Jackson Linger - Academia.edu (original) (raw)

Papers by Jackson Linger

Research paper thumbnail of disinfectant for dental unit waterlines Evaluation of a hydrogen peroxide

Research paper thumbnail of Evaluation of a hydrogen peroxide disinfectant for dental unit waterlines

The Journal of the American Dental Association, 2001

patient population exists, there have been no major outbreaks attributable to a DUWL that would s... more patient population exists, there have been no major outbreaks attributable to a DUWL that would suggest a quantifiable epidemiologic risk. Reports in the literature, however, do suggest that debilitated or immunocompromised patients are at greater Background. The purpose of this study was to investigate the use of a hydrogen peroxide-based dental unit waterline, or DUWL, treatment to reduce the colonization and growth of heterotrophic bacteria. Methods. Twenty-three dental units with self-contained water systems were randomly selected. Three of the units and tap water served as controls. Twenty-four water samples were taken at baseline and once a week for five weeks. They were serially diluted, spread-plated in duplicate onto R2A agar plates and incubated at 37 C for seven days. Results. At baseline, the tap water control had a mean count of 0 colony-forming units/milliliter, or CFU/mL, the three control DUWLs had a median count of 8,440 CFU/mL and the 20 treated DUWLs had a median count of 9,760 CFU/mL. By week 1, 19 (95 percent) of the 20 treated DUWLs had counts of less than 200 CFU/mL, and by week 4, the median count for all of the treated DUWLs was 0 CFU/mL. The measurement at week 5 showed that the reduction to below 200 CFU/mL had been maintained. Scanning electron micrographs from processed DUWL tubing samples revealed a similar pattern of results, with biofilm accumulation more evident in the untreated control specimens. Conclusions. Following the parameters of this study, the authors used a hydrogen peroxide-based disinfectant to achieve the ADA goal of no more than 200 CFU of heterotrophic, mesophilic bacteria per milliliter of unfiltered output water. Clinical Implications. An easy-to-use hydrogen peroxide-based DUWL disinfectant demonstrated effectiveness in improving the quality of water used for intraoral procedures. Protocol compliance meets the ADA year 2000 goal.

Research paper thumbnail of Color matching and shade selection for porcelain dental restorations : a thesis submitted in partial fulfillment ... restorative dentistry, operative / by Jackson B. Linger

Research paper thumbnail of Color distribution of three regions of extracted human teeth

Dental Materials, 1997

Objectives. Knowledge of human tooth color and its distribution are critical to the understanding... more Objectives. Knowledge of human tooth color and its distribution are critical to the understanding of shade matching in esthetic dentistry. The color of human teeth shows a gradation from the gingival to the incisal region. There have been many reports in the literature on the distribution of color in teeth, but not in the CIE 1976 L*a*b* system. This study was conducted to determine the color distribution in three regions in a sample of human teeth and express the results in Munsell notation, CIE 1976 L*a*b* and CIE AE* color differences. The hypothesis of this research was that it is possible to detect significant differences in the color parameters of the three distinct regions in teeth. Methods. All of the teeth used in this study were extracted, cleaned and stored in artificial saliva. Prior to measurement, the teeth were removed from the solution and mounted in a holder to ensure consistent measurements. Spectral data were collected using a GE recording spectrophotometer, CIE chromaticity coordinates calculated using CIE illuminant C and 1931 observer data, and conversions made to L*, a*, b* and Munsell notation. The results were analyzed by ANOVA and Scheff#s multiple comparisons test.

Research paper thumbnail of disinfectant for dental unit waterlines Evaluation of a hydrogen peroxide

Research paper thumbnail of Evaluation of a hydrogen peroxide disinfectant for dental unit waterlines

The Journal of the American Dental Association, 2001

patient population exists, there have been no major outbreaks attributable to a DUWL that would s... more patient population exists, there have been no major outbreaks attributable to a DUWL that would suggest a quantifiable epidemiologic risk. Reports in the literature, however, do suggest that debilitated or immunocompromised patients are at greater Background. The purpose of this study was to investigate the use of a hydrogen peroxide-based dental unit waterline, or DUWL, treatment to reduce the colonization and growth of heterotrophic bacteria. Methods. Twenty-three dental units with self-contained water systems were randomly selected. Three of the units and tap water served as controls. Twenty-four water samples were taken at baseline and once a week for five weeks. They were serially diluted, spread-plated in duplicate onto R2A agar plates and incubated at 37 C for seven days. Results. At baseline, the tap water control had a mean count of 0 colony-forming units/milliliter, or CFU/mL, the three control DUWLs had a median count of 8,440 CFU/mL and the 20 treated DUWLs had a median count of 9,760 CFU/mL. By week 1, 19 (95 percent) of the 20 treated DUWLs had counts of less than 200 CFU/mL, and by week 4, the median count for all of the treated DUWLs was 0 CFU/mL. The measurement at week 5 showed that the reduction to below 200 CFU/mL had been maintained. Scanning electron micrographs from processed DUWL tubing samples revealed a similar pattern of results, with biofilm accumulation more evident in the untreated control specimens. Conclusions. Following the parameters of this study, the authors used a hydrogen peroxide-based disinfectant to achieve the ADA goal of no more than 200 CFU of heterotrophic, mesophilic bacteria per milliliter of unfiltered output water. Clinical Implications. An easy-to-use hydrogen peroxide-based DUWL disinfectant demonstrated effectiveness in improving the quality of water used for intraoral procedures. Protocol compliance meets the ADA year 2000 goal.

Research paper thumbnail of Color matching and shade selection for porcelain dental restorations : a thesis submitted in partial fulfillment ... restorative dentistry, operative / by Jackson B. Linger

Research paper thumbnail of Color distribution of three regions of extracted human teeth

Dental Materials, 1997

Objectives. Knowledge of human tooth color and its distribution are critical to the understanding... more Objectives. Knowledge of human tooth color and its distribution are critical to the understanding of shade matching in esthetic dentistry. The color of human teeth shows a gradation from the gingival to the incisal region. There have been many reports in the literature on the distribution of color in teeth, but not in the CIE 1976 L*a*b* system. This study was conducted to determine the color distribution in three regions in a sample of human teeth and express the results in Munsell notation, CIE 1976 L*a*b* and CIE AE* color differences. The hypothesis of this research was that it is possible to detect significant differences in the color parameters of the three distinct regions in teeth. Methods. All of the teeth used in this study were extracted, cleaned and stored in artificial saliva. Prior to measurement, the teeth were removed from the solution and mounted in a holder to ensure consistent measurements. Spectral data were collected using a GE recording spectrophotometer, CIE chromaticity coordinates calculated using CIE illuminant C and 1931 observer data, and conversions made to L*, a*, b* and Munsell notation. The results were analyzed by ANOVA and Scheff#s multiple comparisons test.