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At least 1,045 records · Page 58Linked to original sources
PubMed1990

Microleakage of interim endodontic filling materials.

This study compared four interim endodontic filling materials for microleakage. Forty extracted premolars were prepared for first appointment endodontic therapy. Each tooth was filled with one of four materials, thermocycled, placed in basic fuchsin dye, sectioned, and photographed. Ketac-Silver showed virtually no leakage; IRM exhibited leakage ranging from minimal to the depth of the dentin; Term had leakage ranging from slight to the depth of the pulp; gutta-percha exhibited leakage in the various samples from deep dentin penetration to pulp chamber penetration. Ketac-Silver demonstrated superior sealing qualities compared to the other three materials. The gutt-percha was remarkably inferior to the other materials.

Dental Leakage↗
PubMed1990

[Pigmentation of the oral mucosa from endodontic materials].

The Authors describe the clinical case in which a 30 years old male patient presents anomalous pigmentation of the oral mucosa after the endodontic treatment of the upper right central incisive. The mucosa's anomaly appeared at the height of the lower third of the root near the branch of an accessory endodontic canal previously filled and it was caused by the outlet of filling material. After the examination of this case, the Authors affirme the importance of an accurate anamnesis in order to obtain a correct diagnosis of the various kinds of pigmented lesions, distinguishing the etiology, the pathogenesis and the histologic patterns.

Adult↗
PubMed1990

Endodontic mishaps: etiology, prevention, and management.

Root canal therapy consists of a cascade of scientifically-based technical procedures. Lack of knowledge, its poor application, or a compromise or a break in the chain of proper procedures can lead to a number of accidents which are collectively called 'endodontic mishaps'. These accidents can occur during diagnosis, access preparation, cleaning and shaping, obturation and post-space preparation. Those who perform root canal therapy must have a basic knowledge of etiologic factors and methods of prevention as well as recognition, management and prognosis. This knowledge reduces the rate of endodontic failures and increases our chances of saving more teeth.

Dental Cavity Preparation↗
PubMed1990

Endodontic file design and dynamics in automated root canal preparation. Concepts, materials and methods.

Many treatment failures in endodontics are caused by problems that occurred during canal preparation. This article reviews principles of endodontic instrument design and analyzes the design as it relates to an automated handpiece. After a review of the problems of automation, there will be an introduction of a new automated handpiece and a new modified file known as the Anticurvature File.

Equipment Design↗
PubMed1990

Work study on endodontic treatments by means of practice administration.

Work analysis by means of dental practice administration is necessary for every clinical dentist. Generally speaking, endodontics sometimes may ignore the study of the operator's difficulties and/or the patient's time burden. Two dentists had treated 72 teeth on 49 patients with single visits in endodontics in one month. Vital and infected canal treatment needed almost the same working time in our clinical system. Difficult cases and work factors affect working time longer and make the standard deviation larger. Difficulties had caused incisor work to consume more time than premolar treatments. In the case of molars, clinical experience helped treatment on maxilla to be quicker than on mandible. Knack factors were to be revealed in this qualitative study.

Humans↗
PubMed1990

An update on endodontics: 2. File manufacture and obturation techniques.

In recent years manufacturers have responded to an increase in endodontic treatments by developing a number of new products. New techniques have also been introduced. In this two-part article the author critically reviews these developments. In Part 1 he looked at diagnosis of endodontic problems and at root canal preparation techniques. In Part 2 he now examines file designs together with techniques for root canal obturation.

Gutta-Percha↗
PubMed1990

The emerging role for lasers in endodontics and other areas of dentistry.

This article focuses on the emerging role of lasers in endodontic therapy, a discipline where lasers could significantly change the way we practice. The use of the CO2 laser in caries prevention therapy and laser etching is also discussed to illustrate how the same laser can be used for other important procedures in dental practice by simply varying the exposure parameters. Lasers will have a definitive place in dentistry in the future, but to be practical, one dental laser will have to be applicable to a number of therapeutic procedures. This article discusses just such a situation relating to a wide variety of endodontic procedures, caries preventive procedures, and laser etching of enamel. Due to its very favorable absorption on dental hard tissues, the CO2 laser will also undoubtedly be useful for many other procedures in dental practice.

Carbon Dioxide↗
PubMed1990

[Endodontic treatment in the therapy of alopecia areata].

In the aethiology of some rheumatic, cardiovascular, ophtalmologic and dermatologic the important role is attributed to dental focus, i.e. to periapical lesions as a very frequent endodontic pathosis. The purpose of this article was to describe a patient with Alopecia areata, to analyse the role of dental focus and to point out the importance of endodontic treatment in the therapy of this dermatologic disease.

Adult↗
PubMedDate not supplied

[Post and core for endodontically treated teeth].

The literature is replete with the various techniques used in the restoration of pulpless teeth. Controversies surround the most clinically successful procedures and general dentist is confronted daily with the dilemma of choosing the best treatment modality. Endodontically treated posterior teeth present restorative problems. The remaining tooth tissue requires special treatment to prevent further destruction. This report presents an effective method for succeeding extension and protection for endodontically treated teeth. The advantages of the post-core system against other types of restoration, as well the indications are reviewed. In this paper the preparation of the tooth and the construction of a post-core by the direct and indirect method are described.

Humans↗
PubMed1990

Investigation of DNA reactivity of endodontic agents by rec-assay.

Eight endodontic agents were tested for their reactivity with DNA by the rec-assay system. Employing 2 strains of Bacillus subtilis with different recombination capacities, the assay suggested that DNA damage is produced by agents for root canal cleaning containing sodium hypochloride. Other endodontic drugs, including disinfectants for caries cavities, sedatives for pulp, root canal disinfectants, and pulp devitalizing agents containing phenol, camphor, tricresol, formalin, and paraformaldehyde were also positive by rec-assay and would seem to potentially of damage cellular DNA in Bacillus subtilis. Though no clear evidence exists that drugs showing positive results by rec-assay induce malignant tumors in the oral region, these agents should be used carefully since they would seem to possibly cause genetic toxicity in mammalian cells.

Camphor↗
PubMed1990

[Subjectivity in interpretation of radiographs in endodontics].

This research found a substantial interobserver disagreement existing in endodontic success/failure interpretation from periapical radiographs. The diagnostic variability appears to be independent of the anatomic location of the endodontically treated tooth (even though it seems less for mandibular teeth), as well as it appears to be independent of the time interval between post-operative and recall radiographs. Extremely significant has also been the fact that an important percentage of observers have contradict themselves in the interpretation of the same radiograph.

Adult↗
PubMed1990

[Morpho-functional characteristics of bacterial species of major importance in endodontic infections].

Most of the bacteria involved in the endodontic infection can be considered as "highly specific", for they appear to be almost irrelevant in the large field of the other human disease from infection. Namely the most important anaerobia responsible for endodontic infection are: Bacteroides, Fusobacterium, Peptostreptococcus, and Veillonella. The group of Bacteroides is composed by several species with different metabolic and genetic characteristics. They are Gram-, non-motile, non-spore-forming rods. Fusobacterium are spindle-shaped, Gram-, non motile, non-spore-forming bacilli. Peptostreptococci are round-shaped, Gram+, non-motile cocci. Veillonella are small, Gram-, non-motile cocci.

Bacteria, Anaerobic↗
PubMedDate not supplied

[Study of some physical and biological properties of an endodontic sealer composed of calcium hydroxide].

The authors present a study of the physical and biological properties of a new endodontic cement known as Sealapex. In its composition the presence of calcium hydroxide is introduced in order to induce calcification of the periapical tissue. Our results using glass round cover slips implanted on the subcutaneous tissue of mice indicated a persistent foreign body reaction (60 days). The physical properties studied compared to N-Rickert ciment indicated, a decreased leakage. Adhesivity tests didn't give us significant values. Laboratorial studies and clinical trials are necessary to a complete acceptance of this new ciment in endodontic treatment.

Animals↗
PubMedDate not supplied

[Endodontically treated teeth. Success--failure. Endorestorative treatment plan].

More and more often the general dentist is finding the presence of endodontically treated teeth during his treatment planning procedure. He has to ask himself if the endo-treated tooth functions and will continue to function function successfully, when deciding which final endo-restorative procedure to apply. For this reason the dentist or the endodontist with whom he works should clinically evaluate these teeth, establish a diagnostic criteria of their success or failure and a treatment plan according to the prognosis. The purpose of this article is to offer an organized clinical view of the steps to follow when evaluating an endodontically treated tooth and how to establish a final endo-restorative plan.

Dental Restoration, Permanent↗
PubMed1990

[Resistance and retention as critical factors in silver amalgam restoration of endodontic posterior teeth. A clinical focus].

The root canal therapy does not make sense if it is not going to be restored properly. Even though we must keep in mind all the steps necessary to build up any vital tooth, we should emphasize the retention and resistency due to the fragility of endodontically treated teeth and to the destruction of these teeth. Even though the use o silver amalgam has been often questioned, we still consider amalgam as a proper material of a good half worm life to build up endodontically treated posterior teeth. Resistency and retention were considered as the essential factors to achieve the integrity of final restorations. We have analyzed the remaining tooth structure, periodontal support, biomechanics properties of the most used restorative materials and the variations of the forces. The different opinions on the concepts and technics have been reviewed and the final practical conclusions discussed.

Bicuspid↗
PubMedDate not supplied

[Analysis of the composition of endodontic cements].

The Authors analyse the composition of endodontic pastes and emphasize the inutility of many substances. Therefore it is necessary to study a technique for reducing the pastes in endodontic obturations and for increasing guttapercha.

Dental Cements↗
PubMedDate not supplied

[Temporary filling materials used in endodontics].

Temporary filling materials are used in endodontics to prevent contamination of the root canal system during intertreatment visits. The effectiveness of these materials in preventing the ingress and egress of fluids, salivary ions and bacteria is dependent upon a numerous physical and mechanical factors. This presentation was conducted to compare the sealing ability of several products that were recommended for the temporary restoration of teeth undergoing endodontic treatment.

Dental Leakage↗
PubMed1989

[Marginal leakage of glass ionomer as filling material for proximal decay in endodontic treatment].

The primary purpose of sealing proximal tooth defects during endodontic treatment is to prevent fluid, organic or bacterial contamination of the root canal system. At times, glass ionomers are used to restore proximal tooth defects between appointments, and after the root canal therapy. The purpose of this study was to evaluate the sealing ability of glass ionomers in teeth having proximal defects during root canal therapy. Sixty lower molars were extracted and prepared with standard endodontic access procedures. The mesial wall was then removed to mimic a proximal defect, and the tooth was filled with a glass ionomer in various thicknesses--0.8, 1.2 and 1.5 mm, respectively. After thermocycline treatment, all of the teeth were partially immersed in a 1% methylene blue dye for two weeks. During this period, the glass ionomer was directly observed to determine if any marginal leakage occurred. The glass ionomer was unacceptable if the dye penetrated to the interior wall of the pulp chamber. If not, it was classified as acceptable. The results indicated that dye penetration or leakage was least likely to occur in a 1.5 mm glass ionomer group.

Dental Leakage↗