scholarly journals Dental caries in primary and permanent teeth in children’s worldwide, 1995 to 2019: a systematic review and meta-analysis

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Mohsen Kazeminia ◽  
Alireza Abdi ◽  
Shamarina Shohaimi ◽  
Rostam Jalali ◽  
Aliakbar Vaisi-Raygani ◽  
...  
Keyword(s):  
Systematic Review ◽  
Dental Caries ◽  
Sample Size ◽  
Primary Teeth ◽  
Meta Analysis ◽  
Permanent Teeth ◽  
Significant Difference ◽  
The World ◽  
Review Study ◽  
Meta Regression Analysis

Abstract Background Early childhood caries (ECC) is a type of dental caries in the teeth of infants and children that is represented as one of the most prevalent dental problems in this period. Various studies have reported different types of prevalence of dental caries in primary and permanent teeth in children worldwide. However, there has been no comprehensive study to summarize the results of these studies in general, so this study aimed to determine the prevalence of dental caries in primary and permanent teeth in children in different continents of the world during a systematic review and meta-analysis. Methods In this review study, articles were extracted by searching in the national and international databases of SID, MagIran, IranMedex, IranDoc, Cochrane, Embase, ScienceDirect, Scopus, PubMed, and Web of Science (ISI) between 1995 and December 2019. Random effects model was used for analysis and heterogeneity of studies was evaluated by using the I2 index. Data were analyzed by using the Comprehensive Meta-Analysis (Version 2) software. Findings In this study, a total of 164 articles (81 articles on the prevalence of dental caries in primary teeth and 83 articles on the prevalence of dental caries in permanent teeth) were entered the meta-analysis. The prevalence of dental caries in primary teeth in children in the world with a sample size of 80,405 was 46.2% (95% CI: 41.6–50.8%), and the prevalence of dental caries in permanent teeth in children in the world with a sample size of 1,454,871 was 53.8% (95% CI: 50–57.5%). Regarding the heterogeneity on the basis of meta-regression analysis, there was a significant difference in the prevalence of dental caries in primary and permanent teeth in children in different continents of the world. With increasing the sample size and the year of study, dental caries in primary teeth increased and in permanent teeth decreased. Conclusion The results of this study showed that the prevalence of primary and permanent dental caries in children in the world was found to be high. Therefore, appropriate strategies should be implemented to improve the aforementioned situation and to troubleshoot and monitor at all levels by providing feedback to hospitals.

scholarly journals Aflatoxin M1 in Milk Worldwide from 1988 to 2020: A Systematic Review and Meta-Analysis

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Nader Salari ◽  
Mohsen Kazeminia ◽  
Aliakbar Vaisi-Raygani ◽  
Rostam Jalali ◽  
Masoud Mohammadi
Keyword(s):  
Systematic Review ◽  
Sample Size ◽  
Web Of Science ◽  
Animal Feed ◽  
Meta Analysis ◽  
Food Contamination ◽  
Aflatoxin M1 ◽  
Significant Difference ◽  
Animal Milk ◽  
Review Study

Background. Aflatoxins are found in various types of food and animal feed. Food contamination with aflatoxin toxin is of particular importance today. Various studies have reported different prevalence of aflatoxin M1 in animal milk. Therefore, due to the importance of this toxin, its role in health, and lack of general statistics about it worldwide, the present study aimed to determine the prevalence of aflatoxin M1 in milk worldwide with a systematic review and meta-analysis study. Methods. In this review study, national and international databases were extracted from SID, MagIran, IranMedex, IranDoc, Embase, ScienceDirect, Scopus, PubMed, and Web of Science (ISI) between January 1988 and February 2020. A random effects model was used for analysis, and heterogeneity of studies with an I2 index was investigated. Data were analyzed using Comprehensive Meta-Analysis (version 2). Results. The prevalence of aflatoxin M1 in milk worldwide from January 1988 to February 2020 in 122 articles with a sample size of 18921 was 79.1% (95% CI: 75.5–82.3%). Regarding the heterogeneity based on metaregression, there was a significant difference between the effect of the year of study (p≤0.001) and sample size (p≤0.001) with the prevalence of aflatoxin M1 in animal milk. Conclusion. The results of this study show that the prevalence of aflatoxin M1 in milk is high worldwide. Therefore, considering the importance of the milk group and its products, special measures should be taken to protect the ration from aflatoxin molds and milk quality.

scholarly journals Bond Strength of Self-Adhesive Flowable Composites and Glass Ionomer Cements to Primary Teeth: A Systematic Review and Meta-Analysis of In Vitro Studies

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6694
Author(s):  
Flavia Iaculli ◽  
Alessandro Salucci ◽  
Gianni Di Giorgio ◽  
Valeria Luzzi ◽  
Gaetano Ierardo ◽  
...  
Keyword(s):  
Systematic Review ◽  
Bond Strength ◽  
Primary Teeth ◽  
Meta Analysis ◽  
Deciduous Teeth ◽  
Glass Ionomer Cements ◽  
Glass Ionomer ◽  
Significant Difference ◽  
Flowable Composites

Background: Conventional composites are largely used in pediatric restorative dentistry and demonstrate successful clinical outcomes. However, the need for simplification of operative steps in young or uncooperative children demands reliable alternatives. Therefore, the aim of the present systematic review and meta-analysis was to evaluate the in vitro bond strength of glass ionomer cements (GICs) and self-adhesive flowable composites (SFCs) on deciduous teeth. Methods: A comprehensive literature search according to the PRISMA checklist was manually and electronically performed by two independent reviewers through the following databases: MEDLINE/PubMed, Google Scholar, Scopus, and Embase, to include in vitro studies comparing GICs and SFCs bond strength values of restorations on primary teeth. In addition, three groups of meta-analyses were conducted using random-effects models. Results: Three articles meeting the inclusion criteria were selected and subjected to both qualitative and quantitative assessment. No statistically significant difference was found between SFC versus GIC; however, both groups significantly differed with conventional flowable composites (CFs). Conclusions: Despite the absence of significant difference in bond strength values, SFCs may be considered a valid alternative to GICs in the restoration of deciduous teeth, although CFs proved better in vitro performances.

scholarly journals The global prevalence of osteoporosis in the world: a comprehensive systematic review and meta-analysis

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Nader Salari ◽  
Hooman Ghasemi ◽  
Loghman Mohammadi ◽  
Mohammad hasan Behzadi ◽  
Elham Rabieenia ◽  
...  
Keyword(s):  
Systematic Review ◽  
Sample Size ◽  
Meta Analysis ◽  
Government Agencies ◽  
Significance Level ◽  
Her Family ◽  
Social Burden ◽  
The World ◽  
Age Range ◽  
Prevalence Of Osteoporosis

Abstract Background Osteoporosis affects all sections of society, including families with people affected by osteoporosis, government agencies and medical institutes in various fields. For example, it involves the patient and his/her family members, and government agencies in terms of the cost of treatment and medical care. Providing a comprehensive picture of the prevalence of osteoporosis globally is important for health policymakers to make appropriate decisions. Therefore, this study was conducted to investigate the prevalence of osteoporosis worldwide. Methods A systematic review and meta-analysis were conducted in accordance with the PRISMA criteria. The PubMed, Science Direct, Web of Science, Scopus, Magiran, and Google Scholar databases were searched with no lower time limit up till 26 August 2020. The heterogeneity of the studies was measured using the I2 test, and the publication bias was assessed by the Begg and Mazumdar’s test at the significance level of 0.1. Results After following the systematic review processes, 86 studies were selected for meta-analysis. The sample size of the study was 103,334,579 people in the age range of 15–105 years. Using meta-analysis, the prevalence of osteoporosis in the world was reported to be 18.3 (95% CI 16.2–20.7). Based on 70 studies and sample size of 800,457 women, and heterogenicity I2: 99.8, the prevalence of osteoporosis in women of the world was reported to be 23.1 (95% CI 19.8–26.9), while the prevalence of osteoporosis among men of the world was found to be 11.7 (95% CI 9.6–14.1 which was based on 40 studies and sample size of 453,964 men.). The highest prevalence of osteoporosis was reported in Africa with 39.5% (95% CI 22.3–59.7) and a sample size of 2989 people with the age range 18–95 years. Conclusion According to the medical, economic, and social burden of osteoporosis, providing a robust and comprehensive estimate of the prevalence of osteoporosis in the world can facilitate decisions in health system planning and policymaking, including an overview of the current and outlook for the future; provide the necessary facilities for the treatment of people with osteoporosis; reduce the severe risks that lead to death by preventing fractures; and, finally, monitor the overall state of osteoporosis in the world. This study is the first to report a structured review and meta-analysis of the prevalence of osteoporosis worldwide.

Dental caries in children with attention deficit/hyperactivity disorder: a meta-analysis

2021 ◽  
Author(s):  
Victor Zanetti Drumond ◽  
Gabriela Luíza Nunes Souza ◽  
Mateus José de Carvalho Pereira ◽  
Ricardo Alves Mesquita ◽  
Maryam Amin ◽  
...  
Keyword(s):  
Systematic Review ◽  
Attention Deficit Hyperactivity Disorder ◽  
Dental Caries ◽  
Attention Deficit ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Children With Adhd ◽  
Hyperactivity Disorder ◽  
Significant Difference ◽  
Dmft Index

Objectives: To evaluate whether children with attention deficit/hyperactivity disorder (ADHD) are more affected by dental caries than children without ADHD by means of a systematic review and meta-analysis. Design: Electronic searches was performed in four databases (PubMed, Embase, Scopus, and Web of Science) in July 2021. Grey literature search in OpenGrey, a search in Google Scholar, and searches in the reference list of included articles were also conducted. The eligibility criteria were observational studies in which children with ADHD were compared with children without ADHD with respect to the dental caries. Study selection, data extraction, and risk of bias assessment, applying the Joanna Briggs tool were performed by two reviewers independently. Meta-analysis and assessment of heterogeneity among studies were conducted with the meta-package of RStudio using the R programming language (R Core Team, Vienna, Austria). Results of meta-analysis were provided in mean difference (MD), odds ratio (OR), and confidence intervals (CI). For assessment of heterogeneity, Baujat plot and influence analysis plot were obtained. Results: Thirteen studies were included and 10 were incorporated into meta-analyses. The meta-analysis showed that children with ADHD had a higher decayed, missing, and filled teeth (DMFT) index than their peers without ADHD (I²=42%; MD=0.75 [0.38-1.13]). For decayed, missing, and filled surfaces (DMFS) (I²=0; MD=0.39 [-0.02-0.80]) and decayed surfaces (DS/ds) (I²=0%; MD=0.35 [-0.63-1.33]), no difference between groups was observed. In addition, children with ADHD had higher odds of having dental caries than their healthy peers (OR = 3.31 [1.25, 8.73]; I² = 0%). After assessment of heterogeneity among studies, sensitivity analysis was conducted for DMFT. One study was removed and the significant difference between groups remained. Children with ADHD had a significantly higher DMFT index than their peers without ADHD (MD = 0.98 [CI = 0.75, 1.20]; I² = 0%) Risk of bias ranged from low to high. Conclusion: The main shortcoming of the included studies is the high risk of bias regarding the strategies to deal with confounding factors. Within its limitations, this systematic review and meta-analysis demonstrated that children with ADHD were more likely to develop dental caries than their healthy counterparts. Funding: No funding Registration: CRD42021238923

scholarly journals The worldwide prevalence of the Dupuytren disease: a comprehensive systematic review and meta-analysis

2020 ◽  
Vol 15 (1) ◽  
Author(s):  
Nader Salari ◽  
Mohammadbagher Heydari ◽  
Masoud Hassanabadi ◽  
Mohsen Kazeminia ◽  
Nikzad Farshchian ◽  
...  
Keyword(s):  
Systematic Review ◽  
Sample Size ◽  
Meta Analysis ◽  
Total Sample ◽  
World Health ◽  
Palmar Fascia ◽  
The World ◽  
Patients With Diabetes ◽  
Health Organization ◽  
Dupuytren Disease

Abstract Background The Dupuytren disease is a benign fibroproliferative disorder that leads to the formation of the collagen knots and fibres in the palmar fascia. The previous studies reveal different levels of Dupuytren’s prevalence worldwide; hence, this study uses meta-analysis to approximate the prevalence of Dupuytren globally. Methods In this study, systematic review and meta-analysis have been conducted on the previous studies focused on the prevalence of the Dupuytren disease. The search keywords were Prevalence, Prevalent, Epidemiology, Dupuytren Contracture, Dupuytren and Incidence. Subsequently, SID, MagIran, ScienceDirect, Embase, Scopus, PubMed and Web of Science databases and Google Scholar search engine were searched without a lower time limit and until June 2020. In order to analyse reliable studies, the stochastic effects model was used and the I2 index was applied to test the heterogeneity of the selected studies. Data analysis was performed within the Comprehensive Meta-Analysis Software version 2.0. Results By evaluating 85 studies (10 in Asia, 56 in Europe, 2 in Africa and 17 studies in America) with a total sample size of 6628506 individuals, the prevalence of Dupuytren disease in the world is found as 8.2% (95% CI 5.7–11.7%). The highest prevalence rate is reported in Africa with 17.2% (95% CI 13–22.3%). According to the subgroup analysis, in terms of underlying diseases, the highest prevalence was obtained in patients with type 1 diabetes with 34.1% (95% CI 25–44.6%). The results of meta-regression revealed a decreasing trend in the prevalence of Dupuytren disease by increasing the sample size and the research year (P < 0.05). Conclusion The results of this study show that the prevalence of Dupuytren disease is particularly higher in alcoholic patients with diabetes. Therefore, the officials of the World Health Organization should design measures for the prevention and treatment of this disease.

Selective, stepwise, or nonselective removal of carious tissue: which technique offers lower risk for the treatment of dental caries in permanent teeth? A systematic review and meta-analysis

2019 ◽  
Vol 24 (2) ◽  
pp. 521-532 ◽  
Author(s):  
Myrna Maria Arcanjo Frota Barros ◽  
Maria Imaculada De Queiroz Rodrigues ◽  
Francisco Wilker Mustafa Gomes Muniz ◽  
Lidiany Karla Azevedo Rodrigues
Keyword(s):  
Systematic Review ◽  
Dental Caries ◽  
Lower Risk ◽  
Meta Analysis ◽  
Permanent Teeth

scholarly journals Global prevalence of myasthenia gravis and the effectiveness of common drugs in its treatment: a systematic review and meta-analysis

2021 ◽  
Vol 19 (1) ◽  
Author(s):  
Nader Salari ◽  
Behnaz Fatahi ◽  
Yalda Bartina ◽  
Mohsen Kazeminia ◽  
Reza Fatahian ◽  
...  
Keyword(s):  
Systematic Review ◽  
Myasthenia Gravis ◽  
Sample Size ◽  
Plasma Exchange ◽  
Meta Analysis ◽  
Research Question ◽  
Random Effect Model ◽  
Positive Effects ◽  
The World ◽  
Positive Effect

Abstract Background Myasthenia gravis is a neuromuscular autoimmune disorder characterized by weakness and disability in the voluntary muscles. There have been several preliminary studies on the epidemiology of myasthenia gravis in different parts of the world and the effectiveness of common drugs in its treatment, but there has been no comprehensive study of the efficacy of common drugs in the treatment of myasthenia gravis. Therefore, this study aimed to determine the epidemiology of myasthenia gravis globally and the effectiveness of common drugs in its treatment using systematic review and meta-analysis. Methods Research studies were extracted from IranDoc, MagIran, IranMedex, SID, ScienceDirect, Web of Sciences (WoS), ProQuest, Medline (PubMed), Scopus and Google Scholar based on Cochran's seven-step guidelines using existing keywords extracted in MeSH browser. The I2 test was used to calculate the heterogeneity of studies, and Begg and Mazumdar rank correlation tests were used to assess publication bias. Data were analyzed using Comprehensive Meta-Analysis software (Version 2). Results In the search for descriptive studies based on the research question, 7374 articles were found. After deleting articles unrelated to the research question, finally, 63 articles with a sample size of 1,206,961,907 people were included in the meta-analysis. The prevalence of MG worldwide was estimated to be 12.4 people (95% CI 10.6–14.5) per 100,000 population. For analytical studies on the effectiveness of common myasthenia gravis drugs, 4672 articles were found initially, and after removing articles unrelated to the research question, finally, 20 articles with a sample size of 643 people in the drug group and 619 people in the placebo group were included in the study. As a result of the combination of studies, the difference between the mean QMGS score index after taking Mycophenolate and Immunoglobulin or plasma exchange drugs in the group of patients showed a significant decrease of 1.4 ± 0.77 and 0.62 ± 0.28, respectively (P < 0.01). Conclusion The results of systematic review of drug evaluation in patients with myasthenia gravis showed that Mycophenolate and Immunoglobulin or plasma exchange drugs have positive effects in the treatment of MG. It also represents the positive effect of immunoglobulin or plasma exchange on reducing SFEMG index and QMGS index and the positive effect of Mycophenolate in reducing MG-ADL index, SFEMG and Anti-AChR antibodies index. In addition, based on a meta-analysis of the random-effect model, the overall prevalence of MG in the world is 12.4 people per 100,000 population, which indicates the urgent need for attention to this disease for prevention and treatment.

scholarly journals Assessing the Clinical Improvement in Patients with COVID-19 using Lopinavir-Ritonavir: A Systematic Review

2021 ◽  
pp. 448-459
Author(s):  
Rania M. Magadmi
Keyword(s):  
Systematic Review ◽  
Statistical Analysis ◽  
Clinical Improvement ◽  
Quantitative Data ◽  
Meta Analysis ◽  
Viral Therapy ◽  
Significant Difference ◽  
Review Study ◽  
Review Manager ◽  
Anti Viral Therapy

Aims: Globally the focus is towards finding an effective treatment for COVID-19 patients in order to suppress the spread of this pandemic disease. An antiviral combination of lopinavir-ritonavir is considered to be effective in treating COVID-19 patients. Therefore, the present study aims to assess the clinical improvements of lopinavir-ritonavir in COVID-19 patients. Study Design: a systematic review study was conducted and articles published since December 2019 were included. The statistical analysis of quantitative data was performed using Review Manager (RevMan) to generate forest plots. Results: The study showed that there was no significant difference in COVID-19 patients treated with lopinavir-ritonavir or in combination with anti-viral therapy or other conventional methods. Conclusion: the use of lopinavir-ritonavir resulted in greater adverse consequences among COVID-19 patients. It further recommends conducting meta-analysis studies with a greater number of studies to highlight the clinical improvement associated with the use of Lopinavir-ritonavir.

scholarly journals Aplicação do Laser na Cariologia: diagnóstico, prevenção e tratamento

2019 ◽  
Vol 8 (6) ◽  
Author(s):  
Ana Luzia Araújo Batista ◽  
Thamyres Maria Silva Simões ◽  
Maria das Graças Barbosa da Silva ◽  
Maria Helena Chaves de Vasconcelos Catão
Keyword(s):  
Systematic Review ◽  
Laser Irradiation ◽  
Primary Teeth ◽  
Er:Yag Laser ◽  
Meta Analysis ◽  
Laser Fluorescence ◽  
Caries Detection ◽  
Permanent Teeth ◽  
Topical Fluoride

Nas últimas décadas, um dos grandes avanços na Área da Saúde foi o desenvolvimento dos aparelhos de Laser, que possibilitou uma nova abordagem nos procedimentos odontológicos. A Laserterapia tem diversas aplicabilidades na Cariologia, seja como método de diagnóstico, como auxiliar nas medidas preventivas ou como tratamento da cárie dentária. Portanto, o objetivo desta revisão é proporcionar uma leitura atualizada da aplicabilidade da Laserterapia na Cariologia e, para tanto, foi realizada uma revisão literária sistematizada, na base de dados MEDLINE – Pubmed, abrangendo os últimos anos. Mediante esse estudo literário e considerando a evolução dos estudos científicos, ainda existem controvérsias a respeito da eficácia clínica do Laser na Cariologia.Descritores: Lasers; Cárie Dentária; Flúor.ReferênciasSichani AV, Javadinejad S, Ghafari R. Diagnostic value of DIAGNOdent in detecting caries under composite restorations of primary molars. Dent Res J. 2016;13(4):327-32.Montedori A, Abraha I, Orso M, D'errico PG, Pagano S, Lombardo G. Lasers for caries removal in deciduous and permanent teeth. Cochrane Database Syst Rev. 2016;26(9):CD010229.Nagata JY, Hioka N, Kimura E, Batistela VR, Terada RS, Graciano AX et al. Antibacterial photodynamic therapy for dental caries: evaluation of the photosensitizers used and light source properties. Photodiagnosis Photodyn Ther. 2012;9(2):122-31.Bahrololoomi Z, Fotuhi  Ardakani F, Sorouri M. In vitro comparison of the effects of diode laser and co2 laser on topical fluoride uptake in primary teeth. J Dent (Tehran). 2015;12(8):585-91.Nokhbatolfoghahaie H, Alikhasi M, Chiniforush N, Khoei F, Safavi N, Yaghoub Zadeh B. Evaluation of Accuracy of DIAGNOdent in Diagnosis of Primary and Secondary Caries in Comparison to Conventional Methods. J Lasers Med Sci. 2013; 4(4):159-67.Melo M, Pascual A, Camps I, Del Campo Á, Ata-Ali J. Caries diagnosis using light fluorescence devices in comparison with traditional visual and tactile evaluation: a prospective study in 152 patients. Odontology. 2017;105(3):283-90.Gimenez T, Braga MM, Raggio DP, Deery C, Ricketts DN, Mendes FM. Fluorescence-based methods for detecting caries lesions: systematic review, meta-analysis and sources of heterogeneity. PLoS One. 2013;8(4):e60421.Kositbowornchai S, Sukanya C, Tidarat T, Chanoggarn T. Caries detection under composite restorations by laser fluorescence and digital radiography. Clin Oral Investig. 2013; 17(9):2079-84.Rosa MI, Schambeck VS, Dondossola ER, Alexandre MC, Tuon L, Grande AJ, Hugo F. Laser fluorescence of caries detection in permanent teeth in vitro: a systematic review and meta-analysis. J Evid Based Med. 2016;  9(4):213-24.Heravi F, Ahrari F, Mahdavi M, Basafa S. Comparative evaluation of the effect of Er:YAG laser and low level laser irradiation combined with CPP-ACPF cream on treatment of enamel caries. J Clin Exp Dent. 2014;6(2):e121-26.Mang TS, Tayal DP, Baier R. Photodynamic therapy as an alternative treatment for disinfection of bacteria in oral biofilms. Lasers Surg Med. 2012;44(7):588-96.Fornaini C, Brulat N, Milia G, Rockl A, Rocca JP. The use of sub-ablative Er:YAG laser irradiation in  prevention of dental caries during orthodontic treatment. Laser Ther. 2014;23(3):173-81.Karandish M. The efficiency of laser application on the enamel surface: a systematic review. J Lasers Med Sci. 2014;5(3):108-14.Twetman S, Axelsson S, Dahlén G, Espelid I, Mejàre I, Norlund A et al. Adjunct methods for caries detection: a systematic review of literature. Acta Odontol Scand. 2013;71(3-4):388-97.Bahrololoomi Z, Lotfian M. Effect of diode laser irradiation combined with topical fluoride on enamel microhardness of primary teeth. J Dent (Tehran). 2015;12(2):85-9.Ramos-Oliveira TM, Ramos TM, Esteves-Oliveira M, Apel C, Fischer H, Eduardo CP et al. Potential of CO2 lasers (10.6 µm) associated with fluorides in inhibiting human enamel erosion. Braz Oral Res. 2014;28(1):1-6.Souza-Gabriel AE, Turssi CP, Colucci V, Tenuta LM, Serra MC, Corona SA. In situ study of the anticariogenic potential of fluoride varnish combined with CO2 laser on enamel. Arch Oral Biol. 2015;60(6):804-10.

scholarly journals Consortium genome-wide meta-analysis for childhood dental caries traits

2017 ◽  
Author(s):  
Simon Haworth ◽  
Dmitry Shungin ◽  
Justin T van der Tas ◽  
Strahinja Vucic ◽  
Carolina Medina Gomez ◽  
...  
Keyword(s):  
Dental Caries ◽  
Genetic Variants ◽  
Primary Teeth ◽  
Meta Analysis ◽  
Genetic Effects ◽  
Permanent Dentition ◽  
Permanent Teeth ◽  
Common Disease ◽  
Genome Wide ◽  
Common Genetic Variants

AbstractPrior studies suggest dental caries traits in children and adolescents are partially heritable, but there has been no large-scale consortium genome-wide association study (GWAS) to date. We therefore performed GWAS for caries in participants aged 2.5-18.0 years from 9 contributing centers. Phenotype definitions were created for the presence or absence of treated or untreated caries, stratified by primary and permanent dentition. All studies tested for association between caries and genotype dosage (imputed to Haplotype Reference Consortium or 1000 Genomes phase 1 version 3 panels) accounting for population stratification. Fixed–effects meta-analysis was performed weighted by inverse standard error. Analysis included up to 19,003 individuals (7,530 affected) for primary teeth and 13,353 individuals (5,875 affected) for permanent teeth. Evidence for association with caries status was observed at rs1594318-C for primary teeth (intronic within ALLC, Odds Ratio (OR) 0.85, Effect Allele Frequency (EAF) 0.60, p 4.13e-8) and rs7738851-A (intronic within NEDD9, OR 1.28, EAF 0.85, p 1.63e-8) for permanent teeth. Consortium-wide estimated heritability of caries was low (h2 of 1% [95% CI: 0%:7%] and 6% [95% CI 0%:13%] for primary and permanent dentitions, respectively) compared to corresponding within-study estimates (h2 of 28%, [95% CI: 9%:48%] and 17% [95% CI:2%:31%]) or previously published estimates. This study was designed to identify common genetic variants with modest effects which are consistent across different populations. We found few single variants associated with caries status under these assumptions. Phenotypic heterogeneity between cohorts and limited statistical power will have contributed; these findings could also reflect complexity not captured by our study design, such as genetic effects which are conditional on environmental exposure.Author summaryDental caries (tooth decay) is a common disease in children. Previous studies suggest genetic factors alter caries risk, but to date there is a gap of knowledge in identifying which specific genetic variants are responsible. We undertook analysis in a consortium including around 19,000 children and investigated whether any of 8 million common genetic variants were associated with risk of caries in primary (milk) or permanent teeth. If identified, these variants are used as ‘tags’ to highlight genes which may be involved in a disease. We identified variants in two loci associated with caries status; in the primary (rs1594318) and permanent dentition (rs7738851). The former is intronic in ALLC, a gene with poorly understood function. The latter is an intronic variant within NEDD9, a gene which has several known functions including a role in development of craniofacial structures. To gain a more comprehensive understanding of genetic effects which influence caries larger studies and a better understanding of environmental modifiers or interactions with genetic effects are required.

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