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Biomedical subjects

M Zalkind

Publications and source records attributed to M Zalkind.

At least 37 records · Page 2Linked to original sources
PubMed1994

Effect of impression materials and techniques on the marginal fit of metal castings.

The effect of two impression materials used in three different techniques was tested for the accuracy of the marginal fit of metal castings. Sixty identically prepared Ivorine teeth were divided into groups of 20. The following methods were selected to make impressions: (1) putty in a metal stock tray with simultaneous elastomeric impression wash, (2) copper band relined with autopolymerizing acrylic resin and subsequent light-body elastomeric impression material, and (3) copper bands with modeling compound. Faciolingual sections of the Ivorine teeth with cemented metal castings were examined by scanning electron microscopy (SEM) at x 100 magnification. Measurements of the thickness of cement layers were calculated both manually and by use of a recently developed computerized method. The differences in the gingival marginal gaps between various impression materials and techniques at both the facial and lingual surfaces were not statistically significant.

Acrylic Resins↗
PubMed1992

Clinically versus laboratory photocured facings.

Acrylic and composite resin facings may fracture or become detached from the metal framework. Insufficient retention, abrasion and trauma are among the causes of these phenomena. Clinical and laboratory techniques have been developed to fabricate facings by means of light-curing composite systems such as the Dentacolor (Kulzer, Inc.) system. The effect of different polishing methods, obtained in both techniques using the same material, was studied with SEM on samples. Finishing and polishing procedures were accomplished using fine finishing diamonds, diamond burs and sof-lex discs. Smooth and lustrous surfaces were obtained with finishing discs, in contrast to techniques using other finishing instruments. Little or no difference in surface texture was observed between samples finished by clinical and those finished by laboratory techniques.

Composite Resins↗
PubMed1991

Delayed treatment of a mid-root fracture.

A case of delayed treatment of a mid root fracture is presented. A radiolucent lesion at the fracture line was treated with calcium hydroxide in the coronal fragment for nine months. Clinically, the tooth became firm and the radiographic results showed healing of the lateral lesion and hard tissue filling in the space at the fracture line.

Adult↗
PubMed1991

In vitro efficacy of sodium perborate preparations used for intracoronal bleaching of discolored non-vital teeth.

Bleaching materials containing 30% hydrogen peroxide have been used successfully for the treatment of discolored non-vital teeth. Intracoronal application of these materials was occasionally associated with the development of external root resorption. Extracted human teeth with intact crowns were discolored in vitro and bleached with three preparations of sodium perborate. These preparations included: sodium perborate with 30% hydrogen peroxide, sodium perborate with 3% hydrogen peroxide and sodium perborate with water. The bleaching materials were placed in the pulp chamber of the discolored teeth and sealed with IRM for 14 days. They were replaced with fresh preparations after 3 and 7 days. The coronal tooth shades were evaluated after 3, 7 and 14 days and a comparison of the bleaching success of the groups was made at each interval. It was found that after 14 days and three bleachings there was no significant difference in success between the groups. It is therefore recommended that sodium perborate be used in combination with water rather than with hydrogen peroxide to reduce the risk of post-bleaching external root resorption.

Borates↗
PubMed1989

Response of the dental pulp to capping with a composite resin-bonded ceramic and dental adhesive in rat molars.

An inflammatory response occurs in the pulp tissue following the application of dental materials due to their chemical properties and/or a secondary bacterial irritation. Recently, a new line of composite resin products with reported improved esthetic qualities was designed to allow an intimate adherence with the dentin. This intense bonding could prevent bacterial penetration and marginal discoloration of these restorations. In addition, this method allows prevention of excessive removal of hard tissue. The present study examines pulpal reaction to capping with P-10 composite resin (Dental Products, USA) in rats. Histological examination did not reveal any inflammatory reaction in the nonexposed pulps. Direct pulp capping with P-10 induced formation of reparative dentin bridges.

Animals↗
PubMed1989

Pulp capping with hydroxyapatite ceramic in rat molars.

Direct pulp capping with a hydroxyapatite ceramic in rat molars induced the formation of reparative dentin in the exposure sites after 2 weeks. In addition, foci of acute and chronic pulpitis were detected. After 6-8 weeks of application of the material partial or total necrosis occurred. The use of hydroxyapatite as a possible pulp capping material is discussed.

Animals↗
PubMed1985

The tilted posterior tooth. Part III: Abutment for a fixed partial denture.

The problem of achieving a common path of insertion for a fixed partial denture when a tilted posterior abutment is involved can usually be solved by well planned tooth preparation in conjunction at times with intentional endodontic therapy. When tooth preparation alone cannot solve the problem, the mechanical solutions of the locked attachment and the telescopic retainer are available and must be considered. Other problems involved with the tilted abutment, adjacent tilted teeth, space reduction, supraversion of the antagonist, and the problem of a long-span fixed partial denture were discussed.

Bicuspid↗
PubMed1984

Repairing a crown-sleeve coping prosthesis. Part II.

A crown-and-sleeve coping prosthesis and its retainer have been defined and reasons for the failure of an abutment tooth have been discussed. A detailed procedure for repairing a CSC prosthesis when extraction of one abutment tooth is necessary has been presented. A technique for restoration of a carious abutment tooth that supports a CSC prosthesis will be described in a future article.

Crowns↗
PubMed1984

Fabrication of a replacement for a broken attachment.

A clinical and laboratory procedure is described for remaking a lost attachment for a removable partial denture rather than remaking the entire denture. This method enables continued use of the removable partial denture while the new attachment is made in the laboratory.

Denture Precision Attachment↗