IADR Abstract Archives
Influence of Two Erbium Lasers on Micro Push-out Bond Strength of Prefabricated and Individually Formed Fiber-Reinforced Composite Posts
Objectives: The objective of this in vitro study was to examine the influence of two erbium lasers on bond strength of prefabricated and individually formed fiber-reinforced composite (FRC) posts.
Methods: One hundred twenty six single-rooted human teeth were decoronated, endodontically treated and after post space preparation divided in two groups (n=63 per group) depending on the type of FRC posts, prefabricated GC Fiber Post (GC, Tokyo, Japan) and individually formed everStick Post (GC, Tokyo, Japan). Each group was further subdivided into three groups (n=21 per group), according to the pretreatment protocol after post space preparation: irrigation with saline (control group), laser-activated irrigation with Er:YAG and Er, Cr:YSGG laser. Finally, each group was subdivided into three subgroups (n=7) depending on the cement used: G-Cem LinkAce (GC, Tokyo, Japan), RelayX U200 (3M ESPE St.Paul, USA), SpeedCem (Ivoclar Vivadent, Schaan, Liechtenstein). After cementation of FRC posts, specimens were perpendiculary sectioned into 1 mm thin sectiones and push-out test was performed. Statistical anaysis was performed on log-transformed data using factorial ANOVA at level of significance set at 5%.
Results: The bond strength values were not affected by the type of post or cement used (p>0.05). Lower bond strength values were obtained for Er:YAG laser (3.27±1.58 MPa) in comparison to the control group (3.87±1.89) MPa, (p<0.05). There was no statistically significant difference in bond strength of both tested post groups in comparison to control group when Er,Cr:YSGG laser was used (p>0.05). No statistically significant difference in bond strength for tested post groups was observed when two erbium lasers were compared (p>0.05).
Conclusions: The bond strength was affected by the type of erbium laser used and Er:YAG laser lowered the bond strength for both prefabricated and individually formed FRC posts.
Methods: One hundred twenty six single-rooted human teeth were decoronated, endodontically treated and after post space preparation divided in two groups (n=63 per group) depending on the type of FRC posts, prefabricated GC Fiber Post (GC, Tokyo, Japan) and individually formed everStick Post (GC, Tokyo, Japan). Each group was further subdivided into three groups (n=21 per group), according to the pretreatment protocol after post space preparation: irrigation with saline (control group), laser-activated irrigation with Er:YAG and Er, Cr:YSGG laser. Finally, each group was subdivided into three subgroups (n=7) depending on the cement used: G-Cem LinkAce (GC, Tokyo, Japan), RelayX U200 (3M ESPE St.Paul, USA), SpeedCem (Ivoclar Vivadent, Schaan, Liechtenstein). After cementation of FRC posts, specimens were perpendiculary sectioned into 1 mm thin sectiones and push-out test was performed. Statistical anaysis was performed on log-transformed data using factorial ANOVA at level of significance set at 5%.
Results: The bond strength values were not affected by the type of post or cement used (p>0.05). Lower bond strength values were obtained for Er:YAG laser (3.27±1.58 MPa) in comparison to the control group (3.87±1.89) MPa, (p<0.05). There was no statistically significant difference in bond strength of both tested post groups in comparison to control group when Er,Cr:YSGG laser was used (p>0.05). No statistically significant difference in bond strength for tested post groups was observed when two erbium lasers were compared (p>0.05).
Conclusions: The bond strength was affected by the type of erbium laser used and Er:YAG laser lowered the bond strength for both prefabricated and individually formed FRC posts.