geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Effects of bonding materials on the mechanical properties of enamel around orthodontic brackets


, : Effects of bonding materials on the mechanical properties of enamel around orthodontic brackets. Angle Orthodontist 82(2): 187-195

To determine if the enamel around orthodontic brackets is significantly altered after demineralization followed by application of adhesives with and without fluoride-releasing ability. One hundred eight noncarious human premolars were divided into six groups of 18 each and exposed to a demineralization solution. Stainless steel brackets were bonded using two conventional composite resin etch-and-rinse systems, three self-etching primer (SEP) composite resin systems, and one resin-modified glass ionomer cement (RMGIC) system. One conventional and one SEP composite resin adhesive did not have fluoride-releasing ability, which was claimed for the other four adhesives. The elastic modulus and hardness of the enamel were determined with a nanoindenter at 10 equidistant depths ranging from 1-46 µm and at four regions: control (not exposed) enamel surface, under the adhesive, and at 50 µm and 100 µm from the bracket edges. Using the Kruskal-Wallis and Mann-Whitney U-tests (P < .0125 for statistical significance), these properties were compared at different regions. The same behavior was observed for values of elastic modulus and hardness. Significant differences were found within approximately 21 µm of the enamel surface for etching with 35% phosphoric acid or priming with SEP, but only minimal changes occurred for the SEP adhesive. Increases in near-surface elastic modulus and hardness of enamel were found with the SEP adhesive and RMGIC with fluoride-releasing ability. Clinical use of the fluoride-releasing adhesives investigated may prevent demineralization of enamel around brackets during orthodontic treatment.

US$19.90

PMID: 21827232

DOI: 10.2319/020411-78.1


Other references

Cherubini C.; Cotecchia V.; Giasi C.I.; Todaro G., 1989: Identification of outliers in geotechnical data. Pages 383-388 1989

Marshall, T.L.; MacCrimmon, H.R., 1970: Exploitation of selfsustaining Ontario stream populations of Brown trout (Salmo trutta) and Brook trout (Salvelinus fontinalis). J. Fish. Res. Bd Can.: 27: 1087-1102

Ngole, Veronica, M., 2007: Response of copper, lead and zinc mobility and bioavailability to sludge application on different soils. Sludge of two different ages (3 years old; Type I sludge, and 3 months old; Type 2 sludge) were applied to the following soil types: two luvisols, an arenosol and a vertisol at different rates to determine whether sludge application had any effect...

Assani, A.A.; Tardif, S.; Lajoie, F., 2006: Statistical analysis of factors affecting the spatial variability of annual minimum flow characteristics in a cold temperate continental region (southern Quebec, Canada). We have analyzed relationships between environmental factors (physiographic, climatic, geological, geographic and land use) and extreme minimum flow characteristics. We have defined 18 hydrological variables on the annual minimum flow series accor...

Schultze, J.; Hinrichs, M.; Kimmig, B., 1996: The role of strontium-90 surface application in the prevention of recurrent pterygium. Aim: Aim of the study was the evaluation of the role of adjuvant radiation therapy in the prevention of recurrence after excision. Patients and Methods: Between July 1, 1985 and April 1, 1993, 64 patients (43 male, 21 female) were referred to radi...

Sirotinin, N.N., 1967: The contribution of Soviet pathophysiologists to the growth of knowledge of the reactivity of the organism. Patologicheskaia Fiziologiia i Eksperimental'naia Terapiia 11(5): 18-24

Hayes, E.S.; Carlton, S.M., 1992: Primary afferent interactions: analysis of calcitonin gene-related peptide-immunoreactive terminals in contact with unlabeled and GABA-immunoreactive profiles in the monkey dorsal horn. The present study analyses the relationship of calcitonin gene-related peptide (CGRP)-immunoreactive primary afferent terminals with unlabeled and GABA-immunoreactive profiles in the primate (Macaca fascicularis) dorsal horn. One-hundred CGRP-immu...

Liddell P.A., 1988: Mimicry of photosynthetic charge separation in a carotenoid porphyrin diquinone molecular tetrad. Biophysical Journalpart 2: 271a

Lin, T.S.; Lucas, M.S.; Byrd, J.C., 2003: Rituximab in B-cell chronic lymphocytic leukemia. The monoclonal anti-CD20 antibody rituximab exerts its antitumor activity through a variety of mechanisms, including acting against the cellular defects in apoptosis that give rise to B-chronic lymphocytic leukemia (B-CLL). Phase II clinical studi...

Goldstein, E.; Wrubel, J.; Faigeles, B.; Decarlo, P., 1996: Is research important for non-governmental organizations in the United States?. ELEVENTH INTERNATIONAL CONFERENCE ON AIDS [Author] Eleventh International Conference on AIDS, Vol Two One world: One hope : 374