Caries risk assessment in young adults: A 3-year validation of clinical guidelines used in Public Dental Service

Prediction of Future Caries in 1-Year-Old Children via the Salivary Microbiome

Dental caries is the most common chronic disease in children that causes negative effects on their health, development, and well-being. Early preventive interventions are key to reduce early childhood caries prevalence. An efficient strategy is to provide risk-based targeted prevention; however, this requires an accurate caries risk predictor, which is still lacking for infants before caries onset. We aimed to develop a caries prediction model based on the salivary microbiome of caries-free 1-y-old children. Using a nested case-control design within a prospective cohort study, we selected 30 children based on their caries status at 1-y follow-up (at 2 y old): 10 children who remained caries-free, 10 who developed noncavitated caries, and 10 who developed cavitated caries. Saliva samples collected at baseline before caries onset were analyzed through 16S rRNA gene sequencing. The results of β diversity analysis showed a significant difference in salivary microbiome composition between children who remained caries-free and those who developed cavitated caries at 2 y old (analysis of similarities, Benjamini-Hochberg corrected, P = 0.042). The relative abundance of Prevotella nanceiensis, Leptotrichia sp. HMT 215, Prevotella melaninogenica, and Campylobacter concisus in children who remained caries-free was significantly higher than in children who developed cavitated caries (Wilcoxon rank sum test, P = 0.024, 0.040, 0.049, and 0.049, respectively). These taxa were also identified as biomarkers for children who remained caries-free (linear discriminant analysis effect size, linear discriminant analysis score = 3.69, 3.74, 3.53, and 3.46). A machine learning model based on these 4 species distinguished between 1-y-old children who did and did not develop cavitated caries at 2 y old, with an accuracy of 80%, sensitivity of 80%, and specificity of 80% (area under the curve, 0.8; 95% CI, 44.4 to 97.5). Our findings suggest that these salivary microbial biomarkers could assist in predicting future caries in caries-free 1-y-old children and, upon validation, are promising for development into an adjunctive tool for caries risk prediction for prevention and monitoring.

Dentists´ and Dental Hygienists´ experiences of the Capitation Contract System-the dilemma of conflicting loyalties

OBJECTIVE

The Capitation Contract system (CCS) is a payment model adopted by the Swedish Public Dental Health Service (PDHS). Patients enrolled in the CCS are usually assessed as being at lower risk of dental disease and are more regular dental attenders than those treated by Fee for Service (FFS). With increasing numbers of patients and CCS enrolments, Sweden faces a shortage of dental personnel. Our aim was to analyse dentists´ and dental hygienists´ perceptions and experiences of the capitation contact system.

MATERIAL AND METHODS

Eleven dentists and dental hygienists from three Swedish regions participated in online qualitative interviews conducted according to the Grounded Theory methodology.

RESULTS

When working with CCS the informants tried hard ´to find a balance between attitudes, compliance with guidelines and clinical resources´. Not all patients were offered CCS, even though they qualified: among other determinants were the informants' interpretations of guidelines and regulations, clinical resources, and patient interest.

CONCLUSIONS

When dental resources are in balance, the informants appreciate the CCS and consider it to be favourable to patient health but are aware of conflicting loyalties of their dual roles of insurance sales agent and care provider. The informants´ individual mindset affects which patients are offered CCS enrolment.

Assessment of predictive performance of caries risk assessment models based on a systematic review and meta-analysis

OBJECTIVES

To assess the predictive performance of caries risk assessment (CRA) models for prediction of caries increment for individuals based on a systematic review and meta-analyses.

DATA/SOURCES

We included external validation studies assessing the predictive performance of CRA models for prediction of caries increment for individuals, using discrimination and calibration as the outcome parameters. PubMed, EMBASE, and CINAHL were searched electronically on 10th September 2020 to identify prediction modeling studies on external validation of CRA models. The risk of bias of the included studies was assessed using the Prediction model Risk Of Bias ASsessment Tool (PROBAST).

STUDY SELECTION

A total of 22 studies with seven different CRA models were included. As for full Cariogram, the pooled area under the receiver operating characteristic curve (AUC) was 0.78 (95 %CI: 0.68; 0.85) based on eight studies regardless of the risk of bias levels, and 0.82 (95 %CI: 0.58; 0.93) based on four studies with low risk of bias only. The pooled observed: expected ratio (O:E ratio) of full Cariogram was 0.91 (95 %CI: 0.72; 1.14) based on 12 studies regardless of the risk of bias levels, and 0.89 (95 %CI: 0.71; 1.12) based on five studies with low risk of bias only. As for reduced Cariogram, the pooled AUC was 0.72 (95 %CI: 0.67; 0.77) based on six studies regardless of the risk of bias levels, and 0.74 (95 %CI: 0.45; 0.91) based on two studies with low risk of bias only. The pooled O:E ratio of reduced Cariogram was 0.84 (95 %CI: 0.59; 1.18) based on six studies regardless of the risk of bias levels, and 1.05 (95 %CI: 0.43; 2.59) based on two studies with low risk of bias only. Based on an insufficient number of studies for the other CRA models, the pooled AUCs ranged from 0.50 to 0.88, while the pooled O:E ratio ranged from 0.38 to 1.00.

CONCLUSION

The average predictive performance of both full and reduced Cariogram seems to be acceptable. However, the evidence from research does not allow a firm conclusion on the performance of the other included CRA models, due to the insufficient number of high-quality studies.

CLINICAL SIGNIFICANCE

Both full and reduced Cariogram were found to be reliable CRA models for prediction of caries increment in clinical practices for dental patients and communities for general populations. The reduced Cariogram showed better predictive performance and less burden in terms of time and resources to individuals than the full Cariogram. Therefore, the reduced Cariogram could be more recommended than the full Cariogram.

Caries incidence and risk assessment during a five-year period in adolescents living in south-eastern Sweden

OBJECTIVES

The aim was to examine the caries incidence in adolescents using the Public Dental Service (PDS) during a 5-year period in relation to their caries experience at baseline and risk classification.

METHODS

A 5-year retrospective cohort study based of the dental records from 17 PDS clinics in south-eastern Sweden was conducted; 159 individuals born in 1997 were included, and their caries risk was classified at 12 and 17 years of age. Caries prevalence and documented risk groups were assessed at baseline and after 5 years.

RESULTS

The increment of caries (both initial and manifest caries) was higher, to a statistically significant degree, after 5 years in adolescents who were recorded as caries-free at baseline compared to individuals with caries at baseline (P < .001). In individuals with caries at baseline, the greatest increment of caries was found at approximal sites (P < .001). At baseline, individuals were classified as low (94%), medium (6%) and high risk (0%). After 5 years, the figures were 74%, 20% and 6%, respectively. Although classified in a low-caries risk group, 9% had ≥6 decayed or filled surfaces at baseline, and 23% did after 5 years. Approximately 62% of individuals were registered as caries-free at baseline, and 45% were after 5 years.

CONCLUSIONS

There was an increase in caries over 5 years, especially among adolescents without caries experience at baseline. The majority of adolescents had the same risk classification after 5 years. Further research with a larger sample size is needed to evaluate risk assessment for caries.

Are standardized caries risk assessment models effective in assessing actual caries status and future caries increment? A systematic review

BACKGROUND

Assessing caries risk is an essential element in the planning of preventive and therapeutic strategies. Different caries risk assessment (CRA) models have been proposed for the identification of individuals running a risk of future caries. This systematic review was designed to evaluate whether standardized caries risk assessment (CRA) models are able to evaluate the risk according to the actual caries status and/or the future caries increment.

METHODS

Randomized clinical trials, cross-sectional studies, cohort studies, comparative studies, validation studies and evaluation studies, reporting caries risk assessment using standardized models (Cariogram, CAMBRA, PreViser, NUS-CRA and CAT) in patients of any age related to caries data recorded by DMFT/S or ICDAS indices, were included. PubMed, Scopus and Embase were searched from 2000 to 2016. A search string was developed. All the papers meeting the inclusion criteria were subjected to a quality assessment.

RESULTS

One thousand three-undred ninety-two papers were identified and 32 were included. In all but one, the Cariogram was used both as sole model or in conjunction with other models. All the papers on children (n = 16) and adults (n = 12) found a statistically significant association between the risk levels and the actual caries status and/or the future caries increment. Nineteen papers, all using the Cariogram except one, were classified as being of good quality. Three of four papers comprising children and adults found a positive association. For seven of the included papers, Cariogram sensibility and specificity were calculated; sensibility ranged from low (41.0) to fairly low (75.0), while specificity was higher, ranging from 65.8 to 88.0. Wide 95% confidence intervals for both parameters were found, indicating that the reliability of the model differed in different caries risk levels.

CONCLUSIONS

The scientific evidence relating to standardized CRA models is still limited; even if Cariogram was tested in children and adults in few studies of good quality, no sufficient evidence is available to affirm the method is effective in caries assessment and prediction. New options of diagnosis, prognosis and therapy are now available to dentists but the validity of standardized CRA models still remains limited.

Guidelines on the timing and frequency of bitewing radiography: a systematic review

Objectives To identify guidelines on when and how frequently bitewing radiographs should be used in dentistry for the diagnosis of caries, and to provide an objective appraisal of their quality.Data sources MEDLINE (OVID), US National Guideline Clearinghouse (www.guideline.gov) and the Royal College of Surgeons of England (https://www.rcseng.ac.uk/fds/publications-clinical-guidelines/clinical_guidelines) websites were searched using a variety of relevant search terms (2 August 2016).Data selection Publications were included if they made recommendations on the issue of when and how frequently radiographs should be used in any dentally-related specialty pertaining to the diagnosis of caries; and/or if they were aimed at the individual practitioner (any health professional working within dentistry) and/or patients.Data analysis Thirteen published guidelines were included and assessed using the AGREE II instrument.Conclusions There was a significant variation amongst the guidelines in the recommendations at what age radiography should be undertaken. There was also disagreement on the frequency of repeat radiographs and how this is influenced by the age of the patient and their caries risk.

Relationship between risk assessment and payment models in Swedish Public Dental Service: a prospective study

Background

To a) compare risk categories in patients selecting a capitation payment (CP) model with those in fee-for-service (FFS), b) determine the 3-year caries increment in the two groups, and c) compare the amount of delivered preventive care in the two groups.

Methods

A comprehensive risk assessment was carried out in 1295 young adults attending eight Public Dental Clinics in the Scania region and 75% could be re-examined after 3 years; 615 had selected the CP model and 310 the traditional FFS. Caries was scored according to WHO and data concerning preventive care was extracted from the dental records.

Results

More patients in the low risk category preferred the CP model (74% vs. 26%) while >80% with high risk selected FFS. The baseline caries level was significantly higher in the FFS group as well as the 3-year caries increment (1.6 vs. 0.8 DFS: p < 0.05). The amount of additional preventive care delivered to each patient was generally lower in the FFS model; it was most frequent among patients with “some” risk in the CP model (83.8%) while the lowest delivery rates were found among low risk patients in the FFS system (32.4%).

Conclusions

Young adults in public dental care with low risk preferred the prepaid model while those in the higher risk categories selected fee-for-service. As more additional preventive care was delivered to patients in the subscribed care, oral health planners and decision makers should be aware of the fact that capitation payment models may enhance inequalities in dental health over time.

Comparison of risk assessment based on clinical judgement and Cariogram in addition to patient perceived treatment need

Background

Predicting future risk for oral diseases, treatment need and prognosis are tasks performed daily in clinical practice. A large variety of methods have been reported, ranging from clinical judgement or “gut feeling” or even patient interviewing, to complex assessments of combinations of known risk factors. In clinical practice, there is an ongoing continuous search for less complicated and more valid tools for risk assessment. There is also a lack of knowledge how different common methods relates to one another. The aim of this study was to investigate if caries risk assessment (CRA) based on clinical judgement and the Cariogram model give similar results. In addition, to assess which factors from clinical status and history agree best with the CRA based on clinical judgement and how the patient’s own perception of future oral treatment need correspond with the sum of examiners risk score.

Methods

Clinical examinations were performed on randomly selected individuals 20–89 years old living in Skåne, Sweden. In total, 451 individuals were examined, 51 % women. The clinical examination included caries detection, saliva samples and radiographic examination together with history and a questionnaire. The examiners made a risk classification and the authors made a second risk calculation according to the Cariogram.

Results

For those assessed as low risk using the Cariogram 69 % also were assessed as low risk based on clinical judgement. For the other risk groups the agreement was lower. Clinical variables that significantly related to CRA based on clinical judgement were DS (decayed surfaces) and combining DS and incipient lesions, DMFT (decayed, missed, filled teeth), plaque amount, history and soft drink intake. Patients’ perception of future oral treatment need correlated to some extent with the sum of examiners risk score.

Conclusions

The main finding was that CRA based on clinical judgement and the Cariogram model gave similar results for the groups that were predicted at low level of future disease, but not so well for the other groups. CRA based on clinical judgement agreed best with the number of DS plus incipient lesions.

Preventive care delivered within Public Dental Service after caries risk assessment of young adults

OBJECTIVES

To study preventive care provided to young adults in relation to their estimated risk category over a 3-year period.

METHODS

The amount and type of preventive treatment during 3 years was extracted from the digital dental records of 982 patients attending eight public dental clinics. The baseline caries risk assessment was carried out by the patient's regular team in four classes according to a predetermined model, and the team was responsible for all treatment decisions. Based on the variables 'oral health information', 'additional fluoride' and 'professional tooth cleaning', a cumulative score was constructed and dichotomized to 'basic prevention' and 'additional prevention'.

RESULTS

More additional preventive care was provided to the patients in the 'low-risk' and 'some risk' categories than to those classified as 'high' or 'very high' risk (OR = 2.0, 95% CI 1.4-3.0; P < 0.05). Professional tooth cleaning and additional fluorides were most frequently employed in the 'low-risk' and 'some risk' categories, respectively. Around 15% of the patients in the high-risk categories did not receive additional preventive measures over the 3-year period. There was an insignificant tendency that patients with additional prevention developed less caries than those that received basic prevention in all risk categories except for the 'very high-risk' group.

CONCLUSION

The caries risk assessment process was not accompanied by a corresponding targeted individual preventive care in a cohort of young adults attending public dental service. Further research is needed how to reach those with the greatest need of primary and secondary prevention.

Caries risk assessment in young adults: a 3 year validation of the Cariogram model

Background

To validate baseline caries risk classifications according to the Cariogram model with the actual caries development over a 3-year period in a group of young adults living in Sweden.

Methods

The study group consisted of 1,295 19-year-old patients that completed a comprehensive clinical baseline examination, including radiographs and salivary tests. An individual caries risk profile was computed and the patient was placed in one of five risk categories. After 3 years, 982 patients (75.8%) were re-examined and caries increment for each patient was calculated. The outcome was expressed as sensitivity, specificity and predictive values and compared with a risk assessment scheme used in Public Dental Service.

Results

The drop-outs displayed more risk factors and a significantly higher caries burden at baseline compared with those that remained in the project (p < 0.05). There was a strong association between the Cariogram risk categories and the 3-year caries increment on cavity level but the predictive values were modest. The high or very high caries risk categories yielded high specificities (>90%) but poor sensitivities. The low risk groups displayed higher sensitivities on expense of impaired specificities. No combinations proved clinically useful values according to Yuoden’s index.

Conclusions

Within the limitations of the present study, the computer-based Cariogram did not perform better than a caries risk assessment scheme based on past caries experience and caries progression, over a 3-year period in young adults.

A retrospective analysis of caries treatment and development in relation to assessed caries risk in an adult population in Sweden

Background

The Public Dental Service of Västerbotten County (Sweden) recommends using population-based prevention strategies combined with an individual strategy for high-risk patients to manage caries. To facilitate this management strategy, all patients are evaluated for their risk of developing caries in the coming year using defined criteria. Using caries risk scoring over a seven-year period, the present study evaluates prophylactic measures, caries development, and non-operative treatments in adult patients.

Methods

From all adult patients (25–65 years; n = 76 320) scored with a high caries risk in 2005 (baseline) and with a dental visit in 2011, 200 subjects were randomly selected. In addition, an equally sized control group with a no/low caries risk was selected. Information concerning dental status, counselling, treatments, visits, and costs were retrieved from dental records.

Results

Over the seven-year study period, subjects with high caries risk had significantly higher caries incidence in spite of shorter recall intervals, more dental appointments, and higher costs for dental care than subjects with no/low caries risk. Non-operative measures, such as additional fluoride and individual counselling on diet at baseline (2005), was higher in the high caries risk group, whereas information about basic prophylaxis and counselling on oral hygiene showed only small differences. The frequency of non-operative measures given during the seven-year study period to patients in the high caries risk group is considered to be remarkably low and improvement, determined as reclassification from high to no/low caries risk from 2005 to 2011, was seen in only 13% of the participants.

Conclusions

This study formulated two major conclusions. First, adult patients with high or no/low caries represent different populations, that each contain distinct subpopulations, those who improve/impair or maintained their caries risk and disease progression. These groups need different strategies in disease treatment. Second, preventive measures and non-operative treatments were associated with improvements in caries risk and maintenance, but the extent to which such treatments were given to high caries risk subjects was unacceptably low. Improved adherence to the guidelines for caries treatment may reduce caries risk, visits to dental clinics, and costs for the patients.