ABSTRACT
OBJECTIVE: The purpose of this study was to evaluate, by shear bond strength (SBS) testing, the influence of different types of temporary cements on the final cementation using conventional and self-etching resin-based luting cements. Material and Methods: Forty human teeth divided in two halves were assigned to 8 groups (n=10): I and V (no temporary cementation); II and VI: Ca(OH)2-based cement; III and VII: zinc oxide (ZO)-based cement; IV and VIII: ZO-eugenol (ZOE)-based cement. Final cementation was done with RelyX ARC cement (groups I to IV) and RelyX Unicem cement (groups V to VIII). Data were analyzed statistically by ANOVA and Tukey's test at 5 percent significance level. RESULTS: Means were (MPa): I - 3.80 (±1.481); II - 5.24 (±2.297); III - 6.98 (±1.885); IV - 6.54 (±1.459); V - 5.22 (±2.465); VI - 4.48 (±1.705); VII - 6.29 (±2.280); VIII - 2.47 (±2.076). Comparison of the groups that had the same temporary cementation (Groups II and VI; III and VII; IV and VIII) showed statistically significant difference (p<0.001) only between Groups IV and VIII, in which ZOE-based cements were used. The use of either Ca(OH)2-based (Groups II and VI) or ZO-based (Groups III and VII) cements showed no statistically significant difference (p>0.05) for the different luting cements (RelyX TM ARC and RelyX TM Unicem). The groups that had no temporary cementation (Groups I and V) did not differ significantly from each other either (p>0.05). CONCLUSION: When temporary cementation was done with ZO- or ZOE-based cements and final cementation was done with RelyX ARC, there was an increase in the SBS compared to the control. In the groups cemented with RelyX Unicem, however, the use of a ZOE-based temporary cement affected negatively the SBS of the luting agent used for final cementation.
Subject(s)
Humans , Dental Bonding , Dental Cements/chemistry , Acid Etching, Dental , Aluminum Silicates/chemistry , Bisphenol A-Glycidyl Methacrylate/chemistry , Cementation , Calcium Hydroxide/chemistry , Dentin , Dental Porcelain/chemistry , Dental Stress Analysis/instrumentation , Eugenol/chemistry , Materials Testing , Polyethylene Glycols/chemistry , Polymethacrylic Acids/chemistry , Potassium Compounds/chemistry , Resin Cements/chemistry , Shear Strength , Stress, Mechanical , Temperature , Time Factors , Water/chemistry , Zinc Oxide-Eugenol Cement/chemistry , Zinc Oxide/chemistryABSTRACT
Introdução - Tendo em vista a ausência de trabalhos publicados avaliando o Agregado de Trióxido Mineral (MTA) de fabricação nacional no tratamento endodôntico conservador em dentes decíduos, o objetivo do presente trabalho foi comparar, do ponto de vista clínico e radiográfico, a eficácia do hidróxido de cálcio e do MTA, como materiais capeadores pulpares, após pulpotomia. Métodos - Foram seleciondos 30 molares decíduos de pacientes com idade entre 3 e 8 anos, os quais foram submetidos à pulpotomia e divididos aleatoriamente em dois grupos (Grupos I e II). O remanescente pulpar foi recoberto com uma pasta à base de hidróxido de cálcio p.a. e soro fisiológico no Grupo I, e com MTA no Grupo II. Os dentes de ambos os grupos foram restaurados com amálgama de prata ou coroa de aço cromado, sendo submetidos a avaliação clínica e radiográfica após seis meses. Resultados - Os resultados obtidos foram submetidos à análise estatística pelo teste de Fisher, com nível de significância de 5% De acordo com os critérios de avaliação clínica previamente estabelecidos, observou-se 100% de sucesso com ambos os materiais.