The presence and identification of organisms transmitted to dental laboratories

Powell, Glen; Runnells, R.; Saxon, B A; Whisenant, Brian

doi:10.1016/0022-3913(90)90185-f

Cited by 138 publications

(130 citation statements)

References 3 publications

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“…25,40 The potential for transmission of infective agents from the dental surgery to the dental laboratory via inadequately disinfected impressions has previously been demonstrated. 41 This is a sobering thought in contemporary dental practice where infection with diseases such as HIV, Hepatitis B, and Hepatitis C, present real threats to all members of the oral healthcare team.…”

Section: Discussionmentioning

confidence: 99%

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%

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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“…Microorganisms from the oral cavity, in fact, can survive on the impression surface and can be transferred to the stone casts (1)(2)(3)(4)(5). Moreover, simply washing with water or rinsing in running water does not completely remove contaminating organisms from the impression (3,6,7).…”

Section: Introductionmentioning

confidence: 99%

The effect of immersion disinfection procedures on dimensional stability of two elastomeric impression materials

et al. 2008

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The aim of this study was to determine the effect of immersion disinfection procedures on the dimensional stability of two elastomeric impression materials. Impressions of a stainless steel die were made with polyether (PE) and with additionpolymerized silicone rubber (PVS). The test specimens underwent disinfection treatment by immersion in two commercially available solutions containing quaternary ammonium compounds (Sterigum Powder, SP) and glutaraldehyde plus an amino derivative (MD520, MD), respectively. The impressions were measured at 4 different time points: before any disinfection treatment (T0); after the first disinfection (T1); 6 hours after the first disinfection (T2); after the second disinfection, carried out 6 hours after the first one (T3). Impressions which were not disinfected served as controls. When both impression materials were disinfected with SP, significant differences were detected among all measurements (P < 0.0001), with the exception of T2 vs T3 (P > 0.05). On the other hand, when MD was used, significant differences were found when T0 measurement was compared to T1, T2 and T3 measurements (P = 0.0043 for PE, and P = 0.0014 for P V S ) . T h e d i m e n s i o n a l c h a n g e o f a l l material/disinfectant combinations was always ≤0.5%. Therefore, the effects of immersion disinfection on the dimension of elastomers in SP or MD are not clinically relevant. (J. Oral Sci. 50, [441][442][443][444][445][446] 2008)

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“…In order to eliminate or reduce the crosscontamination, the prostheses should be disinfected with chemical solutions. Prosthetic materials sent from the dental clinics to the dental laboratories are contaminated by pathogenic bacteria, which could be transferred to the technicians by means of direct contact or during the finishing and polishing procedures (1).…”

Section: Introductionmentioning

confidence: 99%

Effect of microwave disinfection on physical and mechanical properties of acrylic resins

et al. 2008

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This study evaluated the effect of microwave energy on the hardness, impact strength and flexural strength of the Clássico, Onda-Cryl and QC-20 acrylic resins. Aluminum die were embedded in metallic or plastic flasks with type III dental stone, in accordance with the traditional packing technique. A mixing powder/liquid ratio was used according to the manufacturer's instructions. After polymerization in water batch at 74ºC for 9 h, boiling water for 20 min or microwave energy at 900 W for 10 min, the specimens were deflasked after flask cooling at room temperature, and submitted to finishing. Specimens non-disinfected and disinfected by microwave irradiation were submitted to hardness, impact and flexural strength tests. Each specimen was immersed in distilled water and disinfected in a microwave oven calibrated to 650 W for 3 min. Knoop hardness test was performed with 25 g load for 10 s, impact test was carried out using the Charpy system with 40 kpcm, and 3-point bending test with a crosshead speed of 0.5 mm/min until fracture. Data were submitted to statistical analysis by ANOVA and Tukey's test =0.05). Disinfection by microwave energy decreased the hardness of Clássico and Onda-Cryl acrylic resins, but no effect was observed on the impact and flexural strength of all tested resins.

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The presence and identification of organisms transmitted to dental laboratories

Cited by 138 publications

References 3 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

The effect of immersion disinfection procedures on dimensional stability of two elastomeric impression materials

Effect of microwave disinfection on physical and mechanical properties of acrylic resins

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