Search PubMed⌕ Search

Biomedical subjects

L Lorton

Publications and source records attributed to L Lorton.

At least 37 records · Page 2Linked to original sources
PubMed1986

Exposure reduction of 96% in intraoral radiography.

This study compared the diagnostic quality of E-speed film, xeroradiographic cassettes, and a screen-film imaging system used in medical radiology. The surfaces of defects simulating caries were scored for the presence and depth of the defects under ideal viewing conditions by independent observers. Receiver Operator Characteristics analysis of the data showed no significant differences regarding diagnostic potential among the three systems. The true-positive fraction was 1.00 for all systems and all operators, and the false-positive fraction was .011, .011, and .007, respectively. An exposure of 5.5 mR was used to produce images with the screen-film combination, and 150 mR was used for standard dental systems. This study showed that an exposure reduction of 96% is possible while maintaining high-quality radiographs for the diagnosis of caries.

Dental Caries↗
PubMed1986

Design and use of a computer-assisted postmortem identification system.

The organization and rationale for the design of a computer-assisted postmortem identification system are discussed along with results of the use of this system in extensive simulation trials on a database of 578 records. The selectivity of dental characteristics is so great that any individual with 4 or more characteristics (either fillings or missing teeth), can be separated from a group of 578 people for final verification of the identity match. The effects of errors in the database are discussed and the actual effects of different error rates on identification are shown. Error rates of up to 30% have only small effects on the ability of the system to pick out correct identity matches. The system is presently implemented on a portable microcomputer, a representative desktop computer, and a large minicomputer. The present efforts include statistical analysis of an enlarged database and testing of a data acquisition system to allow the building of a large identification database (25 000 records) in a quick and economical manner.

Computers↗
PubMed1986

Decision-making concepts in postmortem identification.

Concepts of the decision-making process in mass casualty identification are discussed. The importance of the correct data type, the correct data format, and the appropriate decision paths are emphasized. Also discussed are the hidden dangers in the use of changeable physical characteristics for sorting factors. A suggested decision process for use in postmortem identification is outlined, along with its application to computer-assisted identifications.

Computers↗
PubMed1985

The incidence of unerupted permanent teeth and related clinical cases.

The impacted or mal-erupted tooth and its associated pathosis provide great diagnostic challenges to the dentist. The frequency of occurrence of impaction was found to be over 10,000 in 5,000 Army recruits. The type and position of impaction are summarized in tables. The incidence of impactions was higher than previously reported and may reflect some sampling bias. The incidence of impacted second and fourth molars is higher than expected. Impactions or mal-eruptions were seen to involve every permanent tooth except the mandibular incisors and first molars. Impactions can occur because of malpositioning of the tooth bud or obstruction in the path of eruption. However, the exact mechanism is still unknown. Six unusual cases of impacted permanent teeth are described to illustrate the importance of panoramic radiographs in the discovery of some anomalously located impactions.

Adolescent↗
PubMed1985

Gemination and twinning in the permanent dentition.

Gemination and twinning are uncommon developmental anomalies of the hard dental tissue. These aberrations are manifested either as anomalous teeth or as supernumerary teeth. Six cases of gemination and twinning are presented in this article. A simplified classification of these anomalies has been suggested.

Adolescent↗
PubMed1984

A review of the incidence of pain after an operation treatment visit: Part I.

This review presented some typically encountered painful sequellae from routine restorative dental treatment. A brief description of the importance of Tomes' processes and free nerve endings were mentioned also. This review should serve as a background for a clinical study concerning posttreatment pain that will be described in a later article.

Dental Restoration, Permanent↗
PubMed1983

The antibacterial effects of calcium hydroxide apexification pastes on Streptococcus sanguis.

Four calcium hydroxide-based apexification pastes were tested for their antibacterial effects on Streptococcus sanguis. Their zones of growth inhibition on blood agar plates were measured at 2, 4, 6, and 8 days. Only the camphorated parachlorophenol and the metacresylacetate pastes showed zones of inhibition. Both of these zones of inhibition decreased with time; however, the zones of inhibition for the parachlorophenol paste decreased at a slower rate.

Calcium Hydroxide↗
PubMed1983

Bifid mandibular nerve as a possible cause of inadequate anesthesia in the mandible.

Failure to achieve complete mandibular anesthesia is a problem that often occurs. The explanations include faulty anesthetic solutions, faulty technique, and anatomic or physiologic variations. Bifurcation of the mandibular nerve, rarely mentioned in the literature, may be a cause of inadequate anesthesia in a small percentage of cases.

Adolescent↗
PubMed1983

Diagnosis of the aesthetic components of the mandibular anterior prosthesis.

This paper explores seven different factors which should be considered when prescribing the lower anterior prosthesis: alignment as seen from the incisal; height of the incisal edges; degree of irregularity of the teeth; character of the incisal edge; height of the cuspid; mesio-incisal angle of the cuspid; and ridge coverage. The weights and variations of these different factors are discussed and suggestions made for a complete work authorization.

Cuspid↗