281) 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). |
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. |
(1)67 differences | (15)5 correlations | (29)3 influence | (44)2 dose-dependent |
(2)40 increase | (16)5 effects | (30)3 negative | (45)2 elevation |
(3)36 difference | (17)5 for | (31)3 number | (46)2 evidence |
(4)28 decrease | (18)5 increases | (32)3 roles | (47)2 factors |
(5)12 reduction | (19)5 risk | (33)2 (P | (48)2 group |
(6)11 predictors | (20)4 effect | (35)2 alterations | (49)2 inhibition |
(7)10 association | (21)4 in | (36)2 and | (50)2 interaction |
(8)9 improvement | (22)4 reductions | (37)2 at | (51)2 morbidity |
(9)8 *null* | (23)4 relationship | (38)2 between-group | (52)2 positive |
(10)7 changes | (24)3 (p | (39)2 blood | (53)2 prediction |
(11)7 predictor | (25)3 alteration | (40)2 challenge | (54)2 proportion |
(12)7 role | (26)3 as | (41)2 contribution | (55)2 source |
(13)6 correlation | (27)3 higher | (42)2 cytotoxic | (56)2 time |
(14)5 associations | (28)3 improvements | (43)2 decreases |
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