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Results for “Matrix Bands”

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At least 19 recordsLinked to original sources
PubMedDate not supplied

Two-step provisional technique for onlay preparations.

Compared to full crown temporization, direct autocured resin provisional technique for intracoronal onlay preparations is more complicated and less predictable. Clinical concerns include possible pulpal irritation, extra chair time for contouring proximal and marginal excess, and a critically short time constraint to remove the curing resin in the "rubbery stage" to avoid distortion or "locking" into the preparation. A two-step direct technique using two new light-cured provisional resins addresses these problems. First, a light-cured, elastic resin is condensed against the internal preparation walls and confined within a wedged metal matrix band. Then, using a clear template matrix, the elastic foundation is overlaid with a strong and esthetic light-cured provisional resin.

Acrylic Resins↗
PubMed1991

Wedges in restorative dentistry: principles and applications.

Overhanging margins of proximal restorations are a well-known, iatrogenic cause of periodontal pathology. The high incidence of such findings in Western societies should arose the concern of the dental community. However, overhanging margins represent only part of the iatrogenic problem created by the misuse of wedges in restorative procedures. Other causes include incorrect proximal contouring, inadequate contact points and under- or overfilling the restorative material. The understanding of the variables associated with wedge selection and positioning has a major role to play in the prevention of iatrogenic periodontal pathology associated with restorative procedures. It is concluded that: (i) the occlusion of the matrix band to the remaining healthy tooth structure of the gingival cavosurface line angle should be achieved solely by the correct application of the wedges; (ii) the effect of the wedges on the proximal contour and contact area should be carefully re-evaluated prior to insertion of the restorative material; (iii) various sizes and shapes of wedges and a sharp knife for carving must be readily available.

Dental Caries↗
PubMed1976

A technique for fabricating dies.

A technique for fabricating dies without using a die saw has been described. The technique saves the time consumed in sawing the dies and eliminates the hazards of using a die saw. It is particularly advantageous when little space exists between dies since the Zolnowski matrix band is thinner than the thinnest saw blade. The band can be easily placed in the tightest interproximal spaces and can be secured in place with a minimum amount of sticky wax. The technique can be used for crowns, fixed partial dentures, and indirect inlays.

Dental Casting Technique↗
PubMed1979

Reinforced matrices for pin-amalgam restorations reduce microleakage.

The considerable decrease in microkeakage in the compound-reinforced restorations may be due to the tighter fit of the matrix band at the gingival wall of the preparation, which allows better condensation and marginal sealing of the restoration. The compound prevents lateral migration of the band during condensation pressures.

Dental Amalgam↗
PubMed1990

Endochondral calcification by hypertrophic chondrocytes in the Meckel's cartilage grafted into the isogenic mouse spleen.

We found that when the midsection of Meckel's cartilage bars obtained from mice on the eighteenth day of gestation were grafted into isogenic mouse spleen, chondrocytes induced an endochondral calcification. Concurrent with the onset of calcification throughout Meckel's cartilage matrix, periodic banded thick collagen fibrils and matrix vesicles were observed around the chondrocytes. Although most of the chondrocytes prior to grafting were hypertrophic cells, they survived for seven days in the splenic tissue and had well-developed secretory organelles. The cells which were surrounded by calcified matrix were relatively small, spherical, and showed a morphology closely resembling that of osteocytes. These findings suggest that the life span of hypertrophic chondrocytes is influenced by the microenvironment of the spleen.

Animals↗
PubMed1989

Proteins of Newcastle disease virus envelope: interaction between the outer hemagglutinin-neuraminidase glycoprotein and the inner non-glycosylated matrix protein.

Using linear sucrose-density ultracentrifugation analysis of Triton-solubilized Newcastle Disease Virus envelopes, we have evidenced, for the first time, the existence of interactions between the outer hemagglutinin-neuraminidase transmembrane glycoprotein and the inner non-glycosylated peripheral matrix protein. Such interactions seem to be electrostatic. These conclusions are based on the behavior of both proteins at different ionic strengths. When in low ionic strength buffer, hemagglutinin-neuraminidase and matrix proteins band together in the sucrose gradient, whereas at high ionic strength both proteins band at different rates in the gradient. The behavior of the inner matrix protein in our conditions was the expected one for a peripheral protein. The results of these 'in vitro' studies are also discussed in terms of the possible 'in vivo' role of such interactions.

Animals↗