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Keywords = precoated bracket

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10 pages, 3076 KiB  
Article
Shear Bond Strength of Polypropylene Fiber in Orthodontic Adhesive on Glazed Monolithic Zirconia
by Dhanabhol Riowruangsanggoon, Apiwat Riddhabhaya, Nattisa Niyomtham and Irin Sirisoontorn
Polymers 2022, 14(21), 4627; https://doi.org/10.3390/polym14214627 - 31 Oct 2022
Cited by 5 | Viewed by 1832
Abstract
This study aims to compare shear bond strength (SBS) and mode of failure (MOF) between ceramic and metal orthodontic brackets on glazed monolithic zirconia using non-woven polypropylene fiber adhesive. Sixty glazed and sintered zirconia blocks were divided into six groups and attached with [...] Read more.
This study aims to compare shear bond strength (SBS) and mode of failure (MOF) between ceramic and metal orthodontic brackets on glazed monolithic zirconia using non-woven polypropylene fiber adhesive. Sixty glazed and sintered zirconia blocks were divided into six groups and attached with orthodontic brackets as follows: CS, ceramic bracket with silane; CB, ceramic bracket with bonding agent; CBS, ceramic bracket with bonding agent and silane; MS, metal bracket with silane; MB, metal bracket with bonding agent; and MBS, metal bracket with bonding agent and silane. There was a statistically significant difference in mean SBS values (p < 0.001). The CS group showed the highest SBS value (23.42 ± 3.88 MPa). On the other hand, the lowest was found in the MB group, which was not statistically different from the CB group (3.26 ± 0.76 and 5.09 ± 1.50 MPa, respectively). The MS, MBS, and CBS groups showed no statistical difference compared to each other (15.57 ± 4.01, 13.23 ± 5.47, and 12.77 ± 4.43 MPa, respectively). SBS is highest when a ceramic bracket with silane is bonded to glazed monolithic zirconia. Full article
(This article belongs to the Special Issue Polymers Composites for Dental Applications)
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9 pages, 1325 KiB  
Article
Shear Bond Strength and Mode of Failure of Polypropylene Fibers in Orthodontic Flash-Free Adhesive
by Kitiporn Chaimaungchuen, Apiwat Riddhabhaya, Nattisa Niyomtham and Irin Sirisoontorn
Polymers 2022, 14(19), 4167; https://doi.org/10.3390/polym14194167 - 4 Oct 2022
Cited by 2 | Viewed by 1951
Abstract
The purpose of this research is to evaluate the effects of magnetostrictive and piezoelectric scalers on the shear bond strength (SBS), failure mode of the polypropylene fiber adhesive brackets, and the load of both scaler tips. The adhesive precoated (APC) Flash-Free brackets were [...] Read more.
The purpose of this research is to evaluate the effects of magnetostrictive and piezoelectric scalers on the shear bond strength (SBS), failure mode of the polypropylene fiber adhesive brackets, and the load of both scaler tips. The adhesive precoated (APC) Flash-Free brackets were placed on the buccal surfaces of sixty maxillary first premolars, which were divided into three equal groups of 20 specimens each, following the control group (no scaling), the magnetostrictive group, and the piezoelectric group. All specimens were measured for SBS value by using a universal testing machine at a crosshead speed of 0.75 mm/minute. The mode of failure was examined under a×10 magnification light microscope digital camera and scores for the adhesive remnant index (ARI) were recorded and measured load between the magnetostrictive and piezoelectric groups. For statistical analysis, ANOVA and multiple comparison, as well as unpaired t-test and chi-square tests, at the 0.05 significance level were used. The results showed that the average SBS value of the control group was greater than that of the magnetostrictive group and the piezoelectric group. However, the SBS was not significantly influenced by ultrasonic instruments (p > 0.05). The ARI score and load showed no significant differences among the groups (p > 0.05). In conclusion, the SBS of the APC Flash-Free bracket wasn’t affected by using ultrasonic instrumentation around the base of the bracket. Full article
(This article belongs to the Special Issue Polymers Composites for Dental Applications)
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