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At least 217 records · Page 12Linked to original sources
PubMed1997

Comparison between the sequential and simultaneous approaches for the restoration of adjacent proximal cavities.

The clinical situation in which several proximal carious lesions have to be treated is frequently encountered. The need to provide a cost-effective and time-effective treatment often compels the clinician to perform multiple adjacent proximal restorations simultaneously, at the same treatment session. Alternatively, such treatments may be performed sequentially in successive sessions. The different possible treatment modalities and their clinical sequel are described. Examination of the clinical results suggests that the preferred restorative procedure is the sequential one, enabling an optimal restoration of the original anatomical form, which is important for the proper health and function of the teeth and the surrounding periodontal tissues.

Dental Restoration, Permanent↗
PubMed2000

Purification of proteins from rat sperm membranes that interact with ligands other than phosphomannosyl residues.

In this study proteins were purified from rat sperm membranes which might be the high affinity sites for ligands of epididymal fluid other than the mannose-6-phosphate receptors. The sperm membrane proteins were solubilized and passed over an affinity column containing epididymal fluid proteins coupled to a matrix. Two bands in the range of 45-55 kDa were eluted from the column with fructose-6-phosphate but not with mannose-6-phosphate. Although the molecular weight of these proteins are similar to those of the cation-dependent phosphomannosyl receptors they are not related. These two proteins may correspond either to two different receptors or to forms of the same receptor that recognize ligands from rat epididymal fluid. Sequencing and identification of these proteins will be the aim of future studies.

Animals↗
PubMed2002

Indirectly formed matrix for multiple composite core restorations: two clinical treatments illustrating an expanded technique.

The technique described in this report is an expansion of a previously reported intraoral procedure for directly developing a matrix for the fabrication of composite cores. The expanded method allows a matrix to be created indirectly after the involved teeth are trimmed or restored on a cast into slightly oversized crown preparations before the treatment visit. The cast may serve for both the matrix and the interim fixed restoration, enabling fabrication by the dental laboratory. A semirigid (occlusal registration) elastomeric material is used to form the matrix. The matrix is used to apply the composite and shape the cores after the abutment teeth have been prepared, pins or posts have been placed, and adhesive procedures have been implemented. The elastomeric matrix can be modified for use as the impression matrix. The described technique allows the simultaneous formation of multiple composite cores. An alternative method in which light-polymerized core composite is used with a vacuum-formed, dual-laminate transparent matrix is described and compared with the semirigid elastomeric matrix.

Composite Resins↗
PubMed2003

Technique for repair of multiple abutment teeth under preexisting crowns.

This technique describes a simple procedure for repairing multiple fractured or broken-down abutment teeth under existing crowns. The technique uses a Teflon tape polytetrafluoroethylene (PTFE) as a matrix and separating medium for fabrication of an autopolymerizing composite core material with digital pressure. This technique enables the dentist to solve an emergency clinical situation in a relatively short amount of time, pending further restoration with endodontic treatment and a cast post and core procedure.

Composite Resins↗
PubMed1980

Fractionation of the nuclear matrix. I. Partial separation into matrix protein fibrils and a residual ribonucleoprotein fraction.

Isolated rat liver nuclear matrices have been partially separated by means of mild sonication into a matrix protein (matricin) fraction and a residual ribonucleoprotein (RNP) fraction. The initial matricin fraction is composed largely of protein (91.1%) but also contains significant amounts of DNA (8.4%). Reconstruction experiments indicate that this DNA is not the result of the artifactual binding of DNA to the matrix during the extraction procedures. Subsequent treatment with DNase I results in purified matricin composed of greater than 99.5% protein. SDS acrylamide gel electrophoresis of the matrix protein fibrils reveals only three bands: the primary matrix polypeptides of 62,000, 66,000, and 70,000 daltons. Electron microscopy demonstrates a diffuse reticulum with fibrils as thin as 30--50 A and the presence of 80--100-A globular structures. The residual RNP fraction is composed largely of protein (80.1%) and RNA (19.5%), with only traces of DNA (1.1%). Over 98% of the total matrix-associated RNA is recovered in this fraction. SDS acrylamide gel electrophoresis indicates an enrichment in both low and high molecular weight secondary matrix polypeptides, although the 60,000--70,000-dalton polypeptides are present in significant amounts as well. Ultrastructural analysis of the residual RNP fraction reveals distinct electron-dense-staining matrix particles (150--350 A) attached to a fibrous matricin network.

Animals↗
PubMed2006

Implant breast reconstruction using acellular dermal matrix.

Thirteen breast reconstructions in 11 patients, averaging 58 years of age, underwent mastectomies. The technique uses a saline implant either totally or partially covered with a human acellular dermal matrix. The mean postoperative follow-up time was 14 months. Ninety percent of the patients were considered high risk; the thickness of the human acellular dermal matrix was an average of 1.3 mm, with an average area per breast of 121 cm. There were 12 successful breast reconstructions (92%) that provided stability, increased soft tissue padding, which allowed a greater resemblance to normal breast shape and decreased rippling and implant visibility. The graft was used in an onlay fashion or as an extension of the pectoralis major muscle that covers the implant. A representative histologic cross-section of well-integrated human acellular dermal matrix is presented. The use of a human acellular dermal matrix in breast reconstruction is an alternative protocol in high-risk patients, resulting in a minimal increase in operative time and a decrease in morbidity compared with more extensive procedures.

Adult↗
PubMed2004

Polaritonic and photonic gap interactions in a two-dimensional photonic crystal.

If an ionic material is used in a photonic crystal, the lattice resonance creates a polaritonic gap in the infrared range. The interaction between a polaritonic gap and the structure gap in a 2D square photonic crystal is studied by transfer matrix photonic band structure calculations. The polaritonic gap appears for a surprisingly low volume density of the ionic material. The TM gaps are larger than the TE gaps, as in the dielectric case. By varying the lattice constant, the structure gaps can be shifted across the polaritonic gap, and the effects of merging the two gaps can be studied.

Journal Article↗
PubMed1988

The plastic cap--an improved technique for impression taking.

An improved impression technique is described using a plastic, transparent, flexible cap in combination with silicone impression materials. The technique can easily be applied at the chairside by the clinician and provides a solution to some of the present problems in impression with minimal trauma to the surrounding tissues.

Dental Impression Materials↗
PubMed2006

Teaching of posterior composite resin restorations in undergraduate dental schools in Ireland and the United Kingdom.

PURPOSE: The aim of this study was to investigate the current teaching of posterior composite resin restorations to undergraduate dental students in Ireland and the United Kingdom (UK). The investigation was a follow-up to a survey undertaken in 1997. MATERIALS AND METHODS: A questionnaire was distributed by e-mail to the Heads of Departments of Restorative Dentistry/Units of Operative Dentistry in each of the 15 dental schools with undergraduate dental degree programmes in Ireland and the UK. The questionnaire sought information relating to the teaching of posterior composite resin restorations in each dental school. RESULTS: Fifteen completed questionnaires were returned (response rate = 100%). All schools (n = 15) taught the placement of composite resin restorations in occlusal cavities, 14 schools taught composite resin placement in two-surface occlusoproximal cavities and nine schools taught composite resin placement in three-surface occlusoproximal cavities. Respondents anticipated that the amount of preclinical teaching of posterior composite resin placement will increase twofold over the next 5 years, whilst the corresponding teaching of amalgam will fall to two-thirds its current level. Variation was found between dental schools in the teaching of the principles of cavity design, contraindications to placement, indications for lining and basing techniques, matrix and wedging techniques, and the use of curing lights. CONCLUSIONS: The amount of teaching of posterior composite resin restorations in undergraduate dental schools in Ireland and the UK has increased since the time of a previous survey in 1997. Composite resin may soon equal or overtake amalgam as the material of choice when restoring posterior cavities in Irish and UK dental schools. There was, however, much variation in the nature and extent of the teaching and the techniques taught.

Composite Resins↗
PubMed1994

Reduction of cusp deflection resulting from composite polymerization shrinkage, using a light-transmitting cone.

For investigation of whether the use of a transparent plastic cone (Light-tip) influenced cusp deflection, as compared with a conventional method (control), the following experiments were performed. Mesiodistocclusal (MOD) cavities were prepared in 10 extracted premolars, and stainless steel pins were placed on the cusps. The cavities were bonded with Scotchbond Multipurpose, and the distance between the pins was measured. Control restorations using P-50 were placed in three increments, each increment having been polymerized for 40 s. For placing the test restorations, the Light-tip was fitted to the end of the curing wand and pressed into the resin in the proximal box, and the curing light was turned on. The next increment filled the recess created after the removal of the cone in the resin, and curing was performed with the plastic cone in the occlusal box. The third increment was cured without the cone. Each tooth was used for four restorations. In 16 of 20 cases, a significantly decreased cuspal flexure was found when the cone was used. The flexure decreased 24%, as compared with control.

Bicuspid↗
PubMedDate not supplied

Use of a visible light cured elastomeric resin to stabilize cervical matrix in restoration of Class V erosion lesion.

Effective moisture control and gingival retraction are essential prerequisites for success in the restoration of Class V bonded restorations. Various techniques exist for cervical isolation and moisture control in Class V restorations. This case report details a modified technique in which a visible light cured elastomeric resin was utilized to stabilize a cervical matrix in restoration of a Class V erosion lesion. The resultant customized matrix provides effective isolation, moisture control, and gingival retraction when used in conjunction with Class V restorations.

Dental Cavity Preparation↗