Economic impact of regulating the use of amalgam restorations.

OBJECTIVE: This article estimates the financial impact of a ban on amalgam restorations for selected population groups: the entire population, children, and children and women of childbearing age. METHODS: Using claim and enrollment data from Delta Dental of Michigan, Ohio, and Indiana and the American Dental Association Survey of Dental Services Rendered, we estimated the per capita use and annual rate of change in amalgam restorations for each age, gender, and socioeconomic subgroup. We used population projections to obtain national estimates of amalgam use, and the dental component of the Consumer Price Index to estimate the annual rate of change in fees. We then calculated the number of dental amalgams affected by the regulation, and the fees for each of the years 2005 to 2020. RESULTS: If amalgam restorations are banned for the entire population, the average price of restorations before 2005 and after the ban would increase $52 from $278 to $330, and total expenditures for restorations would increase from $46.2 billion to $49.7 billion. As the price of restorations increases, there would be 15,444,021 fewer restorations inserted per year. The estimated first-year impact of banning dental amalgams in the entire population is an increase in expenditures of $8.2 billion. CONCLUSIONS: An amalgam ban would have a substantial short- and long-term impact on increasing expenditures for dental care, decreasing utilization, and increasing untreated disease. Based on the available evidence, we believe that state legislatures should seriously consider these effects when contemplating possible restrictions on the use of amalgam restorations.

The Impact of Improved Oral Health on the Utilization of Dental Services.

Since the mid-20th century, there has been a remarkable decline in dental caries in the United States. The effects of that caries decline have now been demonstrated well into the adult population. These improvements in oral health are resulting in substantial declines in the reparative and restorative dental services being provided to the affected individuals, who comprise a growing part of the population. Because of fewer compromised teeth, extractions and their sequelae also are declining. Much of the recall and periodontal maintenance care can be provided by allied dental personnel. As the older age cohorts, who were children before the caries decline occurred, become an ever-smaller part of the population, the number of patients an individual dentist can treat in a year is likely to increase. This article was written as part of the project "Advancing Dental Education in the 21st Century."

Estimating the Number of Dentists Needed in 2040.

Numerous factors that underlie the need for dentists are undergoing significant changes. Three factors are especially important: 1) improvements in oral health; 2) lower expenditures per patient per year, giving dentists the incentive to treat more patients to maintain incomes that justify their investment in dental education and practice; and 3) dental schools' producing new dentists at a faster rate than the growth in the population. If these trends continue, there is likely to be a dentist surplus of between 32% and 110% by 2040. A major challenge for dental schools is to adjust the production of dentists before 2040 and not wait for market forces to reduce the surplus. Whether there will be a painful market-based solution to the problem, as there was in the 1980s, or whether a more orderly path can be found is one of the key challenges of the project "Advancing Dental Education in the 21st Century," for which this article was written.

Oral contraceptives and periodontal diseases: rethinking the association based upon analysis of National Health and Nutrition Examination Survey data.

BACKGROUND: Historic evidence suggests that use of high-dose combined oral contraceptives (OCs) (containing >50 microg of estrogen and>or=1mg progestin) places women at increased risk for periodontal diseases. Since the mid-1970s, OC formulations have dramatically changed. This study investigated the association between OC use and periodontal diseases among 4,930 National Health and Nutrition Examination Survey (NHANES) I and 5,001 NHANES III premenopausal U.S. women, aged 17 to 50 years, before and after the reduction of hormone levels in OCs. METHODS: Data for this cross-sectional study came from the first (NHANES I, 1971 to 1974) and third (NHANES III, 1988 to 1994) NHANES studies. RESULTS: The prevalence of OC use in the U.S. premenopausal female population in NHANES I was 22% and in NHANES III, 20%. Using multivariable logistic regression, a protective association between current OC use and gingivitis was suggestive but not significant in both NHANES I (odds ratio [OR]=0.65; 95% con- fidence interval [CI]: 0.42 to 1.01) and NHANES III (OR=0.80; 95% CI: 0.61 to 1.02) surveys. Current OC use was also associated with a decreased risk of periodontal disease in NHANES I (OR=0.36; 95% CI: 0.13 to 0.96) and a non-significant association in NHANES III (OR=0.73; 95% CI: 0.50 to 1.07). CONCLUSION: This analysis failed to validate the theory that earlier high- or current low-dose OC use is associated with increased levels of gingivitis or periodontitis and suggests an important reexamination of the perceived association between OC use and periodontal diseases.

Using insurance claims and demographic data for surveillance of children's oral health.

OBJECTIVES: This paper examines the utility of using private insurance and Medicaid dental claims as well as demographic data for assessing the oral health of children aged 5-12 years in Genesee County, Michigan, communities. METHODS: Dental insurance claims data from Delta Plan of Michigan and Michigan Medicaid, plus demographic data from the 1990 US Census (percent poverty) and from the 1995 National Center for Educational Statistics (percent free or reduced lunch eligibility), were compared to findings from two school-based oral health surveys. These surveys were the 1995 Genesee County Oral Health Survey and the 1998-2001 Mott Children's Health Center oral health screenings. Data were analyzed using zip codes, representing communities, as the comparison unit. Statistical comparisons using correlation coefficients were used to compare the findings from the six data sets. RESULTS: Using the insurance claims and school-based data, some communities consistently demonstrated high levels of dental caries or treatment for the primary dentition. The demographic measures were significantly associated with many of the primary dentition survey measures. The demographic data were more useful in identifying communities with high levels of dental disease, particularly in the primary teeth, than the insurance claims data. CONCLUSIONS: When screening is not practical, readily available demographic data may provide valuable oral health surveillance information for identification of high-risk communities, but these data do not identify high-risk individuals. In these analyses, demographic data were more useful than dental insurance claims data for oral health surveillance purposes.

Michigan Medicaid's Healthy Kids Dental program: an assessment of the first 12 months.

BACKGROUND: In 2000, Michigan's Medicaid dental program initiated Healthy Kids Dental, or HKD, a demonstration program offering dental coverage to Medicaid-enrolled children in selected counties. The program was administered through a private dental carrier at private reimbursement levels. The authors undertook a study to determine the effect of these changes. METHODS: The authors obtained enrollment and utilization data for four groups: children covered in the first 12 months of HKD in 22 counties, children with private dental coverage in the same 22 counties in the same 12 months, Medicaid-enrolled children in the same 22 counties for 12 prior months, and Medicaid-enrolled children in 46 counties who were not included in the HKD program at any time. The authors compared access to care, dentists' participation, treatment patterns, patient travel distances and program cost. RESULTS: Under HKD, dental care utilization increased 31.4 percent overall and 39 percent among children continuously enrolled for 12 months, compared with the previous year under Medicaid. Dentists' participation increased substantially, and the distance traveled by patients for appointments was cut in half. Costs were 2.5 times higher, attributable to more children's receiving care, the mix of services shifting to more comprehensive care and payment at customary reimbursement levels. CONCLUSIONS: By increasing reimbursement levels and streamlining administration, the HKD demonstration program has shown that substantial improvements can be made to dental access for the Medicaid-enrolled population. PRACTICE IMPLICATIONS: The findings of this assessment suggest that appropriate attention to administration and payment levels can rapidly improve access for Medicaid-enrolled patients using existing dental personnel. By cooperating with state officials to design a program that addresses multiple issues, dental providers can help create a Medicaid dental program that is attractive to both providers and patients.

Radiographic detection of approximal caries: a comparison between senior dental students and senior dental hygiene students.

PURPOSE: Dental hygienists do not legally (or definitively) diagnose caries, but they often are responsible for preliminary interpretation of bitewing (BW) radiographs taken during prophylaxis appointments. Given this custom of practice, it is important to understand whether there is a difference between the capabilities of dental hygienists and dentists in interpreting BWs based on education and clinical experience. This study compared proximal carious lesion classification from BWs by senior dental students and senior dental hygiene students. METHODS AND MATERIALS: Volunteers (40 dental [D] and 54 dental hygiene [DH] students) classified proximal carious lesions from BWs of 96 extracted teeth, which were mounted in wax to simulate quadrants of the mouth. A soft tissue equivalent was placed in front of the mounted teeth before x-ray exposure. Films were developed automatically and mounted into six sets point scale. The teeth were sectioned vertically and evaluated clinically at 5x magnification with an explorer. The "gold standard" of carious lesion classification was then compared to the students' classifications. RESULTS: All students detected 54% of the carious lesions and correctly identified lack of caries 80.5% of the time. There were no differences between the two groups of students in terms of sensitivity, but dental students showed higher specificity (p = 0.0006). CONCLUSION: Permitting dental hygienists to make preliminary interpretations of caries from BWs in the dental office appears to be an acceptable practice.

Trends in dental treatment, 1992 to 2007.

BACKGROUND: Reductions in U.S. dental caries levels have been noted since the 1970s. Reports indicate that dental treatment is changing accordingly. The author examined dental insurance claims to determine whether these changes in dental treatment trends of insured people have continued. METHODS: To measure the annual per capita use of dental services, the author used Delta Dental of Michigan, Ohio, and Indiana insurance claims for care provided by dentists in Michigan. The number of patients' claims assessed ranged from 1.25 million in 1992 to 1.84 million in 2007. Within each of these years, the number of each type of service provided was divided by the number of patients receiving treatment of any type, according to birth year. RESULTS: The author found that overall, the per capita number of restorative procedures continued to decline. Resin-based composite restorations continued to be placed instead of amalgam restorations. The number of extractions (except for third-molar extractions) and endodontic procedures continued to decrease slightly. As a result, prosthodontic procedures decreased overall. The use of implants continued to increase. CONCLUSIONS: The patterns in the use of dental services by age of patients continue to change. These changes follow closely the reported changes in the oral health in the population. PRACTICE IMPLICATIONS: The number of restorative and prosthodontic services per person required by patients born more recently is not as great as in patients born earlier. Practitioners might need to adjust the number of patients they treat and the services they provide in the coming decades.

Assessing patterns of restorative and preventive care among children enrolled in Medicaid, by type of dental care provider.

BACKGROUND: The authors investigate the relationship of preventive dental treatment to subsequent receipt of comprehensive treatment among Medicaid-enrolled children. METHODS: The authors analyzed Medicaid dental claims data for 50,485 children residing in Wayne County, Mich. The study sample included children aged 5 through 12 years in 2002 who had been enrolled in Medicaid for at least one month and had had at least one dental visit each year from 2002 through 2005. The authors assessed dental care utilization and treatment patterns cross-sectionally for each year and longitudinally. RESULTS: Among the Medicaid-enrolled children in 2002, 42 percent had had one or more dental visits during the year. At least 20 percent of the children with a dental visit in 2002 were treated by providers who billed Medicaid exclusively for diagnostic and preventive (DP) services. Children treated by DP care providers were less likely to receive restorative and/or surgical services than were children who were treated by dentists who provided a comprehensive mix of dental services. The logistic model showed that children who visited a DP-care provider were about 2.5 times less likely to receive restorative or surgical treatments than were children who visited comprehensive-care providers. Older children and African-American children were less likely to receive restorative and surgical treatments from both types of providers. CONCLUSIONS: The study results show that the type of provider is a significant determinant of whether children received comprehensive restorative and surgical services. The results suggest that current policies that support preventive care-only programs may achieve increased access to preventive care for Medicaid-enrolled children in Wayne County, but they do not provide access to adequate comprehensive dental care.