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Flexural strength of nano-hybrid resin composite as a function of light attenuation distance and specimen dimension


El-Askary, Farid Sabry; Botros, Sara Adel; Nassif, Mohamed Salah Abdelaziz; Özcan, Mutlu (2017). Flexural strength of nano-hybrid resin composite as a function of light attenuation distance and specimen dimension. Journal of Adhesion Science and Technology, 31(5):520-529.

Abstract

This study evaluated ascending order of light attenuation distance (0,2,4,8 mm) and specimen dimensions (2x2x10, 2x2x12, 2x2x15 mm3) differing from requirements of ISO 4049 (2x2x25 mm3) on the flexural strength of nano-hybrid resin composite. Specimens (N=160) were prepared accordingly and randomly assigned into groups for the factors studied. Specimens were photo-polymerized from increased distances through 1, 2, 3 and 5 overlapping cycles depending on the specimen length after which they were subjected to three-point bending test (0.5 mm/min). Data were statistically analyzed using one-way, two-way ANOVA and Tukey`s HSD post-hoc tests (α=0.05). Two-parameter Weibull modulus, scale (m) and shape (0) were calculated. Both light attenuation distance (p˂0.001) and specimen dimensions (p˂0.001) significantly affected the results. Regardless of the specimen dimensions, 0, 2 mm polymerization distance resulted in significantly higher mean flexural strength compared to 4 and 8 mm. Polymerization distance did not significantly affect the mean flexural strength of specimens prepared according to ISO norms (p>0.05). Weibull distribution presented the highest shape (m) for 10-8 mm (24.65), 12-4 mm (14.54), 15-2 mm (12.32), 25-2 mm (17.56), length-light distance combinations. Specimen dimensions prepared in accordance with ISO 4049 do not allow for comparison of the effect of light attenuation distance on the flexural strength of resin composite tested.

Abstract

This study evaluated ascending order of light attenuation distance (0,2,4,8 mm) and specimen dimensions (2x2x10, 2x2x12, 2x2x15 mm3) differing from requirements of ISO 4049 (2x2x25 mm3) on the flexural strength of nano-hybrid resin composite. Specimens (N=160) were prepared accordingly and randomly assigned into groups for the factors studied. Specimens were photo-polymerized from increased distances through 1, 2, 3 and 5 overlapping cycles depending on the specimen length after which they were subjected to three-point bending test (0.5 mm/min). Data were statistically analyzed using one-way, two-way ANOVA and Tukey`s HSD post-hoc tests (α=0.05). Two-parameter Weibull modulus, scale (m) and shape (0) were calculated. Both light attenuation distance (p˂0.001) and specimen dimensions (p˂0.001) significantly affected the results. Regardless of the specimen dimensions, 0, 2 mm polymerization distance resulted in significantly higher mean flexural strength compared to 4 and 8 mm. Polymerization distance did not significantly affect the mean flexural strength of specimens prepared according to ISO norms (p>0.05). Weibull distribution presented the highest shape (m) for 10-8 mm (24.65), 12-4 mm (14.54), 15-2 mm (12.32), 25-2 mm (17.56), length-light distance combinations. Specimen dimensions prepared in accordance with ISO 4049 do not allow for comparison of the effect of light attenuation distance on the flexural strength of resin composite tested.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Fixed and Removable Prosthodontics
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:2017
Deposited On:01 Feb 2018 14:26
Last Modified:14 Mar 2018 17:30
Publisher:Taylor & Francis
ISSN:0169-4243
Additional Information:This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Adhesion Science and Technology on 16.08.2016, available online: http://wwww.tandfonline.com/10.1080/01694243.2016.1221251.
OA Status:Green
Publisher DOI:https://doi.org/10.1080/01694243.2016.1221251

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