Biomedical subjects

H Cardash

Publications and source records attributed to H Cardash.

4 recordsLinked to original sources

PubMed1997

Effect of irradiation time on tensile properties of stiffness and strength of composites.

PURPOSE: We compared the effect of irradiation time on the diametral tensile strength and stiffness of three visible light-cured composites. The sensitivity of the two mechanical properties to differentiate between the materials was also investigated. MATERIAL AND METHODS: Cylindrical specimens of three composites were cured for 20, 40, 80, and 120 seconds (n = 10) and loaded up to failure in a diametral tensile strength test. Stiffness and diametral tensile strength values were recorded. RESULTS: Irradiation time significantly influenced diametral tensile strength (p = 0.0017) and stiffness (p = 0.0002). With the same irradiation times the three tested materials demonstrated no significant difference when diametral tensile strength was studied (p = 0.31). However, stiffness values did show a significant difference (p = 0.0002). CONCLUSIONS: This study found that stiffness is more sensitive in disclosing differences in tensile properties between the materials than diametral tensile strength.

Bisphenol A-Glycidyl Methacrylate↗

PubMed1997

Isolation of Enterobacteriaceae from the mouth and potential association with malodor.

Bad breath is a common phenomenon, usually the result of bacterial metabolism in the oral cavity. It is generally accepted that Gram-negative bacteria are responsible for this problem, largely through degradation of proteinaceous substances. In initial experiments, screening of malodorous isolates following outgrowth of samples obtained from saliva, periodontal pockets, and the tongue dorsum yielded enterobacterial isolates. Clinical studies were conducted to examine the prevalence of such bacteria in four different populations: orthodontic patients, malodor clinic patients, complete-denture wearers, and a healthy young population. The prevalence of Enterobacteriaceae in the oral cavities of the denture-wearing population was very high (48.0%) as compared with the other groups: 27.1% in the malodor clinic patients, 16.4% in the normal population, and 13% among orthodontic patients. Isolates of Klebsiella and Enterobacter emitted foul odors in vitro which resembled bad breath, with concomitant production of volatile sulfides and cadaverine, both compounds related to bad breath. When incubated on a sterile denture, enterobacterial isolates produced typical denture foul odor. Isolates exhibited cell-surface hydrophobic properties when tested for adhesion to acryl and aggregation with ammonium sulphate. The results, taken together, suggest that Klebsiella and related Enterobacteriaceae may play a role in denture malodor.

Adolescent↗

PubMed1978

Combining final impressions with maxillomandibular relation records in stabilized record bases.

The postinsertion problems of complete denture prostheses are closely related to accurate recording of maxillomandibular relationships. It is essential that these recordings be made with stable record bases; making the final impressions within the record bases prevents movement and tilting. Face-bow and centric relation records properly orient the casts in the articulator. A method to obtain all of these records in one dental appointments has been described.

Dental Articulators↗

PubMed1978

The immediate overdenture. A case history.

A case is described of application of the immediate overdenture technique to restore function, speech and aesthetics in a patient with extreme resorption of the maxillary anterior residual ridge. In the opinion of the authors, retention of the roots of the remaining teeth most definitely contributed to the retention, stability and overall success of the denture (Figs. 9, 10).

Denture, Complete, Immediate↗