Libros

Purpose: The purpose of this retrospective study was to review and assess the outcomes of subjects treated with dental implants at the University of Washington Graduate Prosthodontic Program from 1988 to 2000. Materials and Methods: A retrospective review and an outcomes assessment were conducted of patients treated with osseointegrated implants between 1988 and 2000 at the University of Washington Graduate Prosthodontic Program. Patients were treated by graduate students. All included patients had a prosthesis that had been in service for at least 5 years. Implants and prostheses were assessed by chart review, phone survey, and clinical review. Clinical review consisted of mobility testing, soft tissue evaluation, and occlusal evaluation. Specific success criteria were used and life table analyses of implants and prostheses were performed. Results: Of a total of 114 patients treated, 69 subjects (60.5% of those treated) participated in the assessment; 103 prostheses supported by 273 implants were reviewed clinically. The estimated cumulative survival rate was 96.3% for all implants and 85.4% for all prostheses. Conclusions: A retrospective review of 69 subjects who were treated in the University of Washington Graduate Prosthodontic Program between the years 1988 and 2000 showed an implant survival rate of 96.3% and a prosthesis survival rate of 85.4%. Prostheses showed higher failure rates than implants. Palabras clave: cumulative survival rate, dental implants, implant prostheses, osseointegration

Ziel der Untersuchung war festzustellen, ob Frontzahnkronen auf Grundlage eines computergestützten Farbnahmesystems besser zu den Nachbarzähnen passen als auf Grundlage von konventioneller Farbrezeptur und klinischen Diaaufnahmen (Kontrollmethode). 5 Patienten mussten im Bereich der oberen mittleren Schneidezähne mit einer Krone versorgt werden. In allen Fällen wurden 2 Metallkeramikkronen hergestellt - eine davon nach der Studienmethode, die andere nach der Kontrollmethode. Die Reihenfolge der Methoden wurde nach dem Zufallsprinzip ausgewählt und die jeweilige Behandlungsdauer dokumentiert. Die einzelnen Kronen wurden im Doppelblindverfahren einprobiert und danach auf Farbgleichheit mit den Nachbarzähnen untersucht. Palabras clave: Computer, Farbnahme, Keramik, klinische Studie, Kronen, ShadeScan

Objective: The purpose of this study was to determine whether anterior crowns fabricated using a computerized shade selection system (ShadeScan, Cynovad) (experimental procedure) match adjacent teeth better than anterior crowns fabricated using conventional shade prescription and clinical slides (control). Method and Materials: Five subjects who required a crown to restore a maxillary central incisor were selected. Two metal-ceramic crowns were fabricated for each incisor, 1 using the experimental procedure and 1 using the control method. The shade selection method to be used for the first and second crowns was randomly assigned. The duration of each procedure was recorded. Each restoration was tried-in in a double-blind manner and evaluated for its level of match to adjacent teeth using modified Ryge criteria. Data were analyzed within each subject using descriptive statistics and paired t test (alpha = .05). Results: In 40% of the cases, both procedures did equally well. In the remaining 60% of the cases the control procedure (two-thirds of the cases) performed better than the experimental procedure (one-third of the cases). Duration of the control procedure was 14.4 ± 5 minutes, and the experimental procedure was 5.2 ± 3.3 minutes. A paired t test showed the difference was significant (P = .0045). Conclusion: The level of matching of crowns fabricated with the ShadeScan system was not different from crowns fabricated using the control. However, it took significantly less time to record the shade with the ShadeScan system. Palabras clave: ceramics, clinical study, computers, crowns, ShadeScan, shade selection

Die optischen Eigenschaften einer per CAD/CAM hergestellten Gerüstkappe aus dicht gesintertem Aluminiumoxid ermöglichen ein Maskieren von Metallpfeilern selbst bei beengten Platzverhältnissen. Eine zervikal reduzierte Aluminiumoxid-Gerüstkappe wird zwar nicht häufig benötigt, doch zeigt dieser Artikel für den Fall der Fälle eine einfache Technik zur Herstellung einer solchen reduzierten Gerüstkappe auf, bei der die Vorteile der industriell hergestellten Gerüstkappe nach wie vor voll zum Tragen kommen. Palabras clave: Frontzahnkronen, Platzproblem, dicht gesinterte Gerüstkappe, Farboptimierung, Passgenauigkeit

Because of their unique radicular anatomy, mandibular molars require careful treatment planning for post-and core fabrication. Indications for post-and-core fabrication for endodotiticaliy treated mandibular molars are discussed, and immediate and cast post-and-core techniques are reviewed. An alternative design for a cast post and core is also presented. (Quintessence Ini 1998:29:351-355)