This study evaluated the degree of conversion (DC) four indirect resin composites (IRCs) with various compositions processed in different polymerization units and investigated effect thermal aging on flexural strength Vicker's microhardness.Specimens were prepared from IRC materials, namely Gr 1: Resilab (Wilcos); Gr2: Sinfony (3M ESPE); Gr3: VITA VMLC (VITA Zahnfabrik); Gr4: Zeta Zahnfabrik) using special molds for test (N = 80, n 10 per group) (25 x 2 mm(3), ISO 4049), microhardness (5 4...

High concentrations of hydrogen peroxide can cause adverse effects on composition and structure teeth. However, the addition calcium fluoride in bleaching agents may reduce enamel demineralization. Objective: To evaluate chemical changes sound demineralized enamels submitted to high containing (F) or (Ca). Material Methods: Enamel blocks bovine incisors with standard dimensions were obtained half them pH-cycling promote initial caries lesions. Sound samples divided into (n=10): (C) Control...

The present study aimed to determine if the addition of fluoride (F) and calcium (Ca) home-applied 10% carbamide peroxide (CP) bleaching agents reduces mineral loss on enamel surface subsurface.Home-applied effectively whitens teeth. However, possibly promotes adverse side effects such as tooth hypersensitivity morphological chemical alterations, reductions in fluoride, that affect surface.Sixty human slabs were selected based evaluation their microhardness (n = 10) submitted application...

Studies have shown that enamel can be modified by pulsed CO2 laser to form a more acid-resistant substrate. This study evaluated the effects of 10.6-μm on surface morphology and chemical composition as well monitored intrapulpal temperature changes during irradiation. Human teeth were irradiated with fluences 1.5-11.5 J/ cm2, pulpal thermal morphological modifications assessed. The submitted pH-cycling model, mineral loss was determined means cross-sectional microhardness. For all groups,...

This in vitro study aimed at evaluating the efficacy of a CO(2) laser (10.6 microm) alone or combined with acidulated phosphate fluoride (APF) on inhibition lesion progression primary enamel. The specimens were treated with/without and/or APF and submitted to pH cycling. Microhardness analysis was performed enamel mineral loss values obtained. groups presented lower when compared control group (p < 0.05). Laser irradiation decreased However, treatment did not show any significant additional effect.

Clinical Relevance Photo-polymerization using second generation LED and halogen light in the soft-start mode of curing was able to produce an adequate degree conversion resin composites. The lower produced by low power could lead restoration failure, degradation organic matrix recurrent caries.

The objective of this study was to evaluate the effects combined use light irradiation (LIR, halogen light, or LED/diode laser) and 35% hydrogen peroxide (35%HP) on human enamel mineral content.The high-intensity has been indicated for acceleration rate chemical bleaching; however, it is not known whether LIR can promote additional surfaces during bleaching.One hundred samples were obtained from third molars randomly divided into 10 groups (n = 10). control group (CG) remained untreated....

The aim of this study was to observe the influence two light polymerization units (LED or halogen light) on degree conversion (DC) three dental composites with lighter shades and a different photoinitiator system. top (T) bottom (B) surfaces 60 discs composite resin (Filtek™ Supreme, Filtek™ Z250, Tetric™ Ceram Bleach) cured either by LED lamp (HL) were studied using an FT-Raman spectrometer. evaluated following changes in intensity methacrylate C=C stretching mode at 1640 cm-1. calculated...

We examine the morphological and chemical changes in pulp chamber dentin after using endodontic agents by scanning electron microscopy (SEM), Fourier transform Raman spectroscopy (FT-Raman), micro energy-dispersive x-ray fluorescence spectrometry (μEDXRF). Thirty teeth were sectioned exposing divided six groups (n = 5): NT-no treatment; CHX-2% chlorhexidine; CHXE-2% chlorhexidine+17% EDTA; E-17% SH5-5.25% NaOCl; SH5E-5.25% NaOCl+17% EDTA. The inorganic organic content was analyzed FT-Raman....

The effects of fluoride treatment on bovine enamel subjected to acid erosion were studied by roughness (Ra) measurements, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and microenergy-dispersive X-ray fluorescence spectrometry (μ-EDXRF).Enamel samples (63) divided into nine groups (n = 7): artificial saliva (AS), Pepsi Twist(®) (PT), orange juice (OJ), Duraphat(®) + (DPH/PT), (DPH/OJ), Duofluorid(®) (DUO/PT), (DUO/OJ), gel (FG/PT), (FG/OJ). Fluoride was applied...

The radiotherapy can directly affect the bond strength of adhesive materials, interfering in prognosis restorative treatments, which may be caused by chemical changes dentin structure.Twenty inferior homologues premolars were distributed 2 groups (in vitro study) (n = 10): nonirradiated and irradiated. specimens submitted to analysis phosphate (ν1 PO43- ;ν2 ;ν4 ), carbonate (ν3 CO32- amide I, CH2 , III, I/III ratio confocal Raman spectroscopy. Data statistical (T test, P < .05).In intracanal...

Abstract Background: Dental erosion is a risk factor for dental health, introduced by today's lifestyle. Topical fluoride applications in the form of varnishes and gel may lead to deposition on enamel. Purpose: This vitro study aimed evaluate effect two one dissolution bovine enamel acids. Methods: Enamel samples (72) were divided ( n = 8): artificial saliva (control‐G1), Pepsi Twist® (G2), orange juice (G3), Duraphat® + (G4), (G5), Duofluorid® (G6), (G7), (G8), (G9). Fluoride was applied 4...

The purpose of this study was to assess the hardness, mineral content, surface roughness, and micromorphology sound slightly demineralized enamels, before after bleaching procedure using 10% carbamide peroxide.Sixty bovine dental blocks were randomly divided into following two groups: 30 slabs submitted three cycles pH noncycled. Hardness (n=10) measured microhardness tester with Knoop indenter under a 50 g load for 5 seconds. calcium/phosphate (Ca/P) ratio obtained micro-energy-dispersive...

The aim of this FT-Raman study was to investigate laser-induced compositional changes in enamel after therapy with a low-level infrared diode laser and photoabsorbing cream, order intensify the superficial light absorption before cariogenic challenge.Dental caries remains most prevalent disease during childhood adolescence. Preventive modalities include use fluoride, reduction dietary refined carbohydrates, plaque removal oral hygiene techniques, antimicrobial prescriptions. A relatively...

The effects of laser etching, decontamination, and storage treatments on dentin components were studied by energy-dispersive X-ray fluorescence spectrometry (EDXRF). Thirty bovine incisors prepared to expose the surface then divided into two main groups based upon decontamination process procedure: autoclaved (group A, n=15) or stored in aqueous thymol solution B, n=15). surfaces slices schematically four areas, with each one corresponding a treatment subgroup. specimens either etched...

Objective: This study aimed to investigate the effects on enamel surface treated with hydrogen peroxide bleaching and acidic soft drink immersion and/or brushing whitening dentifrices. Materials Methods: Fifty-six standardized slabs obtained from labial surfaces of bovine incisors were used. Enamel ground flat, polished, randomly assigned one seven treatment groups: (1) control, in which no was performed, (2) immersion, (3) 38% bleaching, (4) simulated toothbrushing dentifrice, (5) (6)...

The aim of this study was to investigate the effects some acidic drinks on dentin erosion, using methods surface profile (SP) analysis and energy-dispersive X-ray fluorescence spectrometry (EDXRF). One hundred standardized slabs obtained from bovine incisor roots were used. Dentin measuring 5x5 mm ground flat, polished half each specimen protected with nail polish. For 60 min, surfaces immersed in 50 mL 5 different (Gatorade®, Del Valle Mais orange juice®, Coca-Cola®, Red Bull® white wine),...

Abstract Purpose: This work aims to study the erosion on restorative materials and surrounding dentin. Fifty root dentin samples were obtained from bovine incisors. Methods: Twenty not restored thirty received cavity preparations. Samples assigned five groups: G1, G2: sound (D); G3: composite resin (CR); G4: resin‐modified glass‐ionomer cement (RMGIC); G5: (GIC). The of groups 2–5 submitted six cycles (demineralization–remineralization). analyzed by micro energy‐dispersive X‐ray fluorescence...

This study evaluated structural and molecular issues of dentin caries-like lesions produced by different artificial models (ACL) compared with natural caries (NCL). One hundred twenty-four sound occlusal blocks 47 carious were obtained surface hardness was analyzed (SH1). They assigned to groups according ACL: GB: Biological; GC: Chemical; GIS: In situ; GNC: (control). Blocks from 1, 2 3 submitted lesion induction. NCL ACL (SH 2), FT-Raman µEDXRF analysis. All longitudinally sectioned one...

AIM: To evaluate the effects of three hydrogen peroxide (HP) concentrations on enamel mineral content (MC), following applications and using methods to measure MC. METHODS : Forty samples were obtained from bovine incisors randomly divided into 4 groups (n=10). The control group remained untreated, while experimental tested for HP (10%, 35% 50%). gel was applied 3 times surface 30 min per application analyzed after each application. MC determined before bleaching Fourier transform (FT-Raman)...