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article
Surface Roughness of Prefabricated Pediatric Zirconia Crowns Following Simulated Toothbrushing.
Abstract
<b>Purpose:</b> The purpose of this study was to evaluate the surface roughness of three different brands of prefabricated pediatric zirconia crowns (ZRCs) following simulated toothbrushing with a variety of dentifrices. <b>Methods:</b> Ninety-six total maxillary right central incisor prefabricated pediatric ZRCs (n equals 32 ZRCs/brand) were obtained from the manufacturers: Kinder Krowns<sup>®</sup>, NuSmile<sup>®</sup>, and Sprig<sup>®</sup>. ZRCs were equally assigned to dentifrices (n equals eight/dentifrice) with a variety of Relative Dentin Abrasion (RDA) values: Tom's of Maine Children's; Crest Kid's; Prevident 5000; and Crest<sup>®</sup> Pro-Health. ZRCs were brushed 10,000 strokes with a V-8 Toothbrushing Machine using the assigned dentifrices. Pre- and post-intervention data for the surface roughness of ZRCs, represented in Ra (average roughness) and Rz (mean roughness depth), were obtained using a stylus profilometer. Data were analyzed independently using two-way repeated measures analysis of variance with the Holm- Sidak method (α equals 0.05). <b>Results:</b> Baseline versus brushed Ra Kinder Krowns<sup>®</sup> with Prevident and Sprig<sup>®</sup> with Crest Kid's indicated statistically significant differences. Sprig<sup>®</sup> versus NuSmile<sup>®</sup> utilizing Crest Kid's were different in change in roughness. Both baseline and brushed NuSmile<sup>®</sup> dentifrice options were different versus all Sprig<sup>®</sup> and Kinder<sup>®</sup> ZRCs. <b>Conclusions:</b> Despite statistical significance, changes in surface roughness were small in scale. Although this study did not address toothbrushing and different dentifrices may affect the mechanical properties, durability, and/or retention properties of ZRCs, the study's results provide confidence to clinicians when using prefabricated pediatric ZRCs as a sustainable treatment option along with other restorative options, such as strip crowns and stainless steel crowns.