Repositioning implant replicas after soldering a fixed complete denture framework.
Explore the source record for details and available documents.
Dental Implants↗
Biomedical subjects
Konstantinos X Michalakis
Publications and source records attributed to Konstantinos X Michalakis.
Optical behavior of current ceramic systems.
The restoration of anterior teeth is a difficult task, even for an experienced operator. Currently there are many different ceramic systems that can be used to achieve highly esthetic results. These include metal-ceramics with porcelain margins, Dicor, In-Ceram, Cerestore, Hi-Ceram, IPS-Empress, Cerapearl, Optec, and CAD/CAM ceramics. While metal-ceramics have been used for more than four decades, the quest for a material that transmits and refracts light like a natural tooth has inspired research into all-ceramic restorations. The purpose of this paper is to briefly discuss the properties of each of the above-mentioned materials and clinically evaluate the optical behavior of: (1) metal-ceramic crowns with castings 2 mm short of the shoulder preparation and 360-degree porcelain margins; (2) In-Ceram Spinell restorations; and (3) IPS Empress restorations, and to compare these with metal-ceramic crowns with copings to the shoulder preparation and 180-degree porcelain margins. Light transmission characteristics and color matching were subjectively evaluated by five experienced prosthodontists who did not participate in this clinical study.
Aluminum Oxide↗
A simple impression technique for dental implants placed in close proximity or adverse angulations.
This article presents a method for overcoming difficulties associated with the impression procedures for implants placed in close proximity or with adverse angulations, which make the placement of the impression copings problematic.
Dental Implantation, Endosseous↗
Fabrication of a metal-ceramic fixed partial denture using the prosthetic components of an unidentified implant system.
Explore the source record for details and available documents.
Dental Prosthesis, Implant-Supported↗
An experimental study on particular physical properties of several interocclusal recording media. Part I: consistency prior to setting.
PURPOSE: To evaluate the consistency prior to the setting of 5 elastomeric interocclusal recording materials in comparison with a wax and a zinc oxide-eugenol paste. This property is related to the viscosity as well as to the working and setting times of these materials. MATERIALS AND METHODS: Testing of consistency was performed following a modification of the method described in ADA Specification No. 19, for elastomeric impression materials. Each one of the tested materials was mixed for 20 seconds and was then loaded into a 0.5 mL syringe. The material was syringed onto a 10 x 10 x 0.5 cm glass plate. A second 575 g glass plate was placed on top of the unset interocclusal registration material. A total of 10 samples were tested for each material. The surface area covered by the materials was measured with the help of a scanner and the use of appropriate computer software. RESULTS: One-way ANOVA revealed significant differences among the materials (F = 889.493, p < 0.0005). According to Tukey's honest significant difference test, all materials were significantly different (p < 0.05) from one another. All polyvinylsiloxanes occupied a smaller area than that of the polyether and of the zinc oxide-eugenol paste. CONCLUSIONS: Zinc oxide-eugenol paste was the most fluid of all materials tested. Polyvinylsiloxanes displayed less flow properties than polyether.
Analysis of Variance↗
An experimental study on particular physical properties of several interocclusal recording media. Part II: Linear dimensional change and accompanying weight change.
PURPOSE: The purpose of this study was to evaluate the linear dimensional change and accompanying weight change of several elastomeric interocclusal recording media. MATERIALS AND METHODS: Ten 50 mm long, 8 mm wide, 3 mm deep Teflon molds and a stainless steel die were constructed for the purposes of this study. The die was made in order to produce standardized reference lines, which were used for the measurement of the linear change. After homogeneous mixing, each material was carried from the mixing pad or directly from the mixing tip to the Teflon mold. The mold was inverted onto the stainless steel die. The materials were allowed to set for the manufacturers' suggested setting time plus an additional 3 minutes to ensure polymerization of the material. An electronic scale (Galaxy 110, Ohaus, Pine Brook, NJ) was used for the measurement of the weight change of the specimens and a traveling micrometer microscope (Griffin Ltd., London, England) was used to measure the linear changes at 5 time intervals: 0, 1 hour, 24, 48, and 72 hours. RESULTS: Analysis of variance for a significance level of 5% revealed that there was a statistically significant effect of the "material" factor on the weight changes (F= 2,229.98, p < 0.0005). There was also a statistically significant effect of the "time" factor on the weight changes (F= 2,332.04, p < 0.0005). Descriptive statistics and Tukey's Honest Significant Difference Test revealed that the elastomeric material with the greatest weight changes is polyether (Ramitec). Analysis of variance for a significance level of 5% revealed that there is a statistically significant effect of the "material" factor on the linear changes (F= 215.54, p < 0.0005). There is also a statistically significant effect of the "time" factor on the linear changes (F= 1,996.01, p < 0.0005). Descriptive statistics and Tukey's Honest Significant Difference test revealed that the elastomeric material with the smallest linear changes is polyether (Ramitec). CONCLUSIONS: Of all materials tested, Ramitec (polyether) presented the smallest linear change at all time intervals. Addition reaction silicones presented statistically significant differences in recordings of linear changes among them only at the 1st and the 24th hour. Linear changes did not seem to be associated with weight changes.
Analysis of Variance↗
An experimental study on particular physical properties of several interocclusal recording media. Part III: resistance to compression after setting.
PURPOSE: The purpose of this study was to evaluate the resistance to compression after setting of several elastomeric interocclusal recording materials. MATERIALS AND METHODS: Testing of the resistance to compression after setting was performed following a modification of the method described in specification No. 19 (4.3.6) of the A.D.A., for the elastomeric impression materials-1 cylindrical stainless steel mold with an internal diameter of 20 mm and a height of 20 mm was constructed. Mixing of the interocclusal registration media was conducted according to manufacturers' instructions, and the materials were injected into the mold. Two subsequent loads, one of 100 g/cm2 and a second of 1000 g/cm2 were exerted on each sample. The deformation of each was calculated using a vertical traveling micrometer microscope with an accuracy of +/- 0.001 mm. RESULTS: One-way ANOVA revealed significant differences among the materials (F=331.58, p <0.0005). Tukey's HSD (p <0.05) test was used to determine the significant differences between the materials. CONCLUSIONS: Polyvinylsiloxane Blu Mousse displayed the greatest resistance to compression, as compared to other elastomeric interocclusal recording materials tested.
Analysis of Variance↗
Light transmission of posts and cores used for the anterior esthetic region.
Restoration of endodontically treated teeth is a routine procedure in everyday clinical practice. Placement of posts and cores is often required for replacement of the missing coronal aspect of teeth. Use of traditional post-and-core systems (gold and titanium) in conjunction with all-ceramic restorations results in poor esthetics because of the reflection and lack of light transmission. For a highly esthetic outcome, there is a need to use a material that transmits and refracts light in much the same manner as a natural tooth. The purpose of this study was to clinically evaluate the light transmission of a (1) ceramic post (Celay), (2) polyester post reinforced with zirconium fibers (Snowlight), and (3) zirconia post (Cosmopost), in comparison with a cast-metal post and core covered with opaque porcelain (control). The light transmission of these systems when used in conjunction with IPS Empress all-ceramic crowns was evaluated.
Aluminum Silicates↗
Fixed rehabilitation of an ACP PDI class III patient.
This clinical report documents the treatment of a 63-year-old Caucasian female Prosthodontic Diagnostic Index Class III patient using dental implants and a fixed prosthetic reconstruction. The treatment involved the fabrication of single crowns and fixed partial dentures retained by natural teeth in the maxillary arch. The posterior segments of the mandibular arch were rehabilitated with fixed partial dentures retained by endosseous implants.
Dental Implants↗
Cement-retained versus screw-retained implant restorations: a critical review.
This article presents a comparison of screw-retained and cement-retained implant prostheses based on the literature. The advantages, disadvantages, and limitations of the 2 different types of restorations are discussed, because it is important to understand the influence of the attachment mechanism on many clinical aspects of implant dentistry. Several factors essential to the long-term success of any implant prosthesis were reviewed with regard to both methods of fixation. These factors include: (1) ease of fabrication and cost, (2) passivity of the framework, (3) retention, (4) occlusion, (5) esthetics, (6) delivery, and (7) retrievability. (More than 50 references).
Cementation↗