Creating a path of insertion for implant supported restorations adjacent to natural teeth.
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Dental Abutments↗
Biomedical subjects
David R Cagna
Publications and source records attributed to David R Cagna.
Esthetic design in removable partial prosthodontics.
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Biomechanical Phenomena↗
Occlusal device for diagnostic evaluation of maxillomandibular relationships in edentulous patients: a clinical technique.
Identifying and recording appropriate occlusal vertical dimension (OVD) and centric relation positions during the treatment of edentulous patients is necessary for predictable and successful therapy. When alterations of existing conditions are indicated, it is beneficial for both the clinician and patient to evaluate the esthetics, phonetics, function, and comfort associated with planned changes in maxillomandibular relationships before fabricating new prostheses. A procedure used to modify existing unacceptable maxillomandibular relationships and clinically monitor the effects of these alterations prior to fabrication of definitive complete dentures is presented. Acceptance of the new OVD position by both the patient and dentist following an initial diagnostic phase is important to predictable and successful treatment.
Centric Relation↗
The hollow maxillary complete denture: a modified technique.
The severely atrophic maxilla poses a clinical challenge for fabrication of a successful complete denture. This article describes a novel method for fabrication of a hollow maxillary complete denture. It incorporates a clear, pressure-formed matrix of the trial denture external contours to facilitate the fabrication of a silicone putty cavity form. This cavity form ensures the appropriate dimensions of both the denture base acrylic resin for structural integrity and the denture base cavity for optimal weight reduction.
Acrylic Resins↗
Retention characteristics of attachment systems for implant overdentures.
PURPOSE: The aim of this study was to compare the retention characteristics of various overdenture attachment systems commonly used to retain overdentures to dental implants. MATERIALS AND METHODS: An edentulous mandibular model was constructed incorporating 2 parallel 4.0 mm x 13 mm Branemark implants placed in the canine regions. Attachments were embedded in a metal-reinforced experimental overdenture designed to be dislodged from the model by a universal testing machine. Tensile dislodging force was applied to the overdenture at a cross-head speed of 50 mm/min. Five overdentures were constructed for each of the attachment systems. The attachments evaluated were the Hader bar & metal clip, Locator LR pink, Locator LR white, Spheroflex ball, Shiner magnet, Maxi magnet, Magnedisc magnet, ERA white, and ERA gray. Each apparatus was tested with 5 specimens per attachment system. Peak load-to-dislodgement was measured. Analysis of variance and Scheffe multiple comparison tests were applied to the data with alpha< or = 0.05 level of significance. RESULTS: Peak load-to-dislodgement for all attachment systems ranged from 3.68 +/- 1.32 N to 35.24 +/- 1.99 N. Strain-at-dislodgement, calculated from stress-strain curves, ranged from 0.78 +/- 0.20% to 2.78 +/- 0.5%. The ERA gray attachment demonstrated the greatest retention, with a peak load-to-dislodgement of 35.24 +/- 1.99 N, and a relatively low strain-at-dislodgement of 1.64 +/- 0.09%. Less retention was recorded for the Locator LR white, Spheroflex ball, Hader bar & metal clip, and ERA white systems. The Locator LR pink attachment demonstrated still less retention with a load-to-dislodgement of 12.33 +/- 1.28 N. Significantly high strain-at-dislodgement was recorded for the Hader bar & metal clip and Locator nylon attachment systems. The lowest dislodging loads and strains were recorded for the Shiner magnet, Maxi magnet, and Magnedisc magnet attachments. CONCLUSIONS: Results suggest that the attachment systems evaluated may be grouped into high (ERA gray), medium (Locator LR white, Spheroflex ball, Hader bar & metal clip, ERA white), low (Locator LR pink), and very low (Shiner magnet, Maxi magnet, Magnedisc magnet) retention characteristics.
Analysis of Variance↗
A review of complete denture therapy for patients with compromised retention.
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Adhesives↗
Characteristics and porcelain bond strength of (Ti,Al)N coating on dental alloys.
The effect of a novel titanium-aluminum nitride film, or (Ti,Al)N film, on the bond strength between a dental porcelain and two nickel-based dental alloy substrates was investigated. A thin layer of (Ti,Al)N film was deposited on flat metal samples using a reactive radio-frequency sputtering method. A uniform thickness of porcelain was applied to the film- coated metal samples. Metal-ceramic specimens were subjected to three-point bending, and failure loads were recorded. Bond strengths between the porcelain and (Ti,Al)N-coated metal alloys ranged from 159.0 +/- 11.7 N to 278.0 +/- 12.3 N. These values were significantly greater (p< 0.05) than bond strengths recorded for control samples that did not incorporate the (Ti,Al)N film. An electron probe microanalyzer with a line profile mode was used to characterize the interface between the (Ti,Al)N film and the porcelain. Results of this investigation suggest that the (Ti,Al)N film (1) increases the flexural bond strength between dental porcelain and nickel-based alloy substrates by permitting elemental diffusion, (2) interferes with the surface oxide formation that characteristically originates from the nickel-based metal alloy substrate, and (3) provides an appropriate oxide layer for porcelain application.
Alloys↗
Relining extension-base removable partial dentures.
Modern prosthodontic therapy must continue to address the inevitable consequence of tooth loss--that is, alveolar process atrophy. The use of removable partial dentures (RPDs) to treat partial edentia must rely, in part, on support from the ever-deteriorating edentulous ridges. Extension-base RPDs are particularly affected as the tissue-base relationship changes over time after extraction of the natural teeth. This article reviews the concept of observed changes in the residual edentulous alveolar ridge and conventional procedures used to compensate for this bone loss. Finally, a practical procedure is presented which uses convenient and accurate materials that can be readily incorporated into the modern dental practice.
Aged↗
Removable prosthodontic therapy and xerostomia. Treatment considerations.
Successful management of complete and removable partial dentures is complicated by a reduction in saliva. Dental practitioners should be aware of the signs and symptoms of xerostomia, available diagnostic procedures, likely etiologies, expected sequelae, and appropriate therapeutic regimens. Effective evaluation and appropriate treatment will promote acceptable levels of comfort and function. Over-the-counter (Figure 12) and prescription medications may be needed to improve the clinical situation.
Adult↗