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Biomedical subjects

W W Dodge

Publications and source records attributed to W W Dodge.

13 recordsLinked to original sources
PubMed2000

The UTHSCSA Dental School in the new millennium.

The UTHSCSA Dental School, just short of 30 years in existence, has made great strides to be a leader in dental education. Although increased use of computers has the greatest potential for revolutionizing dental education, there are other components that must constantly be evaluated and improved. A major curriculum review is in progress. The process is a grass roots effort to allow input from faculty, students, alumni and outside consultants. The school's competencies are being reevaluated to assure they are contemporary and the methods to assess them are valid and reliable. The way we evaluate applicants is an ongoing evolution. Our appropriate role in the community (local, national, and international) continues to be a challenge. Success will be measured by how well we continuously evaluate our mission and goals, identify problems and find and implement solutions.

Competency-Based Education↗
PubMed1999

Effect of powder-free latex examination glove use on airborne powder levels in a dental school clinic.

Cornstarch powder on latex examination gloves acts as an airborne carrier of natural latex allergens resulting in cutaneous, conjunctival, and/or respiratory responses to latex, a particular concern in a dental school environment where concentrated use of latex examination gloves occurs. This study measured airborne powder levels associated with a trial substitution of powder-free latex examination gloves for powdered latex examination gloves in a dental school clinic. Secondary aims of the study were to assess user acceptance of powder-free gloves during the trial and to assess the financial impact of converting the entire dental school to a powder-free environment. Air was sampled from two areas (dispensary and treatment room) of a student clinic fifteen to thirty minutes before the beginning of normal clinic sessions and again about 1.5 hours into the clinic session. The samples were microscopically analyzed for particulate counts of cornstarch powder. A written survey instrument assessed user acceptance of the two types of gloves. Historical financial data were used to estimate the cost of converting the entire dental school to a powder-free environment. Both the dispensary and the treatment room showed significant reductions in airborne powder counts during use of powder-free latex gloves and a return to high powder counts with resumption of powdered glove use. During the weeks of powdered glove use, the powder counts were also significantly lower before the beginning of the clinic session and higher during the clinic session. User acceptance of the powder-free latex gloves was high. The increased cost per year to convert the entire dental school to a powder-free environment was estimated to be $13,943.

Air Pollutants, Occupational↗
PubMed1993

A preliminary study of the effect of eliminating requirements on clinical performance.

This study determined the effect of a clinical program driven by patient needs upon students' productivity, attitudes, and academic performance. A group of eight senior students, whose academic and clinical performance profile replicated that of the rest of the class, were chosen to participate in a year-long non-requirement clinic. The students were expected to attend all clinic sessions, and treat their assigned patients. Their performance was compared to that of classmates in the regular requirement-driven curriculum. The non-requirement group had significantly higher academic achievement and significantly outproduced their classmates. Non-requirement students had no state board failures, versus 17 percent in the regular curriculum, and reported significantly lower stress. This study suggests that predoctoral clinical programs can maintain quality and productivity in the absence of unit requirements.

Attitude↗
PubMed1992

Effect of a fluoridated etchant on the shear bond strength of a composite resin to enamel.

The purpose of this study was to evaluate the effect of a fluoridated etching gel on the shear bond strength of a composite resin to enamel. A total of 75 extracted human permanent molars were used. A flat enamel surface was obtained with 600-grit silicon carbide paper and cleaned with a rubber cup and a water slurry of fine flour of pumice. The teeth were randomly distributed into 5 groups of 15 teeth each and etched as follows: group 1: 37% non-fluoridated phosphoric acid gel (Coe) for 60 seconds (control); group 2: 60% phosphoric acid gel with 0.5% NaF (Orthoprep) for 5 seconds; group 3: Orthoprep for 15 seconds; group 4: Orthoprep for 30 seconds; group 5: Orthoprep for 60 seconds. After etching, rinsing and drying, an unfilled resin (Coe Bond) was thinly applied with a brush and cured for 30 seconds. A nylon ring was placed over the area and filled with a light-cured composite resin (Occlusin). The teeth were thermocyled (100x), mounted in plastic cups and plaster, and sheared with a knife-edged blade in an Instron machine running at a crosshead speed of 1 mm/min. The results in MPa were as follows: group 1: 14.49 +/- 4.43; group 2: 10.81 +/- 3.70; group 3: 13.51 +/- 3.21; group 4: 14.79 +/- 3.76; group 5: 15.47 +/- 4.07. An analysis of variance showed that the results in groups 1, 4 and 5 were not significantly different but that the bond strengths in groups 2 and 3 were significantly lower. Fracture within the enamel occurred in 8 specimens in group 1, 5 in group 2, 6 in group 3, 8 in group 4, and 13 in group 5. In the fluoridated etchant groups the number of specimens showing enamel fracture increased as the application time of the etchant increased.

Acid Etching, Dental↗
PubMed1991

Comparison of wet and dry finishing of resin composites with aluminum oxide discs.

Samples of four composites (Herculite, Visio-Dispers, Silux, and Prisma-Fil) were finished with aluminum-oxide discs either wet or dry so that the effects of these two finishing procedures could be compared. The samples were evaluated for surface smoothness, color stability, and surface hardness. Surface smoothness was determined immediately after a sample was finished with a profilometer. Knoop hardness values were determined for each sample immediately after being finished and once a week for five weeks. Color stability was evaluated with a tristimulus colorimeter by the color of each sample being finished and once a week for five weeks. When surface smoothness was compared between the wet- and dry-finished samples, there was no significant difference between Prisma-Fil, Silux, or Herculite; however, the wet-finished Visio-Dispers was significantly rougher than the dry-finished. When surface hardness was compared, there was no significant difference in hardness values between the wet and dry samples when compared over time. When changes in color were evaluated, only Visio-Dispers had no significant change in color for both the wet- and dry-finished samples over the five-week evaluation period. Dry finishing of only one composite (Silux) produced a significant change in color. Dry finishing of composites was superior or equal to wet finishing in all tests except for the color change in Silux.

Aluminum Oxide↗
PubMedDate not supplied

Composite resin bond strength after enamel bleaching.

This study evaluated the effect of enamel bleaching with a commercial product on the sheer bond strength of a composite resin. A total of 45 human extracted permanent molars were used. A flat enamel surface was obtained with 600-grit SiC paper. The teeth were then randomly distributed into three groups of 15 teeth each: Group 1: Enamel etching with 37% phosphoric acid gel (Coe) for 60 seconds, placement of an unfilled resin (Coe) thinly applied with a brush and a composite resin (Occlusin); Group 2: Enamel bleaching (Rembrandt Lighten Bleaching Gel, Den-Mat) for one hour, etching for 60 seconds and placement of unfilled and composite resins. Group 3: Enamel bleaching for 24 hours, etching for 60 seconds, and placement of unfilled and composite resins. A nylon ring over the etched enamel retained the composite resin. The teeth were thermocycled (X100) and sheared with a knife-edged blade in an Instron machine running at a cross-head speed of 1 mm/min. The results in MPa were: Group 1: 12.86 +/- 4.83, Group 2: 12.33 +/- 2.95, and Group 3: 7.67 +/- 1.98. An ANOVA revealed that Groups 1 and 2 were significantly different from Group 3 (P < 0.001). Fracture within the enamel occurred in 53% in Group 1, 33% in Group 2, and 0% in Group 3. The study reveals that the shear bond strength of composite resins is significantly reduced after enamel bleaching for 24 hours.

Analysis of Variance↗