquanto as de mastigação e deglutição, nos segmentos posteriores.

Microscopic evaluation of induced tooth movement after subluxation trauma: an experimental study in rats.

OBJECTIVE: The objective of this study was to assess the histological alterations that occurred in the periodontal area of rat molars submitted to induced tooth movement (ITM) right after an intentional trauma (subluxation). METHODS: Forty adult male Wistar rats (Rattus norvegicus albinus) were selected. The animals were divided into eight groups (n=5), according to the combination of variables: Group 1--control (neither trauma nor ITM); Group 2--ITM; Groups 3, 4, 5 and 6--dentoalveolar trauma groups corresponding, respectively, to 1, 3, 8 and 10 days after trauma; Groups 7 and 8 - the animals' molars were subjected to a 900 cN impact and, one and three days after the trauma event, tooth movement was induced. The rats' maxillary first molars were mesially moved during seven days with a closed coil (50 cN). After the experimental period of each group, the animals were sacrificed by anesthetic overdose and the right maxillas were removed and processed for histological analysis under light microscopy. RESULTS: In the animals of group 3, 4, 5 and 6, the histological alterations were not very significant. Consequently, the effect of induced tooth movement right after a subluxation event (groups 7 and 8) was very similar to those described for Group 2. CONCLUSIONS: There was no difference in the quality of periodontal repair when ITM was applied to teeth that had suffered a subluxation trauma.

Self-perceived need for dental treatment and related factors. A cross-sectional population-based study

Abstract This study compared adolescents' self-perceived need for orthodontic treatment with the normative need for such treatment and investigated associations between socioeconomic and demographic variables and self-perceptions of dental malocclusion. This cross-sectional study involved 1015 schoolchildren aged 12-15 years in São Luís, Maranhão, Brazil. The following data were collected using a questionnaire and an orthodontic examination card: demographic and identifying data, socioeconomic data, educational levels of family, household income, economic classification criteria, and self-reported skin color behavioral data, and oral health data. Normative occlusal condition was examined using the Angle classification and Dental Aesthetic Index (DAI). Data were analyzed using the chi-squared test (to analyze differences in the frequency distribuition of qualitative variables) and Poisson regression (to stimate associations between the perceived need of orthodontic treatment and study covariates), with a 5% significance level. Schoolchildren's self-perceived need for orthodontic treatment was associated with sex (p = 0.022) and the normative need for treatment (p = 0.004). Among socioeconomic, demographic, and oral health variables, only sex [prevalence ratio (PR) = 1.15; 95% confidence interval (95%CI) = 1.04-1.28; p = 0.009] and the normative need for orthodontic treatment (PR = 1.19; 95%CI = 1.08-1.32; p < 0.001) were associated with the perception of malocclusion, with female adolescents reporting a greater need for orthodontic treatment. Female adolescents seems to be more sensitive to oral health problems. The results suggest that the DAI score might reflect a self-perceived need for orthodontic treatment and the Angle classification might overestimate the orthodontic treatment need.

Knowledge on dental trauma and orthodontic tooth movement held by a group of orthodontists.

The objective of this work was to assess the knowledge about orthodontic tooth movement and dental trauma held by a group of orthodontists in specific areas of Brazil. For this purpose, 166 questionnaires with 15 objective questions about this subject were distributed. One hundred and five questionnaires were properly filled and collected after 30 days. It was concluded that, except for avulsion, the knowledge on dental injuries held by the professionals interviewed was considered unsatisfactory, and about 40% of them were not acquainted with the recommendations for the orthodontic movement of traumatized teeth.

Compensatory canine angulation in angle Class II and III patients.

The aim of this study was to evaluate the occurence of compensation in mesiodistal axial inclinations of canines in skeletal malocclusions patients. The sample consisted of 25 Angle Class II, division 1 malocclusion (group 1) and 19 Angle Class III malocclusion patients (group 2). After measurement of dental angulations through a method that associates plaster model photography and AutoCad software, comparisons between the groups were performed by T-test for independent samples. Results showed that there was no statistically significant difference (p < 0.05) between groups, when maxillary canine angulations were compared. Regarding the mandibular canines, there was a statistically significant difference in dental angulation, expressed by 3.2 degrees for group 1 and 0.15 degrees for group 2. An upright position tendency for mandibular canines was observed in the Angle Class III sample. This configures a pattern of compensatory coronary positioning, since the angulation of these teeth makes them occupy less space in the dental arch and consequently mandibular incisors can be in a more retracted position in the sagittal plane.