Effect of a fluoride varnish on the margin leakage and retention of luted provisional crowns
| Autor: | Israel Lewinstein, Nitzan Fuhrer, Yehuda Ganor |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Dye penetration
Molar Materials science Matched-Pair Analysis Varnish Acrylic Resins Dentistry Dental Cements Statistics Nonparametric Lacquer Dental Prosthesis Retention stomatognathic system Eugenol Materials Testing Confidence Intervals Humans Fluorides Topical Zinc Oxide-Eugenol Cement Coloring Agents Acrylic resin Cementation Leakage (electronics) Dental Leakage Universal testing machine Chi-Square Distribution Crowns business.industry Fluoride varnish Dental Bonding Luting agent Cariostatic Agents Dental Restoration Temporary visual_art visual_art.visual_art_medium Sodium Fluoride Thermodynamics Gentian Violet Stress Mechanical Oral Surgery Zinc Oxide business |
| Zdroj: | The Journal of prosthetic dentistry. 89(1) |
| ISSN: | 0022-3913 |
| Popis: | Statement of problem. Provisional crowns cemented with provisional luting agents are susceptible to washout, margin leakage, and secondary caries when placed for a prolonged period. Purpose. This study was conducted to determine the effect of combining a varnish containing 2.26% NaF with 2 provisional luting agents on the margin leakage and retention of provisional crowns. Material and methods. Acrylic resin provisional crowns were fabricated for 8 shoulder-prepared molars. The eight provisional (N=24) crowns were luted individually with Temp-Bond (TB), Freegenol (FG), or Duraphat (DU). Specimens were thermocycled 500 times (5° and 60° C) with a 1-minute dwell time, stored in 100% relative humidity at 37° C for 6 days, and then immersed in a 0.5% Gentian violet solution for 24 hours. Seven days after cementation, a removal test of the crowns (shear retention test) was conducted with a universal testing machine at a crosshead speed of 5 mm/min. Retention was determined as the maximum recorded force needed for crown dislodgment. DU varnish was applied to the inner surface of the dislodged crowns with no removal of the cement layer TB, FG (N=16). The crowns were relined with a 0.5-mm layer of acrylic resin and luted with a combination of luting agent and DU (TB, FG) N=16. No luting agent (NC) served as the control (N=8). Results were analyzed with the Wilcoxon matched-pairs signed-ranks test. Leakage at the margins was assessed with a 4-level dye penetration scale, and statistical differences were identified with a χ 2 test. All hypothesis testing was conducted at the 95% level of confidence. Results. The mean 7-day retention forces were as follows: 44.5 N (Temp-Bond), 51.6 N (Freegenol), and 35.9 N (Duraphat). There were no significant differences among these values. Duraphat combined with Freegenol decreased the retention of provisional crowns, but Duraphat combined with Temp-Bond increased the retention of provisional crowns by 69-145%. Duraphat alone and in combination with both provisional luting agents significantly reduced margin leakage ( P Conclusion. With regard to retention and margin leakage, the results of this study suggest that Duraphat varnish can be successfully used as provisional luting agent for single provisional crowns. (J Prosthet Dent 2003;89:70-5.) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect