Results: 103

Relación entre la degeneración discal, el dolor y la estabilidad lumbar: degeneración discal
Relationship between disc degeneration, lumbar pain and stability: disc degeneration

El envejecimiento y la degeneración producen cambios en la columna vertebral, los discos pierden la capacidad de cumplir sus funciones. Se realizó una revisión critica acerca de la degeneración del disco intervertebral, el dolor y la estabilidad de la columna lumbar para lo cual se examinaron los ava...

Differences in the force system delivered by different beta-titanium wires in elaborate designs

Abstract Objective: Evaluation of the force system produced by four brands of b-Ti wires bent into an elaborate design. Methods: A total of 40 T-loop springs (TLS) hand-bent from 0.017 x 0.025-in b-Ti were randomly divided into four groups according to wire brand: TMATM(G1), BETA FLEXYTM (G2), BETA III W...

Total deformation of multiple implant-supported prostheses through three-dimensional finite element analysis

The purpose of this study was to evaluate through finite element analysis (FEA) the total deformation or displacement as a whole system of multiple implant-supported prostheses in the maxillary anterior region with different implant's length, connection, location and restoration material. An edentulous a...

Evaluation of stiffness and plastic deformation of active ceramic self-ligating bracket clips after repetitive opening and closure movements

OBJECTIVE: The aim of this study was to assess whether repetitive opening and closure of self-ligating bracket clips can cause plastic deformation of the clip.METHODS: Three types of active/interactive ceramic self-ligating brackets (n = 20) were tested: In-Ovation C, Quicklear and WOW. A standardized co...

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...

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;...

Integrin-β1, not integrin-β5, mediates osteoblastic differentiation and ECM formation promoted by mechanical tensile strain

Biol. Res; 48 (), 2015
BACKGROUND: Mechanical strain plays a great role in growth and differentiation of osteoblast. A previous study indicated that integrin-β (β1, β5) mediated osteoblast proliferation promoted by mechanical tensile strain. However, the involvement of integrin-β; in osteoblastic differentiation and extrac...

Comparación de la fuerza adhesiva de 2 sistemas de cementos de resina en diferentes regiones radiculares en la cementación de postes de fibra

La causa de fracaso más común de los postes de fibra es su desalojo, principalmente debido a la compleja adhesión dentro del conducto radicular. El principal objetivo de este estudio fue determinar si existe diferencia significativa en la resistencia adhesiva mediante el test push-out en la cementaci...