Abstract:
BACKGROUND:The aim of this study was to identify the nature and causes of deterioration and failure in dental handpiece ball bearings and thus provide guidance for clinical handling for service longevity. METHODS:The bearings of 36 turbine assemblies were dismantled for visual inspection, documented using a digital camera, and examined using scanning electron microscopy, as appropriate. RESULTS:For the metal parts of the ball bearing assembly, defects observed were mainly wear arising from the running load and corrosion. This was in the form of scratches and discoloured circumferential bands on the balls, and dull or worn surfaces extending around the circumference of the raceways. Cage damage including cracking, fracture, surface rubbing and distortion occurred, in varying degrees, in every failed turbine. CONCLUSIONS:Dental ball bearing failure modes have been identified. Cumulative effects of damage from corrosion and mechanical factors lead to handpiece deterioration. The cage was found to be very vulnerable to damage, and this may be the key limitation on bearing lifetime. Autoclaving may contribute to that, as it does to corrosion in the absence of adequate lubrication, but this seems to be minor in comparison to the effects of abuse. There is no justification for failing to observe usage and sterilization instructions.
journal_name
Aust Dent Jjournal_title
Australian dental journalauthors
Wei M,Dyson JE,Darvell BWdoi
10.1111/adj.12112subject
Has Abstractpub_date
2013-12-01 00:00:00pages
514-21issue
4eissn
0045-0421issn
1834-7819journal_volume
58pub_type
杂志文章abstract::The original design of a semi-precision extra-coronal attachment for partial dentures is illustrated, and its fabrication in a cast non-precious bondable alloy is described. A step-by-step method is also described of bonding multiple attachments in parallel for the retention and support of removable partial dentures. ...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1992.tb05895.x
更新日期:1992-12-01 00:00:00
abstract::The effects of orthodontic tooth movement on pulpal responses are of interest to the clinician. Alterations to pulpal physiology may result in altered responses to external stimuli. This pilot project tested a small group of orthodontic patients during the early stages of treatment. Heat, cold and electrical stimuli w...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1998.tb00189.x
更新日期:1998-10-01 00:00:00
abstract::Periostitis ossificans is a rare condition which has not been previously reported arising from an infected dentigerous cyst. This paper reports such a case in a twelve-year-old boy, and reviews the literature concerning periostitis ossificans. ...
journal_title:Australian dental journal
pub_type: 杂志文章,评审
doi:10.1111/j.1834-7819.1991.tb00722.x
更新日期:1991-08-01 00:00:00
abstract::This article is a review of the recent literature pertaining to the oral sequelae of eating disorders (EDs). Dentists are recognized as being some of the first health care professionals to whom a previously undiagnosed eating disorder patient (EDP) may present. However, despite the prevalence (up to 4 per cent) of suc...
journal_title:Australian dental journal
pub_type: 杂志文章,评审
doi:10.1111/j.1834-7819.2005.tb00079.x
更新日期:2005-03-01 00:00:00
abstract:BACKGROUND:This study aimed to investigate the effect of silver and fluoride ions on demineralization of enamel. METHODS:The coronal parts of 40 extracted sound premolars were prepared into tooth blocks. An unvarnished occlusal surface window (OW) and a flat buccal/lingual surface window (FW) were created for each too...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.2011.01641.x
更新日期:2012-03-01 00:00:00
abstract::A multidisciplinary pain centre study of 120 consecutive chronic orofacial pain patients assessed pain description and intensity ratings, gender differences, prevalence of concurrent conditions, and interinstrument relationships of the McGill Pain Questionnaire and visual analogue scale. Pain words chosen by patients ...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1998.tb00200.x
更新日期:1998-12-01 00:00:00
abstract:BACKGROUND:The aim of this study was to compare the accuracy of shade selection using a spectrophotometer with a conventional method using a shade guide for 'trained' and 'untrained' students. METHODS:The 'trained' group were given a presentation and training exercise on colour science and shade selection and the 'unt...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/adj.12311
更新日期:2015-06-01 00:00:00
abstract:BACKGROUND:Localized aggressive periodontitis (LAgP) is an infectious periodontal disease which generally affects young people. Recent data suggest the involvement of different bacterial species in different populations. The causative bacterial species in Israel has never been identified despite a high prevalence of LA...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/adj.12165
更新日期:2014-06-01 00:00:00
abstract::The first year of a new Bachelor of Dental Surgery curriculum was introduced at the University of Adelaide in 1993. Four integrated streams replaced the previous large number of separate subjects, with an overall reduction in formal contact hours, more exposure to clinical practise, and an emphasis on problem-based le...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1996.tb03145.x
更新日期:1996-10-01 00:00:00
abstract::The young dental graduate expects to deliver a certain standard of health care to the community. It is likely that both the standard of care required by the Australian people and the proportion of the population seeking treatment will increase in the coming decades. The dental profession has a responsibility to meet t...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1978.tb03537.x
更新日期:1978-08-01 00:00:00
abstract::The problems associated with positioning anterior health teeth in prosthetic treatment procedures are discussed and some recent work reviewed. Useful guides for establishing the artificial anterior dental relationship have been described and an application of these guides has been illustrated. ...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1977.tb04462.x
更新日期:1977-04-01 00:00:00
abstract::There was a 70 per cent response to a mail questionnaire to a 1:3 sample of Australian Dental Association members in private practices (n = 1931). Computers were used by 37 per cent of practices. Main computer applications used were for: accounting (84%); patient billing (80%); word processing (79%); and patient recal...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1993.tb03062.x
更新日期:1993-06-01 00:00:00
abstract:BACKGROUND:The current retrospective cross-sectional study investigated 5-18-year treatment outcomes in subjects who did not complete a recommended course of periodontal therapy. METHODS:Sixty-five subjects who voluntarily discontinued therapy were recalled. The subjects' demographic data and dental history since disc...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/adj.12440
更新日期:2017-06-01 00:00:00
abstract::A sample of 422 students at the Australian National University was examined in 1972. Results for the 302 full-time student sample were considered significant and are presented in this report. The students were found to have a relatively low (for Australia) DMFT of 13.8, Oral Hygiene Index of 0.9 and Periodontal Index ...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1976.tb01047.x
更新日期:1976-08-01 00:00:00
abstract:BACKGROUND:Dental problems presenting to general hospital emergency departments (GHEDs) may create difficulties as there may not be appropriate facilities or personnel to manage them. The incidence and demographics of dental presentations to GHEDs in Tasmania are currently unexamined. This knowledge may be relevant in ...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/adj.12202
更新日期:2014-09-01 00:00:00
abstract::Previous studies have shown the ability for bone to grow under occlusive membranes. This study was undertaken to determine the time required for bone to form in the space created under the membrane and to determine the amount of bone that may be grown under the membrane. Thirty-two New Zealand white rabbits were divid...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1998.tb06094.x
更新日期:1998-04-01 00:00:00
abstract::Glass ionomer (polyalkenoate) cements have proved to be superior to zinc phosphate cements as orthodontic luting agents. Setting behaviours at different temperatures were recorded by an oscillating rheometer under controlled conditions. The working time of these cements can be increased by mixing on a chilled glass sl...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1991.tb04711.x
更新日期:1991-06-01 00:00:00
abstract::Dental patients are often aware that radiation has the potential to harm them but they do not usually understand how or why and what potential harmful effects may arise from dental radiographs. The potential for undesirable effects must be balanced against the benefits obtained from radiographs. Dentists should addres...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.2000.tb00559.x
更新日期:2000-09-01 00:00:00
abstract::Oral mucosal lichen planus (OMLP) is a well recognized mucosal disease with unknown aetiology. Considerable controversy exists as to whether OMLP is intrinsically premalignant, or if the disorder facilitates the development of oral mucosal squamous cell carcinoma (OMSCC) by external factors. The aim of the present stu...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1996.tb05919.x
更新日期:1996-04-01 00:00:00
abstract::Various methods, with a variety of materials, exist for restoring carious primary teeth. Successful restoration of primary teeth is dependent on accurate diagnosis, knowledge of the caries process, knowledge of dental materials, and treatment choice. The purpose of this evidence-based review is to present evidence tha...
journal_title:Australian dental journal
pub_type: 杂志文章,评审
doi:10.1111/adj.12682
更新日期:2019-06-01 00:00:00
abstract:BACKGROUND:Dentine hypersensitivity (DH) occurs on exposed dentine and is dependent on the patency of dentinal tubules. This study compared the effectiveness of red propolis extract (RPE), calcium sodium phosphosilicate (Novamin) and arginine-calcium carbonate (ACC) in occluding dentine tubules. METHODS:Eighty dentine...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/adj.12275
更新日期:2015-03-01 00:00:00
abstract::The availability of improved ceramic materials, bonding techniques, new technology and issues of amalgam safety have led to a revival of interest in ceramic inlays in dentistry over the past ten years. Clinical studies have been carried out during this time using various evaluation techniques to assess the clinical pe...
journal_title:Australian dental journal
pub_type: 杂志文章,评审
doi:10.1111/j.1834-7819.1999.tb00217.x
更新日期:1999-09-01 00:00:00
abstract::In Australia there is a tradition of early involvement of children in contact sports. Mouthguards are known to reduce the risk of dental and associated injuries--however, Australian studies of the use of mouthguards in contact sports and the prevalence of dental and associated injuries have only focused on adult parti...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1996.tb04869.x
更新日期:1996-08-01 00:00:00
abstract::A 27-year-old male suffered a fractured mandible following extraction of a tooth. It was subsequently found that the fracture occurred in an area pathologically weakened by a localized lesion of Langerhans cell disease. Since lesions of the jaws may be seen either as the first manifestation or as a complication of wid...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1991.tb04725.x
更新日期:1991-12-01 00:00:00
abstract::The supplementation of a low phosphate diet with vitamin D has been shown to result in an increase in bone resorption in the hypophosphataemic rat. The aim of the present study was to determine if administration of vitamin D to rats fed a vitamin D- and phosphate-depleted diet would result in an increase in the circul...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1997.tb00107.x
更新日期:1997-04-01 00:00:00
abstract::The objectives of this Malaysian study were to investigate the relationship between severity of trauma and interval before treatment, and the effect of delayed treatment on prognosis. A total of 123 traumatized permanent incisors were observed over a 24-month period. Results of this study suggest that the interval bet...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1990.tb05425.x
更新日期:1990-10-01 00:00:00
abstract::Oral squamous cell carcinoma (OSCC) is one of the most common solid tumours occurring after haematopoietic stem cell transplantation (HSCT), especially in patients with chronic graft-versus-host-disease (cGVHD). We describe a case of OSCC that developed in a 51-year-old male 22 years after he had received allogeneic H...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/adj.12343
更新日期:2015-09-01 00:00:00
abstract::The radiopacity of 33 commercially available composite materials was measured in terms of their equivalent thickness of an aluminum alloy per unit thickness of material. The theoretical significance of this definition was discussed. The radiopacities were found to vary by more than an order of magnitude. Although near...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1981.tb02443.x
更新日期:1981-04-01 00:00:00
abstract:BACKGROUND:This in vitro study analysed the effect of different fluoride concentrations in acidic or neutral liquid dentifrices in protecting enamel and dentine from erosive and abrasive wear. METHODS:Bovine enamel and dentine specimens (n = 132) were randomly allocated to 11 groups (each n = 12): experimental liquid ...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/adj.12016
更新日期:2013-03-01 00:00:00
abstract::The delivery of effective information flow through self learning, critical thinking and problem solving is one of the objectives of current curriculum development within the Dental Faculty of the University of Hong Kong. These objectives reflect a desire to encourage skills related to 'comprehension learning' and 'mea...
journal_title:Australian dental journal
pub_type: 杂志文章
doi:10.1111/j.1834-7819.1992.tb00828.x
更新日期:1992-02-01 00:00:00