scholarly journals A Systematic Review and Meta-Analysis on Bolton's Ratios: Normal Occlusion and Malocclusion

2019 ◽  
Author(s):  
Vanessa Machado ◽  
João Botelho ◽  
Paulo Mascarenhas ◽  
José João Mendes ◽  
Ana Delgado
Keyword(s):  
Assessment Tool ◽  
Meta Analysis ◽  
Credible Interval ◽  
Class Ii ◽  
Class I ◽  
Mean Deviation ◽  
Class Iii ◽  
Cross Sectional ◽  
Mean Values ◽  
Normal Occlusion

Introduction: The purposes of this study were to seek for overall ratio (OR) and anterior ratio (AR) patients data in normal occlusion and Angle’s malocclusion studies, and to assess if such results support Bolton’s standards as general references. Methods: Pubmed, Medline, CENTRAL and Scholar databases were searched up to February 2018 (CRD42018088438). Gray literature was explored through OpenGray. Non-randomized clinical studies, published in English and assessing Bolton’s OR and AR in normal occlusion and Angle’s malocclusion groups (Class I, Class II, Class II division 1, Class 2 division 2, Class III) patients were included. OR and AR means and standard deviations (SD) were collected. Potential covariates (study design, publication year, country where the study was conducted, number of cases, gender, mesiodistal measurement method, and calibration method) were also extracted. The National Health Heart Lung, and Blood Institute’s Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies was used to assess each included studies quality. Pairwise Random-Effects and Multilevel Bayesian Network Meta-Analyses were used to synthesize available data. Results: Fifty-two observational studies were included (8872 participants; male/females 2674/3272; 16 studies lacked gender information). For normal occlusion, global pooled estimates for OR and AR means were 91.74% (95% CI: 91.37-92.10) and 78.24% (95% CI: 77.85-78.63), respectively. We could identify on Angle’s Class III patients meaningful OR and AR mean deviations from normal occlusion (0.89, 95% credible interval [CrI], 0.66-1.12, and 0.66, 95% CrI, 0.38-0.94, respectively), while on Class I patients we found a meaningful mean deviation from normal occlusion only for OR (0.25, 95% CrI, 0.03-0.47). Concerning gender impact, male patients presented higher OR (0.30, 95% CI 0.00-0.59) and AR (0.41, 95% CI 0.00-0.83) mean values than females in Class I. Conclusions: The results show that global pooled OR and AR mean values for normal occlusion patients are slightly above Bolton’s original values. Class I, for OR mean values, and Class III, for both OR and AR, are proportionally larger than normal occlusion patients. Gender had almost no impact on teeth mesiodistal proportion.

scholarly journals A systematic review and meta-analysis on Bolton’s ratios: Normal occlusion and malocclusion

2019 ◽  
Vol 47 (1) ◽  
pp. 7-29
Author(s):  
Vanessa Machado ◽  
João Botelho ◽  
Paulo Mascarenhas ◽  
José João Mendes ◽  
Ana Delgado
Keyword(s):  
Assessment Tool ◽  
Meta Analysis ◽  
Credible Interval ◽  
Class Ii ◽  
Mean Deviation ◽  
Class Iii ◽  
Cross Sectional ◽  
Mean Values ◽  
Normal Occlusion ◽  
Meta Analyses

Introduction: The purpose of this study was to seek and summarise the Bolton overall index (OI) and anterior index (AI) regarding normal occlusion and Angle’s malocclusion according to gender, and to assess if these indices support Bolton’s standards as general references. Methods: PubMed, LILACS, Embase, CENTRAL and Google Scholar databases were searched up to June 2019 (CRD42018088438). Non-randomised clinical studies, published in English and assessing Bolton’s OI and/or AI in normal occlusion and Angle’s malocclusion groups, were included. OI and AI means, sample size and SDs were collected. The National Heart, Lung, and Blood Institute’s Quality Assessment Tool for Observational Cohort and Cross-Sectional Studies was used to assess the risk of bias. Pairwise random-effects and multilevel Bayesian network meta-analyses were used to synthesise available data. Results: Fifty-three observational studies were included (11,411 participants; 3746 men, 4430 women; 15 studies lacked gender information). For normal occlusion, pooled estimates for OI and AI means were 91.78% (95% confidence interval [CI] = 91.42–92.14; I2 = 92.87%) and 78.25% (95% CI = 77.87–78.62; I2 = 90.67%), respectively. We could identify in Angle’s Class III patients meaningful OI and AI mean deviations from normal occlusion (0.76, 95% credible interval [CrI] = 0.55–0.98 and 0.61, 95% CrI = 0.35–0.87, respectively), while in Class II patients we found a meaningful mean deviation from normal occlusion only for OI (−0.28, 95% CrI = −0.52–−0.05). Concerning gender impact, male patients presented higher OI (0.30, 95% CI = 0.00–0.59) and AI (0.41, 95% CI = 0.00–0.83) mean values than female patients in Class I. Conclusion: Normal occlusion OI and AI mean values differ from Bolton’s original values. Class II division 2, for OI mean values, and Class III, for both OI and AI, are proportionally larger than normal occlusion patients. Gender had almost no impact on teeth mesiodistal proportion.

Prevalence of Malocclusions in Autistic Patients in Isfahan

2021 ◽  
Author(s):  
Zahra Ali Mehtari ◽  
Mehdi Rafiei ◽  
Saeed Azarbayjani ◽  
Neda Ahmadi Rouzbehani ◽  
Amir Hossain Moeini
Keyword(s):  
Class Ii ◽  
Autism Spectrum ◽  
Open Bite ◽  
Class I ◽  
Dental Student ◽  
Class Iii ◽  
Cross Sectional ◽  
Deep Bite ◽  
Normal Occlusion ◽  
Age Range

Introduction: Autism spectrum disorder (ASD) is a group of neurodevelopmental disorders diagnosed by impairments in social interaction and communication with repetitive and restrictive stereotyped behavioral patterns. The Prevalence of autism has been reported to be increased in recent years. This study aimed to assess the prevalence of different types of malocclusion among ASD patients in Isfahan in 2018. Materials & Methods: In a descriptive and cross-sectional trial, 92 ASD patients were studied in the age range of 7-18 years at the center for autism patients in Isfahan. Clinical oral examinations of patients are taken to assess the involved malocclusions (Cl I, Cl II and Cl III malocclusions) and malocclusion traits (deep bite, open bite and cross bite) by an educated dental student under the supervision of an orthodontist under natural light. The data are reported using frequency and percentage indices. Results: Class I malocclusion had the highest prevalence 54.3% (50) among ASD patients and the prevalence of class II and class III were found to be 19.6% (18) and 7.6% (7) respectively. The frequency of malocclusions traits of deep bite, cross bite and the open bite were 27.2% (25), 18.5% (17) and 7.6% (7) respectively. Among of the total patients, 65.2% (60) showed normal bite and 18/5% (17) showed Normal occlusion. Conclusion: ASD patients showed class I, class II and class III malocclusions from the most to least frequency and the most frequent malocclusion traits were also deep bite, cross bite and open bite respectively.

Prevalence of Malocclusion among School Children of Biratnagar, Nepal

2021 ◽  
Vol 11 (1) ◽  
pp. 46-48
Author(s):  
Nidhi Giri ◽  
Anand Acharya ◽  
Kanika Yadav
Keyword(s):  
School Children ◽  
Class Ii ◽  
Cross Sectional Study ◽  
Class I ◽  
Class Iii ◽  
Cross Sectional ◽  
Total Study Population ◽  
Medical College ◽  
Normal Occlusion ◽  
Study Population

Introduction: Various forms of malocclusion are a matter of serious concern in Nepalese population. This study was carried out to understand the prevalence of malocclusion among the school children of Biratnagar. The objective of this research is to find out the prevalence of malocclusion of children from different schools of Biratnagar visiting the Pedodontics and Orthodontics department of Nobel Medical College and Teaching Hospital, Biratnagar. Materials and Method: A descriptive cross sectional study method was used in this research. Data was collected by using direct observation of the subjects and occlusal assessment was done according to Angle’s classification and Dewey’s modification types of class I, class II and class III malocclusion. Result: Subjects with normal occlusion was found to be 39 % and with malocclusion was found to be 61%. Among them, class I malocclusion (60%) and angles class II div I subjects (88.33%) were in majority of the total study population. Conclusion: The present study helps to determine the prevalence of malocclusion and need of orthodontic treatment for the school children of Biratnagar

scholarly journals The prevalence of orthodontic treatment need and malocclusion problems in 8–9-year-old schoolchildren: A study in the south of Thailand

2019 ◽  
Vol 9 ◽  
pp. 99-104 ◽  
Author(s):  
Sirate Rapeepattana ◽  
Angkana Thearmontree ◽  
Supanee Suntornlohanakul
Keyword(s):  
Orthodontic Treatment ◽  
Class Ii ◽  
Mixed Dentition ◽  
Class I ◽  
Class Iii ◽  
The South ◽  
Cross Sectional Survey ◽  
Cross Sectional ◽  
Treatment Need ◽  
Normal Occlusion

Aims This study aims to find the prevalence of orthodontic treatment need and malocclusion problems in 8–9-year-old schoolchildren in the south of Thailand. Materials and Methods A number of 202 children (100 boys and 102 girls) samples were randomly selected from all schools in Hat Yai District, Songkhla Province, Thailand. A cross-sectional survey of dental health component (DHC) of the Index of Orthodontic Treatment Need (IOTN) and malocclusion problems was investigated by clinical examination and dental model. Results Levels 4 and 5 of orthodontic treatment need according to DHC of IOTN of the sample were presented in 18.8% and 1.49%, respectively. Children who need orthodontic treatment (Grade 2–4) showed more than one highest DHC problem that indicated the level of treatment need (39.68%). Normal occlusion was found at 6.43%. Malocclusions such as Class I, Class II division 1, Class II division 2, and Class III malocclusion were observed in 78.71%, 7.92%, 3.47%, and 3.47%, respectively. Reversed overjet and overjet >9 mm were detected in 5.64% and 1.58%, respectively. Approximately half of the children (46.67%) had overbite >3.5 mm. Conclusions High percentage of children in mixed dentition period who need orthodontic treatment was found in this study. Some children who presented with the orthodontic treatment need Grade 2–4 had more than one DHC problem which identified the grade of treatment need. Class I malocclusion was most frequently found in this group of children.

scholarly journals Prevalence of malocclusion among the age group of 15-25 years in Bangladeshi population

2018 ◽  
pp. 8-11
Author(s):  
Shamim Jubayer ◽  
Md Abdul Kader ◽  
Salma Sharmin ◽  
Nasrin Sultana ◽  
Mohammad Shamim Al Mamun
Keyword(s):  
Oral Care ◽  
Class Ii ◽  
Cross Sectional Study ◽  
Class I ◽  
Age Group ◽  
Class Iii ◽  
Cross Sectional ◽  
Standard Format ◽  
Normal Occlusion ◽  
Bangladeshi Population

Aims: A cross sectional study was carried out to explore the Prevalence of malocclusion among the age group of 15-25 years in Bangladeshi population.Material and methods: A total of 431 samples were purposively selected.  Data were collected by oral examination, model and face to face interview using the structured questionnaire and a standard format was prepared to record the data.Results: The responded of the study were 17 to 25 years. Their mean ages were 20.64 ±1.61 years.  Male 33% and female 67%. Among the respondent 82.6% have class I molar relation, 12.06% class II and 5.34 % class III molar relation. Among class I group 74% have malocclusion and 26% normal occlusion that is 78.42% respondent has malocclusion.  In residential status 86% are urban. 96% of the respondent brushes their tooth two times and 4% once regularly. 13% of the respondent never visits dental chamber in their life time.Conclusion: Most common malocclusion was class I followed by class II and class III. The systemic implementation of preventive oral care and community oriented health programs are needed for the continuous promotion of oral health care of Bangladesh.Ban J Orthod & Dentofac Orthop, April 2014; Vol-4 (1-2), P.8-11

scholarly journals Overall and Anterior Tooth Size Ratios in a Group of Emiratis

2018 ◽  
Vol 12 (1) ◽  
pp. 655-663 ◽  
Author(s):  
Moaza Ghuloom Mohammad ◽  
Shazia Naser-ud Din ◽  
Amar Hassan Khamis ◽  
Athanasios E. Athanasiou
Keyword(s):  
Class Ii ◽  
Anterior Tooth ◽  
Class I ◽  
Tooth Size ◽  
Class Iii ◽  
Mean Values ◽  
Normal Occlusion ◽  
Size Discrepancy ◽  
Tooth Size Discrepancy ◽  
Dental Casts

Objectives:The aims of this investigation in a group of Emiratis were (1) To study overall and anterior tooth size ratios in Class I normal occlusion, (2) To estimate overall and anterior tooth size ratios in different malocclusion groups, (3) To compare overall and anterior tooth size ratios in Class I normal occlusion with the Bolton standards, and (4) To determine the distribution of overall and anterior tooth size ratios ± 2 SD from Bolton mean values in all occlusion groups.Materials and Methods:In this cross-sectional investigation, consecutive patients’ files, including dental casts, were selected from the archives of orthodontic clinics of the Dubai Health Authority. The final sample was formed following the application of specific inclusion criteria. The sample consisted of 521 pairs of dental casts representing both sexes (males: 188; females: 333) and different malocclusion groups (Class I: 288; Class II: 110; Class III: 30) and Class I normal occlusion (93). The mean age of patients was 16.18y for Class I, 15.73y for Class II, 15.83y for Class III, and 16.55y for Class I normal occlusion. The dental casts were scanned and digitized by the first author using the Ortho Insight 3D laser scanner. Measurements were made regarding maxillary and mandibular sums of mesiodistal tooth dimension of the overall (6-6) and anterior (3-3) groups of teeth. Statistical analysis included descriptive statistics, pairedt-test and Analysis of Variance (ANOVA). The level of significance was set atp<0.05.Results:There were statistically significant differences among malocclusion groups with regard to overall and anterior tooth size ratios. However, the comparison between the Class I normal occlusion group and the Bolton standards showed no statistically significant differences. Only five cases in Class II malocclusion presented an anterior tooth size discrepancy outside plus 2 SD from Bolton mean values and one case in Class I malocclusion presented with an overall tooth size discrepancy outside plus 2 SD from Bolton mean values.Conclusion:This study of the different occlusion groups of the Emirati sample concluded that (a) Class I normal occlusion cases presented similar overall and anterior tooth size ratios to Bolton standards; (b) Overall and anterior tooth size ratios among different malocclusion groups exhibited statistically significant differences; (c) Five cases in Class II malocclusion presented an anterior tooth size discrepancy outside plus 2 SD from Bolton mean values, and (d) One case in Class I malocclusion presented an overall tooth size discrepancy outside plus 2 SD from Bolton mean values.

scholarly journals Prevalence of Malocclusion Among Medical Students in Institute of Medicine, Nepal: A Preliminary Report

2011 ◽  
Vol 1 (1) ◽  
pp. 24-27
Author(s):  
Basanta K Shrestha ◽  
Rajiv Yadav ◽  
Rajesh Gyawali ◽  
Sanjay Gupta
Keyword(s):  
Medical Students ◽  
Age Groups ◽  
Class Ii ◽  
Class I ◽  
Institute Of Medicine ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Cross Sectional ◽  
Standard Format ◽  
Normal Occlusion

Introduction: Malocclusion is a malrelationship between the arches in any of the planes or in which there are anomalies in tooth position beyond the normal limits. The epidemiological data has a key role in planning which varies among different countries, ethnic groups and age groups. Aims and objective: To find out the prevalence of malocclusion among medical students of IOM. Materials and method: Quantitative, cross-sectional descriptive study among MBBS students of Maharajgunj Medical Campus from first year to final year was done; participating voluntarily. A standard format was prepared to record the data. Result: Normal occlusion was found to be in 9.6%. The prevalence of Class I, Class II and Class III malocclusion were 44.09 %, 30.1 % and 16.12 % respectively. The various occlusal traits included increased overjet (12.9 %), increased overbite (26.9 %), scissor bite (3.2 %), posterior crossbite (18.3 %), spacing (12.9 %), Crowding (51.5 %), missing teeth (18.3 %). Conclusion: The prevalence of normal occlusion is 9.6% and malocclusion is found to be 90.4%. Class I malocclusion is most prevalent followed by Class II malocclusion and the Class III malocclusion.

scholarly journals Prevalence of malocclusion among school Children of Kathmandu, Nepal

2019 ◽  
Vol 9 (1) ◽  
pp. 59-62
Author(s):  
Manju Bajracharya ◽  
Sunanda Sundas ◽  
Resina Pradhan ◽  
Surendra Maharjan
Keyword(s):  
School Children ◽  
Cross Sectional Study ◽  
Mixed Dentition ◽  
Class I ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Cross Sectional ◽  
Normal Occlusion ◽  
Significant Difference ◽  
Study Population

Introduction: this study was carried to understand Prevalence of malocclusion among the school children of Kathmandu, Sorakhutte residing near school during mixed dentition period. A sample of 600 children ; 365 male, 235 female in age group of 6-13yrs was selected randomly from different school of Kathmandu city. The aim of our study is to find out prevalence of malocclusion among the mixed detention children of Kathmandu. Materials & Method: Data was collected using direct observation of the subjects, Descriptive cross-sectional study method was used in this research. Occlusal assessment were done according to angle’s classification and dewey’s modification type of class I, class III malocclusion. Result: Subjects with normal occlusion was found to be 59.3% and with malocclusion was found to 40.7%. Among them class I malocclusion was majority of (57%) of study population, crowded incisors and significant difference was observed between male and female in the study. Conclusion: This study helps to access the prevalence malocclusion and need of orthodontic treatment for the mixed dentition period children.

Optimizing Outcomes in Emergency Room Thoracotomy: A 20-Year Experience in an Urban Level I Trauma Center

2010 ◽  
Vol 76 (4) ◽  
pp. 406-410 ◽  
Author(s):  
Gerardo Gomez ◽  
Alison Fecher ◽  
Theresa Joy ◽  
Ivanesa Pardo ◽  
Lewis Jacobson ◽  
...  
Keyword(s):  
Overall Survival ◽  
Electrical Activity ◽  
Emergency Room ◽  
Meta Analysis ◽  
Pulseless Electrical Activity ◽  
Class Ii ◽  
Class I ◽  
Class Iii ◽  
Current Period ◽  
Level I

Emergency room thoracotomy (ERT) has remained a last resort tool of resuscitation in the management of patients with major trauma. The medical records of all patients undergoing ERT for penetrating chest trauma from January 1, 2000 through April 30, 2008 were retrospectively reviewed. The data from this study were added to data collected in two previous studies conducted at our institution for meta-analysis. A total of 102 ERTs were performed. There were 28 Class I patients (27.4%), 58 Class II (56.8%), six Class III (5.8%), and 11 Class IV (10.7%). The number of ERTs performed on Class I patients has decreased from 58.3 per cent in the 1995 group to 35.4 per cent in the 1999 group. There was an overall survival of 7.8 per cent in the current period of review. Overall survival in the 1995 group was 2.5 per cent, 1999 was 2.7 per cent, and 2008 was 7.8 per cent. The majority of the survival benefit occurs in patients who have electrical activity and a blood pressure when examined in the emergency department (Class III and IV). We intend to do future prospective research to further clarify the Class II patients when evaluating the type of rhythm shown on electrocardiogram tracing to move away from the generic pulseless electrical activity category.

scholarly journals Cranial base characteristics in anteroposterior malocclusions: A meta-analysis

2015 ◽  
Vol 86 (4) ◽  
pp. 668-680 ◽  
Author(s):  
Aixiu Gong ◽  
Jing Li ◽  
Zhendong Wang ◽  
Yuan Li ◽  
Fang Hu ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Class Ii ◽  
Cranial Base ◽  
Class I ◽  
Cochrane Library ◽  
Base Length ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Base Angle ◽  
Statistical Heterogeneity

ABSTRACT Objective:  To investigate cranial base characteristics in malocclusions with sagittal discrepancies. Materials and Methods:  An electronic search was performed in PubMed, Embase, Web of Science, and the Cochrane Library. A fixed- or random-effect model was applied to calculate weighted mean difference with 95% confidence intervals (CIs) according to statistical heterogeneity. Outcome measures were anterior, posterior, and total cranial base length and cranial base angle. Sensitivity analysis and publication bias were conducted. Results:  Twenty studies that together included 1121 Class I, 1051 Class II, and 730 Class III cases qualified for the final analysis. Class III malocclusion demonstrated significantly reduced anterior (95% CI: −1.74, −0.53; P &lt; .001 vs Class I; 95% CI: −3.30, −2.09; P &lt; .001 vs Class II) and total cranial base length (95% CI: −3.33, −1.36; P &lt; .001 vs Class I; 95% CI: −7.38, −4.05; P &lt; .001 vs Class II). Further, Class II patients showed significantly greater anterior and total cranial base length than did Class I patients (95% CI: 0.51, 1.87; P &lt; .001 for SN; 95% CI: 2.20, 3.30; P &lt; .001 for NBa). Cranial base angle was significantly smaller in Class III than in Class I (95% CI: −3.14, −0.93; P &lt; .001 for NSBa; 95% CI: −2.73, −0.68; P  =  .001 for NSAr) and Class II malocclusions (95% CI: −5.73, −1.06; P  =  .004 for NSBa; 95% CI: −6.11, −1.92; P &lt; .001 for NSAr) and greater in Class II than in Class I malocclusions (95% CI: 1.38, 2.38; P &lt; .001 for NSBa). Conclusions:  This meta-analysis showed that anterior and total cranial base length and cranial base angle were significantly smaller in Class III malocclusion than in Class I and Class II malocclusions, and that they were greater in Class II subjects compared to controls.

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