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Biomedical subjects

P F Briggs

Publications and source records attributed to P F Briggs.

At least 19 recordsLinked to original sources
PubMed1997

Evidence-based dentistry: endodontic failure--how should it be managed?

OBJECTIVE: To review the evidence on the most appropriate management of failed endodontic treatment. DATA SOURCES: Appropriate articles were selected from the international literature. RESULTS: There was good evidence that conventional endodontic treatment is associated with a successful outcome in a significant proportion of cases. The results of surgical treatment are more difficult to interpret since account should be made of the status of the existing root filling. However, there is evidence of an increased success rate with a satisfactory orthograde root filling. CONCLUSIONS: It is difficult to make direct comparisons from cited studies to advance a clear argument in support of one treatment modality. However, it is judged that a conventional endodontic retreatment approach is the most appropriate in the first instance, providing access to the root canal is possible. This does not preclude a subsequent surgical approach. Teeth that are permanently restored soon after retreatment are more successful than those which are not. There are significant challenges in setting up prospective research studies to directly address the problem of the failed root filing.

Apicoectomy↗
PubMed1997

The clinical evolution of the 'Dahl Principle'.

The restorative management of patients with localised tooth wear is a major challenge to the dental profession. There is rarely adequate interocclusal space available to place restorations without the need for extensive tooth preparation or the involvement of many unaffected teeth. In 1975, a method was described which created interocclusal space by the use of a partial coverage appliance made of cobalt chromium alloy. The technique reduced the need for more invasive palatal reduction. This paper, with the aid of clinical case examples, highlights the development and evolution of the original removable appliance. However, there remains a need for further clinical studies to evaluate fully these techniques.

Adolescent↗
PubMed1996

The re-establishment of molar occlusion following orthognathic surgery.

The effect on distal molar occlusion following mandibular orthognathic surgery is highlighted. Two cases are presented in which at the completion of orthodontic/surgical treatment a stable molar occlusion was re-established by adjunctive restorative treatment. The clinical problem highlighted, illustrates the importance of restorative support for patients with residual post-orthodontic and post-surgical occlusal problems.

Crowns↗
PubMed1994

Modern restorative management of advanced tooth-surface loss.

This article describes the restorative management of a case of advanced, localised tooth-surface loss using modern materials and techniques. Particular emphasis is placed on the conservation of tooth structure while providing restorations with optimum physical and aesthetic characteristics.

Adult↗
PubMed1994

Tooth-surface loss related to pregnancy-induced vomiting.

We present a clinical case of tooth-surface loss affecting the palatal surfaces of the upper incisors, caused by prolonged pregnancy-induced vomiting. The patient was successfully treated, first orthodontically and then with indirect composite palatal veneers. As dental practitioners, we should be aware of this problem when screening pregnant patients, as early diagnosis and prevention are important.

Adult↗
PubMed1993

A comparison of the dentine-removing characteristics of two endosonic units.

The purpose of this study was to compare the dentine-removing characteristics of size 25 K-files activated by the Cavi-Endo and Piezon-Endo units. The influence of power-setting, direction of file oscillation, interfacial force and operator-assisted movement were studied. Filing was performed on flat surfaces of dentine and impressions of the instrumented surfaces revealed characteristic patterns of dentine removal corresponding to the area of contact with the file which was quantified using a Reflex microscope. Differences in dentine removal as affected by the power output of the two systems were only apparent when the maximum power-setting on the Cavi-Endo was compared with the maximum recommended for root canal preparation on the Piezon-Endo. The Cavi-Endo removed significantly more dentine than the Piezon-Endo. When operator-assisted movement of the file was superimposed, both systems removed significantly more dentine than without assisted filing, However, the Piezon-Endo now removed significantly more dentine than the Cavi-Endo. This difference was more apparent when the file oscillated perpendicular to the dentine surface, compared with oscillation parallel to the substrate. An increase in the interfacial force from 30 g to 60 g resulted in a greater reduction in dentine removal by the Cavi-Endo compared with the Piezon-Endo. Thus, at a 30 g interfacial force there were insignificant differences between the endosonic units but at 60 g, the Piezon-Endo removed significantly more dentine than the Cavi-Endo. The dentine-removing characteristics of the two endosonic units tested are very different under certain conditions. These findings may have important clinical implications.

Dental Cavity Preparation↗
PubMed1993

Crown lengthening: a clinical review.

The use of crown lengthening surgery as an adjunct to restorative therapy was first suggested by Rosen and Gitnick. This technique is designed to increase the clinical crown heights of teeth requiring restoration following extensive wear through attrition, abrasion and erosion. This loss of tooth tissue and resulting clinical crown height may be localized to a few teeth or affect the entire dentition. This clinical problem is reflected by the increasing number of reports of treatment of the worn dentition.

Crown Lengthening↗
PubMed1993

Management of a tooth affected by idiopathic coronal resorption.

This article reports on the restoration of a permanent mandibular canine affected by significant idiopathic coronal resorption. A particular restorative approach and the alternative treatment options are discussed. The need for careful examination of diagnostic radiographs is emphasized.

Adolescent↗
PubMed1992

Diagnostic dilemma: an unusual presentation of an infected nasopalatine duct cyst.

The pertinent literature on nasopalatine duct cysts is reviewed. A case is reported in which a nasopalatine duct cyst infected by Actinomyces presented clinically with unusual features. The clinical findings could have been confused with an early acute periapical abscess arising from an incisor tooth. The relevant aspects of diagnosis are discussed.

Actinomycosis↗
PubMed1992

Dentine-removing characteristics of K-files energized by the Piezon-Endo.

This in-vitro study evaluated the pattern of dentine removal when a size 25 K-file energized by the Piezon-Endo was applied to flat surfaces of dentine under standardized conditions. The effects of power setting, interfacial force between file and dentine, direction of file oscillation and operator-assisted movement were examined. Vinyl polysiloxane impressions of the instrumented surfaces revealed characteristic patterns consisting of a series of oblique crests, similar to those observed in a previous study using the Cavi-Endo. Each crest was parallel to the next and separated by a relatively constant distance. These crests were disposed along the line of contact with the file. The Reflex microscope was used to determine the height, width and separation of these crests. There were differences in the amount and pattern of dentine removal compared with the study on the Cavi-Endo. When the file was held against the dentine surface using the minimum power setting and an interfacial force of 30 g, the pattern of dentine removal was very similar to that produced by the Cavi-Endo. Increasing the power setting to the maximum recommended for endodontics produced a slight but statistically non-significant increase in dentine removal. Further increase of the power setting to the absolute maximum produced significantly deeper and wider areas of dentine removal by the apical part of the file.(ABSTRACT TRUNCATED AT 250 WORDS)

Dental Cavity Preparation↗
PubMed1991

Case report: the management of severe tooth wear with palatal resin bonded cast restorations combined with removable partial dentures.

The restoration of advanced tooth wear can present considerable problems. Conventional fixed prosthodontic treatment can be destructive to the already compromised dental tissues, time consuming and therefore costly. With recent advances in resin bonded technology, this may now be considered an option for definitive treatment in such cases. This case illustrates the use of palatal resin retained cast metal veneers. These veneers restored the worn palatal surfaces of the anterior maxillary teeth, protected them from further wear and controlled thermal sensitivity. They also provided support for a conventional maxillary partial denture.

Aged↗
PubMed1989

Dentine-removing characteristics of an ultrasonically energized K-file.

This in vitro study evaluated the pattern of dentine removal when an ultrasonically energized file (Cavi-Endo-size 25 file) was applied to flat surfaces of dentine under standardized conditions. The influences of power setting, interfacial force between file and dentine, direction of file oscillation and operator-assisted movement were examined. Impressions of the instrumented surfaces revealed characteristic patterns consisting of a series of oblique crests, each one parallel to the next and separated by a constant distance along the line of contact with the file. Determination of height, width and separation of these crests with a Reflex microscope aided objective assessment. The simplest pattern was formed when the energized file was held against the dentine (power setting = 1; interfacial force = 30 g). Increasing the power setting to 8 caused deeper troughs over the apical 5 mm. The width of the crests corresponded to the taper of the file except at the apical tip where the crests were relatively wider. However, increasing the interfacial force to 60 g reduced the efficiency of the apical part of the file. The superimposition of operator-induced movement greatly increased the extent of dentine removal, resulting in a tapering groove with a persistent crestal pattern. Oscillation of the file perpendicular to the dentine surface had a significantly greater influence on dentine removal, producing a deeper groove than was obtained with oscillation parallel to the surface. These findings may be of relevance in aiding controlled root canal preparation when using the Cavi-Endo instrument.

Dental Cavity Preparation↗