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Table of Contents   
REVIEW ARTICLE
Year : 2021  |  Volume : 11  |  Issue : 3  |  Page : 256-265
Prevalence of dental caries in the Indian population: A systematic review and meta-analysis


1 Conservative Dentistry and Endodontics, King George’s Medical University, Lucknow, Uttar Pradesh, India
2 Department of Periodontology, Regional Institute of Medical sciences, Imphal, Manipur, India
3 Oral Pathology, King George Medical University, Lucknow, Uttar Pradesh, India
4 Department of Community Medicine, Dr. Ram Manohar Lohia Institute of Medical Sciences, Lucknow, Uttar Pradesh, India

Date of Submission05-Feb-2021
Date of Decision19-Feb-2021
Date of Acceptance19-Mar-2021
Date of Web Publication10-Jun-2021

Correspondence Address:
Dr. Diksha Singh
Oral Pathology, King George Medical University, Lucknow, Uttar Pradesh. 226003
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/jispcd.JISPCD_42_21

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   Abstract 

Objectives: To evaluate the pooled prevalence of dental caries among Indian population through systematic review and meta-analysis. Materials and Methods: A keyword search was conducted in PubMed, Science Direct, Google Scholar, Cochrane, and Scopus databases using relevant key words to extract the data pertaining to dental caries in Indian population. The search criteria included manuscripts published in English language from March 2009 to March 2019 and employed standard Boolean operators. The studies which met the inclusion criteria were independently reviewed by two researchers and their quality was assessed by the Newcastle–Ottawa Scale. The overall prevalence was deduced using the random effects model with prime focus given to the site of anatomical origin. R software version 3.5.2. was used for statistical analysis. Results: Post screening, out of the 253 articles identified, 70 met the inclusion criteria and were used to generate the meta-analysis. Among them, only few studies investigated the prevalence of root caries (n = 1). Overall prevalence of dental caries was 54.16% (CI: 0.4966–0.5866), whereas age-specific prevalence was 62% in patients above 18 years and 52% among 3–18 years of age (P < 0.0001). Maximum overall prevalence was noted in mixed dentition (58%). Region wise prevalence was more in western India (72%). Use of decayed, missed, and filled teeth as diagnostic criteria for early childhood caries was only 29%. Conclusions: Besides an overall prevalence of 54.16%, there exists a remarkable variation in dental caries prevalence rates as per age, diagnostic criteria, dentition, and geographical region. Furthermore, research should be focused on the prevalence of anatomical site specific caries as well.


Keywords: Dental caries, DMFT, India, prevalence


How to cite this article:
Pandey P, Nandkeoliar T, Tikku A P, Singh D, Singh MK. Prevalence of dental caries in the Indian population: A systematic review and meta-analysis. J Int Soc Prevent Communit Dent 2021;11:256-65

How to cite this URL:
Pandey P, Nandkeoliar T, Tikku A P, Singh D, Singh MK. Prevalence of dental caries in the Indian population: A systematic review and meta-analysis. J Int Soc Prevent Communit Dent [serial online] 2021 [cited 2021 Sep 27];11:256-65. Available from: https://www.jispcd.org/text.asp?2021/11/3/256/318009



   Introduction Top


Dental caries is a chronic disease displaying drastic variations in its prevalence across multiple factors and the obscurity of data on the same hinders the attainment of dental caries prevalence reduction goals set by WHO.[1] Considering the evolving dietary patterns in last few decades, globalization has been linked to increased consumption of sugar and growing obesity in middle and low income countries.[2] Some studies in developing countries such as India report a prevalence rate of 36.7% among 13–19 year olds while others like Saudi Arabia state prevalence to be as high as 83% among 6–8 year olds.[1],[3] Untreated dental caries can cause pain and difficulties in eating and sleeping, pain, which in turn leads to emergency dental visit, hospitalization, need for invasive treatment, and systemic health problems thereby lowering the quality of life.[4] Caries of the permanent teeth was reportedly the most common oral condition as per the Global Burden of Disease Study of 2017.[5] Globally, around 2.4 billion people suffer from caries of the permanent teeth and 486 million children suffer from caries of the primary teeth.[6]

The scenario in India is no different from other developed or developing countries.[2] The available literature on the prevalence of dental caries in India shows a varied picture with prevalence of caries being very high in some areas and low in some areas.[6],[7],[8],[9],[10] In India, there are infinite number of studies done on the prevalence of dental caries.[6],[7],[8],[9],[10] However, only a few of them focused on dental caries across different age groups.[11],[12],[13],[14] The dentist population ratio in India ranges from 1:1000 to 1:20,000 across different states.[15] Annually, 30,570 dentists are produced in India; however, only 10% of dentists serve the rural people.[16] With a poor dentist to population ratios in some areas, the chances of dental caries going undiagnosed are highly likely, contributing the regional disparity in dental caries prevalence rates.[11] Hence a true prevalence rate needs to be elucidated in order to address the growing concern of dental caries.

Further, only a few systematic reviews on dental caries have been reported among Indian population.[17],[18],[19],[20] However, each study has its own limitations such as the use of a limited number of articles, extraction of published reports from few electronic databases, lack of complete analysis, or unavailability of recently published articles. Few systematic reviews have focused on only children or the elder population. Dental caries can be a lifelong condition which affects children, adolescents, and adults in various forms. Manifestation of dental caries in later stages of life is likely considering the increased prevalence of gingival recession and root caries as people grow older.[21] Evidence suggests that high salivary microbial counts are found in elderly populations which may facilitate the manifestation of dental caries.[22] To the best of our knowledge, there was no data on the pooled prevalence of dental caries among Indian population from different age groups, geographical region, dentition, and diagnostic criteria. Hence, the study aimed to evaluate the prevalence of dental caries across the aforementioned characteristics in the Indian population.

Aims and objective

Participants from the ages of 3–75 years and hailing from different parts of India were covered in this meta-analysis of 70 studies to elucidate the overall prevalence of dental caries as well as its distribution pattern across different age groups, geographical regions, type of dentition, and the diagnostic criteria used. The findings of which are elemental in delineating the risk factors of dental caries and vulnerable sub-populations in India along with ascertaining current gaps in the scientific literature on dental caries.


   Materials and Methods Top


A systematic review and meta-analysis of the literature on dental caries was conducted to determine its prevalence among the Indian population of varying age groups. The study protocol adopted was registered in PROSPERO (CRD42019132489) and followed the Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA) guidelines.

Search strategy

Research articles published between March 2009 and March 2019 were screened using databases such as PubMed, Science Direct, Google Scholar, Cochrane, and Scopus. Search strings used for electronic screening of databases included the following: prevalence, dental caries, India, DMFT, cavitated lesion, non-cavitated lesion, root caries, incisor caries, smooth surface caries, occlusal caries, proximal caries, DMF, early childhood caries, geriatric caries, premolar caries, molar caries, canine caries, coronal caries, pit and fissure caries, linear enamel caries, and age group ranging from 3 to 75 years.

Inclusion/exclusion criteria

Full-text articles published in English during the last decade were screened for analysis. The inclusion criteria composed of observational studies (case–control, cohort, and cross-sectional) conducted on the prevalence of dental caries in India, on patient population aged 3–75 years. Investigations with nonspecific data, inadequately designed, editorials, letters, case reports, conference proceedings, and the grey literature, ongoing observational studies, reviews, and studies that did not report statistical tests for dental caries were excluded from the study analysis.

Data extraction

After deduplication, the studies were screened for eligibility by two independent investigators to identify “potentially eligible” studies and the disagreements were resolved by consensus after discussion. The inter-reliability score was assessed by Cohen’s Kappa (0.00943). The information from the eligible studies were extracted which encompassed author’s name, year of publication, participants, population characteristics (age range and dentition), geographic location, type of dental caries, diagnostic criteria of dental caries, and prevalence percent of dental caries as per age group.

Quality assessment

The quality of the studies that formed the basis of meta-analysis was assessed by adopting the Newcastle–Ottawa Scale (NOS) comprising three components (methodology, comparability based on study design, outcome). Based on this criterion, the study quality was graded on a 10-point scale. Studies with scores less than 5 were considered to have low methodological quality, scores of 5 to 7 indicated moderate quality, and those above 7 were considered as high quality.

Data analysis

Statistical analyses were performed using the R software, version 3.5.2. A random effects model was employed in all meta-analysis procedures. Forest-plots were used to demonstrate the effect of each study and the summary effect size. For effect size estimates, standard errors of its logarithm were calculated from the reported or estimated CIs, assuming that the effect size was log-normally distributed. The prevalence of dental caries was extracted from individual studies and combined using the generic inverse variance method of Der Simonian and Laird random effects model. The heterogeneity of effect size among studies was quantified using I2. The influence analysis was performed by removing one study at a time to evaluate whether the pool estimates could have been altered by a single study. Subgroup analyses were conducted as per mean age, region, diagnostic criterion for estimating dental caries (DMFT), dentition, and type of dental caries. To investigate publication bias, funnel plots were constructed. The distribution of study risk estimates across the funnel plot was examined visually and Egger’s test for small study effects was performed to assess the degree of asymmetry. A P < 0.05 was considered statistically significant.


   Results Top


On electronic screening as described in [Figure 1], 253 relevant publications were found. Among the databases explored, Google scholar yielded the most articles (n = 170), followed by PubMed (n = 62), science direct (n = 15), Scopus (n = 4), and Cochrane Library (n = 2). Initially, 115 duplicate records were excluded using EndNote which created a separate list of duplicate references that were reviewed by investigators for de-duplication. Subsequently, another 43 articles were excluded after scrutinizing the abstracts, thereby yielding 95 articles, the full texts of which were assessed for eligibility. Two independent reviewers on screening the remaining data, finally included 70 articles in this meta-analysis after excluding 25 articles due to studies lacking the prevalence rate of dental caries, no specification of DMFT index and age not matching with the inclusion criteria.[8],[9],[13],[23],[24],[25],[26],[27],[28],[29],[30],[31],[32],[33],[34],[35],[36],[37],[38],[39],[40],[41],[42],[43],[44],[45],[46],[47],[48],[49],[50],[51],[52],[53],[54],[55],[56],[57],[58],[59],[60],[61],[62],[63],[64],[65],[66],[67],[68],[69],[70],[71],[72],[73],[74],[75],[76],[77],[78],[79],[80],[81],[82],[83],[84],[85],[86],[87]
Figure 1: Flowchart of the eligibility criteria as per PRISMA

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Characteristics of included studies

Vast spatial distribution of studies was observed, with almost all regions of India except the northeast finding representation [Figure 2]. Prevalence of crown caries was observed in 69 studies and 8 studies reported of early childhood caries. The evaluation of dental caries was conducted through clinical examinations, in accordance with DMFT and WHO criteria mainly.
Figure 2: Geographical distribution pattern of the 70 studies included in the meta-analysis on prevalence of dental caries

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Quality assessment

The quality assessment using NOS depicted 12 studies to have low methodological quality, whereas 52 studies were of moderate methodological quality and only six studies demonstrated high methodological quality.

Overall prevalence of dental caries meta-analysis

The overall prevalence of the dental caries calculated using the random effects model was 54.16% (SD 0.0229, 95% CI: 0.4966–0.5866). The test for heterogeneity produced Tau square of 0.04, Q(P < 0.0001), I2 =99.57% (95% CI: 99.4121–99.7012), H square = 232.32 (95% CI: 170.1101–334.6652). [Figure 3] illustrates the forest plot for each of the studies examined and the overall prevalence of dental caries in India.
Figure 3: Forest plot depicting study specific prevalence (mean and 95% CI) for dental caries in Indian population

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Prevalence of dental caries by subgroup analysis meta-analysis

Studies were divided into various subgroups such as age, dentition, geographic location, estimation of caries using a diagnostic index and type of dental caries, to check for any possible heterogeneity.

[Figure 4] illustrates the subgroup analysis by age which was further divided into three categories. The overall prevalence of dental caries observed in the age range of 3–18 years was 52%. The test for heterogeneity produced Tau square of 0.0330, Q(P < 0.0001), I2 =99.5365% (95% CI: 99.3520–99.6907), H square = 215.7641 (95% CI: 154.3266–323.3308). The maximum and minimum prevalence of dental caries observed in the age range of 3–18 years were 95 and 7%, respectively.[9],[77]
Figure 4: Forest plot depicting specific age-group prevalence (mean and 95% CI) for dental caries in Indian population

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Similarly, the overall prevalence of dental caries observed in the age range of >18 years was 62%. The test for heterogeneity produced Tau square of 0.0519, Q(P < 0.0001), I2 = 99.5250% (95% CI: 98.8461–99.9014), H square = 210.5069 (95% CI: 86.6651–1014.4179).

Subgroup analysis by type of dental caries depicted that the overall prevalence of crown caries was 57%, overall prevalence of dental caries was maximum in the mixed dentition (58%) followed by the primary (54%) and permanent dentition (46%). Furthermore, the overall prevalence of dental caries was observed to be higher in western India (72%) followed by northern India (57%), central India (56%), and 51% in the southern India. The lowest prevalence of dental caries, however, was observed in eastern India (36%). However, research paucity could have been the possible explanation for the low prevalence in Eastern India.

The test for heterogeneity (for type of dental caries, diagnostic criteria for estimating dental caries, dentition, region) produced Tau square of 0.0329, Q(P < 0.0001), I2 = 99.38% (95% CI: 99.11–99.58), H square = 159.52 (95% CI: 112.63–242.27).

Meta-analysis for dmft by subgroup analysis

Random-effect model revealed the prevalence of DMFT index as a diagnostic criterion in the estimation of dental caries in the age group of 3–18 years to be 57%. In patients aged above 18 years its usage was much higher at 77%. The prevalence of DMFT index in the overall diagnosis of crown caries was observed to be 62%. In early childhood caries, the prevalence of DMFT index was comparatively low at 29%. The prevalence of DMFT index as diagnostic criterion of dental caries in primary dentition was 59%. While in mixed dentition and permanent dentition the prevalence rates of DMFT for diagnosis of dental caries were 66 and 43%, respectively. Eastern India observed the highest overall prevalence of DMFT as diagnostic criteria for estimating dental caries at 72% followed by western part of India (60%), southern (59%), and north India (58%).

The test for heterogeneity (for age, type of dental caries, dentition, region) produced Tau square of 0.0288, Q(P < 0.0001), I2 = 99.30% (95% CI: 98.9145–99.6016), H square = 143.09 (95% CI: 92.1239–250.9946).

Publication bias and meta regression analysis

The regression test on both the random-effect (without moderators) and mixed-effect (with the 6 moderators) generated P > 0.05, indicating no funnel plot asymmetry and hence, no publication bias. The absence of publication bias in the present study is depicted by the even scattering of smaller studies at the base of the funnel in [Figure 5].
Figure 5: Funnel plot for all studies

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The non-parametric rank-based test (trim and fill test) on random-effect model (without parameter model) also suggested symmetry (hence, no publication bias) and no missing studies. The Egger’s regression intercept was −5.417, 95% CI (−13.061, −2.227), t = −1.398 and P = 0.1663, indicating funnel plot symmetry and lack of publication bias.

Results of meta-regression analysis indicated that none of the included subgroups influenced the size of the average true effect. Approximately, 9.62% of the total amount of heterogeneity can be accounted for by including the 6 moderators (region, design, caries type, dentition, age, and year of study). Remaining 90.28% of variability was due to other factors not included in this study. The test for residual heterogeneity was significant (QE = 12340.4190, df = 55, P < 0.0001), possibly indicating that other moderators (such as the sample population and gender) not considered in the model were influencing the prevalence of caries.


   Discussion Top


Multitude of studies have been undertaken on the prevalence of caries among children and adolescents; however, a comprehensive insight into prevalence rates of dental caries across different age groups, type of dental caries, geographical regions, dentition, and diagnostic criterion for estimating dental caries (DMFT) has remained unexplored. Hence, this systematic review and meta-analysis set out to fill these lacunae.

As per our review and analysis, the overall prevalence of dental caries in Indian population aged between 3 and 75 years was 54.16%. This finding is in congruence with results of the National Oral Health Survey in India which noted a prevalence of 53.8%.[88]

Although most studies have focused on dental caries in populations under 18, an age-specific prevalence of 62% in patients above 18 years and 52% among 3–18 year olds (P < 0.0001) was observed. Janakiram et al. reported a mean prevalence of 49% in 5–12 year olds, with a steady increase of 60% to 84% in 15 years olds and 65–74 year group, respectively.[21] Age-specific increase in dental caries can also be attributed to poor health seeking behaviors among adults, inadequate time for self-care, substance abuse, presence of comorbidities, and absence of organized programs that target prevention and reduction of dental caries in India.[19],[89],[90],[91],[92]

In reference to prevalence of dental caries across different types of dentition, highest overall prevalence was noted in the mixed dentition (58%) category, followed by the primary (54%) type. This points towards the slow increment in prevalence of caries in the transitory period between primary and mixed dentition, as dental caries takes time to manifest as clinically detectable lesions and impact of changing dietary patterns.[93]

On assessing the geographical distribution of dental caries prevalence rates in India, the region wise prevalence was notably high in western India (72%). However, this is in dissonance with a meta-analysis by Janakiram et al. who found that the dental caries prevalence was markedly higher in North India among all age groups compared with the other parts of India.[21] This variation in inter-regional estimates can arise depending on the socio-economic parameters of the areas surveyed and the food practices pertaining to that region.[94]

The 77% prevalence of DMFT index in the diagnosis of crown caries in adults and corresponding 29% for early childhood caries emphasizes the availability and adoption of numerous newer and age-specific indices such as ICADAS, AAPD, EAPD, DEFT, and PUFA in diagnosis of caries among children. Use of DMFT index showed significant variations across other corollary parameters such as type of dental caries, dentition, and geographical region studied. The simplicity and convenient application of DMFT have made the most widely used and preferred diagnostic index for dental caries in large epidemiological surveys or in pre-operative assessments.[95]

This review has its limitations. The literature was restricted to a particular time frame, language, and could not comprehensively cover assessment of clinical symptoms, etiology, and treatment protocols associated with dental caries and thereby limiting our ability to evaluate all possible outcomes. Exclusion of studies due to incoherence in the dentition status of sampled patients further limited the number of studies analyzed. Despite these shortcomings, this systematic review and meta-analysis was able to avoid publication bias and present a cohesive understanding of dental caries prevalence among the Indian population.


   Conclusion Top


Present findings suggest that the prevalence of dental caries is a pressing health concern affecting at least half of the Indian population. Age-specific subgroup analysis highlights the need for better preventive oral care programs and awareness campaigns among adults for pertinent management of dental caries. Taking note of the regional disparities in prevalence rates can help in better targeting of interventions and health policy formulation. In addition, the lack of anatomical site-specific investigation was observed during the literature collection and research should be focused on the prevalence of anatomical site specific caries as well.

Acknowledgements

Nil.

Financial support and sponsorship

This manuscript did not receive any funding from public or private sectors.

Conflicts of interest

The authors have no conflict of interests to disclose.

Authors contributions

First author contributed to the concepts, design, literature search, data acquisition, screening of articles, exclusion of ineligible studies, data analysis and manuscript review stages. Second author contributed to the literature search, data acquisition, screening of articles, exclusion of ineligible studies, data analysis, statistical analysis and manuscript review. Third author contributed to the concepts, design, definition of intellectual content, data analysis and manuscript review. Fourth author contributed to the concepts, manuscript preparation, manuscript editing and manuscript review. Fifth author contributed to the design, manuscript preparation, editing and review.

Ethical policy and institutional review board statement

Not applicable.

Patient declaration of consent

Not applicable.

Data availability statement

The data set used in the current study has been sourced from PubMed, Google Scholar and Science direct, Cochrane, and Scopus indexed articles. Besides the data mentioned in the article, additional data can be made available on request.

 
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