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Biomedical subjects

E J DeSchepper

Publications and source records attributed to E J DeSchepper.

12 recordsLinked to original sources
PubMed1992

Postoperative pain incidence related to the type of emergency treatment of symptomatic pulpitis.

Some endodontic emergencies occur as a result of attempts to relieve symptoms of pulpitis. The aim of this study was to identify any predictor of postoperative pain in a patient population treated by dental students. Patients who reported for treatment of symptomatic pulpitis were subjected to three different emergency treatment regimens. Clinical data was collected on those patients who reported in the emergency service with severe postoperative pain within 24 hours of emergency endodontic treatment. Statistical analysis of these data suggested that the type of endodontic emergency procedure carried out was a significant predictor of severe postoperative pain.

Adolescent↗
PubMed1992

Quantitative analysis of six composite polishing techniques on a hybrid composite material.

Determining the best technique for finishing and polishing composite resins is important to ensure longevity of the restoration and prevention of recurrent decay and periodontal disease. This study quantitatively compared the surface roughness of a small particle hybrid composite material finished and polished using six different techniques. Five composite samples were randomly assigned to one of six polishing techniques. Uniform composite surfaces were prepared by finishing samples with a 600-grit carborundum disk prior to polishing. The unpolished surfaces were analyzed with the Taylor-Hobson Talysurf 10 surface texture measuring instrument. The surfaces were then polished and analyzed again. There were no statistical differences among treatment groups prior to polishing. There was a statistical difference between treatment groups after polishing. The smoothest surfaces were obtained using Centrix System rubber points alone, Centrix System rubber points plus Caulk's Prisma Gloss fine and super-fine pastes, and Caulk's Enhance disks plus Caulk's Prisma Gloss fine and super-fine pastes. There was no statistical difference between these methods and 3M Sof-flex disks alone. The roughest surface was produced by the Enhance disks only without using the Prisma Gloss pastes. There was no statistical difference between this method, however, and the use of Sof-flex disks plus Kerr's Lustre Paste. Lustre Paste, included with Herculite kits, did not improve a surface polished with Sof-flex disks.

Analysis of Variance↗
PubMed1991

A comparative study of fluoride release from glass-ionomer cements.

This study compared the amounts and patterns of fluoride release from 11 commercially available glass-ionomer cements into artificial saliva over an 84-day period. The results indicated that the materials differed in the amount of fluoride released, and that Miracle Mix released the highest cumulative total of fluoride over the test period. Along with old Fuji II, Miracle Mix also released the most fluoride during the last time interval (56 to 84 days). All of the materials released the greatest proportion of their cumulative total fluoride in the first 24 hours after mixing.

Fluorides↗
PubMed1990

Fluoride release from light-cured liners.

This study compared the relative amounts and patterns of fluoride release from six commercially available light-cured liners in artificial saliva over a 28-day period. Cavalite and two Zionomer products released relatively small amounts of fluoride. Timeline and XR Ionomer released the highest cumulative total of fluoride over time. During the last time interval (14-28 days), Timeline released the greatest amount of fluoride. Patterns of fluoride release for all materials were similar with the largest proportion of the total fluoride release being in the first 24-48 hours, followed by a dramatic reduction in release rate.

Dental Cavity Lining↗
PubMed1990

Fracture strength of Class I versus Class II restored premolars tested at the marginal ridge. I. Standard preparations.

Two groups of maxillary premolars with Class I cavities were prepared with one marginal ridge thickness to a width of 1.0 mm. One group was restored with amalgam and the other group with composite resin. Two groups of Class II cavities also were prepared and restored with amalgam and composite resin. The teeth in the four treatment groups were subjected to a centric load at the marginal ridge until fracture occurred. A two-factor analysis of variance revealed a statistically significant difference between the class of preparation (Class I preparations were weaker than were Class II preparations) but differences in strength between restorative materials (composite resin versus amalgam) and the interaction effect (class of preparation x restorative materials) were not found to be statistically significant (alpha = .05). A Newman-Keuls sequential range test found no statistically significant differences in strength between groups (alpha = .05). Fracture patterns were observed under scanning electron microscope. Fractures extended into the enamel and into the material in the Class I composite resin, Class I amalgam, and Class II composite resin restorations. Fractures extended only into the material in Class II amalgam restorations.

Bicuspid↗
PubMed1989

Antibacterial effects of glass ionomers.

Glass ionomer cements have been shown to possess antimicrobial activity. Proposed mechanisms of action include acidity and fluoride. It was the purpose of this study to determine the antimicrobial effect of 11 glass ionomer cements, their individual powder and liquid components and one resin-bonded liner containing high fluoride ionomer glass against Streptococcus mutans #6715. The role of fluoride and pH in the antibacterial activity was also studied. Using agar diffusion assay methodology, the following results were obtained. All of the glass ionomer cements were inhibitory against S. mutans. The antibacterial cements and slurries that were tested for fluoride, released the ion in excess of reported minimum inhibitory values. The antimicrobial activity of the liquid components, that were tested for the effects of pH changes, was totally lost when the pH was adjusted to 5. The resin bonded liner was inactive against S. mutans and did not release inhibitory concentrations of fluoride. These results indicate that freshly-mixed glass ionomer cements are antimicrobial against S. mutans and that the mechanism of action is probably a function of both fluoride and pH although additional factors may be involved.

Dental Cements↗
PubMed1989

Antibacterial effects of light-cured liners.

Light-cured liners and glass ionomers have recently been introduced and it has not been established if they are antimicrobial. This study determined the effectiveness of several light-cured liners against Streptococcus mutans #6715. Fluoride release and pH determination tests were performed to define their antibacterial activity. After evaluation with agar diffusion methodology, two of the light-cured glass ionomers were considered inhibitory. These two liners released fluoride into the agar in excess of the minimum inhibitory value of 20 ppm. The other four materials released fluoride below reported inhibitory values, failed to lower the pH below 4.0 and were ineffective against Streptococcus mutans. The findings suggested that light-cured glass ionomers react similarly to conventionally-cured glass ionomers regarding antibacterial activity against Streptococcus mutans. It also indicated that antibacterial activity was dependent upon a lower pH. Fluoride release may not be as important to the mechanism of action; however, it cannot be ruled out.

Dental Cavity Lining↗
PubMedDate not supplied

In vitro tensile bond strengths of amalgam to treated dentin.

Since amalgam traditionally relies on undercuts in the tooth preparation for retention, extensive tooth structure must be removed for amalgam core build-ups. In contrast, the ideal build-up material would achieve its retention by directly bonding to tooth structure. This study compared tensile bond strengths of amalgam to dentin using All-Bond Liner-FX with three different dentin pretreatment conditions and Amalgambond according to the manufacturer's directions. One hundred and twenty dentin samples were tested. Groups 1-3 used All-Bond Liner-FX as a bonding agent. Group 1 received a 15-second application of 10 percent phosphoric acid on the dentin; Group 2 received the recommended dentin conditioner; and Group 3 received no dentin pretreatment. Group 4 used Amalgambond as the bonding agent after a 10-second application of 10 percent citric acid/3 percent ferric chloride. Analysis of the data was conducted using both ANOVA and the Weibull statistic. Results of the analysis of variance indicate that there were no statistical differences among mean tensile bond strengths for the three dentin pretreatment conditions using All-Bond. All (30) of the Amalgambond specimens debonded prior to testing. The All-Bond fracture data was well described by the Weibull function as evidenced by the high coefficient of determination (R2 = 0.98-0.99). Fracture analysis indicated that all of the Amalgambond failures were adhesive at the Amalgambond-amalgam interface. All-Bond fractures were mixed cohesive/adhesive failures indicating similar bonding to amalgam and dentin.

Acid Etching, Dental↗
PubMedDate not supplied

In vitro bond strength of repaired amalgam with adhesive bonding systems.

The in vitro tensile bond strengths of Amalgambond and All-Bond were evaluated as adhesive systems for the repair of amalgam (Valiant Ph.D.) by two repair amalgams (Valiant or Valiant Ph.D.). Other variables evaluated were two surface finishes (SiC finish and sandblasted) and two storage conditions (37 degrees C, 24 h, and thermocycled). The Amalgambond bond was not reliable. All-Bond bonded amalgam to amalgam with Liner-FX. Bond strengths ranged from 3.4 to 8.8 MPa. The highest bond strengths were achieved with a sandblasted surface repaired with Valiant. Thermocycling did not affect bond strength.

Analysis of Variance↗