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[Characteristics of domestically produced siloxane elastomer for making elastic gingival prosthetic device].
Gingival prosthetics effectively eliminates esthetic and phonetic disturbances in cases of pronounced gingival recession. Technology for making elastic gingival prosthetic devices of domestically produced siloxane elastomer composition with microwave siloxane vulcanization is described as well as the technique for making combined gingival prosthetics of siloxane composition and colorless plastic.
Building the edentulous impression--a layering technique using multiple viscosities of impression material.
The purpose of this article is to introduce a novel impression technique. The procedure demonstrates a building, or layering, method of impression making that maintains the integrity between layers of the impression materials of varying viscosities and controls the path of insertion, minimizing the incidence of overextension. To build a detailed impression of the tissue-bearing surfaces, the clinician selects the proper viscosity of impression material based on the diagnosed tissue condition.
Surface detail reproduction of Type IV dental stones with selected polyvinyl siloxane impression materials.
Four polyvinyl siloxane impression materials and 14 modified Type IV dental stones were evaluated for their abilities to reproduce surface detail. Each combination of impression material and dental stone was used to duplicate a 20-microns-wide line. Surface detail reproduction was observed by two paired-rater groups. The line was reproduced in all impression material specimens, but in only 32% of the stone cast specimens. Some combinations of impression material/dental stone reproduced the line all or most of the time, but 12 combinations did not reproduce the line at all.
Before the die is cast.
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[Full porcelain partial crown. 2. Preparation].
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Dual-arch and custom tray impression accuracy.
This study compared the accuracy in three dimensions of casts made from complete-arch custom acrylic resin trays and two types of dual-arch impression trays. Using addition silicone impression material, 30 impressions (10/group) were made of a typodont. Reference marks on the typodont allowed measurements in the mesiodistal, buccolingual and occlusogingival dimensions. Gypsum casts were made and the distances between the reference marks on each cast were determined with a measuring microscope. The measurements from each cast were compared with one another and expressed as a percent deviation from the typodont measurements. Analysis with a two-way ANOVA and a Tukey B post hoc test established that the dual-arch trays were at least as accurate as the custom tray in every dimension measured.
[The making of fireproof dies with the duplicating system according to Rath].
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The accuracy verification stent (AVS) technique.
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[Porcelain veneers: construction technique].
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Determination of an optimal magnification for examining voids in elastomeric impressions.
Specimens of one polyether impression material and the resulting stone casts were examined at magnifications from 1X to 10X to determine the optimal magnification for identifying defects. Results showed that the number of defects on impressions and stone dies detected by two operators increased with each corresponding increase in magnification up to magnifications of 9X and 8X, respectively. The magnifications that revealed significantly less defects than the highest mean count were 6X for impression voids and 5X for stone die defects. A magnification of 9X optimized reliability by maximizing void detection while minimizing operator variability.
Relationship between critical convergence angle and surface defects in stone casts.
Surface defects on stone casts threaten the accuracy of cast restorations. The aim of this study was to examine the relationship between critical convergence angle and voids in stone casts. Three addition silicone materials, one condensation silicone material, and one polyether impression material were used. The highest convergence angle at which voids presented at the tip of the specimens was recorded, and the number of voids found at margins and line angles of the tooth preparations were counted. Results showed a positive and significant correlation between the critical convergence angle and the number of voids at margins and line angles of stone casts. Casts poured from polyether impressions registered significantly lower critical convergence angle values and presented with fewer voids than did those fabricated from silicone materials.
[Protocol for evaluation of candidates for osseointegrated implants].
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[Fabrication of removable dies].
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[Angle reproducibility and surface roughness of stone casts obtained from combined agar-alginate impressions].
Angle reproducibility and surface roughness were compared among stone casts obtained from two agar-alginate impression methods; 1) conventional method in which an alginate mix was applied before gelation of agar, and 2) improved method in which an alginate mix was applied to gelled agar. Impressions of the rectangular parallel piped metal mold with a high accurate point angle was taken according to the above methods, and stone casts were obtained. Enlarged images of the angles of the casts were projected with an optical projector, and the defects of the point angle were traced. The area, the length and the circular-degree coefficient of the defects were determined using an image analysis system. The surface roughness of the stone casts was also measured. The stone casts prepared by the improved agar-alginate method had better angle reproducibility and the same surface roughness as that prepared by the conventional method.
[New indirect method of orthodontic bracket application].
The latest improvements in orthodontic materials need an extremely accurate placement of brackets on the teeth. Such degree of precision, hardly obtainable with normal technique, led to develop many indirect techniques of bracket bonding: they had however many defects, limiting the clinical use such as: 1) impossibility to remove accurately the bonding excess from the tooth; 2) difficulty to control the accuracy of the applied system. The availability of brackets with individual height measuring devices made it possible to develop a new technique, actually in use at the Orthodontic Department at the Boston University directed by prof. A. Gianelly. The description of the technique shows the simplicity of the needed steps. The kind of acrylic splint allows to: 1) verify the accuracy of the system during the application; 2) absolutely control excess of bonding used during brackets application on the teeth. The advantages deriving from the use of this technique are principally: 1) the precision of placement of brackets on the teeth 2) the shortening of the time needed with the patient in the dental office.
[Setting expansion of dental stone in hydrophilic addition type silicone impression].
The setting expansion of a dental stone poured in addition silicone impression materials was evaluated. Impressions were made of two different addition silicones (hydrophilic and hydrophobic) that had three different consistencies (injection, regular and putty). A dental stone which did not contain any additives was poured in the impressions and the setting expansion of the stone was automatically measured using an electric micrometer and a computer. The setting expansion of the stone that was poured in the impression did not significantly vary with the consistency of the silicones. On the other hand, the setting expansion of the stone in the hydrophilic silicone was significantly larger than that in hydrophobic silicone.
[Volume estimation of non-caries related enamel defects].
The volume of wedge shaped defects can be estimated by means of massa suppositoriorum on a plaster cast. The substance are pressed in a graduated pipette. The average relative error is six percent. The absolute error of defects of 2.0, 10.0 respectively 20.0 mm3 ranges from 0.12, 0.6 to 1.2 mm3.