Dental Roentgenography Research Articles

Tumoral calcinosis: seasonal biochemical studies and chemical studies of eyelid lesion.

We recently described (Arch Ophthalmol 1988; 106:725-6) the presence of unique calcific lesions in the eyelids of a young woman with a history of hyperphosphatemic tumoral calcinosis. Here we document that no immediate family members showed similar lesions and that none was hyperphosphatemic. Dental roentgenography revealed characteristic abnormalities in the patient that confirmed the clinical diagnosis of tumoral calcinosis. Seasonal biochemical studies demonstrated persistently increased concentrations of phosphorus and 1,25-dihydroxyvitamin D in her serum. A calcific eyelid excrescence removed from the patient, studied by x-ray diffraction, was found to consist of crystals of hydroxyapatite. Microprobe analysis indicated the major elements in the deposit to be Ca, P, S, and Cl, just as in the periarticular deposits found in tumoral calcinosis. The Ca concentration in the patient's tear fluid, measured by atomic absorption spectrometry, was within the range found in tears of healthy volunteers. Phosphorus was undetectable (less than 30 mumol/L) in tears of the patient and the volunteers. These findings suggest that the eyelid lesions represent a new manifestation of the pathological process that produces the characteristic periarticular calcific masses of tumoral calcinosis.

歯牙撮影時の被曝線量の軽減について

As ICRP Publication 16 recommends, the roentgenography should be carried out in exposure to the patient as low as practical. With this respect, in order to reduce the patient dose, dental roentgenography with the intensifying screen was tried. With preliminary experiment it was concluded that the existing screens would be useless for dental roentgenography, because of its great lack of sharpness in image. New intensifying screen (Kyokko BF) which was manufactured with trial by Dainippon Toryo Co., Ltd. would substitute as the non-screen film dental roentgenography when the sharpness of the image is not stirictly required. When BF screen is applied to dental roentgenography exposure is about 80% less as compared with that in the case of non-screen dental roentgenography. The authors acknowledge Professor Dr, Toru Oka, Department of Oral Surgery, Nagoya University school of Medicine, for his kind advice to this research work.

The effect of protective aprons in dental roentgenography

Measurements were made of gonadal radiation while full-mouth dental roentgenograms were being taken of sixty adult male subjects. Radiation to the gonads was greater when the short pointed cone was used than when the long open-ended cone was used. Lead protective aprons significantly reduced the radiation to this area, and little difference was seen between the ability of the bib and lap aprons to provide gonadal protection.

Absent Lamina Dura Associated With a Developmental Dentin Abnormality

IT IS OUR purpose to report a family study of an undescribed clinical entity of a dentin abnormality associated with absence of lamina dura which superficially resembled hyperparathyroidism. It is usually considered that the loss of the lamina dura is pathognomonic of hyperparathyroidism although some degree of loss may be apparent in osteomalacia and in Paget's disease. 1 We have recently had the opportunity to observe a father and son with generally absent lamina dura, periapical osteolytic lesions of the jaw, indistinct trabecular pattern of the mandible, calcification of the root canals, minimal opalescent dentin, and abnormal morphology of the root dentin. A second son, age eight, presented a classical gross appearance of opalescent dentin; however, there was no evidence of attrition, and both root canals and lamina dura were normal. Evaluation of the mother and two sisters revealed no dental abnormalities. Dental roentgenography may suggest hyperparathyroidism by the following:

Dental roentgenography of high magnification. 1. Indirect roentgenography of 6-times magnification.

Dental roentgenography of high magnification. 1. Indirect roentgenography of 6-times magnification.

How hazardous is dental roentgenography?

A search was made of dental and medical literature to determine the various clinically proven biologic effects that x radintion can produce in the human body, the amount of radiation necessary to produce effects in the various tissues, and the amount of radiation that reaches the tissues when dental examinations are made with x rays. From this, the degree of hazard associated with dental x-ray examinations was assessed. A survey of the past 40 years failed to disclose any clinical evidence that would seriously condemn the practice of dental roentgenography when used in an intelligent manner, as being unsafe for either patient or dentist. No instances of burns or malignancy from dental diagnostic x-ray procedures have been reported. The few documented incidents of untoward biologic effects that occurred in the past when dental patients were exposed to larger amounts of x radiation are less likely to be repeated among patient s today because of the far smaller amounts of x radiation that presently are employed. A statistical study of the longevity of dentists indicated that dentists live almost 3 years longer than white nondentists, thus the dentist's life expectancy has not suffered either because of occupational exposure to radiation. (H.H.D.)

Hazards in Roentgenography: Are Dental X-rays Really Dangerous?

1. The nature of the damage produced by exposure to ionizing radiation has been discussed and it has been pointed out that the effects of most consequence, that is, those on the genetic material, are irreparable and should be avoided. 2. Unfortunately, overexposure is the rule rather than the exception today during dental roentgenography. 3. However, with the use of proper techniques, dental x-rays can be used in diagnosis without undue hazard to either the dentist or his patients.

A cylinder cone for dental roentgenography

The use of a restricted beam of radiation when serial roentgenograms of small areas are to be made is suggested. The diagnostician benefits from a roentgenogram that has increased definition, and the patient is subjected to less tissue irradiation. The construction of a simple, inexpensive cylinder cone of practicable dimensions is described.

A discussion of federal specifications GG-X-620 and L-F-310 for dental x-ray apparatus and dental x-ray film

An analysis of two federal specifications indicates that Federal Specification GG-X-620, December 7, 1954, for dental x-ray apparatus should be modified to align it with current trends in dental roentgenography, and that Federal Specification L-F-310, May 9, 1958, for dental x-ray film, is an excellent document based on specifications of the American Standards Association.

Simplifying and improving intraoral dental roentgenography

Simplifying and improving intraoral dental roentgenography

Radiation hazards associated with dental roentgenography.

(1959). Radiation Hazards Associated with Dental Roentgenography. American Industrial Hygiene Association Journal: Vol. 20, No. 2, pp. 118-120.

The Management of Pregnant Patients in Dental Practice

1. It is imperative to avoid anoxic episodes in the mother. 2. The optimal time for dental treatment is within the fourth through the seventh months of pregnancy. 3. Only procedures necessary to relieve pain or discomfort, or of other emergency nature, should be undertaken in the first 3 months of pregnancy. 4. Long, complicated, elective procedures should be postponed until after the termination of pregnancy. 5. In the normal pregnant patient, dental roentgenography presents no special hazards. 6. Appointments or sittings should be short, preferably not to exceed about ½ hour. 7. Pain should be avoided. 8. Home care should be emphasized in the general maintenance of good oral hygiene. 9. Oxygen in an administrable form should be on hand at all times. The presence of the expectant mother in the dental chair gives us an opportunity to impress upon her the importance of the care of children's teeth as they grow older. We should enlighten the mother-to-be concerning the benefits of water fluoridation, so that the citizen in utero gets 9 months of good dental prophylaxis. The expectant mother should and must get proper dental care during pregnancy. It behooves us as dentists to see that this is accomplished.

Radiation dose reduction by higher voltage dental roentgenography

Radiation dose reduction by higher voltage dental roentgenography

Need for precaution in dental roentgenography

Need for precaution in dental roentgenography

Radiation hazards from the use of dental x-ray units.

For many years x-rays have been used in the dental profession as a diagnostic tool. X-rays cannot immediately be felt or seen, and therein lies the hazard attending their use. What cannot be sensed is often ignored and, through unconcern and neglect, an exposure resulting in biological impairment or damage may result. It was for this reason that an investigation of the potential hazard occurring during dental roentgenography was undertaken. Instruments and Technics The primary standard employed to measure x-ray dosages in the voltage range common in dental practice (50–75 kv.) was the Victoreen condenser r-meter and thimble chamber. To supplement these measurements, two types of special monitoring film (Dupont No. 552 and No. 558), as well as a portable ionization chamber, were used. The density of the test exposure film was compared directly with the density on standard exposure films by means of a Photovolt densitometer. All dosages or dosage rates are expressed in roentgens (r). The presently accepted ...

Dental Manifestations of Systemic Disease

HomeRadiologyVol. 58, No. 6 PreviousNext EditorialDental Manifestations of Systemic DiseasePublished Online:Jun 1 1952https://doi.org/10.1148/58.6.883MoreSectionsPDF ToolsImage ViewerAdd to favoritesCiteTrack CitationsPermissionsReprints ShareShare onFacebookTwitterLinked In AbstractIn the current issue of Radiology there appears the last of a series of three articles on the Dental Manifestations of Systemic Disease. In a painstaking study, the author has collected and classified the lesions of the jaws and teeth which indicate to the trained observer the presence of developmental disturbances or generalized disease processes, demonstrating the great importance of dental roentgenography not only to the dentist but also to the clinician and the roentgenologist.The pathological changes which are depicted on the roentgenogram may involve the bony supporting structure, the teeth, and the tooth sockets. Changes in the bony structure of the jaws are often similar or identical to disease changes in the general skeleton, and minimal distortion of the trabecular pattern as revealed on intraoral roentgenograms should lead to a complete study of the other skeletal areas.In the first paper of the series the author calls attention to the fact that the development of the teeth generally conforms to chronologic skeletal development and can be used as an index in determining the approximate skeletal age. He then proceeds to show the dental manifestations of the various endocrine disturbances, citing cases and illustrating them with dental roentgenograms.The second installment concerns developmental disturbances which are manifested orally by faulty dental structure, interference with normal eruption of the teeth, and malocclusion. Most of the conditions which affect dentition are those which primarily involve the skeleton. Rarely the dental defects may be of ectodermal origin, such as ectodermal dysplasia, in the severest form of which there may be total dental aplasia. In advanced cases the dental changes may not be necessary for a diagnosis, but in mild cases they may provide the first clue to recognition of the condition.In the third and current portion of this series, attention is called to the Hutchinson teeth of congenital syphilis, probably one of the earliest characteristic dental defects to be noted. The bone changes in the jaws which are present in some of the reticulo-endothelial diseases are of unusual interest. Paget's disease also produces characteristic changes in the jaws which may be one of the earlier evidences of this condition. Metabolic diseases are manifested both through developmental changes and changes in mineralization. Radiation necrosis of the jaw is, of course, a matter of particular concern to all radiologists.In the April issue of Radiology, there appeared also an article by Robinson and Sarnat devoted to the bone changes in the jaws of 22 patients with sickle-cell anemia. Significant osteoporosis was found in 18 cases in this series.These demonstrations of the relationship between the dental changes shown on the roentgenogram and generalized abnormalities and diseases are of unusual interest.Article HistoryPublished in print: June 1952 FiguresReferencesRelatedDetailsRecommended Articles RSNA Education Exhibits RSNA Case Collection Vol. 58, No. 6 Metrics Altmetric Score PDF download

Dental Roentgenography II: Vertical Angulation, Film Placement and Increased Object-Film Distance

Dental Roentgenography II: Vertical Angulation, Film Placement and Increased Object-Film Distance

Dental Roentgenography I: An Investigation in Adumbration, or the Factors that Control Geometric Unsharpness

Dental Roentgenography I: An Investigation in Adumbration, or the Factors that Control Geometric Unsharpness

A Simple Way to Produce Consistently Accurate Intraoral Roentgenograms and a Modification of the Technic of Dental Roentgenography

A Simple Way to Produce Consistently Accurate Intraoral Roentgenograms and a Modification of the Technic of Dental Roentgenography

Advantages of a Rigid Film Technic in Dental Roentgenography

Advantages of a Rigid Film Technic in Dental Roentgenography