A Comparison of Microtensile Bond Strength, Film Thickness, and Microhardness of Photo-Polymerized Luting Composites.

El-Askary, Farid; Hassanein, Abdullah; Aboalazm, Emad; Al-Haj Husain, Nadin; Özcan, Mutlu (2022). A Comparison of Microtensile Bond Strength, Film Thickness, and Microhardness of Photo-Polymerized Luting Composites. Materials, 15(9) MDPI 10.3390/ma15093050

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The aim of this study was to evaluate the effect of CAD/CAM composite thickness on micro-tensile bond strength (µTBS), microhardness (HV), and film thickness (FT) of different luting composites. Composite blocks (6.8 mm × 6.8 mm) were divided into 12 groups according to: CAD/CAM thickness and luting composite. For each group, 21 rods (1 mm × 1 mm) were tested in tension at crosshead speed of 1 mm/min. Fracture modes were categorized as adhesive, mixed, and cohesive. Microhardness (n = 5/group) was assessed using microhardness tester. Film thickness (12-rods/group) was evaluated using a stereomicroscope (×40). Data were analyzed using the two-way ANOVA/Tukey's HSD test (p = 0.05). Parameters "thickness", "cement", and "thickness x cement" showed significant difference on µTBS and HV (p < 0.05). At 2 mm, heated x-tra fil composite showed the highest µTBS (45.0 ± 8.5 MPa), while at 4 mm thickness, Grandio Flow revealed the lowest µTBS (33.3 ± 6.3 MPa). Adhesive, mixed, and cohesive failures were reported. The HV of all composites decreased when photo-polymerized through 4 mm thickness (p < 0.05). Regardless of CAD/CAM thickness, photo-polymerized composites can be successfully used for luting CAD/CAM composite.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology

UniBE Contributor:

Al-Haj Husain, Nadin

Subjects:

600 Technology > 610 Medicine & health

ISSN:

1996-1944

Publisher:

MDPI

Language:

English

Submitter:

Pubmed Import

Date Deposited:

23 May 2022 08:43

Last Modified:

07 Aug 2024 15:45

Publisher DOI:

10.3390/ma15093050

PubMed ID:

35591383

Uncontrolled Keywords:

CAD/CAM composite dual-cured resin cement film thickness microhardness photo-polymerized composite pre-heating µ-tensile bond strength

BORIS DOI:

10.48350/170159

URI:

https://boris.unibe.ch/id/eprint/170159

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