The aim of this study was to evaluate the influence of an extended use of desensitizing toothpastes (DTs) on dentin bonding, microhardness and roughness. One hundred and twenty bovine incisor teeth were randomly divided into four groups: G1, distilled water (WATER); G2, Colgate Total 12 (CT12); G3, Colgate Sensitive Pro-Relief (CSPR); and G4, Sensodyne Repair & Protect (SRP). Dentin surfaces were etched with 17% EDTA and 2 years of simulated tooth brushing (20,000 cycles) was performed on their surfaces. Knoop microhardness, surface roughness and scanning electron microscopy (SEM) were performed before and after the simulated tooth brushing. For microshear bonding test, a 2-step self-etching adhesive system (Clearfil SE Bond) was used and 0.8 mm diameter composite resin (Filtek Z350 XT) cylinders were built. Microshear test was performed with an orthodontic wire and with a crosshead speed of 0.5 mm/min. The data were analyzed for: 1) bond strength (one-way ANOVA), 2) microhardness intra-group (Student's test) and inter-group (one-way ANOVA/Tukey's test) comparisons, 3) roughness intra-group (Student's test/Wilcoxon's test) and inter-group (Kruskal-Wallis/Student-NewmanKeuls test) comparisons. The extended use of both dentifrices (conventional and for sensitive teeth) did not affect the bond strength and produced a significant increase in microhardness and roughness of the dentin, except for the microhardness of the SRP group. The simulated tooth brushing technique with water produced an increase in roughness, without reducing significantly the dentin microhardness.
Dentin hypersensitivity is a relatively common clinical condition, which affects a large part of the world's population. The objective of this study was to evaluate the influence of previous and prolonged treatment with desensitizing dentifrices (DD) on bond strength to dentin, promoted by a self-etching adhesive system. Seventy non-carious bovine incisors were used, and divided into five groups (n= 14), according to the desensitizing toothpaste used, such as, G1: distilled water (WATER) (control); G2: Colgate Total 12 (CT12) (control); G3: Colgate Sensitive Pro-Relief (CSPR); G4: Sensodyne Rapid Relief (SRR); G5: Sensodyne Repair & Protect (SRP). Teeth had their buccal surfaces flattened until the exposure of dentin, and fragments of 4x4x2 mm were obtained. Fragments were included in polyvinyl chloride (PVC) cylinders and exposed to 17 % EDTA for 1 min. Subsequently, specimens were submitted to 20 000 cycles of simulated dental toothbrushing. After 24 h in artificial saliva, specimens were hybridized (Clearfil SE Bond -Kuraray), as well as resin composite cylinders built on dentin surfaces. Samples were stored in distilled water, at 37 ºC for 24 h, and the shear bond strength was determined. The highest bond strength (MPa) value was seen in CT12 group (4.39), and the lowest one in CSPR group (3.34). Data were statistically analyzed by 1-way ANOVA (∂= 0.05), and results showed that there were no significant differences (p= 0.5986) considering the DD factor. The predominant fracture pattern was cohesive on dentin. The previous and prolonged use of different DD did not affect dentin bond strength promoted by a self-etching adhesive system.
Secondary caries is the primary cause of restoration failure. Thus, the development of adhesives with antimicrobial action is an advantageous option for their inhibition. However, this effect must be proven, as well as that the additional benefit does not interfere with material mechanical properties or biocompatibility. We analyzed adhesives with antimicrobial action by microbiological tests, bond strength, degree of conversion, and cytotoxicity. We analyzed 32 studies with commercially available antimicrobial adhesives (Clearfil™ SE Protect Bond/ MDPB, Gluma 2Bond/ glutaraldehyde, Peak Universal Bond/chlorhexidine), and experimental materials or commercial adhesives modified with antimicrobial agents, including materials with quaternary ammonium methacrylate (QAM) [dimethylaminododecyl methacrylate (DMADDM) and dimethylaminohexadecyl methacrylate (DMAHDM)], nanoparticles [silver (NAg), titanium dioxide (TiO2), zinc oxide (ZnO)], silver or zinc doped bioactive active glass (BAG), titanium, copper iodide, and compounds such as triclosan, quercetin, grape seed extract, among others. The use of antimicrobial agents is a favorable perspective for the functionalization of adhesive systems to inhibit secondary caries. However, more clinical studies need to prove the efficacy of these materials.
This study aims to evaluate the prevalence of tooth decay in the riverine population of Mamirauá Sustainable Development Reserve -MSDR, Amazonas, Brazil, as well as, to contribute to a better planning and implementation of public policies for oral health in those communities. The 2001 study examined 8 MSDR's communities with a population sample of 486 residents, between 1 and 70 years of age, divided into four age groups. For measuring the experience of tooth decay in permanent and deciduous teeth DMFT (decayed, lost and filled teeth) and deft indexes (decayed, extraction indicated and filled teeth) were used respectively. As a result, a 7.54 average DMFT and a 3.48 deft were observed. The age group with the fewest people free from tooth decay was that above 19 years, only 1.4% was free. And the largest component to the DMFT index contribution was loss by caries (68.90%), while decayed teeth for the deft index (90.54%). This data is disturbing concerning tooth decay in the communities of MSDR. The study stresses a need for a more effective public policies involving dental health for that population. RESUMOO objetivo deste trabalho foi avaliar a prevalência da doença cárie em uma população ribeirinha da Reserva de Desenvolvimento Sustentável Mamirauá -RDSM, Amazonas, Brasil, assim como contribuir para ações de planejamento e políticas públicas de saúde bucal nessas comunidades. A coleta dos dados foi feita em 2001 em oito comunidades da RDSM, com uma população amostral de 486 moradores, entre um a 70 anos de idade, divididos em quatro faixas etárias. Para medir a experiência de cárie na dentição permanente e decídua foram utilizados os índices CPO-D (dentes cariados, perdidos e obturados) e ceo-d (dentes cariados, extração indicada e obturados) respectivamente. Como resultado foi observada a média CPO-D de 7,54, e a de ceo-d 3,48. A faixa etária que apresentou o menor número de pessoas livres de cárie foi acima de 19 anos, onde apenas 1,4 % estavam livres da doença. O componente do CPO-D com maior percentual de ocorrência foi o perdido por cárie (68,90%), enquanto do índice ceo-d foi o componente cariado (90,54%) Esses dados são bastante preocupantes em relação à doença cárie nas comunidades da RDSM. O estudo ressalta a necessidade de políticas públicas de saúde bucal mais efetivas para essa população.estuarinas do ponto de vista de conservação de sua integridade ecológica e do aproveitamento dos recursos descartados, uma vez que este complexo estuarino está inserido na Reserva de Desenvolvimento Sustentável Caeté-Taperaçu.
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