The quality of impressions for crowns and bridges received at commercial dental laboratories

Winstanley, R B; Carrotte, P; Johnson, A.

doi:10.1038/sj.bdj.4809468

Cited by 55 publications

(51 citation statements)

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“…18,21,22 The benefits of postgraduate and continuing educational courses in removable partial denture design in overcoming this difficulty have been highlighted. 22,23,26 It is clearly evident that despite the development of national guidelines on dental undergraduate training, the introduction of vocational training over ten years ago, the recent introduction of con- continuing professional development, and the consistent documentation of poor quality prescription of fixed and removable prostheses over the last 30 years, there are still significant problems of poor quality prescriptions and use of inappropriate impression trays and materials. Some authors have claimed that the lack of proper prescription and use of inappropriate materials relates to inadequate funding of the provision of prostheses.…”

Section: Discussionmentioning

confidence: 99%

“…Some authors have claimed that the lack of proper prescription and use of inappropriate materials relates to inadequate funding of the provision of prostheses. 6,26,38 This criticism is usually directed at services provided on the National Health Service, inferring that if the fee were increased then the quality of the service provided would also increase. The authors feel that this argument may not be entirely valid.…”

Section: Discussionmentioning

confidence: 99%

“…Various reasons have been advanced for this over the years, and relate mainly to educational 6,10,[18][19][20][21][22][23]37 and financial 6,26,38 issues. Historically, in the field of removable partial prosthodontics, investigators have highlighted a lack of adequate educational exposure at dental undergraduate level; 6,19,20 a lack of confidence in designing dentures related to a lack of clinical exposure; 6,37 and a discrepancy between the principles of removable partial denture design taught in dental schools and those subsequently employed in clinical practice.…”

Section: Discussionmentioning

confidence: 99%

“…[25][26][27] These studies were performed prior to the introduction of professional guidelines in this area.…”

Section: Introductionmentioning

confidence: 99%

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Quality of written prescriptions and master impressions for fixed and removable prosthodontics: a comparative study

Lynch

Allen

2005

Br Dent J

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A Ai im m: Various ethical and legal guidelines require dental practitioners to adequately design, prescribe and fabricate good quality prostheses. The purpose of this investigation was to examine the quality of written instructions and choice of impression trays and materials for both fixed and removable prosthodontics in Ireland and the United Kingdom. M Ma at te er ri ia al ls s a an nd d m me et th ho od ds s: A pre-piloted questionnaire was distributed to a number of large commercial laboratories geographically distributed throughout the United Kingdom and Ireland. Information was sought relating to the quality of written instructions and use of impression trays and materials for three forms of 'dental precision casting' -cobalt-chromium based removable partial dentures, full veneer porcelain-fused-to-metal crowns, and conventional fixed bridges. R Re es su ul lt ts s: Six hundred questionnaires were distributed, and information was received relating to 447 items of prosthodontic treatment (response rate= 75%). Ninety-five per cent of cases were privately funded. Using pre-determined grading criteria, poor or no written instructions were provided in one-half of cases examined. One-half of master impressions were made using a plastic stock tray. The technician felt that material had been appropriately disinfected prior to being sent to the laboratory in only 57% of cases. C Co on nc cl lu us si io on n: : The written instructions and master impressions examined in this study failed to meet the relevant ethical and legal guidelines in approximately 50% of cases.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…[25][26][27] These studies were performed prior to the introduction of professional guidelines in this area.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Quality of written prescriptions and master impressions for fixed and removable prosthodontics: a comparative study

Lynch

Allen

2005

Br Dent J

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“…It is therefore of some concern that recent studies report impression defects at the finish line in over a third of cases. 23,24 These defects are usually the result of inadequate gingival management in the following circumstances:…”

Section: Visible Flaws Finish Line Not Visiblementioning

confidence: 99%

Crowns and other extra-coronal restorations: Impression materials and technique

2002

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Well-fitting indirect restorations can only be made if there are accurate models of the oral tissues available, made from high quality impressions. Waiting for an impression to set may be more stressful for the dentist than the patient. Should the impression need to be repeated there is the embarrassment of having to explain this to the patient, the cost implications of material and time wasted and the aggravation of running late for the next appointment. Yet, if a 'Nelsonian' eye is turned to a defective impression we can only expect a substandard restoration in return.

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Quality of Impressions and Work Authorizations Submitted by Dental Students Supervised by Prosthodontists and General Dentists

Imbery

Diaz

Greenfield

et al. 2016

Journal of Dental Education

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Preclinical fixed prosthodontics is taught by Department of Prosthodontics faculty members at Virginia Commonwealth University School of Dentistry; however, 86% of all clinical cases in academic year 2012 were staffed by faculty members from the Department of General Practice. The aims of this retrospective study were to quantify the quality of impressions, accuracy of laboratory work authorizations, and most common errors and to determine if there were differences between the rate of errors in cases supervised by the prosthodontists and the general dentists. A total of 346 Fixed Prosthodontic Laboratory Tracking Sheets for the 2012 academic year were reviewed. The results showed that, overall, 73% of submitted impressions were acceptable at initial evaluation, 16% had to be poured first and re-evaluated for quality prior to pindexing, 7% had multiple impressions submitted for transfer dies, and 4% were rejected for poor quality. There were higher acceptance rates for impressions and work authorizations for cases staffed by prosthodontists than by general dentists, but the differences were not statistically significant (p=0.0584 and p=0.0666, respectively). Regarding the work authorizations, 43% overall did not provide sufficient information or had technical errors that delayed prosthesis fabrication. The most common errors were incorrect mountings, absence of solid casts, inadequate description of margins for porcelain fused to metal crowns, inaccurate die trimming, and margin marking. The percentages of errors in cases supervised by general dentists and prosthodontists were similar for 17 of the 18 types of errors identified; only for margin description was the percentage of errors statistically significantly higher for general dentist-supervised than prosthodontist-supervised cases. These results highlighted the ongoing need for faculty development and calibration to ensure students receive the highest quality education from all faculty members teaching fixed prosthodontics.Dr. Imbery is Associate Professor,

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The quality of impressions for crowns and bridges received at commercial dental laboratories

Abstract: Quality standards for impressions for crown and bridge work in general dental practice in the UK are a cause for concern if the sample of cases seen in this study is typical.

Cited by 55 publications

References 0 publications

Quality of written prescriptions and master impressions for fixed and removable prosthodontics: a comparative study

Quality of written prescriptions and master impressions for fixed and removable prosthodontics: a comparative study

Crowns and other extra-coronal restorations: Impression materials and technique

Quality of Impressions and Work Authorizations Submitted by Dental Students Supervised by Prosthodontists and General Dentists

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