IADR Abstract Archives
Influence of Various Pretreatments of Dentin on Retention of Posts
Objectives: The purpose of this study was to evaluate the retention of prefabricated tapered titanium posts for endodontically treated teeth after the application of various pretreatments protocols on radicular dentin.
Methods: The coronal part of 32 teeth were removed 1 mm coronal to the cemento-enamel junction. All specimens received endodontic treatment and were then prepared with an ISO 90 preparation instrument to a depth of 10 mm to receive a titanium post. The specimens were randomly divided, according to the surface treatments of roughened dentin walls, into 4 groups (n=8): KW: etched with 20-30% polyacrylic acid (PAA) (Ketac Conditioner) and rinsed with water; KWI: etched with 20-30% PAA, rinsed with water and 70% isopropanol; DW: etched with 30-50% PAA (Durelon Liquid) and rinsed with water; DWI: etched with 30-50% PAA, rinsed with water and 70% isopropanol. The titanium posts were cemented with glass-ionomer cement. All specimen were stored in water (37°C, 3d). Then post retention was evaluated with a tensile test using a universal testing machine (Zwick Z010) with a crosshead speed of 2mm/min. Data were statistically analyzed using one-way ANOVA, followed by Tukey’s post-hoc to list pairwise comparisons between groups.
Results: Mean retention values ranged from a minimum of 201.8 ± 55.5 N (KW) to a maximum of 328.1 ± 70.9 N (DWI). Groups DWI and KWI (316 ± 58.3 N) showed statistically higher retention values than group KW, but did not significantly differ from retention values obtained in group DW.
Conclusions: Additional rinsing with isopropanol after using PAA increased the retention of posts significantly for all groups. Although group DWI achieved the highest retention values, pretreatment of radicular dentin as in group KWI may be equally considered.
Methods: The coronal part of 32 teeth were removed 1 mm coronal to the cemento-enamel junction. All specimens received endodontic treatment and were then prepared with an ISO 90 preparation instrument to a depth of 10 mm to receive a titanium post. The specimens were randomly divided, according to the surface treatments of roughened dentin walls, into 4 groups (n=8): KW: etched with 20-30% polyacrylic acid (PAA) (Ketac Conditioner) and rinsed with water; KWI: etched with 20-30% PAA, rinsed with water and 70% isopropanol; DW: etched with 30-50% PAA (Durelon Liquid) and rinsed with water; DWI: etched with 30-50% PAA, rinsed with water and 70% isopropanol. The titanium posts were cemented with glass-ionomer cement. All specimen were stored in water (37°C, 3d). Then post retention was evaluated with a tensile test using a universal testing machine (Zwick Z010) with a crosshead speed of 2mm/min. Data were statistically analyzed using one-way ANOVA, followed by Tukey’s post-hoc to list pairwise comparisons between groups.
Results: Mean retention values ranged from a minimum of 201.8 ± 55.5 N (KW) to a maximum of 328.1 ± 70.9 N (DWI). Groups DWI and KWI (316 ± 58.3 N) showed statistically higher retention values than group KW, but did not significantly differ from retention values obtained in group DW.
Conclusions: Additional rinsing with isopropanol after using PAA increased the retention of posts significantly for all groups. Although group DWI achieved the highest retention values, pretreatment of radicular dentin as in group KWI may be equally considered.