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At least 775 records · Page 43Linked to original sources
PubMed1998

Dens evaginatus: review of the literature and report of several clinical cases.

Dens evaginatus (DE) presents as an innocuous looking tubercle of enamel on the occlusal surface of a tooth, most commonly a bicuspid. Problems can arise when the tubercle is either worn, ground, or fractured off, resulting in pulpal exposure and possible loss of vitality of the tooth. Dentists who perform orthodontic treatment should be aware of this dental anomaly, which occurs in at least two per cent of the Asian and Native Indian populations. Bicuspid extraction cases should involve the extraction of the anomalous premolars rather than the normal ones. In addition, the dentist should be mindful of occlusal changes that may occur during treatment or occlusal equilibration, both of which can jeopardize the vitality of teeth with DE. Pulp capping or partial pulpotomy has been postulated to be one of the most reliable forms of vital tooth treatment when pulp exposure is encountered following the sterile removal of the tubercle. When pulp exposure is not encountered, preventive resin composite sealing of the dentin or class I amalgam cavity preparation seems to be the treatment of choice.

Adolescent↗
PubMed1995

Coronal microleakage in conservatively restored endodontic access preparations.

This study evaluated the coronal microleakage of endodontic access preparations restored with glass ionomer cement (GIC), composite resin (CR), or the "sandwich" (GIC/CR) techniques. The size of access preparation for 32 freshly extracted maxillary premolars was standardized by using a stainless steel template. The teeth were randomly divided into three experimental groups of 10 teeth and one group of two control teeth. Group One: light cured glass ionomer cement, Vitra Bond (3M Dental Products Division, St. Paul, MN). Group Two: composite resin, Silux Plus (3M Dental Products Division, St. Paul, MN). Group Three: "sandwich" technique, consisting of a 3 mm glass ionomer cement base and composite resin restoring the remaining access. The restorative materials were placed incrementally and cured from the facial, lingual and occlusal planes for 20-second intervals. The teeth were thermocycled for 24 hours, immersed in methylene blue dye for 48 hours, and then sectioned to measure dye penetration. This study differed substantially from similar leakage studies. The "sandwich" (GIC/CR) and the composite resin restorations allowed significantly less coronal leakage than the glass ionomer cement restorations. Although not statistically significant, less leakage was measured with the "sandwich" restoration than the composite resin restoration.

Bicuspid↗
PubMedDate not supplied

Preeruptive intracoronal radiolucencies: review and report of case.

Intracoronal radiolucencies in unerupted teeth are an uncommon radiographic finding; but their early detection and classification allow the most appropriate management protocol to be developed. Early separation of lesions into those that are developmental and remain static and those that are reactive and aggressive is necessary for a controlled outcome. The current paper reviews possible formative mechanisms and describes a case of severe intracoronal resorption resulting in loss of the tooth.

Child↗
PubMed1997

Use of videofluoroscopy in zoo dentistry: endodontic procedure in a tiger.

Videofluoroscopy was used as a radiographic technique to visualize a canine tooth during root canal therapy in a Siberian tiger. Videofluoroscopy was useful because the procedure was performed in a zoo setting with no access to an on-site darkroom. The fluoroscopic screen and videotape allowed for immediate viewing of the root canal system.

Animals↗
PubMed1997

An in vitro investigation of coronal leakage with three gutta-percha backfilling techniques.

The aim of this study was to compare the backfilling capabilities of System B, Obtura II and Alphaseal. Forty-six lower premolar teeth were prepared chemomechanically and allocated to four experimental and two control groups. Ten were obturated using lateral condensation as a standard and 30 were obturated in the apical third using the System B. The latter 30 teeth were then backfilled using one of three techniques, System B, Obtura II or Alphaseal (n = 10 in each group). The remaining six teeth served as controls. Roots were radiographed from the proximal in order to evaluate voids and then placed in India ink for 65 h prior to being demineralized and rendered transparent, coronal leakage was quantified by linear measurement of ink penetration. No significant difference was found between the four groups with respect to the presence of voids radiographically (P < 0.05). The difference in leakage between the System B and Obtura II groups was not significant (P > 0.05). Both System B and Obtura II leaked significantly less than Alphaseal and lateral condensation (P < 0.001).

Bicuspid↗
PubMed1997

Cuspal fracture resistance and microleakage of glass ionomer cements in primary molars.

The purpose of this study was to comparatively evaluate the fracture strength and microleakage among two new glass ionomer cements. One hundred and ten primary first and second molars were divided into two main groups, one group comprising of fifty teeth for microleakage evaluation and second group of sixty for fracture strength. Both the groups were subdivided equally into four based on the materials used, consisting of the same number of teeth respectively, in each. Two controls were used for cuspal fracture strength and an additional trial group was added for microleakage evaluation. Ideal, non retentive class II were prepared and restored with amalgam, Fuji IX, Fuji II LC and Vitremer. The statistical analysis revealed highly significant differences among all the subgroups except between subgroup 3 vs. 4 and 1 for cuspal fracture strength. Similarly microleakage values were significantly different statistically among sub groups 4 and 5 vs 1 and 2. The present study revealed that Fuji IX was the best in terms of cuspal fracture strength and Fuji IX with an additional application of light cure resin sealant gave the lowest degree of microleakage.

Analysis of Variance↗
PubMed1998

The use of an orthodontic thermoplastic retainer as a provisional anterior restoration: a case report.

Children who present with extensive fractures of anterior teeth pose a difficult clinical problem. Pulpal and periodontal injuries must be carefully assessed and managed. Rapid restoration of the form and contour of the extensively fractured tooth is advisable, not only to improve esthetics but also to prevent unwanted tipping or tilting of adjacent teeth and overeruption of opposing teeth. A modified Essix retainer, simply constructed in the laboratory, can be used to provisionally restore the extensively fractured anterior tooth.

Child↗
PubMed1998

Management of accidental and iatrogenic injuries to the dentition.

This article discusses the restoration of teeth with extensive fractures extending beyond the attachment of the periodontal ligament, as well as the treatment of iatrogenic perforations observed during post space preparation. Various treatment procedures and their limitations are described, based on the authors' many years of clinical experience.

Humans↗
PubMedDate not supplied

Pre-eruptive intracoronal lesion of a mandibular first molar.

A patient developed an acute apical abscess on a mandibular first molar with an intact occlusal sealant. Radiographs reveal no typical patterns of decay on occlusal or proximal surfaces. An unusual lesion within dentin and an apparent extension from it to the external tooth surface are visible on films at the time of onset of symptoms as well as prior to eruption. Possible explanations for the lesion and its progression are discussed.

Child↗