85) Before the core build-up procedure, representative specimens from each group were chosen to determine the surface roughness (Ra) at three different areas using a contact profilometer, while after the procedure, 1.5-mm-thick discs were sectioned and the micro push-out method was used to assess the bond strength of the core build-up material to the fiber post in each group. |
PMID:23929564 DOI:10.1007/s10103-013-1412-4 |
2015 Lasers in medical science |
* Effect of Er:YAG laser pretreatment on bond strength of a composite core build-up material to fiber posts. |
- The study evaluated the micro push-out bond strength of resin material (Multicore Flow) to two types of fiber posts (FP), namely fiber-reinforced composite (FRC) Postec and Radix Fiber posts using Er:YAG laser pretreatment. FP were divided into four groups, two being control groups. Before the core build-up procedure, representative specimens from each group were chosen to determine the surface roughness (Ra) at three different areas using a contact profilometer, while after the procedure, 1.5-mm-thick discs were sectioned and the micro push-out method was used to assess the bond strength of the core build-up material to the fiber post in each group. Two-way analysis of variance was used for statistical analysis with the level of significance set at p < 0.05. Scanning electron microscopy was used to analyze the post surfaces after Er:YAG laser pretreatment and to classify the failure mode after loading. The type of pretreatment (p < 0.001) and an interaction between the pretreatment and type of post (p < 0.001) had a significant effect on the bond strength, while the type of post did not (p = 0.965). The mean bond strength in the Er:YAG laser pretreatment group was significantly lower compared to the FRC Postec posts control group (p < 0.001), while there was no significant difference between the Radix Fiber posts groups (p = 0.680). Mean Ra values from the Er:YAG laser pretreatment groups were significantly higher compared to control groups (p < 0.001). Er:YAG laser pretreatment at tested parameters negatively affected the bond strength of Multicore to FP and cannot be recommended as a standard procedure. |
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(4)9 doses | (21)3 degrees | (38)2 dosing | (55)2 patterns |
(5)7 concentrations | (22)3 effects | (39)2 ethnic | (56)2 perspectives |
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(9)4 *null* | (26)3 parts | (43)2 genes | (60)2 scenarios |
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(11)4 combinations | (28)3 species | (45)2 human | (62)2 surface |
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(13)4 groups | (30)2 abutments | (47)2 internal-cone | (64)2 than |
(14)4 methods | (31)2 and | (48)2 laser | (65)2 therapeutic |
(15)4 stages | (32)2 approaches | (49)2 masking | (66)2 tissues |
(16)4 tilt | (33)2 bleaching | (50)2 materials | (67)2 versions |
(17)3 adhesive | (34)2 changes | (51)2 molecular | (68)2 views |
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