ABSTRACT
OBJECTIVES: To evaluate the volume and depth of enamel loss promoted by 37.5% and 7.5% hydrogen peroxide (HP) gels, and quantify the loss of calcium (Ca) and phosphate (P) ions by using ion chromatography (IC) analysis after bleaching. METHODS: Sixty bovine enamel specimens were randomly divided into three groups: Control - no bleaching gel; HP37.5%, application of HP 37.5% for 45 minutes for 14 days; and HP7.5%, application of HP 7.5% for 3 applications of 8 minutes. The surface analysis (n=5) was performed using a scanning electron microscope (SEM) and dispersive energy system (EDS) to calcium and phosphorus dosage. The micro-CT was used for the enamel loss analysis (n=5). IC was used to analyze extracted Ca and P (n=10). Data were analyzed by one-way ANOVA and two-way repeated measures ANOVA, followed by Tukey and Dunnett's tests (α=0.05). RESULTS: Significantly higher volume and depth of enamel loss were found for bleached groups compared with the control group. HP7.5% had significantly higher enamel change than HP37.5%. SEM showed higher enamel porosity for HP37.5% and HP7.5% compared to control. The IC demonstrated a significant increase of Ca incorporated into the gel, however, only HP7.5% had a higher P presence than the control group. The HP7.5% showed higher Ca and P ion exchange than HP37.5% (p<0.001). CONCLUSION: HP37.5% and HP7.5%, caused enamel mineral changes compared with the control group. The IC method was demonstrated to be an effective methodology for detecting enamel mineral loss by the bleaching gel.
Subject(s)
Tooth Bleaching Agents , Tooth Bleaching , Animals , Cattle , Calcium , Tooth Bleaching/methods , Dental Enamel , X-Ray Microtomography , Hydrogen Peroxide/chemistry , Minerals , Phosphates , GelsABSTRACT
A prótese total sobre implantes é uma alternativa para pacientes totalmente edêntulos com rebordo ósseo que não proporciona retenção e nem estabilidade para uma prótese total convencional. A prótese implanto-suportada e implanto-retida é o tipo de prótese que os pacientes têm maior preferência, sendo uma das melhores formas de reabilitação para pacientes desdentados total, reestabelece a função mastigatória, deglutição e também a capacidade fonética, trazendo maior conforto e segurança para o paciente resultando em melhor qualidade de vida. O objetivo deste trabalho é mostrar uma técnica alternativa para reabilitação total superior com prótese total implanto-suportada cerâmica com infraestrutura de zircônia.
The total prosthetic implant is an alternative to edentulous patients with bone edge which does not provide retention and stability or for a conventional denture. The implant-supported and implant-retained prosthesis is the type of prosthesis that patients have more preferably, one of the best forms of rehabilitation for full edentulous patients, restores chewing, swallowing and also the phonetic capacity, providing greater comfort and safety to the patient resulting in improved quality of life. The objective of this work is to show an alternative technique for maxillary complete rehabilitation with implant-supported denture with ceramic zirconia infrastructure.