Interproximal space recovery using an orthodontic elastic separator before prosthetic restoration: a case report

The presence of a dental contact point is essential to maintain normal occlusion and to preserve the health of periodontal structures. Occasionally dental caries could compromise the interproximal contact point, leading to migration of the adjacent teeth with consequent retention of food, gingival inflammation, pocket formation, bone loss and dental mobility. In order to achieve an adequate restorative treatment, reestablishment of interproximal space is necessary. This report describes the interproximal space recovery between the maxillary first and second molars of a 45-year-old female patient before tooth reconstruction. In this case, an orthodontic elastic separator was indicated as an alternative to fixed orthodontic appliances in order to recover the necessary space. The technique was proven efficient, effective, economical, easy to perform and, above all, less invasive than other methods. The interproximal space was regained and a ceramic onlay was cemented for restoring the maxillary second molar. Periodical clinical and radiographic follow-up should be maintained to ensure long-term success.A presença dos pontos de contato dentais é essencial para a manutenção da oclusão habitual e da saúde das estruturas periodontais. Ocasionalmente as cáries dentárias podem comprometer o ponto de contato interproximal, induzindo a migração de dentes adjacentes com conseqüente retenção de alimento, inflamação gengival, formação de bolsa periodontal, perda óssea e mobilidade dental. A fim de realizar um tratamento restaurador adequado, o restabelecimento do espaço interproximal é necessário. O presente relato descreve a recuperação do espaço interproximal entre molares de uma paciente de 45 anos de idade antes da reconstrução dentária. Neste caso, um elástico ortodôntico separador foi indicado como alternativa aos dispositivos ortodônticos fixos no restabelecimento do espaço necessário. A técnica utilizada provou ser eficiente, efetiva e econômica, e principalmente menos invasiva e fácil de ser realizada. Contudo para que o sucesso clínico se estabeleça ao longo do tempo, faz-se necessário um controle clínico e radiográfico

Effect Of Sodium Hypochlorite And Peracetic Acid On The Surface Roughness Of Acrylic Resin Polymerized By Heated Water For Short And Long Cycles.

To evaluate the surface roughness of acrylic resin submitted to chemical disinfection via 1% sodium hypochlorite (NaClO) or 1% peracetic acid (C2H4O3). The disc-shaped resin specimens (30 mm diameter ×4 mm height) were polymerized by heated water using two cycles (short cycle: 1 h at 74°C and 30 min at 100°C; conventional long cycle: 9 h at 74°C). The release of substances by these specimens in water solution was also quantified. Specimens were fabricated, divided into four groups (n = 10) depending on the polymerization time and disinfectant. After polishing, the specimens were stored in distilled deionized water. Specimens were immersed in 1% NaClO or 1% C2H4O3 for 30 min, and then were immersed in distilled deionized water for 20 min. The release of C2H4O3 and NaClO was measured via visual colorimetric analysis. Roughness was measured before and after disinfection. Roughness data were subjected to two-way ANOVA and Tukey's test. There was no interaction between polymerization time and disinfectant in influencing the average surface roughness (Ra, P = 0.957). Considering these factors independently, there were significant differences between short and conventional long cycles (P = 0.012), but no significant difference between the disinfectants hypochlorite and C2H4O3 (P = 0.366). Visual colorimetric analysis did not detect release of substances. It was concluded that there was the difference in surface roughness between short and conventional long cycles, and disinfection at acrylic resins polymerized by heated water using a short cycle modified the properties of roughness.8533-

Effect of different surface penetrating sealants on the roughness of a nanofiller composite resin

This study evaluated the effectiveness of different sealants applied to a nanofiller composite resin. Forty specimens of Filtek Z-350 were obtained after inserting the material in a 6x3 mm stainless steel mold followed by light activation for 20 s. The groups were divided (n=10) according to the surface treatment applied: Control group (no surface treatment), Fortify, Fortify Plus and Biscover LV. The specimens were subjected to simulated toothbrushing using a 200 g load and 250 strokes/min to simulate 1 week, 1, 3 and 6 months and 1 and 3 years in the mouth, considering 10,000 cycles equivalent to 1 year of toothbrushing. Oral-B soft-bristle-tip toothbrush heads and Colgate Total dentifrice at a 1:2 water-dilution were used. After each simulated time, surface roughness was assessed in random triplicate readings. The data were submitted to two-way ANOVA and Tukey's test at a 95% confidence level. The specimens were observed under scanning electron microscopy (SEM) after each toothbrushing cycle. The control group was not significantly different (p&gt;0.05) from the other groups, except for Fortify Plus (p<0.05), which was rougher. No significant differences (p&gt;0.05) were observed at the 1-month assessment between the experimental and control groups. Fortify and Fortify Plus presented a rougher surface over time, differing from the baseline (p<0.05). Biscover LV did not differ (p&gt;0.05) from the baseline at any time. None of the experimental groups showed a significantly better performance (p&gt;0.05) than the control group at any time. SEM confirmed the differences found during the roughness testing. Surface penetrating sealants did not improve the roughness of nanofiller composite resin

Verificação da capacidade antibacteriana e antifúngica de nanopartículas de prata incorporadas a gessos odontológicos / Verification of the antibacterial and antifungal capacity of silver nanoparticles incorporated to dental plasters

A manutenção da cadeia asséptica em consultório odontológico requer atenção a vários detalhes técnicos, que incluem a higienização das mãos, a desinfecção de superfícies e artigos, a esterilização de artigos, a desinfecção de moldes e modelos de gesso. Vários trabalhos já comprovaram a contaminação em gessos odontológicos. Embora existam protocolos para a desinfecção de modelos de gesso, poucos profissionais costumam realizá-los com regularidade, o que reforça a importância da incorporação de agentes antimicrobianos ao material. Nanopartículas de prata (AgNPs) vêm sendo utilizadas como agente antimicrobiano com sucesso na medicina e em outros setores, como o têxtil. O objetivo deste trabalho foi verificar o potencial antibacteriano e antifúngico das AgNPs incorporadas a gessos odontológicos. Para tanto, foram confeccionados discos de gesso tipo III e tipo IV aos quais foram incorporadas nanopartículas de prata nas concentrações de 50, 100, 200 e 300 ppm. Como controle negativo foram confeccionados discos de gesso sem as nanopartículas e, como controle positivo, foram confeccionados discos de gesso sem as nanopartículas, mas que foram submetidos ao contato com glutaraldeído 2% e hipoclorito de sódio 1%. Os discos de gesso foram dispostos em uma placa de Petri, com meio de cultura Muller Hinton e Sabouraud, para verificar o potencial para inibição de Staphylococcus aureus, Escheridia coli, Streptococcus mutans e Candida albicans. Foi feita a verificação do poder antimicrobiano de cada uma das substâncias através da medida dos halos de inibição de crescimento microbiano. Nenhuma das substâncias testadas foi eficaz em prevenir o crescimento microbiano. Outras alternativas precisam ser incorporadas à rotina odontológica

Comparison of frictional resistance between self-ligating and conventional brackets tied with elastomeric and metal ligature in orthodontic archwires

OBJECTIVE: To compare the frictional resistance between self-ligating and conventional brackets tied to different types of wire. MATERIAL AND METHODS : Abzil Kirium Capelozza (Pattern I) and Easy Clip (Roth prescription) incisor brackets were used. An elastomeric ligature or a ligating wire 0.10-in was used to ligate the wire to the Abzil bracket. Three types of orthodontic archwire alloys were assessed: 0.016-in NiTi wire, 0.016 x 0.021-in NiTi wire and 0.019 x 0.025-in steel wire. Ten observations were carried out for each bracket-archwire angulation combination. Brackets were mounted in a special appliance, positioned at 90 degrees in relation to the wire and tested in two angulations. Frictional test was performed in a Universal Testing Machine at 5 mm/min and 10 mm of displacement. The means (MPa) were submitted to ANOVA and Tukey's test set at 5% of significance. The surfaces of wires and brackets were observed at SEM. RESULTS: Steel-tied brackets (16.48 ± 8.31) showed higher means of frictional resistance than elastomeric-tied brackets (4.29 ± 2.16 ) and self-ligating brackets (1.66 ± 1.57) (P 0.05). No statistical differences (P > 0.05) were found between zero (7.76 ± 8.46) and five-degree (7.19 ± 7.93) angulations. CONCLUSIONS: Friction was influenced not only by the type of bracket, but also by the ligating systems. Different morphological aspects were observed for the brackets and wires studie