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Dental Fillings (dental + filling)
Selected AbstractsTransparent Nanocomposites of Radiopaque, Flame-Made Ta2O5/SiO2 Particles in an Acrylic Matrix,ADVANCED FUNCTIONAL MATERIALS, Issue 5 2005H. Schulz Abstract Mixed Ta2O5 -containing SiO2 particles, 6,14,nm in diameter, with closely controlled refractive index, transparency, and crystallinity are prepared via flame spray pyrolysis (FSP) at production rates of 6.7,100,g,h,1. The effect of precursor solution composition on product filler (particle) size, crystallinity, Ta dispersity, and transparency is studied using nitrogen adsorption, X-ray diffraction, optical microscopy, high-resolution transmission electron microscopy (HRTEM), and diffuse-reflectance infrared Fourier-transform spectroscopy (DRIFTS). Emphasis is placed on the transparency of the composite that is made with Ta2O5/SiO2 filler and dimethylacrylate. Increasing Ta2O5 crystallinity and decreasing Ta dispersity on SiO2 decreases both filler and composite transparencies. Powders with identical specific surface area (SSA), refractive index (RI), and Ta2O5 content (24,wt.-%) show a wide range of composite transparencies, 33,78,%, depending on filler crystallinity and Ta dispersity. Amorphous fillers with a high Ta dispersity and an RI matching that of the polymer matrix lead to the highest composite transparency, 86,%. The composite containing 16.5,wt.-% filler that itself contains 35,wt.-% Ta2O5 has the optimal radiopacity for dental fillings. [source] The comparison of the effects of three types of piezoelectric ultrasonic tips and air polishing system on the filling materials: an in vitro studyINTERNATIONAL JOURNAL OF DENTAL HYGIENE, Issue 4 2007T Arabaci Abstract:, Aim:, The aim of this study was to evaluate the effect of air polishing and different ultrasonic scaler inserts on dental fillings, such as amalgam, composite and porcelain. Materials and methods:, This study was performed on amalgam, composite and porcelain samples. The surfaces of the samples were exposed to different type of piezoelectric ultrasonic scaler inserts and air-abrasive unit. The scaler inserts were Instrument A, Instrument PS and PI. The roughness of the surfaces of each sample were measured with a profilometer and observed by stereomicroscope. Results:, The stereomicroscopic images and profilometric values showed that Instrument A and PS resulted in rough surfaces, such as chips, nicks and scratches on the amalgam, composite and porcelain surfaces. The Instrument PI roughened the amalgam surface, but it did not roughen the porcelain or composite surfaces. The profilometric measurements (Ra) showed that the roughness of the surfaces depending on air polishing was less than the ultrasonically scaled surfaces. Conclusion:, The wrong tip applications during dental scaling procedure cause roughness, such as scratches, nicks or chips, not only on the teeth surfaces but also on the filling materials. Thus, dental scaling procedure on the restorations should be performed carefully and the roughness sites on the restorations have to be re-polished after scaling to prevent plaque accumulation. [source] The capacity of dental therapists to provide direct restorative care to adultsAUSTRALIAN AND NEW ZEALAND JOURNAL OF PUBLIC HEALTH, Issue 5 2009Hanny Calache Abstract Introduction: In Victoria, dental therapists are restricted to treating patients under the age of 26 years. Removing this age restriction from dental therapists' scope of practice may assist significantly in addressing workforce shortages, particularly in rural Victoria. Objectives: This study aims to assess the capacity of dental therapists to provide direct coronal restorations (dental fillings) to patients older than 25 years, on the prescription of a dentist. Its objectives include determining the success rate of restorations placed by dental therapists six months post placement; and patients' and dental therapists' satisfaction with the services provided. Methods: The project was carried out in 2007 at the Royal Dental Hospital of Melbourne. Seven dental therapists participated in the study, placed 356 restorations (115 patients) with the support of a dentist. These restorations were reviewed six-months post placement by dentists blinded as to which restorations were placed by the dental therapists. Patients' age ranged from 26 to 82 years (82% were >40 years). Results: At six months post-treatment, 258 restorations (80 patients) were reviewed. At review, 94.6% of the restorations were successful. Patients and dental therapists were satisfied with the experience. Conclusions: The standard of restorations provided by dental therapists was considered to be at least similar to that expected of a newly graduated dentist. Implications: Broadening the dental therapists scope of practice would create opportunities to design more flexible ,oral health' clinical teams enabling dentists to provide more complex procedures for patients most in need. This is significant in the public sector and rural areas where workforce shortages are most acute. [source] Risk indicators of edentulism, partial tooth loss and prosthetic status among black and white middle-aged and older adultsCOMMUNITY DENTISTRY AND ORAL EPIDEMIOLOGY, Issue 5 2001Teresa A. Dolan Abstract ,Objectives: To describe the prevalence and risk indicators of edentulism; to describe the frequencies of wearing removable dentures; to describe the prevalence and risk indicators of fixed prosthetic restorations; to test the hypothesis that fixed prosthetic restorations are most likely to have been placed in persons at lower risk for dental and periodontal diseases, and to test the hypothesis that, with dental disease, dental behaviors, dental attitudes and ability to afford crowns taken into account, blacks are less likely than whites to have received crowns. Methods: The Florida Dental Care Study is a cohort study of subjects 45 years old or older. A telephone screening interview was done as a first stage to identify 5254 subjects who met eligibility requirements and who self-reported whether they were edentulous. In a second stage, a subsample of dentate subjects was contacted after they completed their telephone screening interview. Of these, 873 subjects completed a baseline in-person interview and dental examination. Results: A total of 19% of first-stage subjects were edentulous. In a single multiple logistic regression, having a poorer self-rated level of general health was significantly associated with edentulism, as were being poor, older and white. Among the second-stage participants (all of whom were dentate), several prosthetic patterns were observed. For example, a total of 64% of maxillary full denture wearers reported wearing their denture all the time. Participants had also received numerous fixed prosthodontic services. The proportion of subjects with at least one crown varied widely by subject characteristics. Conclusions: A substantial percentage of non-ideal frequencies of wearing removable prostheses was reported, as were prosthesis-related soreness and broken prostheses. Although we expected and observed an association between having a fixed prosthetic crown and periodontal status, dental fillings, dental attitudes and financial resources, a residual association with race suggests that blacks are much less likely to receive prosthetic crowns. The several possible reasons for this circumstance warrant further investigation. [source] | ||||||||||