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Biomedical subjects

J L Lui

Publications and source records attributed to J L Lui.

16 recordsLinked to original sources
PubMed1994

Composite resin reinforcement of flared canals using light-transmitting plastic posts.

Composite resins have been advocated as a reinforcing build-up material for badly damaged endodontically treated teeth with flared canals. However, the control of an autocuring composite resin is difficult because it polymerizes rapidly within the root canal. While the light-curing composite resins are more user friendly, their polymerization can be a problem deep in the root canal. Light-transmitting plastic posts allow the transmission of light into the root canal and enable intraradicular composite resin reconstitution and reinforcement of weakened roots. At the same time, the light-transmitting plastic post forms an optimal post canal in the rehabilitated root and can accurately fit a matching retentive final post. These light-transmitting posts are a useful addition to the dental armamentarium.

Composite Resins↗
PubMed1992

Treatment of root fracture with accompanying resorption using cermet cement.

A method of treating an apical root fracture with accompanying resorption at the junction of the fracture fragments using glass-cermet cement is described. Endodontically, the material had previously been used for repair of lateral resorptive root defects and retrograde root fillings. Complete bone regeneration was observed three years post-operatively following treatment of the root fracture in the conventional manner. The various advantages of glass-cermet cement as a root filling material used in the technique described are discussed.

Adult↗
PubMed1992

Cermet reinforcement of a weakened endodontically treated root: a case report.

Many clinical applications have been recommended for glass-cermet cement because of its improved properties compared to the original glass-ionomer cements. It has also been accepted as a dentinal substitute that can strengthen teeth. In this paper, an additional clinical application for glass-cermet cement, the reinforcement of weakened endodontically treated roots, is suggested. This technique is in keeping with the trends of tooth conservation and the use of an adhesive restorative material in the restoration of severely damaged teeth by a conservative approach.

Cermet Cements↗
PubMed1988

Anchor-retained bridge: a conservative approach to tooth replacement.

The replacement of missing teeth by means of the recently-introduced anchorage system is described. The indications, contra-indications, advantages and disadvantages of the anchor-retained bridge are also discussed. This bridge should be an addition to the repertoire of the restorative dentist as it has a definite place in fixed prosthodontic work in carefully selected cases.

Denture Design↗
PubMed1987

Margin quality and microleakage of Class II composite resin restorations.

Margin quality and isotope microleakage analyses of Class II restorations placed in extracted human molars were compared using various composite resins and placement techniques. At occlusal margins, the traditional (experimental) composite resin restoration placed by the incremental technique showed less microleakage than did the traditional (commercial) [corrected] composite resin restoration placed by the bulk technique. In each group, the occlusal and proximal adaptations had significantly higher "excellent margin" than did the cervical adaptation. Thus, the marginal adaptation at the cervical aspect of conventional Class II composite resin restorations may present a problem with respect to microleakage.

Calcium Radioisotopes↗
PubMed1987

Treatment of discoloured anterior teeth using a simple veneering technique.

Discoloration of anterior teeth presents the restorative dentist with a complex aesthetic problem. Various methods are available for the management of discoloured anterior teeth. A simple one visit veneering technique using new improved composite resin materials and opaquing agents is described. Even though the technique provides interim treatment only, it has its advantages and definite clinical applications. The aesthetic result obtained is dramatic as the various shades available allow mixing and characterisation and even patient approval before polymerizing using a light curing system. The development of opaquing agents has allowed even the most severely discoloured anterior teeth to be adequately masked so that the underlying discoloration will not show through the translucent composite resin veneers.

Dental Veneers↗
PubMed1982

The surface finish of the new microfill restorative materials. A scanning electron microscope study.

Surface smoothness is an important requirement for restorative materials. Recently, restorative materials claimed to be inherently smooth in surface characteristics have been developed. Matrix-formed and finished surfaces of five new microfill restorative materials were compared with two composite resins, an acrylic resin and a silicate cement by means of scanning electron microscopy. The results of this investigation indicated that the matrix-formed surfaces of all the restorative materials studied were not altogether perfect. Polishing using sandpaper and cuttlefish discs produced a very smooth surface finish in the new microfill restorative materials, Estic microfill, Estilux microfill, Isopast, Isolux and Silar which was comparable to that of the acrylic resin, Sevriton. The composite resins, Adaptic and Estilux exhibited the worst surface finish and the silicate cement, Bio-trey was intermediate. Finishing, using other finer polishing devices on four of the materials produced a further improvement in the surface finish.

Acrylic Resins↗
PubMedDate not supplied

Depth of composite polymerization within simulated root canals using light-transmitting posts.

In this study, the depth of cure of composite resins cured within simulated root canals by means of light-transmitting plastic posts was compared to that achieved by the conventional light-curing method. Six sizes of posts with diameters of 1.05 mm, 1.20 mm, 1.35 mm, 1.50 mm, 1.65 mm, and 1.80 mm were investigated. In general, the larger the post diameter, the greater was the depth of cure. There were significant differences in the depth of cure between the control and all sizes of posts investigated. There were also significant differences between the various post diameters except for the 1.35 mm and 1.50 mm diameter posts. It was possible to achieve a depth of cure exceeding 11 mm using these light-transmitting posts.

Analysis of Variance↗