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At least 1,585 records · Page 88Linked to original sources
PubMed2006

The Dahl principle: creating space and improving the biomechanical prognosis of anterior crowns.

There is an increased demand for restoration of anterior teeth based on esthetic requirements. Oftentimes, the teeth restored are compromised and have minimal remaining dentin after undergoing root canal treatment. Reduction of nonaxial forces by controlling incisal guidance is essential in improving the long-term prognosis of such situations. Another common complication when crowning anterior teeth is the lack of palatal space for restorative material. This is often evident in patients with anterior tooth wear and deep overbite. This article describes the Dahl principle, a conservative method for controlling incisal guidance and gaining palatal space for restorative material. A case presentation is used to illustrate the concepts discussed.

Aluminum Oxide↗
PubMed2006

Survival rates of IPS empress 2 all-ceramic crowns and fixed partial dentures: results of a 5-year prospective clinical study.

OBJECTIVE: The aim of this prospective clinical study was to evaluate the survival rates of IPS Empress 2 (Ivoclar Vivadent) all-ceramic crowns and fixed partial dentures (FPDs) after an observation period of up to 5 years. METHOD AND MATERIALS: Forty-three patients (19 women and 24 men) were included in this study. The patients were treated with a total of 58 adhesive bonded IPS Empress 2 restorations. A total of 27 single crowns were placed on molars and premolars, and 31 three-unit FPDs were placed in the anterior and premolar regions. Clinical follow-up examinations took place at 6, 12, 24, 36, 48, and 60 months after insertion. Statistical analysis of the data was calculated using the Kaplan-Meier method. RESULTS: Results of the 50-month analysis (interquartile range, 33 to 61 months) showed that the survival rate was 100% for crowns and 70% for FPDs. Six failures that occurred exclusively in the three-unit FPDs were observed. Framework fractures were recorded in three FPD units where the connector dimensions did not meet the manufacturer specifications. Only one FPD exhibited an irreparable partial veneer fracture, and 2 FPDs showed evidence of biologic failures. The accuracy of fit and esthetic parameters were clinically satisfactory for crowns and FPDs. CONCLUSION: The results of this 5-year clinical evaluation suggest that IPS Empress 2 ceramic is an appropriate material for the fabrication of single crowns. Because of the reduced survival rates, strict conditions should be considered before the use of IPS Empress 2 material for the fabrication of three-unit FPDs.

Adult↗
PubMed2006

After endo, what supports the crown?

There are two causes of common failures in posts and implants: retention and stress distribution. Implants that were smooth metal cylinders have today become threaded metal cylinders. By using one additional hand-operated instrument, the thread cutter and an additional five minutes of time, a rigid, threaded, metal post can be placed in the root canal to support the remaining coronal dentine. The tooth can frequently be rebuilt as a single unit or a bridge abutment to last for as long as the bone supports the root. To thread or not to thread, was that the question?

Crowns↗
PubMed2006

Veneer prep opinions.

Explore the source record for details and available documents.

Dental Prosthesis Design↗
PubMed2005

[Classification of premolars as a function of root anatomy and statistics].

The frequent endodontic failures on premolar teeth can be partly attributed to their complicated root canal anatomy. Anatomical studies were initiated almost a century ago by W. Hess, resulting in the actual meticulous classification. Vertucci was the first to describe in an exhaustive way the scores of anatomical variations by assigning them to 9 types. The Wein model is just as complete but offers a more clinical approach. It will be used as reference in this article to weigh the various statistics appearing in the anatomical studies on premolars.

Bicuspid↗
PubMed2005

[Premolar anatomy and endodontic treatment].

Endodontic failures on premolars are statistically important. This is mainly due to insufficient knowledge of the typical anatomical diversity shown by premolars. Filling a second root canal is often omitted. Completely treating a complicated root canal system is technically quite difficult which results in a relatively high level of endodontic failure. There are not only the classical technical problems to deal with: calcification of the root canals and delicate probing, given the frequently bent and twisted premolar roots; special attention should also be given to upper premolars with three root canals and those showing a high bifurcation of a principal root canal (configuration IV), and to lower premolars with multiple root canals often showing configuration IV. An additional problem associated with the second lower premolars is a hazardous anatomical zone: the mandibular vasculonervous plexus of the chin.

Bicuspid↗
PubMedDate not supplied

Laboratory communication for restorative excellence.

Excellence in restorative dentistry requires teamwork between the patient, dentist, and laboratory technician. This can occur only when there is mutual trust and respect. Many years ago (and in some cases still today), the technician was denigrated and also blamed for the lack of excellence in fit, occlusion, and shade. All of these problems can be avoided by sharing in the diagnosing and planning of a restorative case. Major differences will result when this occurs and all parties will benefit.

Communication↗
PubMed2006

Adopting a new philosophy: minimal invasion.

Dentistry is a dynamic profession with new trends evolving. Minimally invasive dentistry is becoming not just a concept but a way of practicing. Creative people are finding ways, materials, and technology that enable patients to experience less hard-tissue or soft-tissue removal, improved prevention and maintenance, and increased attention to a philosophy of "less is more." The World Congress of Minimally Invasive Dentistry was formed to facilitate the sharing of these new concepts. The members embrace change, and dentistry offers the constant opportunity for such. As the standard of care moves toward minimally invasive dentistry, patients will benefit.

Bone Transplantation↗
PubMed2006

Treatment planning and smile design using composite resin.

UNLABELLED: Recent advances in dental materials and adhesive protocols have expanded the restorative procedures available to today's clinicians. Used in combination with proper treatment planning, these innovations enable dental professionals to provide enhanced aesthetic care that achieves the increasing expectations of their patients. Using a case presentation, this article will document the steps required to harmoniously integrate smile design, material selection, and patient communication that are involved in the provisional of aesthetic dental care. LEARNING OBJECTIVES: This article discusses the utilization of composite resin as a tool to enhance the patient's smile. Upon reading this article, the reader should: Become familiar with a smile-enhancing technique which can be completed in one office visit. Realize the benefits that intraoral composite mockups offer in terms of prototyping and confirming patient satisfaction.

Acid Etching, Dental↗
PubMed2006

The clinical relevance and correlation between the initial straight length to the first curvature in human second maxillary premolars.

The aim of this study was to evaluate the straight lengths of the root canal of human second maxillary premolars using standardized radiological techniques in vitro. The distances were examined starting from the cemento-enamel junction (CEJ) to the appearance of a curvature. In particular recommendations which may facilitate decision making with regard to the length of post systems after successful endodontic treatment should be available. Extracted human second maxillary premolars (n = 210) were used; teeth with root caries, artificial crowns, extensive fillings or with previous endodontic treatment were excluded from this investigation. The teeth were fixed in a specially developed device with standardized and reproducible distances and digital radiographs using the parallel technique were made. A descriptive statistical analysis and the calculation of the cumulative frequencies were made. The values for the distance starting from the CEJ to a first curvature were as follows: a) For right second premolars: median value=10.3 mm (min.: 5 mm; max.: 15.8 mm) and mean value= 10.4 SD+/- 2.6 mm; b) left second premolars: median value =10.2 mm (min.: 5 mm; max.: 17 mm) and mean value =10.3 mm SD +/-2.2 mm. Based on our data, high number of second maxillary premolars showed a curvature (30.4%) 9 mm apically from the CEJ. These findings should be taken into consideration for endodontic treatments and post insertions.

Bicuspid↗