Abstract
ABSTRACT Objective: To evaluate whether two different bleaching gels affect the microhardness and surface roughness of feldspathic ceramic specimens, in vitro. Methods: A total of 48 feldspathic porcelain IPS In Line (Ivoclar-Vivadent) discs (16/treatment group) were immersed in distilled water (Group I, Untreated control, UN), or treated with the bleaching gels: Opalescence (15% carbamide peroxide; OPA) and Opalescence Xtra Boost (38%hydrogen peroxide; OPAXB), for 1h or 6h daily for 14 days. Surface roughness (Ra) and microhardness (Knoop, or KNP) measurements were made before and after treatment, and data were subjected to statistical analysis by paired Student’s t-test (p < 0.05). Results: Treatments using Opalescence and Opalescence Xtra Boost did not altered surface roughness (p=0.6199861) or microhardness (p=0.14286744) of the feldspathic porcelain tested in this study. Conclusion: Bleaching treatments using Opalescence and Opalescence Xtra Boost may be suitable for treatment in patients having ceramic prosthodontic treatment. Conclusion: Bleaching treatments using Opalescence and Opalescence Xtra Boost may be suitable for treatment in patients having ceramic prosthodontic treatment.
Highlights
Tooth bleaching is an effective and non-invasive aesthetic treatment that has become popular in dentistry, and can be performed either by dentists at dental offices, or by patients themselves at home [1,2,3,4]
Considering all the above mentioned, our focus was to evaluate whether two widely used tooth whitening gels Opalescence (15% carbamide peroxide) and Opalescence Xtra Boost (38% hydrogen peroxide) alters the surface roughness and microhardness of dental feldspathic ceramic (IPS In Line, from Ivoclar-Vivadent)
To mimic treatments performed in the clinic and at home, discs were treated with two different bleaching gels: for home use (Opalescence, 15% carbamide peroxide), and for professional use (Opalescence Xtra Boost, 38% hydrogen peroxide)
Summary
Tooth bleaching is an effective and non-invasive aesthetic treatment that has become popular in dentistry, and can be performed either by dentists at dental offices, or by patients themselves at home [1,2,3,4]. Tooth bleaching can be performed by long-term application of an oxidizing agent, such as a hydrogen peroxide or carbamide peroxide, at low concentrations. The direct contact with bleaching agents may cause undesirable changes (such as softening and degradation) to teeth and restorative materials [2,6]. Some studies reported negative effects of bleaching agents on chemical and physical properties of restorative materials [2,4,5,6,7,8,9,10,11,12,13], while others found only slight changes, or no significant alterations [14,15,16,17,18,19]. Possible negative effects of bleaching agents on restorative materials are relevant in clinical cases that have a restorative material for extended period, especially in areas that are not recommended to be replaced [1,2,3]
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