Prevalence and extent of Alveolar dehiscence and fenestration in Class I hyperdivergent subjects with different buccolingual inclinations of maxillary molar teeth: a CBCT study

Buccolingual position of teeth could affect the prevalence of alveolar bone defects. Presence of alveolar defects may have a deleterious effect on orthodontic treatment. The aim was to assess the prevalence and extent of dehiscence and fenestration in Class I hyperdivergent subjects and correlate it with buccolingual inclinations(BL) of maxillary first molar teeth. Methods: This retrospective study involved 80 CBCTs of class I hyperdivergent subjects divided into two groups - group A (n=33) buccolingual inclination >9º and group B (n=47) buccolingual inclination <9º. Prevalence and extent of alveolar bone dehiscence and fenestrations were measured in CBCTs using OSIRIX Lite software. Descriptive statistics, Mann Whitney U test and Spearman correlation were done for evaluating intergroup differences and correlation with Buccolingual inclination. Results: Overall prevalence of dehiscence and fenestration in maxillary first molars was 60.95% and 5% respectively. In the buccal alveolar bone, prevalence of dehiscence was highest in group A (84.6%) for 16 and in the lingual alveolar bone prevalence of dehiscence was highest in group B (71.4%) for 26 . On intergroup comparison, the extent of lingual alveolar bone dehiscence (26) in group B was significantly higher (p value <0.05) than in group A. No significant correlation between the extent of dehiscence and fenestration with buccolingual inclination of molar teeth was noted. Conclusion: Molar teeth with BL inclinations of more than 9º had higher prevalence of dehiscence on the buccal side and molar teeth with BL inclinations less than 9 degrees had more dehiscence on the lingual side. But no significant correlation of BL inclination with prevalence and extent of dehiscence and fenestration was noted

[Epidemiological survey of malocclusion in 8-9 year-old children in Qingdao Laoshan district].

PURPOSE: To investigate the prevalence of malocclusion and the correlation between caries and malocclusion in mixed dentition of primary students in Laoshan district of Qingdao city, to provide a scientific basis for early orthodontic treatment. METHODS: According to WHO's oral health survey (basic methods), a survey concerning oral health was performed in 1803 children aged 8-9 years old. SPSS 17.0 software package was used for statistical analysis . RESULTS: 1322 of 1803 pupils suffered from malocclusion, the prevalence of malocclusion in children surveyed was (73.32%). There were 519 cases(39.26%) of Class I malocclusion, 374 cases(28.29%) of Class II malocclusion, 357(27.00%) cases of Class III malocclusion, 72 cases (5.45%) with asymmetric malformation. As regard to clinical manifestations, deep overbite accounted for(37.67%) ,followed by deep overjet(29.19%), dental crowding (16.94%) and crossbite(16.03%). The prevalence of caries was 64.23%. Among them, there were 625 males (34.66%) and 532 females(29.51%). CONCLUSIONS: The prevalence rate of malocclusion in mixed dentition of primary students in Laoshan district of Qingdao district is not optimistic, the incidence of malocclusion is closely related to caries.

Occlusal traits, orthodontic treatment need and treatment complexity among untreated 17-21-year-olds in Estonia.

Objective: To analyze data on occlusal traits, orthodontic treatment need and treatment complexity in orthodontically untreated 17-21-year-old Estonians.Materials and methods: Clinical records and plaster casts of 390 untreated young adults (219 females and 171 males, mean age 18.5 years, range 17-21 years) were analyzed. Assessed occlusal traits included first molar and canine sagittal relationship, overjet, overbite, crowding, midline diastema, crossbite and scissor bite. The Index of Complexity, Outcome and Need (ICON) was used to assess orthodontic treatment need and complexity. Participants' opinions regarding their teeth were determined with a questionnaire.Results: The most prevalent occlusal traits were Class I sagittal relationship in canines (76%) and molars (70%), crowding (51%), overbite ≥3.5 mm (48%), the end-to-end sagittal relationship in canines (48%) and overjet ≥3.5 mm (47%). Antero-posterior asymmetry was common both in canines (39%) and molars (37%). According to ICON, 36% of participants had orthodontic treatment need.Conclusions: Desire for orthodontic treatment was associated with crowding and increased overjet, and with no gender difference, participants' main expectation of treatment was an improvement in dentofacial aesthetics. Treatment needs determined with ICON was moderate and in line with the participants' desire for orthodontic treatment.

Global distribution of malocclusion traits: A systematic review

Abstract Objective: Considering that the available studies on prevalence of malocclusions are local or national-based, this study aimed to pool data to determine the distribution of malocclusion traits worldwide in mixed and permanent dentitions. Methods: An electronic search was conducted using PubMed, Embase and Google Scholar search engines, to retrieve data on malocclusion prevalence for both mixed and permanent dentitions, up to December 2016. Results: Out of 2,977 retrieved studies, 53 were included. In permanent dentition, the global distributions of Class I, Class II, and Class III malocclusion were 74.7% [31 - 97%], 19.56% [2 - 63%] and 5.93% [1 - 20%], respectively. In mixed dentition, the distributions of these malocclusions were 73% [40 - 96%], 23% [2 - 58%] and 4% [0.7 - 13%]. Regarding vertical malocclusions, the observed deep overbite and open bite were 21.98% and 4.93%, respectively. Posterior crossbite affected 9.39% of the sample. Africans showed the highest prevalence of Class I and open bite in permanent dentition (89% and 8%, respectively), and in mixed dentition (93% and 10%, respectively), while Caucasians showed the highest prevalence of Class II in permanent dentition (23%) and mixed dentition (26%). Class III malocclusion in mixed dentition was highly prevalent among Mongoloids. Conclusion: Worldwide, in mixed and permanent dentitions, Angle Class I malocclusion is more prevalent than Class II, specifically among Africans; the least prevalent was Class III, although higher among Mongoloids in mixed dentition. In vertical dimension, open bite was highest among Mongoloids in mixed dentition. Posterior crossbite was more prevalent in permanent dentition in Europe.

Resumo Objetivo: considerando-se que os estudos disponíveis sobre a prevalência das más oclusões são de base local ou nacional, esse estudo teve como objetivo reunir dados para determinar a distribuição dos tipos de má oclusão em uma escala global, nas dentições permanente e mista. Métodos: foi realizada uma busca eletrônica através das ferramentas de pesquisa do PubMed, Embase e Google Acadêmico, para reunir estudos publicados até dezembro de 2016 sobre a prevalência das más oclusões, tanto na dentição permanente quanto na dentição mista. Resultados: dos 2.977 estudos encontrados, 53 foram analisados. Na dentição permanente, a distribuição mundial das más oclusões de Classe I, II e III foi, respectivamente, de 74,7% [31 - 97%], 19,56% [2 - 63%] e 5,93% [1 - 20%]. Na dentição mista, a distribuição dessas más oclusões foi de 73% [40 - 96%], 23% [2 - 58%] e 4% [0,7 - 13%]. Em relação às más oclusões verticais, observou-se prevalência de 21,98% de sobremordida profunda e 4,93% de mordida aberta. A mordida cruzada posterior afetou 9,39% da amostra. Os africanos mostraram a maior prevalência de Classe I e mordida aberta na dentição permanente (89% e 8%, respectivamente) e na dentição mista (93% e 10% respectivamente), enquanto os caucasianos apresentaram a maior prevalência de Classe II na dentição permanente (23%) e na dentição mista (26%). A má oclusão de Classe III na dentição mista foi mais prevalente entre xantodermas. Conclusão: mundialmente, nas dentições mista e permanente, as más oclusões de Classe I de Angle são mais prevalentes do que as de Classe II, especificamente entre os africanos; a menos prevalente foi a Classe III, ainda que mais prevalente entre os xantodermas na dentição mista. Na dimensão vertical, as mordidas abertas foram mais prevalentes entre xantodermas na dentição mista. A mordida cruzada posterior apresentou maior prevalência na dentição permanente na Europa.

Prevalence of malocclusion in children with obstructive sleep apnoea.

OBJECTIVES: To describe the prevalence of malocclusions in 2- to 10-year-old children suffering from obstructive sleep apnoea (OSA) and to evaluate the association between occlusal variables and OSA. SETTING AND SAMPLE POPULATION: A total of 2101 consecutive patients referred to an otorhinolaryngology unit were considered for the study. One hundred and fifty-six children (range 2-10 years) with suspected OSA were selected for a sleep study. The final sample consisted of 139 children suffering from OSA and a control group of 137 children. MATERIALS AND METHODS: All patients included in the study underwent a clinical orthodontic examination to record the following occlusal variables: primary canine relationship, presence of a posterior crossbite, overjet and overbite. Odds ratios and 95% confidence intervals, comparing the demographic characteristics and dental parameters in OSA vs non-OSA children, were computed. Multivariable logistic regression models were developed to compare independent variables associated with OSA to non-OSA children. RESULTS: The prevalence of malocclusions in children with OSA was 89.9% compared to 60.6% in the control group (P < 0.001). Factors independently associated with OSA compared to the control group were posterior crossbite (OR = 3.38; 95%CI:1.73-6.58), reduced overbite (OR = 2.43; 95%CI:1.15-5.15.), increased overbite (OR = 2.19; 95%CI:1.12-4.28) and increased overjet (OR = 4.25; 95%CI:1.90-9.48). CONCLUSIONS: This study showed a high prevalence of malocclusion in children with OSA compared to the control group. The posterior crossbite and deviations in overjet and overbite were significantly associated with OSA. The presence of these occlusal features shows the importance of an orthodontic evaluation in screening for paediatric OSA.

Relationship between foot posture and dental malocclusions in children aged 6 to 9 years: A cross-sectional study.

The aim of this study was to determine the association, if any, between foot posture and dental malocclusions in the anteroposterior plane, in children.The study population consisted of 189 children (95 boys and 94 girls) aged 6 to 9 years. In every case, previous informed consent was requested and obtained from the parent/guardian and the study was approved by the Ethics Committee of the University of Málaga (CEUMA 26/2015H).This observational, descriptive, cross-sectional analysis is based on a study population (STROBE). Qualified personnel conducted a podiatric and dental examination of each child, recording the Clarke angle and the foot posture index (FPI) as an outcomes measure in the feet, and also dental malocclusions, according to Angle classification.A significant correlation was observed for the FPI scores (for right foot) as well as the Clarke angle (for right foot), in relation to dental malocclusions as determined by Angle classification (P < .001). Of all the supinated feet analyzed, 38.46% were Class II according to Angle classification, and none were Class III. Of the pronated feet, 48.57% were Class III, 42.85% were Class I, and 8.57% were Class II.The Clarke angle decreases with the progression from Class I to III, whereas the FPI increases with that from Class I to III. These findings suggest there is a relation between the Clarke angle and FPI, on the one hand, and dental malocclusion on the other.

Occurrence of Malocclusion in Patients with Orofacial Pain and Temporomandibular Disorders.

AIM: This study aims to investigate the occurrence of malocclusion in patients with orofacial pain and temporomandibular disorders (TMDs). MATERIALS AND METHODS: A total of 437 standard orthodontic screening forms at a craniofacial pain TMD center were utilized to collect the data for this retrospective study. In addition to patient's demographics and Angle's molar classification, the following data were collected: Overjet (OJ), overbite (OB), mandibular range of motion, and whether or not there was a posterior crossbite or prior history of orthodontic therapy. Analysis of variance (ANOVA) and chi-square tests were then used to detect any statistical significant difference of the secondary variables' distribution among the three malocclusion groups. RESULTS: The majority of the studied population sample had a class I molar relationship (70.9%), followed by class II (21.1%) and class III molar relationship (8%). Overjet and OB were significantly increased for class II molar relationship group (p < 0.001), where no statistical differences could be identified for the mandibular range of motion between the groups. The prevalence of right and left posterior crossbite was about 12% for both, and most of the crossbites presented within class I molar group. CONCLUSION: Class I followed by class II molar relationships were found to be the most occurring relationship in the studied population. Posterior crossbite presented in 12% of cases and mostly affected subjects with class I molar relationship. CLINICAL SIGNIFICANCE: These findings would aid in recognizing the studied population's orthodontic presentation and support the assessment of their transverse interventional needs.

The prevalence of malocclusion and the need for orthodontic treatment among adolescents in the northern border region of Saudi Arabia: an epidemiological study.

BACKGROUND: To assess the prevalence of malocclusion and orthodontic treatment need among adolescents using the dental health component (DHC) of the index of orthodontic treatment need (IOTN). METHODS: A descriptive cross-sectional study was conducted among 500 (mean age 16.25 ± 1.09) adolescents randomly selected from the northern border region of Saudi Arabia (KSA). The northern border region is sub-divided into three governorates: Ar'ar (186), Rafha (142) and Turayf (172). The data were recorded in questionnaires to assess the prevalence of malocclusion and estimate of DHC of the IOTN index. RESULTS: The most common malocclusions in order of prevalence were Angle's Class I (52.8%), Angle's Class II (31.8%), Angle's Class III (15.4%), crowding (47.2%), excessive overjet (> 2 mm) (22.2%), reduced overjet (< 1 mm) (11.4%), excessive overbite (> 2 mm) (23.4%), reduced overbite (< 1 mm) (12.2%), anterior crossbite (4.8%), posterior crossbite (9.4%) and open bite (4.6%). The most common facial profiles determined in the sagittal plane, were the straight facial profile (49.2%), convex (42.6%) and concave (8.2%). The prevalence of Grade 1 and 2 DHC was 49.4%, Grade 3 was 29.6%, Grade 4 and 5 was 21%. The grades of DHC of IOTN index were as follows: 48.73% of males and 50.22% of females showed grades 1 and 2. Grade 3 was observed in 30.32% of males and 28.69% of females. Grades 4 and 5 were recorded in 20.93% of males and 21.07% of females. CONCLUSIONS: The prevalence of malocclusion and orthodontic treatment need among the north border region of KSA is comparable with that of other regional studies.

Global distribution of malocclusion traits: A systematic review.

OBJECTIVE: Considering that the available studies on prevalence of malocclusions are local or national-based, this study aimed to pool data to determine the distribution of malocclusion traits worldwide in mixed and permanent dentitions. METHODS: An electronic search was conducted using PubMed, Embase and Google Scholar search engines, to retrieve data on malocclusion prevalence for both mixed and permanent dentitions, up to December 2016. RESULTS: Out of 2,977 retrieved studies, 53 were included. In permanent dentition, the global distributions of Class I, Class II, and Class III malocclusion were 74.7% [31 - 97%], 19.56% [2 - 63%] and 5.93% [1 - 20%], respectively. In mixed dentition, the distributions of these malocclusions were 73% [40 - 96%], 23% [2 - 58%] and 4% [0.7 - 13%]. Regarding vertical malocclusions, the observed deep overbite and open bite were 21.98% and 4.93%, respectively. Posterior crossbite affected 9.39% of the sample. Africans showed the highest prevalence of Class I and open bite in permanent dentition (89% and 8%, respectively), and in mixed dentition (93% and 10%, respectively), while Caucasians showed the highest prevalence of Class II in permanent dentition (23%) and mixed dentition (26%). Class III malocclusion in mixed dentition was highly prevalent among Mongoloids. CONCLUSION: Worldwide, in mixed and permanent dentitions, Angle Class I malocclusion is more prevalent than Class II, specifically among Africans; the least prevalent was Class III, although higher among Mongoloids in mixed dentition. In vertical dimension, open bite was highest among Mongoloids in mixed dentition. Posterior crossbite was more prevalent in permanent dentition in Europe.

Prevalence of malocclusion in Canadian children with autism spectrum disorder.

INTRODUCTION: The purposes of this study were to determine the prevalence of malocclusion among children with autism spectrum disorder (ASD) and to describe the most common malocclusion traits in this population. METHODS: This cross-sectional study included patients diagnosed with ASD aged between 5 and 18 years. Randomly selected healthy children with the same demographic characteristics comprised the control group. Dental charts were reviewed to obtain the children's sociodemographic characteristics and type of occlusion. Information on each child's molar occlusion classification (Angle classification), midline deviation, crossbite, open bite, overbite, overjet, and crowding were recorded. The statistical analysis used descriptive analysis, the Pearson chi-square test, and multivariate logistic regression. RESULTS: Ninety-nine children comprised the ASD group, and 101 children were in the control group. Our results demonstrated a significantly higher prevalence of malocclusion in children with ASD compared with the control group (P <0.001). Patients with ASD were significantly more likely to have posterior crossbite (P = 0.03), increased overjet (P <0.0001), and severe maxillary crowding (P <0.01). Furthermore, children with ASD were more likely to have malocclusion than non-ASD children, independently of their demographic characteristics (odds ratio, 2.6; 95% confidence interval, 1.46, -4.65). CONCLUSIONS: The prevalence of malocclusion was higher among children with ASD. Posterior crossbite, increased overjet, and severe maxillary crowding were the most common malocclusion traits in these children.

Impacto del perfil facial en la apreciación de la personalidad / Impact of facial profile on personality assessment

Objetivo: determinar el impacto de los perfiles faciales y analizar si contribuyen a calificar a una persona de agradable, positiva, negativa, simpática, exitosa, alegre o amargada. Materiales y métodos: se modificó la fotografía de una paciente a fin de obtener cinco tipos de perfiles faciales, los cuales fueron evaluados mediante la escala de Likert por estudiantes de odontología, Los resultados fueron volcados en tablas con el programa Excel (Microsoft) y analizados mediante la prueba de ANOVA. Resultados: losperfiles de clase III fueron asociados a personas amargadas, menos exitosas, poco simpáticas y negativas. Los perfiles de clase II, a personas agradables, simpáticas, alegres y positivas. Los perfiles de clase I, a personas exitosas. Conclusiones: el perfil facial influye en la percepción de las personas. El perfil de clase III es asociado a valores socialmente negativos.

Assessment of Gender Dimorphism on Sagittal Cephalometry in Pakistani Population.

OBJECTIVE: To determine and compare the cephalometric values among Pakistani males and females using commonly used sagittal skeletal measurements (ANB, Wits appraisal, Beta-angle) and newly developed cephalometric analyses (Yen-angle and W-angle). STUDY DESIGN: Observational, cross-sectional study. PLACE AND DURATION OF STUDY: Orthodontic Department of Baqai Medical University, Karachi, Pakistan, from August to October 2013. METHODOLOGY: Atotal of 209 pre-treatment lateral cephalometric radiographs of orthodontic patients were selected from departmental records, comprised of 92 males and 117 females. Radiographs were traced for measurements of ANB, Wits appraisal, Beta-angle, W-angle and Yen-angle. Patients were categorized into skeletal classes I, II, and III on the basis of performed measurements, incisor classification, and profile recorded from their records. Descriptive analysis was used to obtain median interquartile range in both the genders and Mann-Whitney U-test was used to observe gender dimorphism. RESULTS: Skeletal class II was the most prevalent type of malocclusion. There were no difference in the obtained measurements between males and females except the Wits appraisal and Beta-angle in class II patients, which showed significant difference in values (p < 0.05). CONCLUSION: Pakistani population has no significant different difference in the craniofacial morphology of males and females, with the exception of Wits-appraisal and Beta-angle in class II cases.

Prevalence of occlusal traits and orthodontic treatment need in 14 year-old adolescents in Northeast Italy.

AIM: Studies on prevalence of malocclusion support the planning and provision of public dental services. The aim of the study was to assess the prevalence of malocclusion and occlusal traits in adolescents aged 14 years from public secondary schools in the area of Health District n.15 - Veneto region, Italy. STUDY DESIGN: Cross-sectional survey. METHODS: Out of a randomly selected sample of 1187 subjects, 444 adolescents (55% males, 45% females) were evaluated in the school settings according to the criteria adopted by Brunelle et al. [1996]. Alginate impressions were then taken for 380 students together with a wax bite. The occlusal traits of the cast were analysed and IOTN was established. RESULTS: The most common occlusal traits measured on casts were overjet >3 mm (48%), overbite >3 mm (39%), midline misalignment (32%), crowding (30%), 99% of the sample showed at least one occlusal trait. Class I molar relationship prevailed (75.5%) and the prevalence of molar asymmetries was 21.9%. The prevalence of anterior and posterior crossbite and open bite was significantly higher in females, while the mean values of overjet and overbite were higher in males. The distribution of IOTN in the study population showed that only 49.5% had no or little need of treatment, and more than one third (35.8%) were assigned a 4 or 5 score. STATISTICS: Descriptive statistics are expressed as a percentage (± confidence interval) or mean ± standard deviation, according to the nature of the variable. CONCLUSIONS: These outcomes indicate a high prevalence of the aforementioned occlusal traits and also a high need for orthodontic treatment among adolescents in Northeast Italy.

Occlusal characteristics in 3-year-old children--results of a birth cohort study.

BACKGROUND: Aim of this prospective study was to determine prevalence of malocclusion and associated risk factors in 3-year-old Thuringian children. METHODS: Subjects (n = 377) were participants in a regional oral health programme, a birth cohort study with the aim to prevent caries (German Clinical Trials Register DRKS00003438). Children received continuous dental care since birth. Occlusal characteristics (overjet, overbite, anterior open bite, canine relationship and posterior crossbite) were measured at the age of 3 years by one calibrated clinician using a vernier caliper (accuracy 0.1 mm; Münchner Modell 042-751-00, Germany). A regular parent survey was conducted to assess risk factors for development of malocclusion. RESULTS: Three hundred seventy seven children (mean age 3.31 ± 0.70 years; 52.5% male) were examined. Children had a mean overjet of 2.4 ± 0.8 mm and the mean overbite was 0.8 ± 1.2 mm; 58.8 % of the children had a normal overjet ≤ 3 mm and 88.8% a normal overbite with < [Formula: see text] overlap. Prevalence of malocclusion was 45.2% (10.9% anterior open bite, 41.2% increased overjet ≥ 3 mm, 40.8% Class II/III canine relationship, 3.4% posterior crossbite). All children who sucked the thumb had a malocclusion. Children who used a pacifier had greater odds of having a malocclusion at age of 3 years than children without pacifier use (OR = 3.36; 95% CI: 1.87-6.05). Malocclusion and dental trauma were associated, but not statistically significant (OR = 1.83; 95% CI: 0.99-3.34; p = 0.062). Malocclusion was not associated with gender, migration background, low socioeconomic status, preterm birth, special health care needs, breathing or dietary patterns (p > 0.05). CONCLUSIONS: Non-nutritive sucking habits were important risk factors for development of a malocclusion in the primary dentition.

Dentofacial characteristics of oral breathers in different ages: a retrospective case-control study.

BACKGROUND: This study aimed to investigate the dental and skeletal variables associated with disturbances of craniofacial development in oral-breathing (OB) individuals and the probability that these variables are related to this condition. METHODS: This is an observational retrospective case-control study of 1596 patients divided into three groups of age n1 5-12, n2 13-18, and n3 19-57 years. Radiographic, clinical, and models data were analyzed. The control group was consisted of nasal breathing (NB) individuals. Statistical analyses of the qualitative data were performed with x (2) test to identify associations, and odds ratio (OR) tests were performed for the variables that the chi-square test (x (2)) identified an association. RESULTS: In the descriptive analysis of the data, we observed that the class II malocclusion was the most frequent in the total sample, but when divided by age group and mode of breathing, there is a random division of these variables. In n1 group, class II, (OR = 2.02) short and retruded mandible (SM and RM) (OR = 1.65 and1.89) were associated with OB and it was considered a risk factor. In n2 group, class II (OR = 1.73), SM (OR = 1.87) and increased lower anterior height (ILAFH) (OR = 1.84) seemed to be associated and to be risk factors for OB. In the n1 group, decreased lower anterior facial height (DLAFH) and brachycephalic facial pattern (BP) seemed to be associated with NB and a protective factor against oral breathing. CONCLUSIONS: This study showed that dental and skeletal factors are associated with OB in children, and it seems that it becomes more severe until adolescence. But adults showed no associations between OB and skeletal factors, only in dental variables, indicating that there is no cause-effect relationship between the dental and skeletal factors and OB. The treatment of nose breathing patient should be multidisciplinary, since OB remains even when dental and skeletal factors slow down.

Influence of the socioeconomic status on the prevalence of malocclusion in the primary dentition.

OBJECTIVE: To assess the influence of socioeconomic background on malocclusion prevalence in primary dentition in a population from the Brazilian Amazon. METHODS: This cross-sectional study comprised 652 children (males and females) aged between 3 to 6 years old. Subjects were enrolled in private preschools (higher socioeconomic status - HSS, n = 312) or public preschools (lower socioeconomic status - LSS, n = 340) in Belém, Pará, Brazil. Chi-square and binomial statistics were used to assess differences between both socioeconomic groups, with significance level set at P < 0.05. RESULTS: A high prevalence of malocclusion (81.44%) was found in the sample. LSS females exhibited significantly lower prevalence (72.1%) in comparison to HSS females (84.7%), particularly with regard to Class II (P < 0.0001), posterior crossbite (P = 0.006), increased overbite (P = 0.005) and overjet (P < 0.0001). Overall, malocclusion prevalence was similar between HSS and LSS male children (P = 0.36). Early loss of primary teeth was significantly more prevalent in the LSS group (20.9%) in comparison to children in the HSS group (0.9%), for both males and females (P < 0.0001). CONCLUSION: Socioeconomic background influences the occurrence of malocclusion in the primary dentition. In the largest metropolitan area of the Amazon, one in every five LSS children has lost at least one primary tooth before the age of seven.

Occlusal characteristics of children with hypertrophied adenoids in Nigeria.

BACKGROUND: Nasorespiratory function and its relation to craniofacial growth are of great interest because of the basic biological relationship between form and function, and the accumulating findings of the relationship between mode of breathing, craniofacial growth and orthodontic treatment. OBJECTIVES: The aim of this study was to evaluate the effect of adenoid hypertrophy and sociodemographic variables on the occlusion of children. METHODOLOGY: A total of 180 subjects aged 3-12 years were selected at the Obafemi Awolowo University Teaching Hospital Complex, Ile-Ife, Nigeria. Ninety subjects had hypertrophied adenoids while 90 normal children served as the control group. Orthodontic examinations were carried out and impressions for study models taken. Occlusion was assessed in the anterior-posterior, transverse and vertical planes. RESULTS: Class I relationship was the most prevalent occlusion in both adenoid and control subjects (55.6% and 72.2%, respectively). The occurrence of class II division 1 was significantly higher among adenoid than control subjects (P=0.003). Posterior crossbites occurred significantly more in adenoid subjects in the 9-12 years category. In the vertical plane, the occurrence of deep bite was significantly greater in male than female adenoid subjects. Age had a statistically significant but weak correlation with anterior open bite (r=0.37). Age and BMI also had significant though weak correlations with posterior crossbite in female adenoid subjects (r=0.39 and r=0.36, respectively). Regression analysis also showed that age had a significant effect on the occurrence of anterior open bite, while BMI had a significant effect on the occurrence of class II occlusion in adenoid subjects (P<0.05). CONCLUSION: The presence of hypertrophied adenoids affects the occlusion in the three planes. Age and BMI have significant effects on the occurrence of anterior open bite and class II division 1 malocclusion respectively in adenoid subjects.

Prevalence of malocclusion and occlusal traits among adolescents and young adults in Rivers State, Nigeria.

BACKGROUND AND AIMS: A systematic and well-organized dental care program for any target population in a community requires some basic information, such as the prevalence of the condition to be assessed. Thus, the aims of this study were to determine the prevalence of malocclusion among predominantly Rivers State adolescents and to compare the results with other authors. METHODS: The sample which was randomly selected from seven secondary schools comprised 620 schoolchildren, 297 (48%) males and 323 (52%) females aged 13-20 years old with a mean age of 16.74 +/- 2.0 (SD) years. The children were examined for occlusal traits which included the occlusal antero-posterior relationship (Angles classification), overjet, overbite, openbite, crossbite, spacing and crowding. The Index of Complexity, Outcome and Need (ICON) protocol was employed in their classrooms using wooden spatulae and orthodontic millimeter rulers under natural illumination. None of the subjects had undergone any form of orthodontic treatment. RESULTS: Results showed that about 11.8% had normal occlusions, 80.3% had Class I malocclusions, 6.3% had Class II malocclusions (Div 1, 3.9%; Div 11, 2.4%) and 1.6% had Class III malocclusions. About 70% had normal overjets, normal overbite was seen in about 56%, whilst in the maxillary arch 14.4% had crowding and 60% spacing. Open bite was present in 7.1% while crossbite was found in 17.1%. Significant gender differences were found for overbite, overjet and Angles classification (P < 0.05). CONCLUSION: Angles Class I malocclusion is the predominant occlusal pattern among these students. This finding compares favorably with other studies done in other parts of Nigeria.

Occlusion and occlusal characteristics of primary dentition in North Indian children of East Lucknow region.

AIM: To determine occlusion and occlusal characteristics of the primary dentition in North Indian school-going children of East Lucknow region. STUDY DESIGN: A cross-sectional study was conducted on 453 participants in the age group of 3-6 years. METHODS: Participants were selected randomly and occlusal relationship was assessed based on Baume's classification. Various other occlusal characteristics were also recorded and assessed based on clinical and photographic evaluation. The data were then subjected to statistical analysis. RESULTS: Out of 453 participants examined, results revealed 62.3% had flush terminal plane; 31.3% mesial step molar relationship and 6.4% distal step molar relationship. It was also observed that 91.6% had Class I canine relationship, 93.4% primate spaces, 69.5% physiologic spaces. Amongst other occlusal characteristics, increased overbite and crowding were prevalent. Association of various occlusal characteristics and oral habits with respect to primary molar relation was also assessed. STATISTICS: Chi-square test was performed to carry out statistical analysis. p value <0.05 was taken as statistically significant. CONCLUSION: It was found that flush terminal plane relationship with spacing and Class I canine relationship predominated. Further prospective studies are required to provide an insight into patterns of occlusal relationship and its changes in Indian children.

Malocclusion and orthodontic treatment need evaluated among subjects with Down syndrome using the Dental Aesthetic Index (DAI).

OBJECTIVE: To determine the prevalence of malocclusion and need for orthodontic treatment among persons with Down Syndrome (DS). MATERIALS AND METHODS: Study participants were 113 persons with DS from the selected community-based rehabilitation center who fulfilled the inclusion and exclusion criteria. Ten occlusal characteristics of the Dental Aesthetic Index (DAI) were measured on study models to determine the degree of malocclusion. A single score represented the dentofacial anomalies, determined the level of severity, and determined the need for orthodontic treatment. RESULTS: Crowding in the anterior maxillary and mandibular arch was the main malocclusion problems among the subjects with DS. Comparison between age group and genders revealed no significant differences in four categories of orthodontic treatment need (P > .05). CONCLUSION: Most of the subjects with DS (94; 83.2%) had severe and very severe malocclusion, which indicated a desirable and mandatory need for orthodontic treatment.