Results: 594

Four chemical methods of porcelain conditioning and their influence over bond strength and surface integrity

OBJECTIVE: To assess four different chemical surface conditioning methods for ceramic material before bracket bonding, and their impact on shear bond strength and surface integrity at debonding.METHODS: Four experimental groups (n = 13) were set up according to the ceramic conditioning method: G1 = 37% p...

Stress analysis in maxillary all-on-four model

The aim of this research was to evaluate the load distribution in tilted distal implants used in the all-on-four system. Two implant schemes were used. In both, two vertical anterior implants and tilted posterior implants were installed, one group with an angulation of 15 and another with an angulation o...

Evaluación in vitro del efecto de la concentración y el tiempo de aplicación del ácido fluorhídrico sobre la resistencia a la flexión biaxial y la rugosidad del disilicato de litio de última generación

El objetivo fue evaluar in vitro el efecto de la concentración y del tiempo de aplicación del ácido fluorhídrico sobre la rugosidad de la superficie y la resistencia a la fractura de la cerámica de Disilicato de litio de última generación. Se fabricaron 90 discos de cerámica IPS e.max press (14 m...

The biocompatibility of a new endodontic paste used in dental trauma

Objective: This study investigated the short-term subcutaneous tissue reaction of a new endodontic paste, based on the association among calcium hydroxide [Ca(OH)2], 2% chlorhexidine gel (CHX) and zinc oxide (ZnO) in comparison with a control paste, and the individual substances alone. Material and metho...

Sterilizing elastomeric chains without losing mechanical properties. Is it possible?

OBJECTIVE: To investigate the effects of different sterilization/disinfection methods on the mechanical properties of orthodontic elastomeric chains. METHODS: Segments of elastomeric chains with 5 links each were sent for sterilization by cobalt 60 (Co60) (20 KGy) gamma ray technology. After the procedur...

Do resin cements influence the cuspal deflection of teeth restored with composite resin inlays?

Acta odontol. latinoam; 28 (1), 2015
The aim of this study was to evaluate the influence of different resin cements on the cuspal deflection of endodontically treated teeth restored with composite resin inlays. Sixty upper premolars were randomly divided into five groups (n=12): 1 - sound teeth; 2 - cavity; 3 - Rely X ARC; 4 - RelyX Unicem;...

Influence of polishing protocol on flexural properties of several dental composite resins

Acta odontol. latinoam; 28 (1), 2015
The aim of this study was to determine the influence of the finishing protocol (FP) on flexural properties of several composites (CR). Twenty composite samples (25x2x2 mm) were prepared: G1 HelimolarR; G2 Filtek™ Z350;G3TetricR N Ceram, G4 Point 4™, G5 Premisa™; G6 Esthet.XR HD, G7 ice,...

Degradação química e citotoxicidade in vitro de cimentos resinosos fotopolimerizáveis

O objetivo deste estudo foi investigar o efeito degradante da saliva artificial e do ácido lático sobre diferentes cimentos resinosos fotopolimerizáveis e avaliar os efeitos citotóxicos dos extratos da degradação em saliva artificial sobre fibroblastos Balb/c 3T3 de ratos. Os cimentos Variolink II ...

Avaliação da resistência de união de cimentos endodônticos experimentais à base de MTA e butiletilenoglicol dissalicilato

O objetivo deste estudo foi avaliar a resistência de união de dois cimentos endodônticos experimentais à base de MTA e butiletilenoglicol dissalicilato: MTAe e MTAe-HA. Os cimentos endodônticos comerciais MTA Fillapex e AH Plus foram utilizados como materiais de referência para comparação. Vinte ...

Influência de diferentes protocolos de remoção de smear layer na resistência ao deslocamento de cimentos endodônticos à base de silicato de cálcio

O objetivo do presente estudo foi avaliar a influência de diferentes agentes quelantes [Ácido Etilenodiaminotetracético (EDTA) a 17%; Ácido Peracético (PA) a 2,25%; e Ácido Cítrico (CA) a 10%] na resistência ao deslocamento dos cimentos endodônticos à base de silicato de cálcio MTA Fillapex (A...