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At least 1,117 records · Page 62Linked to original sources
PubMed2005

Occlusal changes in complete dentures processed by pack-and-press and injection-pressing techniques.

Ten pairs of stone casts were mounted in an articulator using a standardized maxillomandibular relation, on which trial dentures were constructed. Two groups were established: GI- pack-and-press technique; GII- injection-pressing technique. Intermaxillar contacts were marked and counted, and the contact between incisal pin and incisal table was measured, before and after the processing. The average contact loss after the processing was 37.85% (GI) and 20.8% (GII). The average incisal pin opening after the processing was 1.3mm (GI) and 0 (GII). Data differed statistically (Mann-Whitney's test, p < 0.05). The injection-pressing system was superior according to contact loss and incisal pin opening.

Acrylic Resins↗
PubMed2005

In vitro human enamel wear by a hydrated high-alkali porcelain.

OBJECTIVE: The purpose of this study was to examine the hydration of a high-alkali dental porcelain (Ducera LFC) and its relative abrasive wear against human enamel. The hypothesis is that the composition of the porcelain (LFC) will form a softer, hydrated layer in artificial saliva, which will reduce wear against enamel relative to other dental porcelains. METHOD AND MATERIALS: The first experiment was to estimate the thickness of the hydrated layer formed on LFC by storage in artificial saliva using microindentation hardness. The second experiment involved an estimate of enamel wear relative to other porcelains (d-Sign, LFC, Ducera Gold, and the control substance, Ceramco II) of hydrated LFC using a pin-on-disk wear test. RESULTS: The mean microindentation hardness values of hydrated and unhydrated LFC and the Ceramco II control were 5750 Mpa, 8230 Mpa, and 7180 MPa, respectively, at a stylus depth of 400 nm. The average enamel wear values measured with the porcelains are (in microns): LFC saliva (hydrated), 23.8; d-Sign, 35.6; LFC, 59.4; Ducera Gold (hydrated), 75; Ducera Gold, 81.3; Ceramco II, 109.4. Using Tukey's analysis at a 5% error level, there were significant differences between the wear of enamel against hydrated LFC and the more abrasive Ceramco II control. CONCLUSION: Comparing the effect of hydration of LFC on enamel wear, using an independent t test, hydrated LFC was significantly less abrasive than LFC (P< .008), but was not significantly less abrasive than d-Sign.

Dental Enamel↗
PubMedDate not supplied

Prospective clinical trial comparing lingualized occlusion to bilateral balanced occlusion in complete dentures: a pilot study.

PURPOSE: The aim of this prospective comparative trial was to evaluate whether patients treated with complete dentures with lingualized occlusion (LO) exhibited more positive results than patients treated with complete dentures with bilaterally balanced occlusion (BBO). MATERIALS AND METHODS: Twenty-eight completely edentulous patients, ranging in age from 60 to 82 years (mean age 70.9), consented in writing to be participants in this trial. The first 14 patients enrolled in the study protocol were treated with complete dentures with LO, and the next 14 patients were treated with complete dentures with BBO. Baseline characteristics were measured prior to the trial. Main outcome variables involved subjective outcomes of general satisfaction, ability to masticate, and stability and retention of the prostheses; these were quantified with a 100-mm visual analog scale. Objective outcomes were masticatory performance and the number of adjustments. Statistical assessments of the 2 groups were compared using multiple linear regression analysis. The baseline characteristics were analyzed by Student t test and chi-square test. RESULTS: There were no significant differences between the groups at baseline. The height of the alveolar ridge exhibited significant correlations with masticatory performance (P = .02). The occlusal scheme exhibited a significant correlation with only the patient's retention satisfaction rating (P = .03). CONCLUSION: Despite limitations of this study attributed to the small sample size and lack of randomization, this pilot study found that edentulous patients fitted with complete dentures with LO experienced and expressed greater satisfaction with their denture retention. In addition, it was observed that a higher alveolar ridge resulted in greater masticatory performance.

Aged↗
PubMed1991

Implant-retained precision two-stage single-tooth replacement.

The restoration of an anterior edentulous space due to a congenitally missing lateral incisor presents the dentist with a restorative challenge. Treatment of a young patient requires that the restoration be conservative as well as esthetic. This article presents the rationale for use of an osseo-integrated implant to support a single-tooth restoration. The final result was esthetic, functional, and promoted a healthy periodontium.

Adult↗
PubMed2006

Design and use of a prefabricated fiber-reinforced composite substructure for the chairside replacement of missing premolars.

Fiber-reinforced resin composites (FRCs) have been used to make frameworks to support particulate resin composite veneers in the replacement of missing teeth. Both prosthetic laboratory-fabricated and chairside-fabricated approaches have been used with varying degrees of success. The chairside FRC fixed partial denture has been mainly used for anterior tooth replacement where the emphasis is on esthetics rather than withstanding occlusal load. This article focuses on the use of this technology in the chairside replacement of premolars. The concept of using a prefabricated framework is described in detail. This approach allows for the efficient delivery of a consistently made chairside prosthesis. This is in contrast with the time-consuming and less consistent result of FRC framework fabrication directly in the mouth. The goal for this concept is to use a premade framework finalized by the provider at chairside to provide medium- to long-term posterior tooth replacement, with minimal abutment tooth reduction.

Adult↗
PubMed2006

Chromatic appreciation in the clinic and the laboratory.

Aesthetic requirement in dentistry is getting more and more important every day. One of its basic principles is the correct selection of colour for the restorations. Colour is a quality which is modulated by a series of factors, environmental and individual, that the clinic must know. Colour measurement by the human eye can induce to an appreciation mistake if it doesn't follow a correct protocol of light conditions and observation technique, checked by the authors, simplifying it with a practical focusing. Colour measurement instruments have appeared recently, trying to correct the problems of conventional technique.

Dental Materials↗
PubMed2006

[Comparative analyses of colonization degree of oral cavity by microbial flora during application of teeth prosthetic devices].

The degree of adhesion and colonization was studied among 27 patients with generalized paradontitis of moderate severity and in remission stage. All these patients had different material teeth prostheses. 12 patients had acrylic plastic "Ftorax" material prostheses and 15 of them polypropylenes prostheses. Prostheses prepared from acryl plastic were intensively colonized by stable microflora of oral cavity, as well as by paradontopathogens, whereas usage of polypropylenes prostheses is rather effective for patients with paradontitis, because it is followed by partial recovery of stable microflora and lack of secretion of parodontopathogenic types, such as actynomycetes, prevotellae, fusobacteria.

Bacterial Adhesion↗
PubMedDate not supplied

Technique for placement of a posterior prefabricated fiber-reinforced composite bridge.

Fiber-reinforced composite (FRC) materials currently are used as alternatives for fixed restorations of edentulous areas within the posterior and anterior regions of the mouth. A chairside technique, using a prefabricated FRC framework, allows the clinician to offer the patient another fixed option for replacing a missing posterior tooth that is more time-efficient and cost-effective than other, more traditional approaches. Procedures that incorporate adhesive dentistry give dentists the ability to replace missing teeth and splint unstable teeth for periodontal or orthodontic purposes. This article demonstrates the sequence and chairside technique for placing a prefabricated FRC framework to restore a posterior edentulous area.

Cementation↗
PubMed1990

[Properties of experimental high abrasion resistance plastic teeth].

High abrasion resistance plastic teeth made of microfilled urethane dimethacrylate resin were developed around ten years ago. In recent years, several of this same type of resin teeth were developed and introduced commercially in Japan. Many studies have reported the properties of restorative resin materials, but few comparative studies have been conducted among the various resin teeth on the market. The purpose of this study was to compare the basic physical properties of conventional acrylic resin teeth as dental materials with an experimental high abrasion resistance plastic for posterior teeth made of microfilled urethane dimethacrylate. In addition, we compared the properties of the experimental teeth with the other high abrasion resistance plastic teeth including a comparative study of anterior and posterior teeth already on the market. The results indicated that basic physical properties of the experimental posterior resin teeth were better than those of the conventional acrylic resin teeth, but the staining resistance of the former was a little lower than that of the latter. Further, the experimental posterior teeth appeared to have physical properties equal to those of other resin teeth of the same type, but the staining resistance of the experimental resin teeth was higher.

Acrylic Resins↗