The effectiveness of sealants in managing caries lesions

A barrier to providing sealants is concern about inadvertently sealing over caries. This meta-analysis examined the effectiveness of sealants in preventing caries progression. We searched electronic databases for comparative studies examining caries progression in sealed permanent teeth. We used a random-effects model to estimate percentage reduction in the probability of caries progression in sealed vs. unsealed carious teeth. Six studies, including 4 randomized-controlled trials (RCT) judged to be of fair quality, were included in the analysis (384 persons, 840 teeth, and 1090 surfaces). The median annual percentage of non-cavitated lesions progressing was 2.6% for sealed and 12.6% for unsealed carious teeth. The summary prevented fraction for RCT was 71.3% (95%CI: 52.8%-82.5, no heterogeneity) up to 5 years after placement. Despite variation among studies in design and conduct, sensitivity analysis found the effect to be consistent in size and direction. Sealing non-cavitated caries in permanent teeth is effective in reducing caries progression.

Comparing the costs of three sealant delivery strategies

We analyzed the cost-effectiveness of 3 sealant delivery strategies: Seal all (SA), seal children assessed to be at risk by screening (TARGET), and seal none (SN). We assumed a nine-year analytic horizon, a 3% discount rate, and zero screening costs. Estimates for sealant costs ($27.00) and restoration costs ($73.77), annual caries increment (0.0624 surfaces), sealant failure rate (20% in yr 1 and 3% thereafter), annual amalgam failure rate (4.6%), and sensitivity (0.635) and specificity (0.795) of screening were obtained from published studies. Under baseline assumptions, TARGET dominated (cost less and reduced caries) SA and SN. If annual caries increment exceeded 0.095 surfaces, SA dominated TARGET, and if increment exceeded 0.05 surfaces, TARGET dominated SN. If sealant costs decreased to $6.00 (reported cost for school programs), TARGET dominated SN for caries increments exceeding 0.007 surfaces, and SA dominated TARGET for caries increments exceeding 0.034 surfaces.

Quantifying the diffused benefit from water fluoridation in the United States

OBJECTIVE

To estimate the total contribution of water fluoridation to caries reduction by including the benefit from the diffusion of fluoride from fluoridated communities to surrounding nonfluoridated communities via the export of bottled beverages and processed foods.

METHODS

We analyzed data from the 1986-87 NIDR Children's Survey for 18,507 school children aged 6-17 years who had at least one permanent tooth and for whom a complete fluoride exposure history could be created. To measure water fluoridation exposure, we generated continuous and categorical exposure variables. Years of fluoridation exposure (YFE-continuous) measured the number of years the child lived at residences receiving fluoridated water. Lifetime fluoridation exposure (LFE-categorical) was high if the child lived at residences receiving fluoridated water more than 50% of his life and low, otherwise. We summed the proportion of state population receiving fluoridated water times the number of years the child had lived in each state and then divided this value by the child's age to measure diffusion exposure (DE). We grouped DE into three levels: low (DE<=0.25), medium (0.25<DE<0.55), and high (DE>=0.55). For each level of DE, we compared the age-adjusted mean DMFS for high and low LFE. In addition we used linear regression to measure the association between DMFS and YFE while controlling for DE, age, exposures to other fluoride sources, and sociodemographic variables. Reported results are significant at P<0.05.

RESULTS

Comparison of mean DMFS scores found that the direct benefit of water fluoridation (DMFS(LFE=low) - DMFS(LFE=high)) was 1.44 surfaces among low DE children and 0 among high DE children. The diffused benefit (DMFS(LFE=low, DE=low) - DMFS(LFE=low, DE=high)) was 1.23 surfaces. The regression results were similar and indicated that the direct benefit would be 1.44 fewer DMFS for low DE children and the indirect benefit would be 1.09 fewer DMFS for high DE children.

CONCLUSION

Failure to account for the diffusion effect may result in an underestimation of the total benefit of water fluoridation, especially in high diffusion exposure regions.

Dental services, costs, and factors associated with hospitalization for Medicaid-eligible children, Louisiana 1996-97

OBJECTIVE

This study compared types and costs of dental services rendered to children who had received care in a hospital operating room (H) with children who had not (NH).

METHODS

The study population consisted of all children aged 1-5 years who received a dental service reimbursed by the Louisiana Medicaid EPSDT program from October 1996 through September 1997. Claim files were provided by the Louisiana Bureau of Health Services Financing. A treatment intensity index [TII = 3 x (# extractions) + 2 x (# pulpotomies + # crowns) + # simple restorations] was calculated for H children (n = 2, 142) and NH children (n = 38,423). Using logistic regression, a dichotomous hospitalization variable (H vs NH) was regressed against treatment intensity and selected personal and parish (county) characteristics for each of the five age groups. Total and average reimbursement per child were calculated for both groups of children, by age.

RESULTS

The mean treatment intensity scores for H and NH children were 24.02 (SD = 11.82) and 2.16 (SD = 4.78), respectively. For all age groups, children with treatment intensity scores greater than 8 were at least 132 times more likely to be hospitalized than were children with scores less than or equal to 8. The mean cost for care provided to H children was $1,508 compared with $104 for NH. Total costs for dental care rendered to H children (5% of the study population) were $3,229,851 (45% of total dental costs for the study population).

CONCLUSION

Reducing severe caries through early interventions could provide substantial cost savings.

Risk and prevention of hepatitis C virus infection. Implications for dentistry

BACKGROUND

The occupational risk of hepatitis C virus, or HCV, infection in dentistry is very low. Nonetheless, the lack of an effective vaccine, the high rates of chronic infection and the limited effectiveness of treatment may cause concern for dental workers who come into contact with blood in their daily practices.

DESCRIPTION OF THE DISORDER

The authors discuss the natural history, diagnosis and treatment, and patterns of transmission of HCV infection, including the Centers for Disease Control and Prevention's recommendations for management and follow-up of health care workers after occupational exposure to HCV.

CLINICAL IMPLICATIONS

In the absence of an effective vaccine or postexposure prophylaxis, prevention of occupational transmission of HCV in dental settings continues to rely on the use of universal precautions, including barrier precautions and the safe handling of sharp instruments.

Occupational blood exposure and HIV infection among oral and maxillofacial surgeons

OBJECTIVE

The purpose of this study was to examine occupational blood exposure and the seroprevalence of HIV infection among oral and maxillofacial surgeons.

STUDY DESIGN

Three hundred twenty-one oral and maxillofacial surgeons attending an annual meeting voluntarily and anonymously participated in an HIV serosurvey and completed a questionnaire assessing practice and demographic factors. Statistical tests included the Wilcoxon rank-sum test and the chi-squared test.

RESULTS

Eighty percent of those who completed the survey reported one or more blood-skin contacts within the previous month. The mean number of percutaneous injuries within the previous year was 2.36 +/- 0.2. Wire was most commonly associated with percutaneous injuries. Oral maxillofacial surgeons who reported three or more percutaneous injuries performed more fracture reductions than oral and maxillofacial surgeons reporting no percutaneous injuries (p < 0.01). No participant was HIV-positive; the upper limit of the 95% confidence interval was 1.15%.

CONCLUSION

The findings suggest that the occupational risk for HIV infection in oral surgery is very low even though most oral and maxillofacial surgeons experienced blood contact. Associations of percutaneous injuries with fracture reductions and wire may assist in the development of new techniques and equipment to minimize blood exposures.

Occupational blood exposures in dentistry: a decade in review

This review summarizes data from self-reported and observational studies describing the nature, frequency, and circumstances of occupational blood exposures among US dental workers between 1986 and 1995. These studies suggest that, among US dentists, percutaneous injuries have declined steadily over the 10-year period. Data also suggest that, in 1995, most dental workers (dentists, hygienists assistants, and oral surgeons) experienced approximately three injuries per year. Work practices (eg, using an instrument instead of fingers to retract tissue), safer instrumentation or design (eg, self-sheathing needles, changes in dental-unit design), and continued worker education may reduce occupational blood exposures in dentistry further.

Hepatitis B vaccination and infection among U.S. dentists, 1983-1992

The hepatitis B vaccine became commercially available in 1982. Since then, health care workers, including dentists, have been encouraged to be vaccinated. This study examines the prevalence of hepatitis B vaccination and infection among U.S. dentists from 1983 to 1992.

Percutaneous exposures to HIV-infected blood. Among dental workers enrolled in the CDC Needlestick Study

The authors found that 19 percutaneous exposures among dental workers occurred both during and after use of instruments such as syringe needles and scalers. Specific information about the device and action associated with an exposure is important for prevention efforts, including safer instruments and work practices. Most of these exposures probably involved smaller, rather than larger, amounts of blood infected with the human immunodeficiency virus. To our knowledge, none of the exposures resulted in HIV transmission to an enrolled dental worker.

Percutaneous injuries in dentistry: an observational study

The authors conducted an observational study of the frequency and circumstances of percutaneous injuries among dental residents. Their findings suggest that most percutaneous injuries sustained by these dental residents occurred extraorally and were associated with denture impression procedures. Some injuries may be preventable with changes in techniques or instrument design.

TB infection control recommendations from the CDC, 1994: considerations for dentistry. United States Centers for Disease Control and Prevention

Between 1989 and 1992, reports of outbreaks and transmissions of tuberculosis in institutional settings prompted the Centers for Disease Control and Prevention to review the guidelines for TB infection control it had published in 1990. The CDC published an updated version of the guidelines in October 1994. This article gives dentists an overview of the guidelines' recommendations that are applicable to most outpatient dental settings.

Investigations of patients of health care workers infected with HIV. The Centers for Disease Control and Prevention database

OBJECTIVE

To assess the risk for transmission of the human immunodeficiency virus (HIV) from an infected health care worker to patients.

DESIGN

Survey of investigators from health departments, hospitals, and other agencies who had elected to notify patients who had received care from health care workers infected with HIV.

MEASUREMENTS

Information was collected about infected health care workers, their work practices, their patients' HIV test results, procedures that they did on those of their patients who were tested for HIV, and patient notification procedures.

RESULTS

As of 1 January 1995, information about investigations of 64 health care workers infected with HIV was reported to the Centers for Disease Control and Prevention; HIV test results were available for approximately 22,171 patients of 51 of the 64 health care workers. For 37 of the 51 workers, no seropositive patients were reported among 13,063 patients tested for HIV. For the remaining 14 health care workers, 113 seropositive patients were reported among 9108 patients. Epidemiologic and laboratory follow-up did not show any health care worker to have been a source of HIV for any of the patients tested.

CONCLUSION

Despite limitations, these data are consistent with previous assessments that state that the risk for transmission of HIV from a health care worker to a patient is very small. These data also support current recommendations that state that retrospective patient notification need not be done routinely.

Multidrug-resistant Mycobacterium tuberculosis in an HIV dental clinic

OBJECTIVE

To investigate possible transmission of multidrug-resistant tuberculosis (MDR-TB) in a dental setting.

DESIGN

A retrospective, descriptive study of dental workers (DWs), patients, and practice characteristics.

PATIENTS

Two dental workers (DW1 and DW2) with acquired immunodeficiency syndrome and MDR-TB.

SETTING

A hospital-based (Hospital X) human immunodeficiency virus (HIV) dental clinic in New York City.

METHODS

To identify dental patients with tuberculosis (TB), patients treated in the dental clinic at Hospital X during 1990 were cross-matched with those listed in the New York City Department of Health Tuberculosis Registry. Mycobacterium tuberculosis isolates from both DWs and from dental patients with TB were tested for antimicrobial susceptibility and typed by restriction fragment length polymorphism (RFLP) analysis. Infection control practices were reviewed.

RESULTS

M tuberculosis isolates infecting DW1 and DW2 were resistant to isoniazid and rifampin and had identical RFLP patterns. DW1 and DW2 worked in close proximity to each other in a small HIV dental clinic in Hospital X during 1990. Of 472 patients treated in the dental clinic in 1990, 41 (8.7%) had culture-proven M tuberculosis infection. Of these 41, 5 had isolates with resistance patterns similar to both DWs; however, for four available isolates, the RFLP patterns were different from the patterns of the DWs. Sixteen of the 41 patients received dental treatment while potentially infectious. Dental patients were not routinely questioned about TB by dental staff, nor were all dental staff screened routinely for TB. No supplemental environmental measures for TB were employed in the dental clinic in 1990.

CONCLUSIONS

Our investigation suggests that MDR-TB transmission may have occurred between two DWs in an HIV dental clinic. Opportunities for transmission of TB among dental staff and patients were identified. TB surveillance programs for DWs and appropriate infection control strategies, including worker education, are needed to monitor and minimize exposure to TB in dental settings providing care to patients at risk for TB.

Practical infection control in oral health surveys and screenings

Examinations for oral health surveys and screenings are performed by dentists or dental hygienists in a variety of settings. To date, CDC has made no recommendations for infection control specifically for these brief examinations. General principles for infection control can be applied during oral health surveys and screenings.

Associations of self-reported dental health and general health measures in the Rand Health Insurance Experiment

Data from the Rand Health Insurance Experiment (HIE) are used in exploratory analyses to examine the associations of self-reported dental health with general health measures. Responses of 1658 dentulous participants 18-61 yr of age are examined. Patterns of association among and between items of the physical, mental, social, and general health indices and a three-item measure of self-reported dental health are tested using principal component analyses. Findings suggest that dental health represents a separate dimension of health that is not fully accounted for by other health measures. However, while dental health may be considered an independent health construct, the dental health index was weakly but statistically significantly associated with the general health perceptions index and, to a lesser extent, to the mental health index and the two physical health indices. Improved self-reported measures of dental health status, studied in association with other general health measures, will allow us to better define oral health, and patients' perceptions of oral health, particularly in relation to other general health perceptions. In addition, a valid and reliable multidimensional oral health measure would be valuable as a potential cost-effective method of epidemiologic data collection, as well as a tool for evaluating the effectiveness of oral health interventions, and for providing data for dental health policy making and planning.

Correlates of self-reported dental health status upon enrollment in the Rand Health Insurance Experiment

This study explored the personal impact of dental problems in terms of pain, worry, and conversation avoidance, and factors associated with this impact. A self-reported dental health index, comprising three questions asked of participants in the Rand Health Insurance Experiment, was examined. Index reliability was 0.69. One-way analysis of variance and Pearson's product-moment correlations were used to explore the bivariate associations between the index and sociodemographic variables, provider-assessed clinical indicators, and the respondent's report of a toothache. Perceived dental health of the study sample (N = 1,658) was notably lower in the presence of a toothache, increasing numbers of decayed teeth, and worsening periodontal health. Weaker, but statistically significant, associations were observed for sociodemographic factors. Nonwhites and those persons with lower educational and income levels reported more impact. In regression analysis, standardized coefficients indicated that the respondent's report of a toothache and, secondarily, numbers of decayed teeth were the most important explanatory factors. These findings suggest that in the future improved self-reported measures, in addition to clinical indicators, may be an acceptable and cost-effective method of epidemiological data collection and dental health outcome assessment.

The Minnesota dental practice analysis system

The Minnesota Dental Practice Analysis System (DPAS) is a three-year project sponsored cooperatively by the University of Minnesota's School of Dentistry, Health Services Research Center, and the Minnesota Dental Association. The primary intent of the DPAS is to generate timely, reliable information on dental practice conditions for dental work force planning efforts. The system semiannually collects data from a representative sample of Minnesota dentists to monitor trends in such important areas as practice productivity, auxiliary utilization, types of procedures performed, payment mechanisms, and dental fees. Preliminary results of the project indicate that, in comparison with 1980 indicators, overall practice conditions among established Minnesota dentists have declined.