Biomedical subjects

M Torabinejad

Publications and source records attributed to M Torabinejad.

At least 91 records · Page 5Linked to original sources

PubMed1990

In vitro bacterial penetration of coronally unsealed endodontically treated teeth.

Forty-five root canals were cleaned, shaped, and then obturated with gutta-percha and root canal sealer, using a lateral condensation technique. The coronal portions of the root filling materials were placed in contact with Staphylococcus epidermidis and Proteus vulgaris. The number of days required for these bacteria to penetrate the entire root canals was determined. Over 50% of the root canals were completely contaminated after 19-day exposure to S. epidermidis. Fifty percent of the root canals were also totally contaminated when the coronal surfaces of their fillings were exposed to P. vulgaris for 42 days.

Cuspid↗

PubMed1990

Estimated radiation risks associated with endodontic radiography.

Endodontic patients are sometimes concerned about the risks of tumors or cataracts from radiation exposure during root canal therapy. By using established dose and risk information, we calculated the extent of these risks. The chance of getting leukemia from an endodontic x-ray survey using 90 kVp was found to be 1 in 7.69 million, the same as the risk of dying from cancer from smoking 0.94 cigarettes or from an auto accident when driving 3.7 km. Risk of thyroid gland neoplasia was 1 in 667,000 (smoking 11.6 cigarettes, driving 45 km) and risk of salivary gland neoplasia 1 in 1.35 million (smoking 5.4 cigarettes, driving 21.1 km). Use of 70 kVp radiography reduced these risks only slightly. To receive the threshold dose to eyes to produce cataract changes, a patient would have to undergo 10,900 endodontic surveys.

Cataract↗

PubMed1990

Endodontic mishaps: etiology, prevention, and management.

Root canal therapy consists of a cascade of scientifically-based technical procedures. Lack of knowledge, its poor application, or a compromise or a break in the chain of proper procedures can lead to a number of accidents which are collectively called 'endodontic mishaps'. These accidents can occur during diagnosis, access preparation, cleaning and shaping, obturation and post-space preparation. Those who perform root canal therapy must have a basic knowledge of etiologic factors and methods of prevention as well as recognition, management and prognosis. This knowledge reduces the rate of endodontic failures and increases our chances of saving more teeth.

Dental Cavity Preparation↗

PubMed1989

Absorbed radiation by various tissues during simulated endodontic radiography.

The amount of absorbed radiation by various organs was determined by placing lithium fluoride thermoluminescent chip dosimeters at selected anatomical sites in and on a human-like X-ray phantom and exposing them to radiation at 70- and 90-kV X-ray peaks during simulated endodontic radiography. The mean exposure dose was determined for each anatomical site. The results show that endodontic X-ray doses received by patients are low when compared with other radiographic procedures.

Dental Pulp Cavity↗

PubMed1989

An investigation on the safety of rewashed gloves.

Despite recommendations from the Department of Health and Human Services, some dental professionals are using rewashed gloves. To study the effects of repeated washings, latex gloves were washed up to 50 times and tested for defects before and after washing. Then, to investigate the safety of rewashed gloves, they were contaminated with either bacteriophage viruses or Staphylococcus epidermidis. After application of four commonly used hand-washing solutions, the contaminated gloves were washed one to five times and tested for residual organisms. Our results showed that one percent of the gloves had manufacturer's defects, and that repeated washings did not increase the incidence of these defects. Furthermore, in spite of significant reductions in the number of microorganisms on contaminated gloves after repeated washings, rewashed gloves remained infected with the test organisms. The results of this investigation indicate that rewashed gloves have the potential to cause cross-contamination.

Communicable Disease Control↗

PubMed1988