This work aimed to evaluate the roughness, microhardness, ultrastructure, chemical composition and crystalline structure in submitted teeth a prolonged home bleaching regimen with 10% carbamide peroxide (10% PC) for different periods. The specimens were divided into following groups: G1: negative control (application of water-soluble gel); G2: tooth whitening group (positive control), under application time recommended by manufacturer (4h/14 days); G3: 50%, 50% (4h/21 G4: excessive 100%,...

The aim of this study was to evaluate the influence an extended use desensitizing toothpastes (DTs) on dentin bonding, microhardness and roughness. One hundred twenty bovine incisor teeth were randomly divided into four groups: G1, distilled water (WATER); G2, Colgate Total 12 (CT12); G3, Sensitive Pro-Relief (CSPR); G4, Sensodyne Repair ?αμπ; Protect (SRP). Dentin surfaces etched with 17% EDTA 2 years simulated tooth brushing (20,000 cycles) performed their surfaces. Knoop microhardness,...

The objective evaluate was the influence of prolonged tooth bleaching with 10 % carbamide peroxide (10CP) on enamel mass variation. Ten healthy bovine incisor teeth were divided (n = 5) into G1 - storage in distilled water and G2 artificial saliva. samples weighed an electronic analytical balance at following times: T0 before application gel, T1 after 14 days (the time recommended by manufacturer), T2 21 (50 increase T3 28 (100 manufacturer). data subjected to ANOVA for related (p 0.05)....

Garbin CA, Spazzin AO, Meira‐Júnior AD, Loretto SC, Lyra AMVC, Braz R. Biomechanical behaviour of a fractured maxillary incisor restored with direct composite resin only or different post systems. International Endodontic Journal . Abstract Aim To compare stress distribution between central (CR) associated materials, using finite element analysis. Methodology A three‐dimensional model sound and supporting structures was constructed, data from the dental literature. Changes were made in crown...

Background: Dental bleaching has been increasingly sought out to improve dental aesthetics, but it may cause changes in enamel. Objective: To assess the influence of different time intervals on gel applications with regard Microhardness (MH) and Surface Roughness (SR) Material Methods: Forty bovine incisors were randomly divided into two groups (G1 G2) both bleached 35% Hydrogen Peroxide (HP35) (n=20; G1: seven-day interval G2: two-day interval). The MH SR tests performed before (T0) after...

This study aimed to evaluate the effects of 22% carbamide peroxide combined with an erosive challenge and simulated brushing on enamel. Bovine incisor teeth were divided into G1, tooth bleaching; G2, bleaching + challenge; G3, brushing, evaluated at T0, before any intervention; T1, 14 days after proposed treatments; T2, 28 treatments. Tooth was performed daily for 1 h days. The microhardness, surface roughness, mass variation, ultrastructure analyzed T2. Two-way analysis variance repeated...

The objective of this randomized clinical trial was to evaluate the performance adhesive restorations using a three-step etch-and-rinse (TSER), one-step self-etching (OSSE), and simplified ethanol-wet bonding technique (EWBT) prior application composite resin in non-carious cervical lesions. Ninety-three (31 for each group) were placed 17 patients by single operator. No cavity preparation performed. After 6 12 months, assessed two previously trained examiners modified Ryge criteria retention...

The objective of this in vitro study was to assess the influence prolonged bleaching pre- and postrestoration on bond strength (microshear) enamel using 4% hydrogen peroxide (PH4). In postrestorative bleached specimens evaluation, composite cylinders were assembled after bleaching, while prebleached specimens, before. Therefore, postbleached 60 bovine teeth randomly assigned as follows: G1: control; G2: 14 days before (BS) testing; G3: 21 days; G4: 28 days. 180 G5: storage artificial saliva...

This study evaluated the influence of 3 different photopolymerization sources on enamel shear bond strength after bleaching with 10% carbamide peroxide. Seventy-two incisive bovine teeth were randomly divided into 6 groups (n=12) according to treatment and source used: G1 - Bleached / Halogen lamp; G2 Not bleached lamp (control); G3 Light-emitting diodes (LED); G4 (LED) G5 Xenon plasma arc; G6 arc (control). Experimental exposed agent for a period 14 days, daily contact 4 h then stored in...

Aim: The study evaluated the influence of tucupi on enamel surface roughness, microhardness, ultramorphology, and mass variation. Materials Methods: Ninety healthy bovine incisors were divided into three experimental groups, according to acidic challenge adopted, being: G1- tucupi, G2- cola-based soft drink, G3-distilled water. properties (surface ultramorphology variation) all specimens at times T0 (before any intervention), T10 (10 days after proposed treatments), T20 (20 treatments) T30...

Aim: This study evaluated the stress distribution at bond interface during shear strength testing for three loading conditions. Methods: A three-dimensional model was created of a specimen evaluation by test, using cylindrical volumes representing dentin, adhesive system and composite resin. linear analysis performed to calculate dentin-adhesive interface. Three models simulating different conditions were prepared: chisel, orthodontic-looped wire stainless steel tape. Results: Chisel...

OBJECTIVE: To evaluate in vitro the effects of tooth whitening using gel with Amorphous Calcium Phosphate (ACP) on bond strength metal brackets. METHODS: Thirty-six bovine incisors were sectioned at crown-root interface, and crowns then placed PVC cylinders. The specimens divided into 3 groups (n = 12) according to treatment type used, as follows: G1 (control) no whitening; G2 not containing ACP (Whiteness Perfect - FGM), G3 (Nite White Discus Dental). Groups subjected 14 cycles followed by...

The aim of this in vitro study was to evaluate the effects sodium hypochlorite (NaOCl), ethylenediaminetetraacetic acid (EDTA), chlorhexidine (CHX) and hydroxyethylidene bisphosphonate (HEBP), also known as etidronate, on susceptibility root fracture resistance (RFR) human teeth subjected endodontic preparation.Seventy extracted single-rooted were selected, endodontically prepared using ProTaper Next rotary system (PTN, Dentsply, Maillefer, Ballaigues, Switzerland) then randomly divided...

Aims:To assess the influence of different bleaching protocols on bond strength to enamel. Materials and methods:In this laboratory experiment were used forty sound bovine incisors divided into five groups.G1: No (control).G2: 14 days with 4% hydrogen peroxide containing calcium (4% HP+Ca 2+ ) (2 hours/ day) 24 hours artificial saliva (AS) storage.G3: hours/day) 7 storage in AS.G4: 28 AS.G5: AS.Following times, composite resin cylinders built upon enamel surfaces tested for micros hearing.For...

Dentin hypersensitivity is a relatively common clinical condition, which affects large part of the world's population.The objective this study was to evaluate influence previous and prolonged treatment with desensitizing dentifrices (DD) on bond strength dentin, promoted by self-etching adhesive system.Seventy non-carious bovine incisors were used, divided into five groups (n= 14), according toothpaste such as, G1: distilled water (WATER) (control); G2: Colgate Total 12 (CT12) G3: Sensitive...

Aim: This study evaluated the effect of sodium ascorbate (SA) on proteolytic activity matrix metalloproteinases (MMPs) and investigated related effects bond strength bleached dentin. Materials methods: Eighty freshly extracted human third molars were randomly divided according to treatment (bleaching or SA application), type analysis (microshear measuring MMP activity), post-bleaching time assess (24 hrs 30 days). Data from both analyses subjected one-way variance detect differences among...

The objective of this study was to evaluate different delaying times after bleaching and the use sodium ascorbate (SA) concentrations (10% 35%) in bond strength adhesive cementation enamel. This used 54 sound bovine incisors, which were randomly assigned following groups: G1 (unbleached/control+ (AC)); G2 (bleached + AC 7 days); G3 10% SA 24 h); G4 G5 35% G6 days). After bleaching, G3, G4, G5, received an application before cylinders build up with RelyX Veneer cement. samples subjected...

INTRODUCTION: Dental bleaching is a conservative method for the aesthetic restoration of stained teeth. However, whitening treatments are likely to cause adverse effects when not well planned and executed. OBJECTIVE: This study evaluated influence gel on temperature rise in pulp chamber, using in-office photoactivated dental technique. MATERIAL AND METHOD: The root portion an upper central human incisor was sectioned 3mm below cemento-enamel junction. canal enlarged permit insertion K-type...

Objetivo : Avaliar a influencia do clareamento dental com peroxido de hidrogenio 35% (PH35), associado ao emprego fonte luminosa ativacao, na resistencia da uniao adesiva esmalte. Materiais e Metodos: Sessenta dentes bovinos incisivos higidos foram divididos em seis grupos (n=10) acordo realizacao tratamento clareador, fotoativacao gel tempo decorrido pos-clareamento para das unioes adesivas (24h ou 14d), sendo: G1 – Sem (controle) / 24h; G2 14d; G3 Clareamento G4 G5 Fotoativacao G6 14d. Os...

The scientific literature has studies that assess the influence of erosive challenges with citric acidic drinks and substances on adhesive bond strength to enamel dentin, but does not contain information about regional components an diet this process. Thus, study evaluated Amazonian tucupi dentin microshear strength.

Objective: To summarize and discuss the available information concerning effectiveness of sodium ascorbate in improving bond strength after dental bleaching procedures.Methods: Information original articles or reviews listed PubMed database using searching terms: (“sodium ascorbate” OR antioxidant) AND (bleaching hydrogen peroxide carbamide peroxide), were included review. Results: Most studies revealed that could restore altered redox potential oxidized bonding substrate, thus reversing...