Adhesive performance of precoated brackets after expiration

Cloud, Cayce C.; Trojan, Terry M.; Suliman, Sam N.; Tantbirojn, Daranee; Versluis, Antheunis

doi:10.2319/030415-131.1

Cited by 4 publications

(3 citation statements)

References 7 publications

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“…The Flash Free Group 1 presented higher SBS values after 24 h, with a mean SBS of 10.27 MPa, compared to 8.23 MPa for the uncoated brackets (Group 2). In a study conducted by Cloud et al [9] the mean force used for debonding ceramic coated brackets was 161.7 N. Bakhadher and Talic [10] found lower SBS values for the coated brackets (7.50 MPa), similar to the control, uncoated group (7.36 MPa), with large gaps between the values for different samples (a maximum of 14.66 MPa and a minimum of 2.29 MPa).…”

Section: Experimental Part Materials and Methodsmentioning

confidence: 99%

Flash-Free Orthodontic Adhesive System Compared with the Conventional Direct Bonding Method

Szuhanek¹,

Golban²,

Negru³

et al. 2018

Rev. Chim.

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The latest technology in the field of orthodontic materials is represented by the Flash-Free Orthodontic Adhesive System. In the present study this novel technique is compared with the conventional direct bonding method. Ten extracted human premolars were separated into two groups: in the Group 1, APC Flash-Free Adhesive Coated Appliance System (3M Unitek, Monrovia, CA, USA) was bonded, while in the control Group 2, Clarity Advanced braces (3M Unitek, Monrovia, CA, USA) were bonded using XT Adhesive Paste (3M Unitek, Monrovia, CA, USA) applied by the clinician on the bracket base. Bonding times were recorded for each sample. Shear bond strength (SBS) was recorded using Zwick Zoel Z005. After debonding, the adhesive remnant index (ARI) was established for both groups. Group 1 showed a mean bonding time of 21 s, while Group 2 needed about 45 s for each bracket bonding. Both groups had clinically accepted SBS values, but the difference between them was significant (10.97 MPa versus 8.23 MPa). ARI scores were equal to 1 for most samples. In conclusion, reducing the time for bracket placing, APC Flash-Free Coated Appliance System showed a brackets bonding time reduced to half compared to the conventional technique. This aspect, combined with significantly higher SBS values, makes this novel system better than the classical one. For both groups, more than half of the adhesive remained on the bracket base, which facilitates cleaning after debonding.

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Section: Experimental Part Materials and Methodsmentioning

confidence: 99%

Flash-Free Orthodontic Adhesive System Compared with the Conventional Direct Bonding Method

Szuhanek¹,

Golban²,

Negru³

et al. 2018

Rev. Chim.

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“…Replacing a new ceramic bracket each time can be not only a waste of resources but also an economic burden on patients. Since ceramic brackets are expensive and maintain their shape and complete structure [ 11 ] after falling off, it is of great significance to develop methods of recycling and rebonding dislodged ceramic brackets in the same patients. Previous findings have varied with regard to the effectiveness of flaming [ 12 , 13 ], silica coating [ 14 , 15 ], and sandblasting [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Shear Bond Strength and Morphology of Er:YAG Laser-Recycled Ceramic Orthodontic Brackets

Han

Yang

et al. 2016

BioMed Research International

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Objective. The aim of this study was to compare the recycling of deboned ceramic brackets via an Er:YAG laser or via the traditional chairside processing methods of flaming and sandblasting; shear bond strength and morphological changes were evaluated in recycled brackets versus new brackets. Materials and Methods. 3M Clarity Self-Ligating Ceramic Brackets with a microcrystalline base were divided into groups subjected to flaming, sandblasting, or exposure to an Er:YAG laser. New ceramic brackets served as a control group. Shear bond strengths were determined with an Electroforce test machine and tested for statistical significance through analysis of variance. Morphological examinations of the recycled ceramic bracket bases were conducted with scanning electron microscopy and confocal laser scanning microscopy. Residue on the bracket base was analyzed with Raman spectroscopy. Results. Faded, dark adhesive was left on recycled bracket bases processed via flaming. Adhesive was thoroughly removed by both sandblasting and exposure to an Er:YAG laser. Compared with new brackets, shear bond strength was lower after sandblasting (p < 0.05), but not after exposure to an Er:YAG laser. The Er:YAG laser caused no damage to the bracket. Conclusion. Er:YAG lasers effectively remove adhesive from the bases of ceramic brackets without damaging them; thus, this method may be preferred over other recycling methods.

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“…Others concluded a degraded microhardness property for some of the expired dental composite materials [5,6] . It has been found that the actual shelf life of pharmaceutical products were also exceeding their expiration dates labeled [7,8,9] .…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Mechanical Properties of Expired and Non-Expired Resin Composite. A Comparative Study

Aziz

2019

Egyptian Dental Journal

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This in-vitro study evaluated the mechanical properties in terms of microhardness and degree of conversion of expired versus non-expired resin composite. A total of 120 standardized specimens were prepared for this study using Ceram.x one (E2 Enamel shade) resin composite, of which forty specimens were prepared using valid resin composite (E-0), the other forty specimens were prepared using 6 months-expired resin composite (E-6) and the last forty specimens using 12 months-expired resin composite (E-12). They were light cured using LED curing unit. 20 of each group were subjected to measurement of surface microhardness in Vickers hardness tester. The depth of cure was calculated by obtaining the microhardness ratio through dividing VHN of the bottom surface by VHN of the top surface. The other 20 specimens of each group were tested for the degree of conversion using Fourier transform infrared spectroscopy (FTIR). Data was then recorded, tabulated and statistically analyzed. The highest mean microhardness of the specimen's top was recorded for the group of 12-months expired resin composite (E-12: 83.17 ± 3.14), which was significantly different in relation to the group of 6-months expired resin composite (E-6: 72.17 ± 2.55) and the group of valid resin composite (E-0: 72.06 ± 4.20). Regarding B/T ratio (%), there were no statistical significant difference between the three groups (E-0: 69.3 ± 10.1; E-6: 66.8 ± 3.9; E-12: 67.9 ± 4.9). As for the degree of conversion results there was no statistical significant difference between the three groups (E-0: 1.48 ± 0.14; E-6: 1.68 ± 0.20; E-12: 1.74 ± 0.18). In conclusion, expired resin composite within1 year interval showed optimum and accepted mechanical properties in terms of Degree of conversion and microhardness compared to that of non-expired resin composite.

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Adhesive performance of precoated brackets after expiration

Cited by 4 publications

References 7 publications

Flash-Free Orthodontic Adhesive System Compared with the Conventional Direct Bonding Method

Flash-Free Orthodontic Adhesive System Compared with the Conventional Direct Bonding Method

Analysis of Shear Bond Strength and Morphology of Er:YAG Laser-Recycled Ceramic Orthodontic Brackets

Evaluation of Mechanical Properties of Expired and Non-Expired Resin Composite. A Comparative Study

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