Biomedical subjects

C Piacentini

Publications and source records attributed to C Piacentini.

At least 37 records · Page 2Linked to original sources

PubMed1989

[The Caridex system for removal of caries. SEM observations].

The Authors observed at the SEM the surface of the dentine treated with the Caridex system, comparing it with the one of cavities prepared with traditional systems. The use of chemo-mechanical system consents to obtain a more indented and cleaned surface, even if more or less covered by mineralized deposits that can be removed with the use of a detergent for cavities. It results a surface particularly proper to the use of adhesives fillings materials.

Aminobutyrates↗

PubMed1989

[Aprismatic external layer of deciduous and permanent teeth].

The authors verify the presence of an aprismatic layer at the surface of human deciduous and permanent, erupted and non erupted teeth, by means of the polarizing and scanning electron microscope. The results allowed the Authors to conclude that the presence of different extents of aprismatic enamel at the surface of human teeth should be regarded as a constant and normal feature, with some different frequency and organization patterns between different tooth types.

Dental Enamel↗

PubMed1989

[Canal obturation technic. Stereomicroscopic and SEM study].

The authors compared four different methods for tooths filling employing cements and gutta-percha by means of stereo and scanning electron microscopy. For this they prepared and filled 32 monoradicular teeth divided in 4 groups of 8 elements and afterwards they made sections at 2, 5, 8 mm from the apex. The thermomechanic condensation techniques showed very good effects. Good performances come using the vertical and lateral condensation techniques when the single cone method produced variable results.

Dental Cements↗

PubMed1989

[Histological and ultrastructural observations of dentin dysplasia type I].

The Authors described a case of dentinal dysplasia type I in one patient (7.6 years). The father also presented the same pathology. The AA. presented the histological and ultra-structural observations, with scansion electron microscopy aut they showed the main aspects of these pathology: pulpal root canal obliterated with dysplastiques dentinal masses, globuliform dentin with irregular form of tubuli and rest of organic pulpar tissue with calcified material.

Child↗

PubMed1989

[The effects of the CO2 laser on human dentin and cementum].

Polarizing microscopy, scanning electron microscopy and X-ray diffraction analysis have been used to study the effects of the radiations of a CO2 laser equipment on the dentine and cementum of sound human permanent teeth. The typical lesions induced in dentine and cementum differ only lightly because of the different composition of the tissues. They assume a crater-like aspect and show structural alterations, less and less severe when moving away from the beam focal center. The morphological analysis of the tissues, which loose their organic components through combustion, suggests that such lesions are the consequences of a very fast overheating followed by a fast cooling. X-ray diffraction analysis shows that the hydroxyapatite of the tissues submitted to the thermic stress does not undergo phase transformation, which means that the temperatures remain lower than 1200 degrees C.

Dental Cementum↗

PubMed1987