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Biomedical subjects

D E Cutright

Publications and source records attributed to D E Cutright.

At least 37 records · Page 2Linked to original sources
PubMed1976

Tissue pressure under complete maxillary dentures.

This preliminary report has shown the following interesting points: (1) Measurements of tissue pressures beneath dentures are possible using the Sanborn 350 recorder. (2) Stable dentures produce high pressures on the supporting tissues and transmit these pressures from region to region, varying with how the patient uses the dentures. (3) Most often, an opposite large or negative pressure immediately followed the production of positive pressure at the same site beneath the denture. Thus, each movement actually traumatizes the tissue twice. (4) Nonmasticatory pressures produced under dentures are as great as or greater than masticatory pressures. (5) Wave forms for each biting maneuver or sound produced can be charted and are typical for each patient, probably representing denture movement. (6) Swallowing unassociated with eating or drinking produced very high positive and very low negative pressures, giving the greatest ranges of pressures recorded in this experiment. (7) Smoking (recorded in only one patient) also produced a great range of pressures. (8) Sticky foods such as cheddar cheese produced greater negative pressures than the other foods tested. (9) The one patient with natural teeth opposing his denture gave much more uniform and lower pressures than did the patients with complete dentures. (10) This method allows visualization of pressure movement under dentures. The effect of these continually occurring, nonmasticatory, induced pressure changes and pressure waves beneath the dentures may well be of greater significance than that of mastication.

Adult↗
PubMed1976

Histopathologic findings in third molar opercula.

This review of 130 opercula revealed the following findings: 1. In nine cases, salivary gland tissue was present in variable amounts. 2. The oral epithelium was unremarkable, except for eleven cases of atypia, most likely benign atypia resulting from trauma and inflammation. 3. Odontogenic-type epithelium was found in sixty cases. None showed unusual proliferation, but two cases were of a clear-cell type. 4. The lining epithelium was variably present and was either simple squamous, cuboidal, columnar, or stratified squamous in type. 5. Fifty-four cases were found which showed either bone, dentin, osteoid, or focal odontodysplasia in the tissue, including one case that showed a structure identical to a periodontal membrane encircling it. 6. The lining epithelium on the ISO was often completely absent. This was true with almost no inflammation as well as with marked inflammation present. The soft-tissue overlying erupting third molar teeth contains a host of different tissues. Many of these have the propensity to undergo proliferation, neoplastic change, or cause postoperative complications and delay healing. Therefore, it is my opinion that all such tissue removed be subjected to histopathologic review. Furthermore, surgeons should be aware of the possible neoplastic potential and the detrimental healing effects of these various tissues if an operculum is used for primary closure.

Epithelium↗
PubMed1976

Findings in 1,724 buccal smears from dentists.

No changes were found in the epithelial cells from the buccal mucosa of dentists with the use of the light microscope, electron microscope, or electron probe that could be correlated with mercury exposure under the conditions of this test. In a normal population it can be expected that at least 0.01% of the population will show class 2 atypical smears. Patients with class 2 smears have fewer highly matured epithelial cells (tendency toward keratinization) of the buccal mucosa and hence a thinner epithelium.

Dentists↗
PubMed1976

Mercury: its relation to the dentist's health and dental practice characteristics.

Mercury and 12 clinical chemical determinations were done on the blood samples of 1,555 dentists. The dental practice characteristics of each participant were determined by questionnaires. Seventy-seven percent of all the dentists displayed blood mercury values in the range 0 to 10 ng/ml. The mean for all dentists was 8.2 ng Hg/ml blood. The means for general dentists and specialists were 8.8 and 6.3 ng Hg/ml blood, respectively. Overall, no significant correlations were found in a comparison of blood mercury levels with clinical chemical data and with dental practice characteristics. However, general practitioners with higher blood mercury values tended to show dental practice characteristics that were conducive to producing the higher values found. The data indicate that dentists in the United States, as a group, practice good mercury hygiene.

Blood Chemical Analysis↗
PubMed1976

Microbial contamination of dental units and ultrasonic scalers.

Microbial contamination of the water system in 12 dental units and nine ultrasonic scalers was investigated. Water samples from ultrasonic scalers, high-speed handpieces and water syringe lines showed microbial concentrations of up to 2.6 million, 3.3 million and 190,000 colony forming units/ml respectively. Flushing the lines for 2 minutes reduced the microbial levels, but complete elimination of all bacteria was not achieved. The infectious potential of contaminated water, to the dentists and patients, particularly the compromised host is discussed.

Dental High-Speed Equipment↗
PubMed1976

A survey of factors possibly associated with cervical abrasion of tooth surfaces.

The study indicates that cervical abrasion is related in some way to a factor or factors associated with the initial stages of the tooth-brushing procedure. The evidence, furthermore, demonstrates that an excessive use of dentifrice habitually placed, undiluted, on the same area of the mouth, may produce the abrasion. In view of this evidence, it would seem prudent to advise patients to use decreased quantities of dentifrice and to initiate the brushing procedure on the occlusal surfaces of the teeth to effect a dilution of the dentrifrice. The same effect might be accomplished by alternating the initial placement of the brush between the quadrants to more evenly distribute the abrasive effect. The high percentage of these lesions found in this young age group demonstrates a higher prevalence of the lesion in a younger age group than was previously suspected. We can further conclude that cervical abrasion is related to age and gingival recession. Furthermore, the study indicates that patients who exhibit cervical abrasion have less plaque and the lower bleeding scores than those who do not.

Adolescent↗
PubMed1975

A comparison of iliac marrow and biodegradable ceramic in periodontal defects.

Defects were created in the tooth-supporting bone of six beagle dogs. Biodegradable tricalcium phosphate was compared to cancellous marrow as a treatment method. The findings indicated that ankylosis and resorption of the tooth can occur when using marrow. The ceramic-filled defects healed slower; but the material itself was well tolerated by the tissues, initiated new bone formation, filled in the defect, and has good potential for the treatment of advanced periodontitis.

Animals↗
PubMed1975

An investigation of the clinical and histologic effects of selected dentifrices on human palatal mucosa.

A study was undertaken in 24 human volunteer subjects to determine the possible effects of selected commercially available dentifrices on clinically normal masticatory mucosa. An acrylic stent was fabricated which was designed to hold four test dentifrices in close apposition to the palatal tissues for 1 hour. Evaluation approximately 8 hours later revealed pathologic responses which were evident clinically and histologically. 1. Clinically, palatal tissues exposed to Crest were not distinguishable from control areas, while Colgate (mfp), MacCleans, and Ultra Brite produced erythematous changes which were statistically significant when compared with adjacent control sites. 2. Histologically, epithelial changes were seen within the test sites which ranged from a parakeratin-like surface layer to necrosis and intraepithelial abcess formation. Control sites consisted of normal orthokeratinized palatal mucosa in all cases. 3. The more severe microscopic reactions were noted with MacCleans and Ultra Brite, while the milder reactions were associated with Colgate (MFP). Crest infrequently produced a parakeratin-like response. The response was not statistically significant when compared with controls. 4. The clinical and histologic reactions were generalized throughout the test population, suggesting that the responses were not due to individual hypersensitivity but due to irritation from one or more of the dentifrice components. Although the clinical significance of these findings could not be readily assessed, the potential for irritation of human palatal mucosa by selected dentifrices has been demonstrated. These findings support the suggestion by the World Workshop in Periodontics (1966)20 that efforts should be directed to the development of dentifrice materials less harsh to the oral tissues.

Connective Tissue Cells↗