Dental erosion : an overview on definition and etiology, possible treatments and measurement wear erosive

Por muitos anos a erosão dentária foi uma condição que despertava pouco interesse de pesquisadores. Atualmente, observa-se que esta patologia tem sido uma das maiores causas de sensibilidade dentinária, estando relacionada, até mesmo, à degradação marginal de restaurações. A erosão é um processo multifatorial que envolve a desmineralização dental pela ação química de ácidos extrínsecos ou intrínsecos. Para o correto tratamento desta condição, o Cirurgião Dentista deve conhecer e aprender a distinguir os diferentes processos que resultam no desgaste dentário patológico. Sendo assim, para gerar um protocolo confiável é necessário o conhecimento sobre definição e etiologia da erosão dental, seus possíveis tratamentos e quanto aos recursos para mensuração de lesões erosivas.For many years dental erosion was a condition that aroused little interest from researchers. Currently, it is observed that this pathology has been a major cause of dentinal sensitivity, being related, even the marginal degradation of restorations. Erosion is a multifactorial process involving dental demineralization by the chemical action of extrinsic or intrinsic acids. For the correct treatment of this condition, the dentist should know and learn how to distinguish the different processes that result in pathological tooth wear. Thus, to generate a reliable protocol is necessary to know about definition and etiology of dental erosion, its possible treatments and the resources for measurement of erosive lesions.Fil: Ávila, Daniele Mara Da Silva. Universidad Estadual Paulista "Júlio de Mesquita Filho" (Brasil)Fil: Borges, Alessandra Buhler. Universidad Estadual Paulista "Júlio de Mesquita Filho" (Brasil)Fil: Poletto, Adriana . Universidad Nacional de Cuyo. Facultad de Odontologí

Anti-erosion potential of fluoride solutions associated with aminomethacrylate copolymer: in situ randomized crossover study

The anti-erosion potential of fluoride solutions associated with aminomethacrylate (AMC) was evaluated in the presence of acquired pellicle on enamel and dentin. It is concluded that AMC was able to increase the anti-erosion potential of fluoride solutions in the presence of acquired pellicle

S-PRG-based toothpastes compared to NaF toothpaste and NaF varnish on dentin permeability in vitro

Objectives: To analyze the effect of 5 toothpastes containing different percentages of S-PRG fillers compared to NaF toothpaste and NaF varnish on the dentin hydraulic conductance (Lp). Methodology: Dentin disks (1.0±0.2 mm thickness) were cut from third molars, and their Lp values were evaluated using Flodec. The specimens were allocated into 7 groups (n=8). The minimum (smear layer) and the maximum (after acid etching) Lp values were recorded. Lp was also assessed after treatment with either a 0wt.%, 1wt.%, 5wt.%, 20wt.%, or 30wt.% S-PRG toothpaste, a NaF toothpaste, or a NaF varnish. Toothpastes were applied by brushing for 15 s, allowing it to settle for 1 min, and rinsing with deionized water. The NaF varnish was applied for 4 min and was removed with a probe. Specimens were exposed to citric acid (6%, pH 2.1, 1 min) and their final Lp was recorded. The pH of all products was recorded (n=3) and specimens from each group were analyzed by Laser Scanning Confocal Microscopy (LSCM). Data were subjected to 2-way repeated measures ANOVA and post-hoc Bonferroni (a=0.05). Results: The highest Lp reduction was noticed for the 5wt.% S-PRG toothpaste, NaF toothpaste, and NaF varnish. However, the toothpastes containing 5wt.%, 20wt.%, and 30wt.% of S-PRG were similar to all toothpastes but differed from the NaF varnish. After erosion, all groups retrieved their maximum Lp values, except for the NaF varnish. The LSCM evidenced deposits on the surface of specimens treated with 5%, 20%, and 30% S-PRG-based toothpastes and NaF toothpaste. Even more deposits were observed for the NaF varnish. After the erosive challenge, the deposits were diminished in all groups. Conclusion: Toothpastes containing 5wt.%, 20wt.%, and 30wt.% of S-PRG fillers behaved similarly to a conventional NaF toothpaste, even after an erosive challenge. The NaF varnish promoted better reduction of the Lp, but its effect was also diminished after erosion

Influência de agentes clareadores na resistência de união de um sistema restaurador ao esmalte em função do tempo de armazenamento em saliva artificial

The aim of this study was to determine the effect of three bleaching agents on the shear bond strength of a composite resin to enamel, after various artificial saliva storage time (1 day, 1, 2 and 3 weeks). 78 human premolars were mesiodistally sectioned to obtain two halves. The buccal and lingual surfaces were ground with 600-grit aluminum oxide abrasiva paper to obtain flat enamel surfaces and divided into a control group (n=12) and three experimental groups (n=48), according to the bleaching agents. The first group was bleached with Crest Professional Whitestrips (6,5% hydrogen peroxide), used 1 hour for 14 days. The second group was bleached with Opalescence Quick (35% carbamide peroxide), in three applications of 1h, with an interval of 7 days among them. The third group was bleached with Opalescence Xtra (35% hydrogen peroxide), in three applications of 16min, with an interval of 7 days among them. Specimens of control group were not bleached and were stored in artificial saliva at 37ºC for 14 days. After the bleaching treatments, the specimens of the experimental groups were divided into four groups (n=12), according to the storage time in artificial saliva (1 day, 1, 2 and 3 weeks). Bonds were formed with Scotchbond MP and Z-100 composite resin, and shear bond test was carried out in an lnstron Universal Testing Machine after 24 hours. The results were analyzed by two-way ANOVA, Tukey and Dunnett's tests (5%). There was no significant difference among the shear bond strength of the three bleaching agents. Regarding to the post-bleaching time, the bond strength values obtained after three weeks were significant higher than the values obtained after one day, one and two weeks and were similar to those obtained for the control group. Conclusion: external bleaching with the three agents tested significantly reduced the bond strength of composite resin to enamel and after a lapse of ...O objetivo deste estudo foi determinar o efeito de três agentes clareadores na resistência de união de um sistema restaurador ao esmalte, após armazenamento em saliva artificial durante vários intervalos de tempo (um dia, uma, duas e três semanas). Foram utilizados 78 pré-molares humanos, seccionados no sentido mésio-distal para a obtenção de duas metades. As superfícies vestibulares e linguais foram planificadas com lixa de granulação 600 e divididas em um grupo controle (n=12) e três grupos experimentais (n=48), de acordo com o agente clareador utilizado. O grupo 1 foi clareado com Crest Professional Whitestrips (peróxido de hidrogênio a 6,5%), usado durante 14 dias em duas aplicações de 30min cada. O grupo 2 recebeu o agente clareador Opalescence Quick (peróxido de carbamida a 35%) em três aplicações de 1 h cada, com intervalo de sete dias entre estas. O grupo 3 foi clareado com Opalescence Xtra (peróxido de hidrogênio a 35%), em três aplicações de 16min cada, com intervalo de sete dias entre estas. Os espécimes do grupo controle permaneceram armazenados em saliva artificial a 37°C por 14 dias. Após os tratamentos clareadores, os espécimes dos três grupos experimentais foram divididos em quatro subgrupos (n=12), de acordo com o tempo de armazenamento em saliva artificial a 37ºC (um dia, uma, duas e três semanas). Após os períodos de tempo descritos, procedeu-se o condicionamento ácido do esmalte, aplicação do agente adesivo Scotchbond Multi-Uso Plus (3M) e confecção de um cilindro de resina composta Z100 (3M), com 2mm de diâmetro. Os espécimes foram submetidos ao ensaio de cisalhamento em máquina lnstron Universal após 24h para obtenção dos valores de resistência adesiva. Os resultados foram analisados pelos testes estatísticos de ANOVA dois fatores, Tukey e Dunnett (5%). Observou-se que não houve diferença significante entre os valores...

Effects of dental bleaching on the color, translucency and fluorescence properties of enamel and dentin

The objective of this study was to evaluate the color, translucency and fluorescence of bovine enamel and dentin submitted to different bleaching modalities. Pairs of enamel and dentin discs (3 mm in diameter) were obtained from 150 bovine teeth. In 75 of the pairs, one specimen had the enamel removed (Dentin Group). The dentin was removed from one specimen of the remaining 75 pairs (Enamel Group) and the other specimen was left unaltered (Enamel + Dentin). The evaluation of color, translucency and fluorescence was performed with a spectrophotometer using the CIE L* a* b*. Each group was subdivided into three subgroups: Control, composed of specimens that were not bleached, and two experimental subgroups, bleached with either 10% carbamide peroxide (CP10%) or 35% hydrogen peroxide (HP35%). The CP10% bleaching gel was applied 2 h/day for 14 days. The HP35% bleaching agent was applied using two applications of 30 min each, with a one week interval between each application. When not being bleached, the specimens were immersed in artificial saliva. The color, translucency and fluorescence ratings were assessed using spectrophotometry 7 days after the treatment. Regarding color, significant differences were found between bleaching techniques in the groups Enamel and Enamel + Dentin, with a higher color difference for HP35%. Bleaching did not change the translucency of the dental tissues. There were significant differences for fluorescence for the HP35% subgroups of Dentin and Enamel + Dentin, and for the CP10% subgroup of Enamel. Dental bleaching changed the color and fluorescence of the dental tissues, however translucency was not affected

Influence of Hydrogen Peroxide Bleaching Gels on Color, Opacity, and Fluorescence of Composite Resins

The aim of the present study was to evaluate the effect of 20% and 35% hydrogen peroxide bleaching gels on the color, opacity, and fluorescence of composite resins. Seven composite resin brands were tested and 30 specimens, 3-mm in diameter and 2-mm thick, of each material were fabricated, for a total of 210 specimens. The specimens of each tested material were divided into three subgroups (n=10) according to the bleaching therapy tested: 20% hydrogen peroxide gel, 35% hydroxide peroxide gel, and the control group. The baseline color, opacity, and fluorescence were assessed by spectrophotometry. Four 30-minute bleaching gel applications, two hours in total, were performed. The control group did not receive bleaching treatment and was stored in deionized water. Final assessments were performed, and data were analyzed by two-way analysis of variance and Tukey tests (p<0.05). Color changes were significant for different tested bleaching therapies (p<0.0001), with the greatest color change observed for 35% hydrogen peroxide gel. No difference in opacity was detected for all analyzed parameters. Fluorescence changes were influenced by composite resin brand (p<0.0001) and bleaching therapy (p=0.0016) used. No significant differences in fluorescence between different bleaching gel concentrations were detected by Tukey test. The greatest fluorescence alteration was detected on the brand Z350. It was concluded that 35% hydrogen peroxide bleaching gel generated the greatest color change among all evaluated materials. No statistical opacity changes were detected for all tested variables, and significant fluorescence changes were dependent on the material and bleaching therapy, regardless of the gel concentration