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At least 37 records · Page 2Linked to original sources
PubMed1990

[The legislative requirements for radioprotection in dental offices equipped with apparatus for dental radiodiagnosis and orthopantomography].

The paper summarises the new legislation which is expected to be introduced concerning the use of dental radiodiagnostic and orthopantomographic equipment. The above modifications are partly the responsibility of the employer responsible for the dental practice, the qualified expert and, if present, the authorized doctor. A summary is given of the development of Italian regulations which are being brought into line with EEC standards.

Dental Offices↗
PubMed2002

[Usefulness of postmortem dental panoramic X-ray photographs taken using a portable radiography apparatus for dental identification].

Fourteen unidentified human corpses were subjected to personal identification between 1999 and 2001. They included 5 drowning victims, three extensively burnt bodies, three skeletonized bodies, two highly putrefied bodies, and a body that had been run over by a train. Antemortem dental records were available in 12 cases, and all were positively identified. For 10 of these cases, antemortem panoramic X-ray photographs were obtained. For postmortem examination, panoramic X-ray photographs were taken using a portable dental panoramic radiography apparatus, LPX7007 (ASAHI ROENTGEN, Japan), during autopsy. Comparison of the ante- and postmortem panoramic X-ray photographs gave accurate and useful information not only about dental treatment but also the anatomical features surrounding the upper and lower jaws. This method is not time-consuming and also has the advantage of allowing dental treatment to be examined extraorally in cases where it is difficult to open the mouth of the corpse.

Forensic Anthropology↗
PubMed1999

Development of a compact computed tomographic apparatus for dental use.

OBJECTIVE: To describe a compact computed tomographic apparatus (Ortho-CT) for use in dental practice. METHODS: Ortho-CT is a cone-beam-type of CT apparatus consisting of a multifunctional maxillofacial imaging machine (Scanora, Soredex, Helsinki, Finland) in which the film is replaced with an X-ray imaging intensifier (Hamamatsu Photonics, Hamamatsu, Japan). The region of image reconstruction is a cylinder 32 mm in height and 38 mm in diameter and the voxel is a 0.136-mm cube. Scanning is at 85 kV and 10 mA with a 1 mm Cu filter. The scan time is 17 s comparable with that required for rotational panoramic radiography. A single scan collects 512 sets of projection data through 360 degrees and the image is reconstructed by a personal computer. The time required for image reconstruction is about 10 min. RESULTS: The resolution limit was about 2.0 lp mm-1 and the skin entrance dose 0.62 mGy. Excellent image quality was obtained with a tissue-equivalent skull phantom: roots, periodontal ligament space, lamina dura, and cancellous bone were clearly visualized. CONCLUSION: Ortho-CT provides three-dimensional images of excellent quality for dental use at a low entrance dose.

Humans↗
PubMedDate not supplied

[Electric dental analgesia apparatus with increased stabilization of the operating current].

To improve the construction of the existing (formula: see text) apparatus intended for relief of pain during treatment of hard dental tissues a new version of this unit with a higher stabilization of the operating current--model (formula: see text) -- has been designed. In it the intensity of the current is adjustable within the range of 1 to 30 micronA. Power supply from the mains and from the storage battery "Krona" is provided for in the apparatus.

Anesthesia, Dental↗
PubMed2000

[A study on application of multiple jointed contact-type measuring apparatus for dental use].

The measurement of oral maxillofacial region, including dentition and teeth, is important information for diagnosis and assessment of treatment in clinical dentistry. There are two kinds of the measuring systems, i.e., contact-type system and non-contact-type system. The latter mainly has been investigated in dentistry, because of its simplicity and quickness for measurement. However, since the objects in dentistry have complex shapes with curved surfaces and many dead angles, accuracy of values obtained by this system is insufficient for clinical use. Even though divided measurement is employed to overcome the problems, the increase of measuring element results in deterioration of the accuracy. In the present study, the accuracy of a contact-type measuring apparatus with 5 pivoting joints was investigated. For the cavity model, the depth and the width were measured. For the standardized dental cast which consists of three spheres, the diameter of three spheres and the distance of each sphere were measured. The values obtained by this apparatus were compared with those obtained by the precise 3D-measurement apparatus. The differences were insignificant in the cavity model. Significant difference was found in the standardized dental cast. However, the difference was very small, and so it is negligible in clinical use. By using this apparatus, the form of undercut and teeth was reconstructed completely. The results suggested that the multiple jointed contact-type measuring apparatus could be applied to the measurement in clinical dentistry.

Dental Equipment↗