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Biomedical subjects

S M Morgano

Publications and source records attributed to S M Morgano.

At least 37 records · Page 2Linked to original sources
PubMed1995

Effects of ultrasonic scaling and periodontal curettage on surface roughness of porcelain.

Changes in the surfaces of glazed porcelain were evaluated with the use of a profilometer and a scanning electron microscope after ultrasonic scaling and periodontal curettage. Thirty samples of glazed porcelain-fused-to-metal were divided into two experimental zones, and the two scaling treatments were performed on each sample. Measurements of surface roughness of porcelain were made before and after instrumentation for both periodontal prophylaxis procedures. The statistical analysis of the differences in surface changes as evaluated on the profilometer indicated that the roughness alterations from both procedures were not statistically significant; however, the qualitative or subjective evaluation of scanning electron micrographs and profile tracings revealed differences between glazed and instrumented porcelain surfaces.

Dental Alloys↗
PubMed1995

A procedure for making fixed prosthodontic impressions with the use of preformed crown shells.

Void-free impressions of tooth preparations for fixed prosthodontics are essential for accurately fitting restorations; however, commonly used impression methods are arduous and time-consuming. A procedure has been developed in which an impression is made in a preformed temporary crown shell for each tooth preparation and then a final over impression is made. The result is an atraumatic and uncomplicated complete-arch impression that incorporates an accurate impression of each prepared tooth.

Crowns↗
PubMed1995

Ability of various impression materials to produce duplicate dies from successive impressions.

This in vitro study evaluated the ability of five different impression techniques to make duplicate dies of two different types of tooth preparation. One mandibular second premolar Ivorine tooth was prepared for a complete crown and one for an onlay. A master impression was made of each tooth preparation with the use of five impression techniques for a total of 10 master impressions, and a master die was made from each of these impressions. Castings were made on these master dies, and the fit of each casting was verified on the respective Ivorine tooth. Marginal openings of the castings on the master dies were recorded under magnification at four predetermined points. Five successive impressions, with the use of each impression material, were then made of each tooth preparation for a total of 50 test impressions, and 50 test dies were made from these impressions. The fit of the respective casting was evaluated under magnification for each test die at the four predetermined points, and marginal openings were recorded. Differences between the marginal discrepancies of the casting on the master die and on the test die were tabulated and the results were statistically analyzed. Results indicated that none of the impression materials was capable of producing exact replicas. Polysulfide rubber performed significantly better than two materials for the production of duplicate dies with the complete crown preparation; and polyvinyl siloxane used with a putty-light body, single-stage technique produced mean marginal discrepancies that were significantly greater than the other four techniques when used for the onlay preparation.(ABSTRACT TRUNCATED AT 250 WORDS)

Bicuspid↗
PubMed1995

Repair of posterior base of a maxillary complete denture by use of a cast of stone and resilient material.

A method to repair a fractured complete denture and simultaneously augment deficient borders or correct an inadequate posterior palatal seal is described. Corrections were made intraorally with modeling compound and an elastomeric impression material. A resilient impression material was used to block out the undercuts in the denture, and repair was accomplished with visible light-cured resin or an autopolymerizing repair resin. This technique simplifies the laboratory procedures and thereby permits the return of the denture to the patient at the same visit.

Acrylic Resins↗
PubMed1994

Technique to restore unfavorably inclined implants.

Unfavorable inclination of implants is a common problem that may compromise esthetics, phonetics, and function of the implant-supported fixed prosthesis. Several methods have been reported to compensate for malaligned implants; however, most techniques are complicated and expensive. A technique that combines a custom abutment from a hexed UCLA-type plastic burn-out pattern and a manually threaded setscrew hole is a relatively inexpensive and uncomplicated approach to eliminate problems caused by unfavorable implant inclination. This article describes the procedures for fabrication of an implant-supported fixed prosthesis with the use of this technique.

Dental Abutments↗
PubMed1994

A diagnostic stent for endosseous implants to improve conventional tomographic radiographs.

Conventional tomographic radiographs can often provide sufficient information for presurgical evaluation for implant placement with significantly less radiation exposure than computer-assisted tomographic (CT) radiographs. A technique to fabricate a diagnostic stent with a removable indicator for the partially edentulous patient is described. This stent with an indicator guides the radiologist in making conventional tomographic images and can also be used as a template for locating the surgical sites.

Dental Implantation, Endosseous↗
PubMed1994

A nationwide survey of contemporary philosophies and techniques of restoring endodontically treated teeth.

Contemporary endodontic therapy has allowed patients to retain severely damaged teeth. The restoration of most endodontically treated teeth involves complex and controversial procedures. There is a diversity of opinion about the need for coronoradicular stabilization, and numerous post systems and techniques have been described. It is not known what materials and techniques are most commonly used. To expand the knowledge of current philosophies and prevailing techniques, a comprehensive nationwide survey of 1525 dentists was conducted. Of the 1066 respondents, 909 (85%) reported restoring more than 30 endodontically treated teeth per year, and this subset became the focus group of the survey. Board-certified prosthodontists comprised 40% of this group, educationally qualified prosthodontists 28%, and general dentists 32%. Responses to questions were statistically analyzed. Statistical analysis revealed that philosophies and techniques varied significantly with the dentist's geographic location, age, specialty status, and dental school faculty status.

Adult↗
PubMed1993

Clinical success of cast metal posts and cores.

The topic of posts for endodontically treated teeth has received considerable attention in the literature, but there is sparse in vivo research and certain information from in vitro investigations is contradictory. A retrospective study of 1273 endodontically treated teeth in the practices of nine dentists in general practice indicated an inordinately high failure rate with cast posts and cores compared with alternate systems of coronoradicular stabilization. However, a closer evaluation of the data in this study indicated that almost half of the cast posts were half the desired length or less. The indications for the cast post and core are discussed and the specific causes of failure are reviewed. Additional research is needed to compare the success rate of securely seated cast posts and cores with alternate methods of coronoradicular stabilization.

Dental Alloys↗
PubMed1993

A fixed-detachable implant-supported prosthesis retained with precision attachments.

The implant-supported, maxillary anterior, fixed-detachable prosthesis is often fabricated with a gingival flange to enhance esthetics and phonetics. However, only the dentist can remove the prosthesis, and the esthetic labial flange invariably impedes patient access for cleaning. A two-piece, fixed-detachable prosthesis that incorporates a substructure retained with conventional set screws and a superstructure retained with precision attachments has been developed. The substructure is contoured to facilitate patient access for oral hygiene because it will be covered by the superstructure and neither esthetics nor phonetics is a concern. The superstructure is easily removed by the patient for routine cleaning and can be designed for favorable esthetics and phonetics. This article reviews and describes the procedures for fabrication of this precision attachment-retained, implant-supported prosthesis.

Dental Casting Technique↗
PubMed1993

A dual-purpose stent for the implant-supported prosthesis.

Osseointegrated implants are a practical alternative to traditional prosthodontics; however, designing an implant-supported prosthesis with function and esthetics is a challenge. When the available bone or the location of vital structures is questionable, computed tomography (CT) is indispensable for diagnosis and treatment planning. This article describes a stent that implements the information from a CT scan and is then modified to guide the surgical placement of the implants.

Alveolar Bone Loss↗
PubMed1993

A new approach to salvaging an existing fixed partial denture.

This case report describes the clinical procedures for salvaging a serviceable fixed partial denture (FPD) that deteriorated because of cement dissolution beneath the distal retainer. After removal of the FPD it was noticed that the "core reconstruction" was dislodged (the prefabricated post remained in the canal and required removal). A two-stage casting procedure that differed from reported techniques was customized to fit a cast post and core to the prepared root canal and retainer. The FPD was recemented and has been functioning satisfactorily for over 3 years.

Cementation↗
PubMed1991

The implant-supported, heat-processed provisional fixed partial denture.

When fabricating an implant-supported fixed partial denture a provisional prosthesis is commonly required for function and esthetics. A laboratory-fabricated, heat-polymerized provisional restoration will provide excellent fit, function, esthetics, and durability while saving chair time. This article describes the clinical and laboratory procedures for the fabrication of the implant-supported, heat-processed provisional fixed partial denture.

Dental Implants↗
PubMed1989

Tissue management with dental impression materials.

The coordination of perceptive tissue management, diligent tooth preparation and prudent selection of the impression material for specific clinical conditions ensures the success of cast and ceramic restorations. The introduction of a knitted cord (Ultrapak with Astringedent) has alleviated the arduous aspects of tissue displacement and the new impression materials have displayed exceptional accuracy but healthy tissue is fundamental.

Crowns↗