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Laboratory Technicians (laboratory + technician)
Kinds of Laboratory Technicians Selected AbstractsCommunication Between the Dental Laboratory Technician and Dentist: Work Authorization for Fixed Partial DenturesJOURNAL OF PROSTHODONTICS, Issue 2 2006Zahra Afsharzand DMD Purpose: A questionnaire was sent to laboratory technicians to determine the level of communication between dentists and dental laboratories in specific areas of the work authorization forms for the fabrication of fixed partial dentures. Materials and Methods: A select number of dental laboratories were randomly chosen from the National Association of Dental Laboratories (NADL) for each of the 50 states. The questionnaire was mailed to the laboratory directors for a total of 199 dental laboratories. The survey asked questions pertaining to the following areas of work authorization: legibility and thoroughness of prescriptions, patient information, choice of materials for the prosthesis, design of the prosthesis, and shade description. For each question, the number of responses received was tabulated and converted to a percentage. Results: Of the 199 laboratories surveyed, 114 (57%) responded to the questionnaire. Results from this survey suggest that there is lack of communication between dentists and dental laboratories through work authorization forms regarding choice of metal alloy, type of porcelain to be used, and choice of margin and pontic design for the prosthesis. Conclusions: Information obtained from the responding laboratories included effectiveness of work authorization forms. There were some similar trends indicated by the large percentage of dental laboratories agreeing on lack of communication by the dentists as reflected by the work authorization forms. [source] Spectrophotometric Analysis of Tooth Color Reproduction on Anterior All-Ceramic Crowns: Part 2: Color Reproduction and Its Transfer from In Vitro to In VivoJOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 1 2010AKI YOSHIDA RDT ABSTRACT Color reproduction of an anterior tooth requires advanced laboratory techniques, talent, and artistic skills. Color matching in a laboratory requires the successful transfer from in vivo with careful considerations. The purpose of this study was to monitor and verify the color reproduction process for an anterior all-ceramic crown in a laboratory through spectrophotometric measurements. Furthermore, a crown insertion process using composite luting cements was assessed, and the final color match was measured and confirmed. An all-ceramic crown with a zirconia ceramic coping for the maxillary right central incisor was fabricated. There was a significant color difference between the prepared tooth and the die material. The die material selected was the closest match available. The ceramic coping filled with die material indicated a large color difference from the target tooth in both lightness and chromaticity. During the first bake, three different approaches were intentionally used corresponding with three different tooth regions (cervical, body, and incisal). The first bake created the fundamental color of the crown that allowed some color shifts in the enamel layer, which was added later. The color of the completed crown demonstrated an excellent color match, with ,E 1.27 in the incisal and 1.71 in the body. In the cervical area, color match with ,E 2.37 was fabricated with the expectation of a color effect from the underlying prepared tooth. The optimal use of composite luting cement adjusted the effect from the underlying prepared tooth color, and the color match fabricated at a laboratory was successfully transferred to the clinical setting. The precise color measurement system leads to an accurate verification of color reproduction and its transfer. CLINICAL SIGNIFICANCE The use of a dedicated dental spectrophotometer during the fabrication of an all-ceramic crown allows the dentist and the laboratory technician to accurately communicate important information to one another about the shade of the tooth preparation, the shade of the contralateral target tooth, and the influence of luting cement on the final restoration, thereby allowing the technician better control over the outcome of their tooth color matching efforts and the final color match of an all-ceramic restoration. (J Esthet Restor Dent 22:53,65, 2010) [source] A Prospective Ten-Year Clinical Trial of Porcelain VeneersJOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 2 2006Article first published online: 25 APR 200 abstract Objective:, The purpose of this prospective clinical study was to evaluate the performance of porcelain veneers after 5 and 10 years of clinical service. Materials and Methods:, A single experienced clinician placed 87 porcelain veneers in 25 patients in 1990 and 1991. The teeth included maxillary central incisors to first premolars. As described in the 5-year report of this study, preparations included a chamfer margin, 0.3 to 0.7 mm labial enamel reduction, and incisal edge coverage. A single laboratory technician fabricated the veneers using feldspathic porcelain on refractory dies. Internal surfaces were etched with 5% hydrofluoric acid and silanated. Teeth were isolated with a rubber dam prior to veneer placement. All veneers were bonded with a light-activated resin cement. Patients were recalled at 5 to 6 years and at 10 years after initial veneer placement. Two evaluators examined each veneer for retention, fractures, color match, surface roughness, marginal adaptation, leakage, recurrent caries, pulp vitality, and patient satisfaction. Marginal adaptation was assessed further using scanning electron microscopy to examine epoxy replicas. Results:, Five years after placement, all 87 veneers remained in place and had "perfect" color match and surface smoothness. Four veneers had fractures, but only one of those required repair. Ninety-nine percent of the veneers had clinically acceptable marginal adaptation, although just 14% of the veneers had "perfect" marginal adaptation at all margins. One had clinically unacceptable staining from leakage. Recurrent caries was present at the proximal margin of two veneers. At the 10-year evaluation, which had a 93% recall rate, color match and surface roughness remained optimal. Thirteen of 22 patients were very satisfied with the esthetic result, whereas 7 complained of minor esthetic problems. The fracture rate increased substantially, to 34% at the 10-year recall. However, only 11% of the fractures were clinically unacceptable. None of the veneers had debonded, but the percentage of veneers with "perfect" marginal adaptation had declined to only 4%. Leakage was now evident around two-thirds of the veneers, and eight restorations had recurrent caries. Conclusion:, Porcelain veneers are a reliable and effective means for conservative esthetic treatment of anterior teeth in the long term. After 10 years of clinical service, esthetic results remained good, patient satisfaction was high, and the retention rate was excellent. The number of irreparable fractures was low. Appropriate preparation design, occlusion, and use of adhesive materials contribute to the ultimate outcome. [source] Esthetic Restoration of the Traumatized and Surgically Reconstructed Anterior MaxillaJOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 5 2002DGDP(UK), PAUL A. TIPTON BDS ABSTRACT: A car accident victim can lose not only anterior teeth but also the soft- and hard-tissue support for these teeth. This article describes a step-by-step approach to the treatment protocol for an accident victim in whom anterior teeth and the supporting tissues have been lost. The protocol is systematic and can be used for most accident cases, where the functional and esthetic demands are very high. CLINICAL SIGNIFICANCE: This article demonstrates how excellent teamwork among the dentist, implant surgeon, and laboratory technician can result in a well-conceived and successful restoration following traumatic injury of the dentition. [source] The Science of Communicating the Art of Esthetic Dentistry.JOURNAL OF ESTHETIC AND RESTORATIVE DENTISTRY, Issue 3 2001Part III: Precise Shade Communication ABSTRACT Shade matching is inherently complex and involves understanding the science of color, determining the shade and surface characteristics of teeth, and communicating this information to the laboratory technician. The laboratory technician then has the difficult task of mimicking the selected shade and ultimately reproducing it in the final restoration. CLINICAL SIGNIFICANCE This article describes several methods of communicating and several tools that are available to the restorative dentist to achieve the esthetic results desired. By using these simple techniques, the dentist and laboratory technician are better able to communicate the shade and surface characteristics of teeth. [source] A Quick Esthetic Remount Cast for All-Ceramic RestorationsJOURNAL OF PROSTHODONTICS, Issue 6 2010Paul A. Hansen DDS Abstract A technique is presented for the expedited fabrication of a remount cast for the alteration of all-ceramic crowns and fixed partial dentures. The remount cast allows the laboratory technician to know the precise location of the gingival tissues and allows modification of all-ceramic restorations. [source] Oral health in relation to wearing removable dentures provided by dentists, denturists and laboratory techniciansJOURNAL OF ORAL REHABILITATION, Issue 7 2003R. TuominenArticle first published online: 5 JUN 200 summary, The aim of this study was to evaluate the oral health of elderly Finnish men wearing removable dentures supplied either by dentists, denturists or laboratory technicians. From a sample of 550 men, 362 subjects were both interviewed and clinically examined. The subjects were asked a range of questions related to their oral health and dentures. Clinical examinations were carried out by one dentist using well-defined criteria and without knowing the information the respective subjects had given in the interview. The 242 denture wearers had a higher frequency (P < 0·001) of mucous membrane lesions (78·7%) than the 120 non-wearers (27·5%). Differences between the denture providers were small, although subjects with dentures provided by dentists had less often most of the recorded mucous membrane lesions than other denture wearers. Coating of tongue and cheilitis angularis were the most commonly encountered lesions. High levels of yeast growth were observed more frequently (P < 0·02) among subjects who had obtained their dentures from dentists (41·3%) than from either denturists (17·1%) or laboratory technicians (18·2%). Among dentate subjects, the average number of remaining teeth was higher (P < 0·05) among those who had obtained their dentures from dentists (8·7) than among subjects wearing dentures from denturists (5·9) or laboratory technicians (6·2). Subjects wearing dentures supplied by dentists had slightly better oral health than other denture wearers. The observed differences can be at least partly explained by dentists' patients having higher number of remaining teeth and also more frequent check-up visits. [source] Clinical quality of removable dentures provided by dentists, denturists and laboratory techniciansJOURNAL OF ORAL REHABILITATION, Issue 4 2003R. Tuominen summary, The aim of this study was to evaluate the clinical quality of removable dentures of elderly Finnish men, which had been prepared either by dentists, denturists or dental laboratory technicians. The participants comprised 242 denture-wearing subjects, with 231 maxillary and 177 mandibular removable dentures which had been prepared either by dentists, denturists or dental laboratory technicians. Clinical examinations were carried out without the examining dentist knowing who had provided the dentures. Complete dentures which had been illegally provided by laboratory technicians had significantly poorer retention and fitted less well in tuber and alveolar areas than those provided by either dentists or denturists. Complete maxillary dentures which had been provided illegally by laboratory technicians had significantly (P < 0·01) higher occurrence (90%) of some unacceptable characteristics than those (43%) provided by dentists or denturists. The difference between complete mandibular dentures was also obvious, 86% versus 59%, although statistically non-significant. Of those partial maxillary dentures provided by dentists 53% had some unacceptable characteristics, compared with 80% of those illegally provided by denturists or laboratory technicians (NS). In the case of partial mandibular dentures, 36% of those provided by dentists and 32% of those by denturists or laboratory technicians had some unacceptable characteristic (NS). Illegal provision of removable dentures seemed to be related to decreased clinical quality. [source] Dentist Communication with the Dental Laboratory for Prosthodontic Treatment Using ImplantsJOURNAL OF PROSTHODONTICS, Issue 3 2006Zahra Afsharzand DMD Purpose: A questionnaire was sent to U.S. dental laboratories to evaluate the level of communication between dentists and laboratory technicians and to determine trends in procedures and materials used in fixed and removable implant restorations. Methods and Materials: Dental laboratories were randomly chosen from the National Association of Dental Laboratories for each of the 50 states. The questionnaire was mailed to the laboratory directors for 199 dental laboratories. One hundred fourteen dental laboratories returned the survey, yielding a response rate of 57%. Of those laboratories, 37 indicated that they did not participate in the fabrication of fixed implant restorations, yielding a response rate of 39%. Forty-two dental laboratories indicated that they did not participate in the fabrication of implant-retained overdenture prostheses, yielding a response rate of 36%. Results: Results from this survey show inadequate communication by dentists in completing work authorization forms. Custom trays are used more frequently for implant-retained overdenture impressions and stock trays for impressions of fixed implant prostheses. Poly(vinyl siloxane) is the material most commonly used for both fixed and removable implant-supported prostheses. Two implants with stud attachments are used more widely than those with bar attachments for implant-retained overdentures. Conclusions: Most laboratories working on implant prosthodontic cases report inadequate communication between the laboratory and dentists related to materials and techniques used in fabrication of implant restorations. [source] Communication Between the Dental Laboratory Technician and Dentist: Work Authorization for Fixed Partial DenturesJOURNAL OF PROSTHODONTICS, Issue 2 2006Zahra Afsharzand DMD Purpose: A questionnaire was sent to laboratory technicians to determine the level of communication between dentists and dental laboratories in specific areas of the work authorization forms for the fabrication of fixed partial dentures. Materials and Methods: A select number of dental laboratories were randomly chosen from the National Association of Dental Laboratories (NADL) for each of the 50 states. The questionnaire was mailed to the laboratory directors for a total of 199 dental laboratories. The survey asked questions pertaining to the following areas of work authorization: legibility and thoroughness of prescriptions, patient information, choice of materials for the prosthesis, design of the prosthesis, and shade description. For each question, the number of responses received was tabulated and converted to a percentage. Results: Of the 199 laboratories surveyed, 114 (57%) responded to the questionnaire. Results from this survey suggest that there is lack of communication between dentists and dental laboratories through work authorization forms regarding choice of metal alloy, type of porcelain to be used, and choice of margin and pontic design for the prosthesis. Conclusions: Information obtained from the responding laboratories included effectiveness of work authorization forms. There were some similar trends indicated by the large percentage of dental laboratories agreeing on lack of communication by the dentists as reflected by the work authorization forms. [source] Workplace air quality and lung function among dental laboratory technicians,AMERICAN JOURNAL OF INDUSTRIAL MEDICINE, Issue 2 2006Suh-Woan Hu DDS Abstract Background Dental laboratory technicians are exposed to dust and/or methyl methacrylate (MMA) in the workplace. Potential effects of the exposures on lung function merit further clarification. Methods This study measured lung function of 45 dental technicians, before and after shifts, on 3 workdays and monitored workplace concentrations of particulate matter with aerodynamic diameter less than 2.5 mm (PM2.5) and MMA in five dental laboratories in Taiwan. Base metals in particles were analyzed by X-ray fluorescence. Repeated measurement analysis was applied to estimate potential effects of PM2.5 on pulmonary function. Results PM2.5 ranged from 26 µg/m3 to 664 µg/m3 and levels of MMA were low in these laboratories. Nickel, cobalt, and chromium were detected in the particles. After controlling for important factors, PM2.5 was associated with a small decrease in forced vital capacity and forced expiratory flow in one second. Conclusion Workplace PM2.5 was associated with a non-significant decrease in lung function of dental technicians. Am. J. Ind. Med., 2006. © 2005 Wiley-Liss, Inc. [source] Provisional restoration options in implant dentistrAUSTRALIAN DENTAL JOURNAL, Issue 3 2007RE Santosa Abstract Unlike their use in conventional crown and bridge, provisional restorations during implant therapy have been underutilized. Provisional restorations should be used to evaluate aesthetic, phonetic and occlusal function prior to delivery of the final implant restorations, while preserving and/or enhancing the condition of the peri-implant and gingival tissues. Provisional restorations are useful as a communication tool between members of the treatment team which, in most cases, consists of the restorative clinician, implant surgeons, laboratory technicians, and the patient. This article describes and discusses the various options for provisionalization in implant dentistry. Clinicians should be aware of the different types of provisional restorations and the indications for their use when planning implant retained restorations. [source] Breast pathology guideline implementation in low- and middle-income countries,CANCER, Issue S8 2008Shahla Masood MD Abstract The quality of breast healthcare delivery and the ultimate clinical outcome for patients with breast cancer are directly related to the quality of breast pathology practices within the healthcare system. The Breast Health Global Initiative (BHGI) held its third Global Summit in Budapest, Hungary from October 1 to 4, 2007, bringing together internationally recognized experts to address the implementation of breast healthcare guidelines for the early detection, diagnosis, and treatment in low-income and middle-income countries (LMCs). From this group, a subgroup of experts met to address the specific needs and concerns related to breast pathology program implementation in LMCs. Specific recommendations were made by the group and process indicators identified in the areas of personnel and training, cytology and histopathology interpretation, accuracy of pathology interpretation, pathology reporting, tumor staging, causes of diagnostic errors, use of immunohistochemical markers, and special requirements to facilitate breast conservation therapy. The group agreed that the financial burden of establishing and maintaining breast pathology services is counterbalanced by the cost savings from decreased adverse effects and excessive use of treatment resources that result from incorrect or incomplete pathologic diagnosis. Proper training in breast pathology for pathologists and laboratory technicians is critical and provides the underpinnings of programmatic success for any country at any level of economic wealth. Cancer 2008;113(8 suppl):2297,304. © 2008 American Cancer Society. [source] Estimating GFR in children with 99mTc-DTPA renography: a comparison with single-sample 51Cr-EDTA clearanceCLINICAL PHYSIOLOGY AND FUNCTIONAL IMAGING, Issue 3 2010Henrik Gutte Summary Glomerular filtration rate (GFR) measurement by 51Cr-ethylenediaminetetraacetic acid (EDTA) and blood sampling in children is usually cumbersome for the patient, parents and laboratory technicians. We have previously developed a method accurately estimating GFR in adults. The aim of the present study was to evaluate the accuracy of this non-invasive method in children. We calculated GFR from 99mTc-diethylene triamine pentaacetic acid (DTPA) renography and compared with 51Cr-EDTA plasma clearance of 29 children between the age of 1 month and 12 years (mean 4·7 years). The correlation between 99mTc-DTPA renography and 51Cr-EDTA plasma clearance was for all children R = 0·96 (n = 29, P<0·0001), for children above 2 years of age R = 0·96 (n = 18, P<0·0001) and for children <2 years R = 0·84 (n = 11, P<0·001). We conclude that assessment of GFR from 99mTc-DTPA renography is reliable and comparable to GFR calculated from 51Cr-EDTA plasma clearance. Because our method is non-invasive and only takes 21 min, it may be preferable in many cases where an assessment of renal function is needed in children especially when renography is performed anyhow. [source] | ||||||||||