Relationship between aesthetic concern and self-esteem in adolescents with severe malocclusion.

OBJECTIVE: This study aimed to evaluate the relationship between aesthetic concern and self-esteem in adolescents with severe malocclusion. METHODS: A cross-sectional study developed with 543 adolescents from 11 to 13 years of age and severe malocclusion was selected. Dental aesthetic index (DAI) diagnosed the malocclusion and selected the groups with greater severity (DAI 3 and 4). Aesthetic concern was assessed using the oral aesthetic subjective impact scale (OASIS) and considered an outcome variable. The global negative self-evaluation (GSE) evaluated self-esteem. The variables were analysed using Poisson multiple regression and the model adjustment determined by the Akaike information criterion (AICC). The effect of each variable on OASIS was expressed as a prevalence ratio (PR) with 95% confidence intervals. The analyses were performed using the R program with a significance level of 5%. RESULTS: A significant association was observed between aesthetic concern scores and self-esteem (p<.05). Individuals with low self-esteem had OASIS scores 14% higher (PR: 1.14; 95% CI: 1.08-1.21). There was no significant association between OASIS and gender and age (p>.05). CONCLUSIONS: Self-esteem modulates how the individual perceives malocclusion. Adolescents with severe and very malocclusion and low self-esteem have greater aesthetic concerns.

Impact of Dental Aesthetic Index characteristics on the severity levels of malocclusion in a non-White population.

INTRODUCTION: This study evaluated the impact of the esthetic and occlusal characteristics of the Dental Aesthetic Index (DAI) on the need for orthodontic treatment in a non-White population. METHODS: A cross-sectional study was conducted with 1296 non-White adolescents aged 12 years. DAI was the outcome variable (DAI 1 and 2 and DAI 3 and 4). The independent variables were categorized on the basis of the occlusal esthetic characteristics evaluated by DAI (tooth absence, crowding, spacing, midline diastema, maxillary misalignment, mandibular misalignment, maxillary anterior overjet, mandibular overjet, anterior open bite, and anteroposterior molar relationship). Simple logistic regression models were adjusted for the outcome, and the raw odds ratios were estimated. Variables with a P value of <0.20 for individual analyses were tested in a multiple logistic regression model, with P ≤0.05 remaining. RESULTS: A total of 1296 adolescents (764 girls and 532 boys) were evaluated; 1067 (82.3%) had DAI 1 or 2 (minor to a moderate need for orthodontic treatment), and 229 (17.7%) had DAI 3 or 4 (defined need for orthodontic treatment). The results showed that adolescents with diastema, maxillary irregularity, mandibular irregularity, mandibular overjet, anterior open bite, and the altered molar relationship had 5.34, 2.36, 2.63, 3.56, 8.73, and 5.16 times more likelihood to have DAI 3 or 4 (P ≤0.05), respectively. CONCLUSIONS: Diastema, maxillary and mandibular misalignment, mandibular overjet, anterior open bite, and anteroposterior molar relationship were the characteristics that influenced the determination of the need for orthodontic treatment in a non-White population using the DAI index.

The impact of erosive tooth wear related to masticatory quality in an indigenous Brazilian population: A cross-sectional study.

OBJECTIVE: The study aimed to associate the impact of tooth wear with the perception of masticatory quality and eating habits in a Brazilian indigenous population. METHODS: A cross-sectional observational study was carried out with 197 indigenous from the Macuxi tribe (Roraima, Brazil) divided into age groups (adolescents and adults). Tooth wear was determined by the Basic Erosive Wear Examination (BEWE). The masticatory quality was evaluated using the Quality of Masticatory Function Questionnaire (QMFQ). Study participants also answered questions regarding eating habits and frequency of food consumption. Logistic regression models and crude Odds Ratios were estimated with 95% confidence intervals. Variables with P<0.20 in simple analyses were tested in a multiple logistic regression model; those with P ≤ 0.05 remained in the model. RESULTS: Tooth wear was observed in 38.1% of the indigenous, and 48.2% of them reported having their masticatory function affected; banana was the most frequently consumed item (54.3%); there was a significant association between adulthood and the presence of tooth wear (P<0.0001). CONCLUSIONS: Tooth wear related to eating habits and poor masticatory quality did not impact the oral health condition of the studied indigenous population. However, adulthood was associated with tooth wear in this sample.

Correlation between malocclusion and history of bullying in vulnerable adolescents.

OBJECTIVES: To assess the correlation between malocclusion and a history of bullying. MATERIALS AND METHODS: A cross-sectional study of 494 adolescents aged 12 to 15 years was conducted. The National School Health Survey questionnaire (PeNSE 1 and 2) was used to determine history of bullying by identifying the victim and the abuser. Variables were evaluated based on the individual (age), environment (income, father's and mother's education, housing, government assistance, and parents' occupation), social and emotional well-being (CPQ11-14 domains), self-perceived need for orthodontic treatment, and clinical conditions (crowding, diastema, maxillary and mandibular overjet, and anterior open bite). Data were analyzed by Spearman correlation and by multivariate analysis, which allowed graphical representation of the eight variables studied in only two dimensions. RESULTS: There was no correlation between bullying and variables related to the individual and the environment. Maxillary overjet and self-perception related to the need for orthodontic treatment were important to explain the data variability. CONCLUSIONS: Malocclusion did not correlate with bullying history. However, increased maxillary overjet influences adolescent self-perception, suggesting a potential condition for bullying events.

Parental perception of malocclusion, its severity and aesthetic concerns in children with mixed dentition: A cross-sectional study.

OBJECTIVE: This study aimed to associate the parents' perception of the need for treatment and the children's aesthetic concern, considering the influence of malocclusion severity levels. METHODS: A population-based cross-sectional study was conducted with 770 children aged 8 to 10 years in the mixed dentition stage. A closed question sent to parents assessed the subjective orthodontic treatment need (outcome). Orthodontic Aesthetic Subjective Impact Score (OASIS) evaluated children's aesthetic concerns, and the Dental Aesthetic Index (DAI) diagnosed the anterior characteristics and malocclusion severity levels. Individual analyses were performed relating the outcome as independent variables. The variables with P<0.20 in the individual analyses were tested in multiple logistic regression models, and those with P<0.10 remained in the model. The adjusted odds ratio was estimated with a 95% confidence interval. RESULTS: Parents of children with higher aesthetic concerns are 1.82 times more likely to believe that their child needs orthodontic treatment (P<0.05). Parents of children with very severe malocclusion are 1.91 times more likely to perceive their child's need for orthodontic treatment (P<0.05). CONCLUSION: Parents of children with greater aesthetic concerns are more likely to perceive the need for orthodontic treatment, and very severe malocclusion also influences parents' perception of the need for orthodontic treatment.

Esthetic impact of maxillary midline diastema and mandibular crowding in children in the mixed dentition.

INTRODUCTION: This study aimed to investigate the esthetic impact of mandibular crowding and maxillary midline diastema in children in the mixed dentition. METHODS: The sample for this cross-sectional study comprised 785 children, aged 8-10 years, in the late mixed dentition. Mandibular crowding and maxillary midline diastema were evaluated clinically with the Dental Aesthetic Index. Mandibular crowding and maxillary midline diastema were evaluated to determine tooth size-arch length discrepancies. The sample was stratified as group 1, children without maxillary midline diastema or mandibular crowding (n = 177); group 2, children with maxillary midline diastema (n = 256); group 3, children with mandibular crowding (n = 208); and group 4, children with maxillary midline diastema and mandibular crowding (n = 144). The subjective esthetic impact was evaluated using the Orthodontic Aesthetic Subjective Impact Score. Descriptive and exploratory analyses of the data were performed. A generalized linear model was applied, adjusted for the possible confounding variables (age, gender, and race) with a significance level of 5% because the Orthodontic Aesthetic Subjective Impact Score did not meet the assumptions of analysis of variance. RESULTS: Children in groups 2 and 3 showed greater esthetic concern than group 1 (P <0.05). Children in groups 2 and 3 did not show a significant difference with children in group 4 (P >0.05). CONCLUSIONS: Children with mixed dentition with mandibular crowding or maxillary median diastema reported significantly more esthetic concern than children without these conditions.

Upper airways after mandibular advancement orthognathic surgery: A 4-year follow-up.

INTRODUCTION: The purpose of this study was to assess the stability of changes in the upper airways 4 years after orthognathic surgery in patients with skeletal Class II malocclusion. METHODS: A retrospective clinical study was conducted including 33 cone-beam computed tomography images from 11 patients (average age of 35.91 years) followed up longitudinally for 4 years. The airways were measured with the help of the Dolphin Imaging software (Dolphin Imaging and Management Systems, Chatsworth, Calif) at 3 points: T1 (preoperative), T2 (6 months after surgery), and T3 (4 years after surgery). The parameters assessed were surface area (SA), minimum axial area, and volume (VOL) of the pharyngeal airway space. The times were compared using analysis of variance and Tukey's test. Pearson's analysis was performed to assess the correlation with surgical changes and age (P <0.05). RESULTS: Four years after operating on the airway spaces, the means of SA and VOL were significantly higher than those observed before the surgery (P <0.05). The means at 6 months were intermediate, with no significant difference before the surgery and 4 years after it (P >0.05). There was no significant correlation of the changes in SA, VOL, and minimum axial area with the amount of mandibular advancement, counterclockwise rotation of the occlusal plane, and age of the patient (P >0.05). CONCLUSIONS: Four years after mandibular advancement surgery in patients with skeletal Class II malocclusion, the increases in the airways remained stable.

Is the adolescent's esthetic concern associated with anterior occlusal conditions or the malocclusion severity level?

OBJECTIVES: To assess the esthetic impact of anterior occlusal conditions and malocclusion severity levels. MATERIALS AND METHODS: A population-based cross-sectional study of 700 adolescents aged 15 to 19 years was conducted. The Oral Aesthetic Subjective Impact Scale (OASIS) was used to evaluate the subjective esthetic impact of malocclusion. The Dental Aesthetic Index (DAI) criteria were used to diagnose the anterior occlusal characteristics in isolation and the severity levels of malocclusion. The variables with P < .20 in the individual analyses were tested in multiple logistic regression models, and those with P < .10 remained in the model. The adjusted odds ratio (OR) was estimated with a 95% confidence interval (CI). RESULTS: Of the adolescents, 42% showed negative self-perception of malocclusion. In addition, 15.4% of adolescents had severe malocclusion (DAI 3) and 18.9% very severe malocclusion (DAI 4). Crowding and spacing were shown to be 2.90 (CI: 2.06-4.09) and 2.53 (CI: 1.65-3.86) times, respectively, more likely to cause a negative esthetic impact in adolescents (P < .05). In addition, adolescents with orthodontic treatment need (DAI 2, 3, and 4) were more likely to report a negative esthetic impact (P < .05). CONCLUSIONS: Anterior crowding and spacing are the conditions that most influence the esthetic concern of adolescents. Adolescents with very severe malocclusion and higher orthodontic treatment need are more likely to report a negative esthetic impact.

Oral and maxillofacial outcomes in children with microcephaly associated with the congenital Zika syndrome.

INTRODUCTION: The objective of this study is to assess the oral and maxillofacial characteristics of microcephalic children associated with congenital Zika syndrome (CZS). METHODS: A cross-sectional, observational study was carried out with 61 patients with microcephaly/CZS born between June 2015 and September 2017 (29 boys and 32 girls, average age of 22.8 months) and a control group with 58 non-CZS children born in the same period (25 boys and 33 girls, average age of 23.8 months). The functional clinical analysis considered the labial and lingual frena, tongue anterior projection, oral escape, palate form, and first tooth eruption. For the craniofacial analysis, facial anthropometric points and the cephalic perimeter at the time were measured. Demographic data were collected from medical records, and a clinical exam was performed in order to register the intrabuccal characteristics and craniofacial measures. The chi-square test and Student's t-test were used with a significance level of 0.05. RESULTS: The narrow palate form, tongue anterior projection, oral escape, and late first tooth eruption were significantly more present in the group with microcephaly/CZS. As for the craniofacial analysis, face width (Bi-Zi), mandible width (Go-Go), height of face upper third (Tr-G), and monthly growth of cephalic perimeter were significantly smaller, whereas height of face lower third (Sn-Gn) was significantly bigger in the group with microcephaly/CZS (P < 0.05). CONCLUSION: Children with microcephaly resulting from a congenital Zika infection showed functional, oral, and maxillofacial changes and smaller facial development in comparison with non-CZS children in the same age group.

Association between 2 indexes for evaluating malocclusion in the mixed dentition.

INTRODUCTION: This study aimed to associate 2 indexes for evaluating malocclusion in the mixed dentition. METHODS: A population-based cross-sectional study was conducted involving 743 children aged 8-10 years, divided into early and late mixed dentition. The Dental Aesthetic Index (DAI) and criteria proposed by Grabowski were used to evaluate malocclusion. Associations between the DAI (outcome variable) and the other independent variables (gender, race, and mixed dentition stage) were analyzed using logistic regression models. Simple logistic regression models were constructed, estimating the crude odds ratios with the respective 95% confidence intervals (CIs). The variables with P < 0.20 in the simple analyses were tested in multiple logistic regression models, estimating adjusted odds ratios with the respective 95% CIs. RESULTS: We found that 84.01% (185/220) of the diagnoses were coincidental between the Grabowski Index and DAI in patients without malocclusion. In contrast, 59.80% (439/734) of the patients were diagnosed by both indexes (Grabowski and DAI) with malocclusion. Children with malocclusion, diagnosed by the Grabowski Index, were 5.85 (P = 0.0001 and 95% CI: 4.08-8.39) times more likely to show malocclusions when diagnosed by the DAI. CONCLUSIONS: DAI and the criteria proposed by Grabowski were expressed differently in relation to malocclusion in the mixed dentition. This study suggests the importance of specific criteria for the evaluation of malocclusion at this stage of development.

Esthetic impact of malocclusions in the anterior segment on children in the mixed dentition.

INTRODUCTION: To assess the esthetic subjective effect of malocclusions in the anterior segment on children in the mixed dentition. METHODS: A cross-sectional study was carried out with a population-based sample of 787 children aged 8-10 years in the late mixed dentition (n = 787). Orthodontic Aesthetic Subjective Impact Score determined the esthetic subjective effect. For assessing the malocclusions in the anterior segment (anterior crowding, anterior spacing, diastema, anterior open bite, and anterior maxillary overjet), the following Dental Aesthetic Index criteria were used. Sex, family income, and education level were used as control variables. The variables were analyzed using a simple logistic regression model, estimating crude odds ratios. The variables with P <0.20 in the simple analyses were tested in multiple regression models, estimating adjusted odds ratios with the respective 95% confidence intervals. RESULTS: Increased overjet was 1.54 (95% CI: 1.08-2.17) times more likely to cause greater esthetic concern (P <0.05), especially in girls (P <0.05). CONCLUSIONS: Increased overjet negatively affected children's esthetic self-perception in the mixed dentition.

Can orthodontic need cause bullying? / A necessidade de ortodontia pode causar bullying?

ABSTRACT Objective: To determine the association between orthodontic treatment need and the self-reported bullying, and its impact on adolescents' self-esteem. Methods: The sample consisted of 160 schoolchildren from 11 to 14 years of age, enrolled in public schools. The history of bullying was evaluated by means of the Crozier; Dimmock adapted Questionnaire (1999). Self-esteem was determined by means of the Global Negative Self-Evaluation Scale (GSE). The normative orthodontic treatment need was determined by the Dental Health Component (DHC) and perceived need, by Aesthetic Component (AC) of the Index of Orthodontic Treatment Need (IOTN). Individual analyses were made of the associations with the history of bullying (outcome). Results: The variables that presented P ? 0.20 in the individual analyses were tested in a multiple logistic regression model, and variables with P ? 0.05 remained in the model. The odds ratios with the intervals of confidence were estimated. According to the results 72.5% of the schoolchildren reported a history of bullying. The schoolchildren who presented negative impact on the quality of life related to oral symptoms and negative self-esteem were observed to have 4.59 and 5.44 times more chance, respectively to report a history of bullying (P < 0.05), which did not suffer the influence of normative and perceived orthodontic treatment need. Conclusion: The history of bullying was not influenced by orthodontic treatment need, but by the low self-esteem of adolescents.

RESUMO Objetivos: Determinar a associação entre a necessidade de tratamento ortodôntico e o bullying autorrelatado e seu impacto na autoestima dos adolescentes. Métodos: A amostra foi composta por 160 escolares de 11 a 14 anos, matriculados em escolas públicas. A história de bullying foi avaliada por meio do Questionário Crozier; adaptado por Dimmock (1999). A autoestima foi determinada por meio do Global Negative Self-Evaluation Scale (GSE). A necessidade normativa de tratamento ortodôntico foi determinada pelo Componente de Saúde Bucal (DHC) e a necessidade percebida, pelo Componente Estético (AC) do Índice de Necessidade de Tratamento Ortodôntico (IOTN). Foram realizadas análises individuais das associações com a história de bullying (desfecho). Resultados: As variáveis que apresentaram P ? 0.20 nas análises individuais foram testadas em modelo de regressão logística múltipla, permanecendo no modelo as variáveis com P ? 0.05. Foram estimados os odds ratios com os intervalos de confiança. De acordo com os resultados, 72.5% dos escolares relataram história de bullying. Os escolares que apresentaram impacto negativo na qualidade de vida relacionado aos sintomas bucais e autoestima negativa tiveram 4.59 e 5.44 vezes mais chance, respectivamente, de relatarem história de bullying (P < 0.05), e não sofreram influência da necessidade de tratamento ortodôntico normativa e percebida. Conclusão: A história de bullying não foi influenciada pela necessidade de tratamento ortodôntico, mas pela baixa autoestima dos adolescentes.

Impact of anterior occlusal conditions in the mixed dentition on oral health-related quality-of-life item levels.

OBJECTIVES: To evaluate the impact of anterior occlusal conditions in the mixed dentition on item-level analysis of oral health-related quality of life (OHRQoL). MATERIALS AND METHODS: A population-based cross-sectional study of 787 children aged 8 to 10 years was conducted. The Child Perceptions Questionnaire (CPQ8-10) was used to evaluate OHRQoL, and the analysis of item levels was performed on CPQ8-10 domains. Anterior occlusal characteristics were diagnosed according to the Dental Aesthetic Index criteria. Individual analyses were performed relating the outcome as independent variables. The variables with P < .20 in the individual analyses were tested in multiple logistic regression models, and those with P < .10 remained in the model. The adjusted odds ratio (OR) was estimated with a 95% confidence interval (CI). RESULTS: No associations were found with regard to anterior occlusal characteristics (P < .001) after the variables of the previous determinants were adjusted for multivariate analysis. However, the following variables were significantly associated with negative impact on OHRQoL item levels: sex, in oral symptoms (OR = 1.42; CI, 1.07-1.89) and emotional well-being (OR = 1.34; CI, 1.00-1.79); race, in oral symptoms (OR = 1.48; CI, 1.10-1.98), emotional well-being (OR = 1.54; CI, 1.14-2.06), and social well-being (OR = 1.34; CI, 1.00-1.80); and family income in functional limitation (OR = 1.46; CI, 1.06-2.02), emotional well-being (OR = 1.71; CI, 1.21-2.42), and social well-being (OR = 1.59; CI, 1.14-2.21). CONCLUSIONS: Anterior occlusal conditions did not affect the levels of OHRQoL items.

How is orthodontic treatment need associated with perceived esthetic impact of malocclusion in adolescents?

INTRODUCTION: The purpose of this research was to evaluate the esthetic impact of orthodontic treatment need in adolescents. METHODS: This cross-sectional study was performed with 1172 adolescents aged 12 (n = 638) years and 15 (n = 534) years from Salvador, Bahia, Brazil. The esthetic impact was the following outcome variables: Aesthetic Component of the Index of Orthodontic Treatment Need and the Oral Aesthetic Subjective Impact Scale. The normative orthodontic treatment need was assessed by the Dental Health Component of the Index of Orthodontic Treatment Need (IOTN-DHC) and by the Dental Aesthetic Index (DAI). Logistic regression models were adjusted, estimating crude odds ratio with the respective 95% confidence intervals. The variables with P ≤0.20 in the individual analyses were tested in multiple logistic regression models, remaining the variables with P ≤0.05. RESULTS: The results showed a statistically significant association for the esthetic impact (Aesthetic Component of the Index of Orthodontic Treatment Need and the Oral Aesthetic Subjective Impact Scale) when assessing the normative orthodontic treatment need by the DAI (P <0.05). However, there was no significant association between subjective esthetic impact and normative needs when using the IOTN-DHC (P >0.05). CONCLUSIONS: DAI was more associated with the adolescents' esthetic concern than IOTN-DHC and should be the Index of Orthodontic Treatment Need to be selected to complement the patient's self-perception.

Exploring the perception of orthodontic treatment need using the Dental Aesthetic Index and Index of Orthodontic Treatment Need.

INTRODUCTION: This study aimed to explore the perception of orthodontic treatment need by using the Dental Aesthetic Index (DAI) and the Index of Orthodontic Treatment Need (IOTN). METHODS: A cross-sectional study was conducted on a representative random sample (N = 248) of adolescents aged 12 years. The DAI and both components of IOTN were used to evaluate malocclusion. The association between the Dental Health Component of the IOTN with gender and ethnic group were analyzed by chi-square test. The concordances between the indexes were analyzed by the kappa statistic, with 95% confidence intervals (CIs). RESULTS: The prevalence of adolescents with high severity and orthodontic treatment need was 10.5% (95% CI, 6.7-14.3), 36.5% (95% CI, 32.3-44.3), and 73.4% (95% CI, 67.9-78.9) for the Aesthetic Component of the IOTN, Dental Health Component of the IOTN, and DAI, respectively. The indexes showed high agreement for the cases with low treatment need, whereas low concordance was observed for the cases with high treatment need. CONCLUSIONS: The perception of orthodontic treatment need was assessed differently using DAI and IOTN.

Evaluation of miniscrew angulation in the posterior maxilla using cone-beam computed tomographic image.

OBJECTIVE: This study aimed at evaluating whether changes in the insertion angle is a determining factor in the positioning of the miniscrews body in a region with larger interradicular space in the posterior maxilla. METHODS: Analysis of 60 posterior maxillary quadrants were made using images obtained by means of cone-beam computed tomographic image (CBCT), with 0.076-mm voxel, which presented a real miniscrew inserted in the mesial region of the maxillary first molars, serving as reference point for the placement of the virtual miniscrews. Measurements of the distances between roots were made in three points on the body of the virtual miniscrews (A, B and C), at four different angulations, 70o, 60o, 50o and 40o (T1 to T4), in relation to the long axis of the second premolar. This evaluation was made in four groups, selected in accordance with the disposition of the roots of the second premolars and first molars: Group 1 (all types of roots), Group 2 (convergent roots), Group 3 (divergent roots) and Group 4 (parallel roots). RESULTS: There were no statistically significant differences in the measurements of points A, B and C, at the different angles (70o, 60o, 50o and 40o) and in the different groups (p > 0.05). CONCLUSIONS: Changes in the insertion angle is not a determinant factor in the positioning of miniscrews body in regions with larger interradicular space in posterior maxilla.

Evaluation of miniscrew angulation in the posterior maxilla using cone-beam computed tomographic image

ABSTRACT Objective: This study aimed at evaluating whether changes in the insertion angle is a determining factor in the positioning of the miniscrews body in a region with larger interradicular space in the posterior maxilla. Methods: Analysis of 60 posterior maxillary quadrants were made using images obtained by means of cone-beam computed tomographic image (CBCT), with 0.076-mm voxel, which presented a real miniscrew inserted in the mesial region of the maxillary first molars, serving as reference point for the placement of the virtual miniscrews. Measurements of the distances between roots were made in three points on the body of the virtual miniscrews (A, B and C), at four different angulations, 70o, 60o, 50o and 40o (T1 to T4), in relation to the long axis of the second premolar. This evaluation was made in four groups, selected in accordance with the disposition of the roots of the second premolars and first molars: Group 1 (all types of roots), Group 2 (convergent roots), Group 3 (divergent roots) and Group 4 (parallel roots). Results: There were no statistically significant differences in the measurements of points A, B and C, at the different angles (70o, 60o, 50o and 40o) and in the different groups (p > 0.05). Conclusions: Changes in the insertion angle is not a determinant factor in the positioning of miniscrews body in regions with larger interradicular space in posterior maxilla.

RESUMO Objetivo: o presente estudo objetivou avaliar se alterações no ângulo de inserção do miniparafuso são um fator decisivo para a adaptação do corpo do parafuso em áreas com espaço inter-radicular aumentado, na região posterior da maxila. Métodos: foram realizadas análises em 60 quadrantes maxilares posteriores, a partir de imagens obtidas por tomografia computadorizada de feixe cônico (TCFC), com voxel de 0,076 mm, as quais apresentavam um miniparafuso real inserido na região mesial dos primeiros molares superiores, utilizado como ponto de referência para a inserção de miniparafusos virtuais. As distâncias inter-radiculares foram mensuradas utilizando-se três pontos marcados no corpo dos miniparafusos virtuais (A, B e C), inseridos com quatro angulações diferentes (70°, 60°, 50° e 40°) (T1 a T4) em relação ao longo eixo do segundo pré-molar. A avaliação foi realizada em quatro grupos, selecionados de acordo com a disposição das raízes dos segundos pré-molares e primeiros molares: Grupo 1 - contendo todos os tipos de raízes; Grupo 2 - raízes convergentes; Grupo 3 - raízes divergentes; e Grupo 4 - raízes paralelas. Resultados: não houve diferença estatisticamente significativa entre as medidas dos pontos A, B e C nas diferentes angulações (70°, 60°, 50° e 40°) ou entre os grupos (p > 0,05). Conclusões: alterações no ângulo de inserção dos miniparafusos não são um fator decisivo para a adaptação do corpo do parafuso, em áreas com espaço inter-radicular aumentado entre primeiro molar e segundo pré-molar superiores.

Debonding forces of different pads in a lingual bracket system.

OBJECTIVE:: To evaluate the shear bond strength of lingual orthodontic brackets with resin or metal pads, the location of bond failure and the adhesive remnant index (ARI). METHODS:: A total of 40 extracted upper premolars were randomly divided into two groups of 20 each: bonding with brackets having (1) pads with extended resin directly on the lingual surface of teeth, and (2) pads with metal custom base on the lingual surface of teeth. The debonding force was measured with an Instron universal testing machine. A Student's t-test was used to assess the difference between groups (α = 0.05). RESULTS:: The results showed a significant difference between the groups (p < 0.001). The shear bond strength of metal pads was significantly higher than resin pads. CONCLUSIONS:: Within the limitations of this in vitro study, it was concluded that the bond strength of lingual brackets with metal pads was higher than that of brackets with composite resin pads, due to the metal part being a single unit and welded. The failure location in the region between the bracket and the resin pad affected a higher percentage of the resin pads than the metal pads.

Debonding forces of different pads in a lingual bracket system

ABSTRACT Objective: To evaluate the shear bond strength of lingual orthodontic brackets with resin or metal pads, the location of bond failure and the adhesive remnant index (ARI). Methods: A total of 40 extracted upper premolars were randomly divided into two groups of 20 each: bonding with brackets having (1) pads with extended resin directly on the lingual surface of teeth, and (2) pads with metal custom base on the lingual surface of teeth. The debonding force was measured with an Instron universal testing machine. A Student's t-test was used to assess the difference between groups (α = 0.05). Results: The results showed a significant difference between the groups (p < 0.001). The shear bond strength of metal pads was significantly higher than resin pads. Conclusions: Within the limitations of this in vitro study, it was concluded that the bond strength of lingual brackets with metal pads was higher than that of brackets with composite resin pads, due to the metal part being a single unit and welded. The failure location in the region between the bracket and the resin pad affected a higher percentage of the resin pads than the metal pads.

RESUMO Objetivo: avaliar a resistência de união ao cisalhamento de braquetes ortodônticos linguais com pads em resina e metálicos, assim como os locais de ocorrência das falhas, além do Índice de Adesivo Remanescente (ARI). Métodos: 40 pré-molares superiores extraídos foram aleatoriamente divididos em dois grupos de 20 espécimes cada, para a colagem de braquetes com: 1) pads em resina, estendida diretamente na face lingual dos dentes; e 2) pads com base metálica customizada, na face lingual dos dentes. A força de descolagem dos braquetes foi mensurada por meio de uma máquina de ensaio universal (Instron). O teste t de Student foi utilizado para avaliar diferenças intergrupos (α = 0,05). Resultados: os resultados demonstram haver diferença significativa intergrupos (p < 0,001). A resistência de união ao cisalhamento dos pads metálicos foi significativamente maior em comparação aos pads em resina. Conclusões: dentro das limitações desse estudo in vitro, foi possível concluir que a resistência de união de braquetes linguais com pads metálicos foi superior à resistência de braquetes com pads em resina composta, uma vez que os pads metálicos customizados e os braquetes são fundidos, formando uma única unidade. A porcentagem de falhas de colagem na região entre o braquete e o pad foi maior para os pads em resina, em comparação aos pads metálicos.

Influence of quality of life, self-perception, and self-esteem on orthodontic treatment need.

INTRODUCTION: In this study, we aimed to assess the relationship between normative and perceived orthodontic treatment need associated with quality of life, self-esteem, and self-perception. METHODS: The sample included 248 schoolchildren aged 12 years. The normative aspect of orthodontic treatment was assessed by the Dental Health Component and the Aesthetic Component of the Index of Orthodontic Treatment Need. The subjects were further evaluated for their oral health-related quality of life, self-esteem, and self-perception of oral esthetics. The Aesthetic Component of the Index of Orthodontic Treatment Need was considered as the response variable, and generalized linear models estimated by the GENMOD procedure (release 9.3, 2010; SAS Institute, Cary, NC). Model 1 was estimated with only the intercept, providing the basis for evaluating the reduction in variance in the other models studied; then the variables were tested sequentially, considering P ≤0.05 as the criterion for remaining in the model. RESULTS: In the model, self-perception and self-esteem were statistically significant in relation to the perceived need for treatment. The normative need was significantly associated with the outcome variable and was not influenced by independent variables. CONCLUSIONS: The normative need for orthodontics treatment was not overestimated by the perceived need, and the perceived need was not influenced by sex and the impact on quality of life.