Five Cements' Post Retention Following Canal Obturation Using ZOE Sealer

Objectives: To compare the retention of prefabricated posts luted with 5 different cements in post spaces prepared 4 weeks following gutta percha/ZOE sealer obturation. A previous study had been performed using a 1-week interval. In that study, the 4-META cement failed to polymerize. All remaining cements [Panavia-21 (P-21); Fleck's zinc phosphate (ZnP); Ketac-Cem (GIC); Parapost Bis-GMA/EMA (PC)] were significantly less retentive than P-21 used in unobturated controls. P-21 had significantly greater retention than ZnP and PC. GIC had retention not statistically different from other set cements. Although residual eugenol was suspected as an etiologic factor, the sealer had not completely set. Methods: Ninety-six single-rooted teeth were instrumented up to size 5 Gates-Glidden, and divided into 6 groups (n=16). Five groups were obturated using gutta percha/ZOE sealer. A control group remained unobturated. Post space preparation (10-mm deep; size 6 Gates-Glidden) and cementation (size 5 Parapost) were performed 4 weeks later. After 48 hours, the dowels were removed with an InstronÔ 5566 in tensile mode at 1 mm min^-1. Data were analyzed using one-way ANOVA and Tukey test with significance set at p < .05. Results: The 4-META cement failed to polymerize. All (set) cements again had significantly lower retention strengths than unobturated controls (P-21). However, at 4 weeks, the relative strengths of P-21 and ZnP were reversed. ZnP demonstrated significantly greater retention than P-21 and PC. None of the other pairwise comparisons at 4 weeks were statistically significant. “4-week” ZnP was significantly more retentive than “1-week” ZnP. Conversely, “4-week” P-21 was significantly less retentive than “1-week” P-21. The ZOE sealer was completely set at 4 weeks. Conclusion: Residual eugenol and unset root canal sealer seem to have time-dependent and separate adverse effects on the retentive capabilities of specific dental cements. Performed under USAF Surgeon General-approved Clinical Investigation No. FDG 20010027E.

*1277 Five Cements' Post Retention Following Canal Obturation Using ZOE Sealer*
M.S. HAGGE¹, R.D.M. WONG¹, J.S. LINDEMUTH², and W.C. DANIELS³, ¹ University of the Pacific, San Francisco, CA, USA, ² Lackland Air Force Base, TX, USA, ³ Travis Air Force Base, CA, Travis AFB, CA, USA Objectives: To compare the retention of prefabricated posts luted with 5 different cements in post spaces prepared 4 weeks following gutta percha/ZOE sealer obturation. A previous study had been performed using a 1-week interval. In that study, the 4-META cement failed to polymerize. All remaining cements [Panavia-21 (P-21); Fleck's zinc phosphate (ZnP); Ketac-Cem (GIC); Parapost Bis-GMA/EMA (PC)] were significantly less retentive than P-21 used in unobturated controls. P-21 had significantly greater retention than ZnP and PC. GIC had retention not statistically different from other set cements. Although residual eugenol was suspected as an etiologic factor, the sealer had not completely set. Methods: Ninety-six single-rooted teeth were instrumented up to size 5 Gates-Glidden, and divided into 6 groups (n=16). Five groups were obturated using gutta percha/ZOE sealer. A control group remained unobturated. Post space preparation (10-mm deep; size 6 Gates-Glidden) and cementation (size 5 Parapost) were performed 4 weeks later. After 48 hours, the dowels were removed with an InstronÔ 5566 in tensile mode at 1 mm min^-1. Data were analyzed using one-way ANOVA and Tukey test with significance set at p < .05. Results: The 4-META cement failed to polymerize. All (set) cements again had significantly lower retention strengths than unobturated controls (P-21). However, at 4 weeks, the relative strengths of P-21 and ZnP were reversed. ZnP demonstrated significantly greater retention than P-21 and PC. None of the other pairwise comparisons at 4 weeks were statistically significant. “4-week” ZnP was significantly more retentive than “1-week” ZnP. Conversely, “4-week” P-21 was significantly less retentive than “1-week” P-21. The ZOE sealer was completely set at 4 weeks. Conclusion: Residual eugenol and unset root canal sealer seem to have time-dependent and separate adverse effects on the retentive capabilities of specific dental cements. Performed under USAF Surgeon General-approved Clinical Investigation No. FDG 20010027E.
Seq #163 - Other Ceramics and Cements 3:45 PM-5:00 PM, Friday, 14 March 2003 Henry B. Gonzalez Convention Center Exhibit Hall C
Back to the Dental Materials: III - Ceramics and Cements Program Back to the 32nd Annual Meeting and Exhibition of the AADR (March 12-15, 2003)
Top Level Search