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Objectives: To compare the effect of bleaching agents based on carbamide peroxide in different concentrations on the microhardness of bovine enamel. Material and Methods: In vitro study. 60 samples of bovine enamel were used, divided into two groups according to the assigned agent: carbamide peroxide (Opaslescense PF, Ultradent), at 35% and 15%. Next, the bleaching agent was applied to the samples, according to the manufacturer's instructions. The surface microhardness of enamel was evaluated by Vickers microhardness test, before and after application of the bleaching agent. The relationship between variables was evaluated using Student's t-test. Results: The study found no significant differences between the microhardness groups treated with 15% and 35% carbamide peroxide, both at the beginning and after the application of the bleaching agent (p:0.160 and p:0.584 respectively). However, when considering the concentrations separately, both bleaching agents caused a decrease in the microhardness of the enamel (p<0.001 in both cases). Conclusions: Both bleaching agents caused a decrease in the superficial microhardness of the enamel, the effect was similar for both concentrations. [ABSTRACT FROM AUTHOR]

Copyright of Avances en Odontoestomatologia is the property of Ediciones Avances SL and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Tooth color change is an alteration that varies in cause, location and severity, which may be related to extrinsic factors, intrinsic factors or a combination of both; For this reason, dental whitening is one of the procedures most requested from dentists; more and more patients are looking for a better image and smile without considering the possible consequences. This is due to the constant advertising in the media; in addition, it has led to the appearance of certain products on the market that are used by consumers without any control from the dentist. Therefore, the objective of this review is to know the advantages and disadvantages of dental whitening with 35% hydrogen peroxide (PH) (ultradent) in the office and 10% carbamide peroxide (PC) (ultradent) for home use, with the aim of in order to guarantee the comfort of patients during use and to avoid possible adverse effects. The academic Google search engine was reviewed, as well as databases: PubMed, SciELO, Medigraphic and ScienceDirect, in the period 2002 to 2020, using as keywords "hydrogen peroxide", "carbamide peroxide", "whitening", "clarification", "ph" and their similar in English. Two hundred fifty-four articles were obtained, of which 50 were selected and analyzed because they were related to the topic raised. It is concluded that, according to the instructions specified by the manufacturer, PH 35% and PC 10% are reliable agents for dentistry. [ABSTRACT FROM AUTHOR]

Copyright of Revista de la Asociación Odontológica Argentina is the property of Asociacion Odontologica Argentina and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Revista ADM is the property of Asociacion Dental Mexicana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The dental bleaching is a procedure that provides good clinical results, but sometimes there is a need to combine the bleaching with other procedures in order to optimize the results such as the use of composite restorations. The present case report describes the application of the dental bleaching procedures by carbamide peroxide 16% and direct restorations with composite resin in the resolution of a clinical case. The aim was to describe correctly the bleaching technique using trays combined with the application of composite resins in a clear and simple way. The result was satisfactory for the patient since it was possible to bleach the teeth and improve their shape, returning to a color more suitable for the patient's age. It is possible to conclude that the proper managing of the dental bleach combined with the direct restorations of composite resin offering a safe and effective alternative. [ABSTRACT FROM AUTHOR]

Objective. To evaluate the microfiltration in cavities class I, filled with composed resin Filtec 250 3M after the use of teeth bleaching agents (with hydrogen peroxide and carbamide peroxide). Material and Method. 60 cavities class I were prepared in human teeth extracted with orthodontic purposes. They were distributed randomly in three (03) groups (n=20). Group 1: after the restoration was done, this group was submitted to bleaching with peroxide of hydrogen (Pola Office) group 2: after the restoration was done, this group was submitted to bleaching with peroxide of carbamide (night withe), and group 3 was the control. The three groups were placed in artificial saliva at 37°C for 24 hours and later were introduced in blue of methylene for 30 minutes and immediately they were washed with distilled water. Then mesiodistal planes were done to each of the dental pieces. For the comparison of the microfiltration student t test was used. The data processing was done at a 95% confidence level and with a 5% margin of error. Results. Marginal microfiltration statistically significant was found in regard to the control group in groups 1 and 2 (peroxide of hydrogen and peroxide of carbamide). In addition, it was observed major microfiltration in group 2 (peroxide of carbamide) but this one did not have a statistically significant difference in regard to group 1 (peroxide of hydrogen). Conclusions. It was found statistically significant microfiltration in the specimens submitted to dental bleaching. (Kiru 2011, 8: 59-62) [ABSTRACT FROM AUTHOR]

Copyright of Revista Odontología Vital is the property of Universidad Latina de Costa Rica and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: The purpose of this in vitro study was to determine if the adhesion of the Streptococcus mutans to the dental surface is increased by the use of bleaching agents in these teeth. Material and Method: There were used 30 upper first premolars with no signs of fractures or cavity lesions. grouped in tree ones: Pieces Treated with Carbamide Peroxide to 22% during 4 hours per day during 9 days, pieces treated with hydrogen peroxide to 7,5% during 1 hour for 9 days (following the producer instructions) and a control groups; pieces treated without a bleaching agent. Them the teeth were placed with the vestibular part in contact with the culture plates of Streptococcus mutans and were exposed for 24 hours. The number of adherence colonies to the dental surface was given by bacteriological tests. Results: There were not found significative difference between the avarage of adherence of units that formed colonies of the group submited to both bleaching agents and the control group. Conclusion: The final conclusion was that the use of bleaching agents on enamel surface increases the susceptibility of it to be colonized by Streptococcus mutans, without a difference between the effects of the 22% carbamide peroxide and the 7,5% hydrogen peroxide. [ABSTRACT FROM AUTHOR]