Biomedical subjects

B Marshak

Publications and source records attributed to B Marshak.

15 recordsLinked to original sources

PubMed1996

Analysis of load transfer and stress distribution by an implant-supported fixed partial denture.

This study simultaneously examined the load transfer and stress distribution by an implant-supported fixed partial denture. A mandibular implant framework with implants connected to the abutments was embedded in a three-dimensional photoelastic model of a mandible. Strain gauges were attached on the superior surface of the framework, and a vertical load of 7.5 kg was applied to seven points on the framework. The measurements derived from this simulation revealed that (1) there was a direct proportion between the stress distribution in the metal framework and stresses created in the supporting structure around the implants; (2) the mode of load transfer and stress distribution was directly proportional to the distance of the components from the loading point; and (3) when the cantilever was loaded, the major part of the stress was distributed within the cantilever in the connection to the distal abutment. In this simulation, stress was distributed over the two, or maximum three, closest implants with the distal implant the most stressed.

Birefringence↗

PubMed1994

A modified impression technique for implant-supported restoration.

An impression technique is proposed for construction of implant-borne restorations that uses a modified autopolymerizing resin custom tray to allow splinting of the impression copings directly to the tray. This method eliminates the use of the dental floss-autopolymerizing resin complex, thus decreasing resin distortion and simplifying the clinical procedures.

Acrylic Resins↗

PubMed1994

Implant-retained mandibular overdentures: a simplified, cost-effective treatment approach.

The use of implant-retained complete overdentures is a viable treatment modality in compromised patients. Use of two separate implants in the mandible enhances the retention and stability of the denture, which is still mainly supported by soft tissues. A technique for clinical fixation of the internal attachment to a laboratory-rebased and tissue-loaded mandibular overdenture is described. The advantages, disadvantages, and the rationale of the treatment are presented.

Dental Abutments↗

PubMed1991

Restoring teeth following crown lengthening procedures.

Crown lengthening procedures are often necessary to successfully restore teeth that have been mutilated at or below the level of the bone crest. Forced eruption is preferred to surgical removal of supporting alveolar bone, since forced eruption preserves the biologic width, maintains esthetics, and at the same time exposes sound tooth structure for the placement of restorative margins. To properly construct a crown, the minimal distance from the alveolar crest to the coronal extent of sound tooth structure should be 4 mm. Before initiation of forced eruption, the restorability of the root after completion of the orthodontic phase must be considered. A technique is suggested to calculate the root-to-crown ratio that will be created after root extrusion with respect to the coronal level of sound tooth structure before treatment.

Dental Restoration, Permanent↗

PubMed1990

A controlled putty-wash impression technique.

A precise impression is imperative for the construction of an accurately fitting indirect cast restoration. The putty-wash technique is commonly used in making impressions with silicone elastomers. Errors in manipulation may lead to inaccurate impressions. A technique is presented ensuring exact reseating of the putty impression tray and creation of a uniform wash space, which are essential for accurate results.

Dental Impression Technique↗

PubMed1989

Diagnostic casts--an additional dimension.

The indications and usefulness of diagnostic casts are well documented in the literature. A method is presented that enables increased access to the lingual aspect of the casts by sectioning them in a midsagittal plane. The sectioned portions are held together in maximum intercuspation by acrylic keys. The interdigitated casts can thus be examined from all aspects, thereby deriving maximum benefit from them.

Acrylic Resins↗

PubMed1989

Prevalence of Candida albicans in denture wearers in an Israeli geriatric hospital.

Thirty-seven patients wearing complete dentures were investigated for Candida albicans. Twenty-five of the patients suffered from denture stomatitis and twelve had clinically normal mucosa. Candida albicans was isolated and identified from Sabouraud dextrose agar culture medium models constructed from impressions of the maxilla and from the upper dentures. The presence of Candida albicans was demonstrated in all denture wearers suffering from denture stomatitis and in 82% of denture wearers in a control group. A higher concentration of Candida was found in the denture stomatitis group. Large quantities of Candida resided in the denture base and not in the palate. Candida was also found in the denture base in areas not related to the lesion. The concentration of Candida was related to denture cleanliness.

Aged↗

PubMed1987