26 April 2024 : Animal Research
[In Press] The Impact of Repeated Steam Sterilization Cycles on the Efficacy of Chairside Adjustment Kits for Polishing Monolithic Multi-Layered Zirconia Dental Restoration Material
Mohammed E. Sayed 1ABEFG, Honey Lunkad 1ABEFG, Enas Jaber Mohana 2BCDEF, Sara Ahmad Mesawa 2BCDEF, Fatimah Ibrahim Dowairi 2BCDEF, Emad Aldeen A. Alharbi 2BCDEF, Hayat Ali Hakami 3BCEF, Hossam F. Jokhadar 4ACDEG, Nasser M. Alqahtani 5ACDEF, Abdullah Hasan Alshehri 5CDEFG, Ebrahim Fihaid Alsubaiy 5CDEFG, Saeed M. Alqahtani 5ACDEF, Nagam Mohammed Mohsen 6CDEG, Mohammed H.D. Al Wadei 7CDEG, Khurshid Mattoo 1ACDEFDOI: 10.12659/MSM.944502
Med Sci Monit In Press; DOI: 10.12659/MSM.944502
Available online: 2024-04-26, In Press, Corrected Proof
Publication in the "In-Press" formula aims at speeding up the public availability of the pending manuscript while waiting for the final publication. The assigned DOI number is active and citable. The availability of the article in the Medline, PubMed and PMC databases as well as Web of Science will be obtained after the final publication according to the journal schedule
Abstract
BACKGROUND
Before insertion, chairside adjustment kits are heat sterilized for positioning and polishing dental restorations. This study aimed to evaluate the effects of 2 steam sterilization cycles on the efficacy of polishing highly translucent monolithic zirconia (HTMLZ) dental restoration material.
MATERIAL AND METHODS
100 HTMLZ disc-shaped specimens were adjusted (grinding, finishing, polishing) with EVE Diacera kit. Two steam sterilization techniques [standard (Gp S), immediate/flash (Gp (F)] of CAK were further subgrouped based on number of sterilization cycles [cycle 1 (control), cycle 5, 10, 15, and 20 (experimental)] (n=10 each). Each subgroup accordingly was evaluated for average surface roughness (Ra) and root mean square roughness (Rq) using a profilometer. Mean and standard deviation of 5 subgroups were statistically analyzed using one-way ANOVA/post hoc Tukey’s test. Scanning electron microscopy complemented Ra, Rq measurements. Statistical differences of P≤0.05 were considered significant.
RESULTS
HTMLZ specimens in both groups showed increased (Ra/Rq) values after repeated sterilization of EVE Diacera kit, with Gp F showing lesser increase than Gp S (20 cycles). Gp F at 10 cycles and Gp S at 15 cycles showed clinically unacceptable roughness threshold (0.25 μm). Differences between subgroups for Ra and Rq values were significant (P≤0.05) with less differences within groups observed in early cycles (1, 10). Results validate the manufacturer’s recommendations of using flash sterilization/10 cycles for EVE Diacera kit.
CONCLUSIONS
Repeated sterilization reduces efficacy of chairside adjustment kit to produce smooth surfaces on HTMLZ. This study recommends flash sterilization to a maximum of 10 times to get the clinically acceptable results of Ra and Rq.
Keywords: Denture, Partial, Fixed; Disinfection; Steam; Sterilization; Yttria Stabilized Tetragonal Zirconia
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