Provision of treatment for periodontitis in Norway in 2013 – a national profile

Do Norwegian private dental practitioners with too few patients compensate for their loss of income by providing more services or by raising their fees?

OBJECTIVE

In Norway, supply of dental services exceeds demand, mainly because of the marked improvement in dental health during the last few decades. The aim of the study was to investigate whether private dental practitioners counteract a fall in demand for their services by providing more services or by raising their fees.

METHODS

The data were collected using a questionnaire that was sent to all private dental practitioners in Norway. Altogether 1237 practitioners responded, which gave a response rate of 56%. Our sample was representative of the population of practitioners in Norway. As a measure of patient supply, responses from the following questions were used: 'Based on an overall assessment of economy, workload and other personal factors, is the number of regular patients adequate? If not, do you wish to have more patients, or fewer patients?' The outcome variables were dental fees, length of recall interval and mean cost per visit. The data were analysed using ordinary least square regression and a linear probability model. The following characteristics of the private dental practitioners were included as control variables: age, gender, work experience in years and whether they worked in a solo practice. To test the robustness of the findings, a supplementary analysis with the patient as the unit of analysis was carried out, using survey data of Norwegians aged 20 years and older. Based on this survey, the relationship between population: dentist ratio and mean cost per dental visit were examined.

RESULTS

Nearly 40% of all practitioners reported that they had too few patients. They compensated for their loss of income by raising their fees, by recalling their patients more often and by increasing the cost per visit. The finding in the supplementary analysis using survey data from patients was similar to the findings in the main analyses using survey data from private dental practitioners.

CONCLUSION

The findings show that practitioners have market power. They were able to counteract a fall in demand for their services by providing more services and by raising their fees. The dental profession should be encouraged to provide appropriate services, in the present situation where supply exceeds demand.

A 30-year retrospective cohort outcome study of periodontal treatment of stages III and IV patients in a private practice

AIM

Tooth loss studies show that periodontal treatment is effective. However, it is not known whether these results can be projected into a lifetime of treatment. The aim of the study was to study all patients with stages III/IV of periodontitis over 30 years in a private practice.

MATERIALS AND METHODS

All patients referred between 1986 and 1990 were monitored for 30 years for tooth loss and prognostic factors. All dropouts were accounted for.

RESULTS

In all, 386 patients were followed, of whom 283 patients dropped out, leaving 103 patients (67 females and 36 males, average age 40.1 years) monitored over 30 years. Tooth loss was stable until 16 years, when the population was divided into groups of low (n = 65), moderate (n = 18) and high (n = 20) tooth loss, losing 1.05 (SD 1.27), 4.83 (SD 0.96) and 11.90 (SD 4.25) teeth, respectively. The strongest prognostic factors were first-degree relatives with periodontitis, periodontal treatment before the age of 35 years, diabetes and patients with teeth with initial hopeless prognosis.

CONCLUSION

The majority of patients with stages III and IV periodontitis could be successfully treated with conventional periodontal treatment over a period of 30 years. The findings suggest that retrospective studies with shorter observation times cannot automatically be projected onto the outcome of a lifetime of periodontal treatment.

Proposing a model for auditing data quality of long-term periodontal outcome studies

OBJECTIVE

The assessment of the success of conventional periodontal therapy is based on retrospective studies from private practice and university clinics. Due to their marked heterogeneity, it is difficult to assess the data quality and rate these studies. The aim is to test a model for auditing and rating the data quality of periodontal outcome studies.

METHODS

The method was adapted from the NIH Health Care Systems Collaboratory model, which uses three data quality dimensions: completeness (including all the relevant variables), consistency (ensuring that the same variables are compared) and accuracy (proportion of data in error with a gold standard). The model was applied to studies from a Norwegian specialist practice and data from the Norwegian Health database to test if the auditing process was workable using real world data.

RESULTS

Forty-seven risk and prognostic factors were included for completeness. Seven variables were specified for consistency: tooth loss, smoking, systemic conditions, oral hygiene, individual tooth prognosis, maintenance profiles and timing of extractions. The factors tested showed a 95.7% completeness and an average accuracy deviation from the gold standard of -2.3% for each of the risk/prognostic factors and an overall study score of 93.3%.

CONCLUSIONS

It was possible to develop a method for auditing and rating the quality of periodontal outcome studies. The model was tested using both real world data including risk and prognostic factors from individual outcome studies and national big data. The application of the model to these sets of data showed a high accuracy of the risk/prognostic factors and a close relationship with national big data.

Periodontal referral patterns in Norway: 2003 versus 2018

Objectives

Changes in periodontal referral patterns over time have been reported from the United States and Australia. To date, comparable studies have not been published from Europe. The objectives of the present study were to examine changes in periodontal referral patterns in Norway in 2003 versus 2018 and to compare these with trends observed in the United States and Australia using universal criteria for grading of periodontal severity.

Materials and methods

A retrospective analysis of 369 charts from four Norwegian periodontics clinics was completed. Data on year of referral, gender, age, tobacco smoking, periodontal status and missing teeth at initial examination, teeth planned for extraction, and periodontal case type were collected using a survey format; case type I, II, III, and IV representing increasing severity of periodontitis, case type V representing referral for other periodontal conditions (peri‐implantitis, refractory periodontitis, etc.). Chi‐square, t‐tests, and negative binomial regression were used for the statistical analysis.

Results

Compared with 2003, the 2018 data showed an increase in mean age at referral (p < 0.05), overall distribution of case type III and V (p = 0.047), and number of missing teeth (p = 0.001). Further, a decrease in prevalence of smokers (p < 0.05), but no change in number of teeth planned for extraction (p = 0.104), were observed.

Conclusions

During a period of 15 years, changes in periodontal referral patterns in Norway are similar to those in the United States and Australia. The adoption of a guideline‐based referral practice might be beneficial for both the dental profession and patients.

Improvements in Dental Health and Dentists' Workload in Norway, 1992 to 2015

OBJECTIVES

There has been a marked improvement in dental health in Norway during the last few decades. What effect has this had on provision of dental services, and how has private dental practitioners' assessment of their workload changed?

METHODS

The data were from 2 large surveys of private dental practitioners carried out in 1992 (n = 1056) and 2015 (n = 1237). An analysis of nonresponders showed that they were evenly distributed according to their age, gender, and the region in which their practice was located. Thus, the samples were representative of private dental practitioners. For 1 representative week in practice, the practitioners were asked to report the number of visits and the number of patients who received 1 or more of the following items of treatment: filling, crown, bridge, denture, root filling, extraction, and periodontal treatment. As a measure of patient supply, the responses from the following questions were used: "Based on an overall assessment of economy, workload, and other personal factors, is the number of regular patients adequate? If not, do you wish to have more patients or fewer patients?"

RESULTS

From 1992 to 2015, the annual number of visits per practitioner decreased by 23%. The number of patients per practitioner who received fillings, crowns, bridges, dentures, root fillings, or extractions decreased by 50% or more. The decrease was largest for practitioners younger than 35 years and for men. The proportion of practitioners who reported a deficit of patients increased from 20% to 37%.

CONCLUSIONS

Many dentists will have too few patients and a fall in income in the years to come is expected.

Age- and Time-Related Trends in Oral Health Care for Patients Aged 60 Years and Older in 2007-2017 in Public Oral Health Services in Helsinki, Finland

BACKGROUND

Population aging will likely have an impact on oral health care trends. The aim of this study was to describe age- and time-related trends in oral health care in people ages 60 and older in Public Oral Health Services (POHS) in Helsinki, Finland.

MATERIALS AND METHODS

Material for the study comprised the electronic documentation of oral health care procedures performed on patients 60 years and older (N = 282,143) in POHS during 2007-2017. Patients were aggregated into 5-year age groups. The 5 most common treatment categories, restorations, periodontal treatment, extractions, endodontics, and prosthetics, were selected for analysis. Changes by time (calendar year) and differences by age group were shown as percentages and percentage points; corresponding trends were assessed by applying linear regression models to the data.

RESULTS

The attendance rate for these patients increased from 14.5% in 2007 to 23.1% in 2017, with the total number of visits increasing by 76.4% in the 11-year period. The average number of visits per patient decreased from 3.5 visits in 2007 to 3.0 visits in 2017. In 2007, 60.5% of patients received restorative treatment and 41.3% received periodontal care. In 2017, the corresponding figures were 55.5% and 49.8%, respectively. The older the patient, the fewer the visits and restorative, periodontal, and endodontic treatments and the greater the rate of tooth extractions and prosthetics.

CONCLUSION

A declining age group-related trend was recognized for restorative, periodontal, and endodontic treatments. Owing to ongoing population growth, POHS will be facing huge challenges in providing treatment for all individuals seeking services.