Effects of surface treatment on microtensile bond strength between polylactic acid absorbable post and composite resin core
LI Shu-ting
HUANG Hua
ZHOU Yong-ming
Abstract：AIM:To evaluate the effect of different surface treatment on the microtensile bond strength be-tween PLA post and composite resin core.METHODS:25 PLA posts were randomly divided into 5 groups(n =5)and coated with total-etch adhesive Prime&Bond NT (PB)(Group A),chloroform and then coated with PB(Group B);the mixture of chloroform and PB(C-PB)with the proportion of 1 ∶1(C-PB 1 ∶1)(Group C);the mixture of C-PB 1 ∶2(Group D);the mixture of C-PB 2 ∶1(Group E),respectively.5 quartz fiber posts coated with PB were set as group F.All treated posts were cemented with composite resin cores and shaped as rod-like bonding specimens and subjected to the microtensile bonding strength test.Failure modes of the specimens were observed under a stereo-microscope.Surface morphologies of fractured specimens were assessed by SEM.Data were statistically analyzed. RESULTS:The highest microtensile bond strength(MPa)was showed in group C (20.58 ±3.35,vs other groups P <0.05),followed by group E (13.35 ±3.21),D (12.80 ±2.77),F (12.24 ±1.40),B (10.91 ±1.61)and A (5.03 ±1.48).There was difference between each 2 of all the groups in fracture mode (P =0.000).In group C,the most common type of failure was resin cohe-sive failure.CONCLUSION:The microtensile bond strength between PLA post and composite resin core might be affected by the surface treatments of PLA post.The mixture of chloroform and PB with the proportion of 1 ∶1 may improve the adhesive strength between composite resin core and PLA posts.
Keywords：polylactic acid postmicrotensile bond strengthcomposite resin coresurface treatment
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 90-94 )