| Summary: | Saleh Zidan,1,2 Nikolaos Silikas,1 Julfikar Haider,3 Abdulaziz Alhotan,1 Javad Jahantigh,1 Julian Yates1 1Dentistry, School of Medical Sciences, University of Manchester, Manchester M13 9PL, UK; 2Department of Dental Materials, Faculty of Dentistry, Sebha University, Sebha, Libya; 3Department of Engineering, Manchester Metropolitan University, Manchester M1 5GD, UKCorrespondence: Saleh ZidanDentistry, School of Medical Sciences, University of Manchester, Coupland Building 3, Oxford Road, Manchester M13 9PL, UKTel +44-7933096536Email saleh_0072002@yahoo.co.ukPurpose: This study evaluated tensile bond strength (TBS) between anterior acrylic teeth and denture bases made of high-impact heat-cured acrylic resin (HI PMMA) impregnated with zirconia nanoparticles.Materials and Methods: A total of 30 specimens (each specimen containing a set of six upper anterior teeth) were fabricated from HI PMMA denture base acrylic resin reinforced with different weight concentrations of zirconia nanoparticles: 0% (control), 1.5%, 3%, 5%, 7% and 10%. TBS was tested according to a British standard (BS EN ISO 22112: 2017). A one-way analysis of variance (ANOVA) was employed with a Tukey post-hoc test.Results: TBS values between the anterior teeth (central and lateral incisors and canine) and HI-PMMA denture base groups containing 7 wt.% (261.5 ± 66.0 N, 172.5 ± 57.4 N and 271.9 ± 86.3 N) and 10 wt.% (332.1 ± 122.9 N, 165.4 ± 48.7 N and 301.6 ± 73.2 N) zirconia were significantly lower compared to the control group (645.4 ± 84.8 N, 306.1 ± 81.6 N and 496.7 ± 179.1 N) and the other nanocomposite groups. However, TBS values for HI PMMA with 1.5 wt.% (534.4 ± 115.3 N, 304.7 ± 86.4 N, 514.0 ± 143.2 N), 3 wt.% (685.7 ± 159.6 N, 281.1 ± 78.3 N, 462.6 ± 122.1 N) and 5 wt.% (514.5 ± 134.3 N, 229.8 ± 67.3 N, 387.2 ± 99.4 N) zirconia showed slightly lower values than that of the control group but these were not significant. Failure modes between the teeth and denture base nanocomposites were predominantly cohesive fractures, which were clinically acceptable according to the Standard.Conclusion: The addition of zirconia nanoparticles to HI PMMA denture base at high concentration (7 wt.% and 10 wt. %) significantly (p< 0.05) reduced the bonding strength for all types of anterior teeth compared to the control group.Keywords: denture, PMMA, zirconia; ZrO2, nanocomposite, tensile bond strength; TBS, failure mode
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