|Year : 2018 | Volume
| Issue : 2 | Page : 108-112
Pattern of dental caries in 3–6-year-old children using decayed, missing, filled surface index and hierarchical caries pattern system: A descriptive study
GD Chandan, Sweta Saraf, Nagaveni Sangavi, Anushree Khatri
Department of Pediatric and Preventive Dentistry, V.S Dental College, Bengaluru, Karnataka, India
|Date of Web Publication||2-Jul-2018|
Department of Pediatric and Preventive Dentistry, V.S Dental College, Bengaluru, Karnataka
Source of Support: None, Conflict of Interest: None
| Abstract|| |
Background and Objectives: The dental caries status of a population group with permanent dentition is traditionally described using decayed, missing, and filled teeth or surface (DMFT or DMFS) index, and the corresponding index for the primary dentition is dmft or dmfs. dmf value alone has certain limitations; therefore, additional measures to describe dental caries are important. Poulsen and Horowitz in 1997 described a hierarchical method to determine the severity of dental caries. Aim of the Study: The aim of the study was to determine the pattern of dental caries in 3–6-year-old children using Poulsen and Horowitz hierarchical system and to assess the usefulness of this system. Methodology: Data were collected from 500, 3–6-year-old children. Dmfs was recorded according to World Health Organization criteria 2013. On the basis of the caries recordings, the dmfs score of each child was calculated and each child was assigned to one of the six zones of increasing caries severity, ranging from 0 (caries free) to 5 (most severe). Statistical Analysis Used: The collected data were tabulated and analyzed using Student's t-test, ANOVA, and Pearson's correlation coefficient. Results: The overall mean dmfs for the study population was 9.10. The distribution of children according to the severity zones of Poulsen and Horowitz indicates a very low percentage (17.8%) of caries-free children and also a high percentage of children with caries in severity zone 2 (33.4%) and 4 (18.6%). Conclusion: The Poulsen and Horowitz model gives broader aspect for the assessment of severity of dental caries in 3–6-year-old children.
Keywords: Caries pattern, hierarchical system, primary dentition
|How to cite this article:|
Chandan G D, Saraf S, Sangavi N, Khatri A. Pattern of dental caries in 3–6-year-old children using decayed, missing, filled surface index and hierarchical caries pattern system: A descriptive study. J Indian Soc Pedod Prev Dent 2018;36:108-12
|How to cite this URL:|
Chandan G D, Saraf S, Sangavi N, Khatri A. Pattern of dental caries in 3–6-year-old children using decayed, missing, filled surface index and hierarchical caries pattern system: A descriptive study. J Indian Soc Pedod Prev Dent [serial online] 2018 [cited 2019 Sep 21];36:108-12. Available from: http://www.jisppd.com/text.asp?2018/36/2/108/235676
| Introduction|| |
Dental caries is an important dental public health problem and is the most prevalent chronic disease of the childhood. Caries in primary dentition is known to be a sign of high risk of caries in permanent dentition; it is therefore important to identify those children affected with caries. It has been reported that caries distribution follows a typical pattern in the primary dentition. The pattern of dental caries varies not only with age, sex, race, feeding habits, oral hygiene practices, geographical location, and socioeconomic status but also within the oral cavity. All the teeth and all the surfaces are not equally susceptible to caries. It is therefore important to know the relative caries susceptibility of the teeth in the maxillary and the mandibular arch. There is not much data about the association of pattern of early dental caries with the caries progression in preschool children. Specific and distinct patterns of caries attack might indicate a distinct etiology or are most likely associated with the subsequent development of carious lesions on other surfaces of teeth. Hence, a detailed knowledge of caries patterns is important. In a population with permanent dentition, the dental caries status is traditionally described using mean values of decayed, missing, and filled teeth or surfaces (DMFT or DMFS), which was originally described by Klein, Palmer, and Knutson in 1938. The corresponding index used for the primary dentition is def or dmf. This index requires recording the condition of every tooth or tooth surface in the dentition. However, there are certain principal limitations with this kind of index. The assessment of the caries experience in a given sample is often been done by taking an average of the index rather than assessment of severity of disease in an individual. In populations where the majority of individuals are caries free, the mean dmfs/t will appear to be low, thus distracting from the seriousness of those with caries. Skewed caries distributions are not described adequately by an average. Furthermore, the index does not differentiate between caries patterns that could suggest different etiologies and consequently different preventive measures. Furthermore, it is not related to the number of teeth at risk. Birch claimed that the dmf index is a measure of cumulative prevalence of dental disease; it does not indicate the severity of dental disease. Progress in understanding the etiology, epidemiology, and management of any disease depends on the continuous development of valid and reliable tools that can accurately diagnose the severity of a disease or condition. This important concept has to be applied in the science of cariology so as to develop a reliable tool that could improve knowledge and awareness regarding understanding of the disease process. Grainger was the first to suggest a hierarchical system of caries patterns to describe the severity of caries for the permanent dentition, which was later modified by Poulsen and Horowitz. The adoption of a caries measure in addition to the dmf index which could compensate for the shortcomings of the index could prove useful both in epidemiological survey programs and clinical dental health-care program. Because of its simplicity and added dimension to the dmf index, it was termed valuable for use in primary dentition so as to assess the pattern and severity of dental caries in children. Hence, the aim of the present study was to analyze caries data from 3–6–year-old children according to the hierarchical caries pattern system and to evaluate the usefulness of this system as an additional caries descriptor for this population
| Methodology|| |
The present study was done to assess the pattern of dental caries in 3–6-year-old children. Children with systemic disorders and special children were excluded from the study. Institutional ethical clearance was obtained. Signed written informed consent was obtained from the parents/guardian of the children participating in the study.
Data were collected from 3–6-year-old children, who visited the Department of Pediatric and Preventive Dentistry, Vokkaligara Sangha Dental College and Hospital, Bangalore and Indira Gandhi Institute of Child Health, Bangalore. Dmfs in the primary dentition was recorded according to the criteria recommended by the World Health Organization, 2013. All the children were examined under standardized conditions by a single qualified examiner. Caries examination was done using plain mouth mirror, community periodontal index probe, under optimal light source. Each surface was scored independently. Erupted permanent teeth were excluded from this analysis. No radiographic examination was done.
On the basis of the caries recordings, the dmfs score of each child was calculated and each child was assigned to one of the six zones of increasing caries severity, ranging from 0 (caries free) to 5 (most severe) [Table 1]. This hierarchical system works on an assumption of cumulative zone membership, i.e., it assumes that once a child is classified into a given severity zone, it will automatically belong to all zones of lesser severity (excluding severity zone 0). Thus, the zones in the system are mutually exclusive.
|Table 1: Poulsen and Horowitz criteria to classify individuals according to severity of dental caries|
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| Results|| |
The present study was done to determine the pattern of dental caries in 3–6-year-old children.
Chi-square test was used to compare the study population according to age and gender. Student's t-test was used to compare the data between two groups, i.e., males and females. ANOVA “F” value was used to compare the data between different age groups. Pearson correlation coefficient was used to depict the correlation between dmfs and severity zone score (SZS).
The sample size for the study was 500. Out of 500 study individuals, 229 (45.8%) were female and 271 (54.2%) males. Age distribution of the study population was 3–6 years [Table 2].
|Table 2: Depicting demographic distribution of study individuals according to age and gender|
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The overall mean dmfs for the study population was 9.10. The mean dmfs for the males was found to be 9.88, whereas for females, it was 7.11. There was statistically significant difference in the mean dmfs according to gender (P = 0.009) [Table 3].
|Table 3: Depicting mean decayed, missing, filled surface score according to gender and age|
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When compared among different age group, a considerable caries experience was evident at age 3. The dmfs score increased until age 5 and then stabilized. There was no statistically significant difference in the mean dmfs according to age (P = 0.216) [Table 3] and [Figure 1].
|Figure 1: Mean decayed, missing, filled surface among various age groups|
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Mean decayed component was found to be higher in males (P = 8.53) as compared to that of females (P = 7.11). There was statistically significant difference in the mean decayed component among males and females (P = 0.017). Among age groups 3, 4, 5, and 6, no statistically significant difference was found in the mean d component score (P = 0.214) [Table 4].
|Table 4: Depicting mean decayed component score according to gender and age|
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On assessment of mean missing and filled component, there was no statistically significant difference in-between males and females (P = 0.276) and between different age groups 3, 4, 5, and 6 (P = 0.224).
Pearson correlation indicates that there is positive correlation between dmfs and SZS score (0.691) [Table 5].
|Table 5: Depicting the correlation of decayed, missing, filled surface and severity zone score|
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As the dmfs score increases, the SZS score also increases which indicates that there is a strong positive correlation between SZS and dmfs [Figure 2].
|Figure 2: Scatter plot showing correlation of severity zone score and decayed, missing, filled surface. Inference of the above scatter plot: As the decayed, missing, filled surface score increases, the severity zone score also increases, which indicates that there is a strong positive correlation between severity zone score and decayed, missing, filled surface|
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Mean dmfs score for those children who were assigned to severity zone 0 was 0.11 rather than 0. This discrepancy was due to the fact that, according to the criteria, the buccal and lingual surfaces of posterior teeth and the lingual surfaces of the anterior teeth were excluded when assigning severity zones.
Depiction of the individual SZS score among males and females revealed that out of 500 study individuals, a total of 89 individuals (48 males and 41 females) fell under severity zone 0. Seventy-three individuals (36 males and 37 females) fell under severity zone 1. One hundred and sixty-seven individuals (86 males and 81 females) fell under severity zone 2. Sixty-one individuals (34 males and 27 females) fell under severity zone 3. Ninety-two individuals (53 males and 40 females) fell under severity zone 4 and 18 individuals (14 males and 4 females) fell under severity zone 5 [Figure 3].
|Figure 3: Depicting the individual severity zone score among males and females|
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| Discussion|| |
The foundation of adult oral health is already laid during the formative preschool years, during which a child's dental caries pattern and caries risk are established. Studies have shown that although the dental decay experience of children, as measured by the dmft index, has improved in most industrialized countries over the past 10 years, improvements in the dmft index of 5-year-old children are no longer seen, and the dental health of this age group may be worsening. The adoption of a caries tool in addition to dmf index to compensate for some of the shortcomings of dmf index could be useful, both in an epidemiological survey purpose as well as clinical examination. Because of its simplicity and added dimension to the dmfs index, Poulsen and Horowitz criteria (1997) could prove to be valuable for use on child population. These criteria were used in a study conducted by Wong et al. to determine the severity and pattern of dental caries in Chinese kindergarten children. The present study explored the pattern of dental caries in 3–6-year-old children and evaluated the usefulness of this hierarchical caries pattern system as an additional caries descriptor along with dmfs.
The children included in this study presented with a low level of restorative dental care (only few fillings and/or extractions). This makes them particularly suitable for the study of caries patterns since the distribution of the lesions was not modified by treatment decisions of the dentist.
The overall mean dmfs for the study population was 9.10. Although an average dmfs value of 9.10 for the study population indicates a serious oral health problem, the dmfs itself does not in fact help us to understand the nature of the caries process. The distribution of children according to the severity zones of Poulsen and Horowitz indicates a very low percentage (17.8%) of caries-free children and also a high percentage of children with caries in severity zone 2 (33.4%) which makes proximal surfaces of posterior teeth (including distal surfaces of cuspids) and severity zone 4 (18.6%) which makes labial surfaces of maxillary and mandibular anterior teeth (except those of maxillary cuspids). Thus, a valuable addition to the dmfs information is achieved which points both to a possible etiologic factor and to possible preventive measures that could be undertaken.
It was observed that mean dmfs score for those children who were assigned to severity zone 0 was 0.11 rather than 0. This finding was consistent with previous study done by Wong et al., in which the mean dmfs score for the children assigned to severity zone 0 was 0.3 rather than 0. This discrepancy was due to the fact that, according to the criteria, the buccal and lingual surfaces of posterior teeth and the lingual surfaces of the anterior teeth were excluded when assigning severity zones. However, while recording dmfs, caries was naturally counted on all the surfaces of the teeth.
It was observed in the present study that there is positive correlation between dmfs and SZS. As the dmfs score increases, the SZS also increases. This was consistent with the study conducted by Wong et al., wherein a strong positive correlation was found between dmfs and the SZS.
Out of 500 children examined, occlusal surface of posterior teeth was affected in 74.1% children, and in 56.6% of children, proximal as well as occlusal surfaces of the posterior teeth were affected. Proximal surface of maxillary anterior teeth was affected in 31.6% of children.
In the present study, anterior teeth were less often affected by caries as compared to the posterior teeth, and the lowest prevalence of dental caries was observed in the mandibular anterior teeth. This was in accordance to a study conducted by Gizani et al. in which the posterior teeth were most prone to caries attack and the least being mandibular anterior teeth. In their study, buccal and lingual surfaces of all the teeth were examined for the presence of carious lesion. Whereas, the present study failed to examine the buccal and lingual surfaces of the posterior teeth and the lingual surfaces of the maxillary and the mandibular teeth while assigning the severity zone. As it is observed that these surfaces are also often affected by caries, important information is being missed by not examining those surfaces.
The hierarchical severity zone system as originally proposed must be subjected to minor modifications to improve the fulfillment of basic assumptions underlying the method.
| Conclusion|| |
The Poulsen and Horowitz model gives broader aspect for the assessment of severity of dental caries in 3–6-year-old children. By routinely using dmfs and hierarchical system together, a more complete picture of the caries status of the population could be provided. It could also help differentiate between different caries patterns that could suggest different etiologies and consequently different preventive approaches, which would ultimately help in preventing the progression of the disease process.
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Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5]