Biomedical subjects

V Ortolani

Publications and source records attributed to V Ortolani.

3 recordsLinked to original sources

PubMed1996

[An original proposal of a new partially crystalline glass material for dental use. Structural notes on SEM and the microscopic effects of surface acid treatment].

The authors propose a glass-ceramic material which is completely new for using in restorative dentistry. The surface etching of this material just after fusion transforms its optical characteristics and produces a nice translucency. This treatment, extremely fast, simple and cheap, takes the place of complex annealings and of expensive formulations which can create solidification germs. Our methodological choice is oriented to eliminate rather than to increase the orderly component of the composite structure (as shown by the etching treatment of the surface). Our aim is to show that this component is not formed by genuine crystals but by weak crystal-like structures, held together by Van der Waals links.

Acid Etching, Dental↗

PubMed1989

[Ceramic canal pins].

In restorative dentistry, any technique that employs retentive endoradicular pins can be associated with a simple technique that includes ceramization of the metallic surface of the pin, producing great adhesion to a composite resin by interposition of a silane coupling agent. The strong bond obtained using this technique between pin and filling material surrounding it prevents a dangerous concentration of mechanical forces around the pin itself and reduces the probability of breaks and consequent failure of the restoration.

Bicuspid↗

PubMedDate not supplied

[An evaluation of the forces in traditional and so-called "passive" post and core technics].

After a short review of the literature concerning biomechanics of cast post and core the authors analyse the distribution of mechanical stress as a function of some basic variables such as the cementation pattern or the degree of congruency between the interior walls of the root and the surface of the root segment of post and core. The authors conclude that the association of an elastic cementation to a certain incongruity between post and core and radix doesn't seem to have (in theory at least) characteristics compatible with a better protection against cervical fracture (as regards the traditional post and core).

Biomechanical Phenomena↗