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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (5): 968-972. doi: 10.19723/j.issn.1671-167X.2019.05.030

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Evaluation of modified micro-push-out bond strength of glass fiber posts with chemically treated resin cements

Qian CHEN1,Xin-zhi WANG2,△()   

  1. 1. Second Clinical Division,Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100101, China
    2. Department of Prosthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China
  • Received:2017-09-22 Online:2019-10-18 Published:2019-10-23
  • Contact: Xin-zhi WANG E-mail:xinzwang@sina.com.cn

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Abstract:

Objective: To evaluate the modified micro-push-out bond strengths of prefabricated glass fiber posts with silaneafter 35% phosphoric acid to resin cements. Methods: In the study, 40 glass fiber posts were randomly divided into 2 groups (20 posts in each group) for different surface treatments. Group 1, treated with silaneafter 35% phosphoric acid;group 2, no surface treatment (Control group). Then each group was randomly divided into 2 minor groups (modified group and traditional group), with each group with 10. So the four groups were group 1M (phosphoric acid + silane-modified), group 1T (phosphoric acid + silane-traditional), group 2M (control-modified), and group 2T (control-traditional). A modified micro-push-out bond strength test method was used in modified groups. In traditional groups, the 20 extracted human, single-rooted teeth were endodontically treated. Gutta-percha was removed with #1-2 Peeso Reamers (Mani), and the post space of each specimen was enlarged with a standard drill system from the corresponding fiber post system to create a 9 mm post space with at least 4 mm of filling material in the root apex. Following post cementation according to the manufacturer’s instructions, the traditional micro-push-out bond strengths were tested using a universal testing machine(0.5 mm/min). Both failure modes were examined with a stereomicroscope. The data of the four groups were statistically analyzed using the one-way ANOVA test(α= 0.05). Results: The bond strengths were (18.85±1.42) MPa for group 1M, (19.39±1.35) MPa for group 1T, (11.26±1.57) MPa for group 2M, and (11.27±1.83) MPa for group 2T. The bond strength of Group 1 was significantly higher than that of group 2(P<0.05), no matter which method was used. The fracture mode 100% in group M was the destruction of the post/resin interface, compared with 65.7% in group T. Conclusion: In contrasted to the traditional micro-push-out test, the modified test can evaluate the bond strength of fiber post to resin cement more effectively, and 35% phosphate acid + silane treatment can improve the bonding strength.

Key words: Modified, Micro-push-out, Glass fiber posts, Phosphate acid, Silane

CLC Number: 

  • R783.1

Table 1

Surface treatment of fiber posts in groups"

Group (post n=40) Surface treatment
Group 1, 30% phosphoric
acid+silane (n=20)		 The posts surface was ultrasonically cleaned in ethanol before use (50 Hz, 0.5 h) for 30 seconds followed by air drying, immersion in 35% phosphoric acid. A silane coupling agent (Prosil; FGM) was applied with a microbrush and left to dry 60 seconds according to the manufacturer’s instruction
Group 2, control (n=20) The posts surface was ultrasonically cleaned in ethanol before use (50 Hz, 0.5 h) for 30 seconds, dried

Table 2

Fiber post cemented of modified and traditional micro-push-out"

Tests Specific steps of fiber post cemented
Modified micro-push-out 1. Mix base past and catalyst paste into a homogenous paste within 20 seconds using a spatula according to the
manufacturer’s instructions. Avoid incorporating air bubbles. Apply the mixed cement evenly to the mold, a
Teflon post (special design RTD; 30 μm thicker than the #1 post) was used for 9 mm. The cement was cured for
20 seconds (Figure 1)
2. The teflon post was removed and freshly mixed cement was inserted into the space left by the Teflon post, followed
by the definitive placement of the fiber post (Figure 2)
Traditional micro-push-out 1. Twenty extracted human, single-rooted teeth were endodontically treated
2. Gutta-percha was removed with #1-2 peeso reamers (Mani), and the post space of each specimen was enlarged
with a standard drill system from the corresponding fiber post system to create a 9 mm post space with at least
4 mm of filling material in the root apex. The post space was rinsed with distilled water and dried with paper points.
3. Fiber posts for each group were cemented to the root canals with adhesive resin cement, according to the
manufacturer’s instructions

Figure 1

Step 1 of modifiedmicro-push-out"

Figure 2

Step 2 of modified micro-push-out"

Figure 3

Schematic illustration of measuring the test specimen"

Table 3

Micro push-out bond strength values in groupsand the distribution of failure modes"

Group
(n=10)		 Treatment Bond strength/MPa,
x?±s		 failure modes, n
Adhesive p/r* Adhesive d/r* Cohesive Mixed
1M 30%phosphoricacid+silane modified micro-push-out 18.85±1.42 60 - 0 0
1T 30%phosphoricacid+silane 19.39±1.35 44 10 5 1
2M traditional micro-push-out no treatment 11.26±1.57 60 - 0 0
2T modified micro-push-out no treatment
traditional micro-push-out		 11.27±1.83 35 16 4 5
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