Comparing coronal discoloration between AH26 and ZOE sealers

Intrinsic tooth discolorations after endodontic treatment are principally attributed to the composition of necrotic pulp tissue, hemorrhage within the pulp cavity, endodontic medicaments and/or filling materials. Residual sealer left in pulp chamber after obturation can cause discoloration. The objective of this in vitro study was to evaluate coronal discoloration created by AH26 and ZOE sealers after four months. Fifty intact human extracted maxillary central incisors were employed. Access cavities were prepared in all samples and root canals were instrumented; coronal orifices were then sealed using self-cure glass ionomer. The teeth were divided into two experimental groups [n=20] according to utilized sealer in pulp chambers including AH26 and Dorifill [ZOE]. The remaining 10 teeth served as negative and positive controls [n=5]. The access cavities were sealed with self-cure glass ionomer. Teeth were kept in incubator for four month. Preliminary digital images of the teeth were taken and then compared with those related to 4-month follow-up. The images were assessed using Photoshop software. Data was analyzed using paired t-test and independent samples t-test. The teeth which were filled with AH26 sealer showed significantly greater discoloration than those filled with ZOE sealer [Dorifill] [P<0.05]. AH26 sealer causes greater discoloration of the crown compared to ZOE sealer. Despite the other disadvantage of AH26 sealer, it seems that Dorifill is more esthetically considerate

Effect of silver leaf on circulating lipids and cardiac and hepatic enzymes.

About 50 mg of silver leaf (metallic silver) was given daily by mouth to 30 healthy volunteers for 20 days. A statistically significant hypophospholipidemic, hypotriglyceridemic, hypocholesterolemic and hypoglycemic effect was observed. This was accompanied by a less marked fall in total lipids and significant rise in HDL-cholesterol. In addition, a decrease in plasma enzymes - alkaline phosphatase (ALP), glutamate oxaloacetate transaminase (GOT), glutamate pyruvate transaminase (GPT), creatine phosphokinase (CPK), gamma glutamyl transpeptidase (GGT) and lactate dehydrogenase (LDH) was noted. This was statistically significant for all enzymes except CPK. The safety of ingested silver foil is indicated by absence of pathology in urine and unaltered levels of protein and albumin in the plasma. These observations suggest that silver could be beneficial in conditions like diabetes mellitus, obesity and atherosclerosis.

Avaliaçäo do comportamento do tecido conjuntivo de ratos a implantes de cones de prata submetidos à açäo de soluçöes irrigadoras / Evaluation of connective tissue reactions of rats from implants with silver cones submitted to the action of irrigators solutions

Neste estudo, foram avaliadas as reaçöes provocadas no tecido subcutâneo de ratos pela implantaçäo de cones de prata submetidos ou näo ao contato prévio com soluçöes irrigadoras de uso endodôntico. Segmentos de 1 cm de cones de prata foram implantados, sem prévio tratamento ou submetidos à açäo de soda clorada, "Endo-PTC" associado com liquído de Dakin e EDTA, em 24 animais, para análise histopatológica nos tempos de 7, 15, 30 e 60 dias. Os cones tratados com soda clorada provocaram as mais intensas reaçöes, com formaçäo de abscessos. Alteraçöes da estrutura dos cones de prata, pela açäo da soda clorada, favorecendo a sua corrosäo, bem como a provável interaçäo química entre a prata, o hipoclorito de sódio e os fluídos teciduais säo discutidos como possíveis causas da agressäo. Cuidados com a neutralizaçäo ou remoçäo de substâncias irrigadoras cloradas do interior do canal quando do uso de cones de prata como material obturador, säo recomendados