Biomedical subjects

Winston W L Chee

Publications and source records attributed to Winston W L Chee.

12 recordsLinked to original sources

PubMed2005

Use of a removable partial denture in the management of chronic screw loosening.

Lack of posterior support can result in adverse occlusal forces being placed on anterior teeth. These forces may cause fremitus, splaying of the anterior teeth, and even accelerated wear. When implant-supported restorations are used, a common indicator of overload is screw loosening. This clinical report demonstrated conservative management of a patient who presented with multiple episodes of screw loosening of an implant-supported restoration replacing the maxillary left incisor secondary to developing reduced posterior support. Ideal treatment would be to re-establish posterior support by means of implant-supported restorations; however, this option was constrained by finances.

Dental Implants, Single-Tooth↗

PubMed2005

Critical appraisal. Immediate loading of implants in the esthetic zone.

The predictability of dental implants using the traditional branemark protocol has been well documented. Since its inception, this protocol has been progressively challenged to decrease treatment time, minimize the number of surgical procedures, and maximize esthetic outcomes. Today, in specific clinical situations, implants may be placed and immediately loaded with provisional restorations. Immediate loading in the edentulous mandible has been well documented. There are also good data to show that immediate loading of the edentulous maxilla is also feasible if bone quality is suitable. The focus now has shifted toward immediate loading of implants placed in the esthetic zone. Clinicians have recognized that the challenge of providing anterior tooth replacements is in preserving the hard and soft tissue components that exist around natural teeth. The advantages of immediate restoration are obvious; however, the application of immediate or early load may pose an increased risk of implant failure in single-tooth situations. The prerequisites for achieving and maintaining acceptable results are not fully known. This review examines some of the literature concerning the reliability of early or immediate loading of implants placed in the esthetic zone.

Comment↗

PubMed2005

An interdisciplinary approach to treatment planning in implant dentistry.

The practice of implant dentistry requires an interdisciplinary approach that integrates the knowledge, skills, and experience of all the disciplines of dentistry into a comprehensive treatment plan. The team must examine the anticipated restorative site to determine the suitability of the existing hard and soft tissues for implant placement. Deficiencies in hard and soft tissue, which prevent ideal implant placement, must be recognized and addressed to ensure a more predictable esthetic outcome. This article outlines a comprehensive interdisciplinary treatment philosophy designed for developing the foundation of optimal esthetics in implant dentistry. Cases are presented to illustrate the utility of interdisciplinary treatment in which specialists are recruited to enhance and improve a patient's dental function and esthetics.

Adult↗

PubMed2005

Treatment planning: implant-supported partial overdentures.

When multiple anterior teeth are missing, many options of replacement are available. Traditionally, the choice was between a fixed or removable prostheses. Today, with the predictability of dental implants, the options of tooth replacement range from removable partial dentures to implant-supported fixed prostheses. The choice of which restoration that will best provide occlusion and esthetics depends on multiple factors including the number and location of missing teeth, the residual ridge form in relation to the replacement teeth, the relationship of the maxillary and mandibular anterior teeth, the condition of teeth adjacent to the edentulous span, the amount of bone available for implant placement, the patients "smile line" and display of teeth, lip support, and financial constraints. When there is minimal loss of the ridge contour, restorations that emerge from the ridge are the most functional and esthetic restorations, adhesive-type fixed partial dentures, conventional fixed partial dentures, and implant-supported restorations can be indicated with the choice of restoration dependent on a risk benefit and cost benefit analysis. When there is a loss of ridge contour due to residual ridge resorption or trauma, the decision becomes more complex as not only does the tooth structure need to be replaced, the ridge form also has to be replaced. (Figures 1 and 2). This can be assessed clinically as illustrated by Figures 1 and 2 where a dis crepancy in arch form and ridge form in relation to the adjacent teeth and/or opposing arch can be observed. Other considerations are lip support and display of the teeth when smiling. This article presents a case and rationale for implant-supported par tial overdentures. Many authors have written on the merits of com plete overdentures. The complete overdenture has proven to be an improvement over conventional complete prostheses with respect to chewing efficiency, patient comfort and satisfaction. In partial edentulism, the implant-supported overdenture has several advantages, some in common with a removable partial denture.

Alveolar Bone Loss↗

PubMed2004

Current concepts in gingival displacement.

Gingival displacement is an important procedure with fabricating indirect restorations. Gingival displacement is relatively simple and effective when dealing with healthy gingival tissues and when margins are properly placed a short distance into the sulcus. Several techniques have proven to be relatively predictable, safe,and efficacious. No scientific evidence has established the superiority of one technique over the others, so the choice of technique depends on the presenting clinical situation and operator preference.

Astringents↗

PubMed2004

Cervical margin design with contemporary esthetic restorations.

The contemporary dentist has a wide variety of options to use in the restoration of extensively damaged or previously restored teeth. Metal-ceramic and all-ceramic crowns are frequently used to restore esthetics and function. One of the essentials for success with either option is proper tooth preparation, which includes proper selection and preparation of the cervical margin of the preparation.

Ceramics↗

PubMed2004

A review of contemporary impression materials and techniques.

The contemporary restorative dentist has a host of impression materials available for making impressions in fixed prosthodontics,implant dentistry, and operative dentistry. With proper material selection and manipulation, accurate impressions can be obtained for fabrication of tooth- and implant-supported restorations. This article outlines the ideal properties of impression materials and explains the importance of critical manipulative variables. Available impression materials are analyzed relative to these variables, and several "specialized" impression techniques are described. Special attention is paid to polyvinyl siloxane impression materials because they have become the most widely used impression material in restorative dentistry.

Chemical Phenomena↗

PubMed2004

Distortion of disposable plastic stock trays when used with putty vinyl polysiloxane impression materials.

STATEMENT OF PROBLEM: Impressions are made using high-viscosity putty vinyl polysiloxane impression materials in conjunction with disposable plastic stock trays. The impression materials have been shown to be dimensionally stable. However, it remains unclear if the disposable plastic stock trays are rigid enough to resist deformation thus yielding potentially unreliable results. PURPOSE: This study evaluated the rigidity and ability to resist deformation of 6 commercially available disposable plastic stock trays and 1 metal stock tray when used in conjunction with a high-viscosity vinyl polysiloxane impression material. MATERIAL AND METHODS: Ten impressions were made with 1 putty vinyl polysiloxane material (Reprosil Putty) using each of the 6 tested disposable plastic stock trays, Sani-Trays (perforated), Sani-Trays (nonperforated), COE Disposable Spacer Tray (perforated), COE Disposable Spacer Tray (nonperforated), Bosworth Tray-Aways (perforated), Track-it Trays (perforated), and 1 metal stock tray (nonperforated), Cadco Dental Products, as a control on a mandibular plastic model. The dimensions of the tray in cross section at the mandibular right first molar area were measured before, during, and after the impression procedures with an electronic digital caliper. The cross-arch dimensions of the tray were measured at similar intervals. One examiner made all measurements and each measurement was repeatable within +/-0.01 mm. A split plot repeated measures analysis of variance (ANOVA) was performed and 2-sided P -values were calculated (alpha=.05). RESULTS: The results indicated that the disposable plastic trays tested were not sufficiently rigid to resist deformation when used with very high-viscosity putty material. Metal stock trays showed significantly less change in cross-arch dimension than plastic trays (F(1.68)=11.25, P =.001). Metal stock trays also showed significantly less change in cross-sectional arch dimension than plastic trays (F(1.68)=15.15, P<.001). CONCLUSION: When disposable plastic stock trays were tested in conjunction with very high-viscosity impression materials there was distortion of the tray both across the arch and in cross section.

Dental Impression Materials↗

PubMed2003

Simple tools to facilitate communication in esthetic dentistry.

Communication is a critical element to obtaining satisfying results with esthetically driven treatment. Communication must first be established with the patient then among all the clinicians and technicians involved with the treatment to achieve the esthetic goals of the patient. This article will review methods to communicate esthetic parameters to allied specialists and the dental technician.

Communication↗

PubMed2003

An interdisciplinary approach to treatment planning in the esthetic zone.

The practice of prosthodontics requires a multidisciplinary approach that integrates the knowledge, skills, and experience of all the disciplines of dentistry into a comprehensive treatment plan. This article outlines a comprehensive interdisciplinary treatment philosophy designed for developing the foundation for optimal esthetics in fixed prosthodontics. Cases are presented to illustrate the utility of interdisciplinary treatment in which specialists are recruited to enhance and improve a patient's dental function and esthetics.

Crown Lengthening↗

PubMed2003

Treatment planning and soft-tissue management for optimal implant esthetics: a prosthodontic perspective.

Esthetic restoration of implants in the anterior region of the mouth is one of the most difficult procedures to execute. This article discusses patient selection criteria. Implant position and its relationship to the esthetic outcome are also addressed. The importance of soft-tissue management in all phases of the surgical and restorative phases is emphasized. Guidelines are given for the successful delivery of this service for the patient.

Dental Implantation, Endosseous↗

PubMedDate not supplied

Surgical template stabilization with transitional implants in the treatment of the edentulous mandible: a technical note.

Proper placement and orientation of dental implants is a requirement for the optimum function and esthetics of the definitive restoration. Surgical template stability during the surgical phase is a key element in the success of proper implant placement. Therefore, any clinical tool that enhances the precision of reproduction is of value. This article describes a simple, noninvasive, cost-effective technique for surgical template stabilization utilizing 2 transitional implants placed the same day as the definitive implants.

Acrylic Resins↗