Browsing by Author "Katz, Simon, 1920-1987"

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    A Cephalometric study of velar stretch in 8 and 10-year old children
    (1974) Mourino, Arthur P.; Roche, James R.; Katz, Simon, 1920-1987; Bixler, David; Garner, La Forrest Dean, 1933-
    This investigation examined the prevalence, relative magnitude, and selected components of velar stretch in normal-speaking 8 and 10-year-old children. For twenty 8-year-old and twenty 10-year-old children, lateral cephalometric films were obtained under three conditions: (1) subject at rest, (2) subject sustaining the vowel /u/, and (3) subject sustaining the voiceless fricative /s/. The cephalometric films were traced on acetate paper and specific radiographic measurements were made to describe important facets of velar stretch in children. Data were obtained on the resting length of the soft palate, the antero-posterior depth of the pharynx, and the prevalence of velopharyngeal closure and/or the degree of velopharyngeal opening observed during selected speech utterances in normal-speaking 8 and 10-year-old children. Such information is expected to be useful to dentists, speech pathologists, and physicians who use lateral headplates to assess velopharyngeal adequacy. Velar stretch per se was not observed in all 40 normal-speaking children. During the production of /u/, 36 children (90%) exhibited velar stretch; for /s/, 32 children (80%) manifested stretch. Paired- comparison t-test results showed that the length of the soft palate measured during speech was significantly greater than its resting length in both 8 and 10-year-old children. Moreover, significantly more total velar stretch was found during the production of the vowel /u/ than during the production of the consonant /s/ in both 8 and 10-year-old children. Although there was a significant increase in the length of the entire soft palate during the functional activities of speech, no significant increase in the anterior portion of the soft palate was associated with speech. Analysis of variance techniques showed that 10-year-old children exhibited significantly greater velar stretch during both /u/ and /s/ utterances than did 8-year-old children. In addition, 10-year-old children exhibited significantly greater velar height and greater velar length characteristics during both /u/ and /s/ utterances than did 8-year-old. children. Correlation procedures were used to examine the relationships between velar stretch and other commonly employed cephalometric measures. These analyses indicated that although velar stretch was significantly correlated with a number of commonly employed cephalometric measures, the amount of velar stretch was not well predicted by any single cephalometric measure used in this research.
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    Effectiveness of oral hygiene instruction to parents of preschool cerebral palsy children
    (1974) Ditto, Roland R., 1943-; Roche, James R., 1924-; Katz, Simon, 1920-1987; Starkey, Paul E.; Koerber, Leonard G.; Barton, Paul
    The lack of an effective method for teaching oral hygiene procedures to parents of handicapped children prompted this investigation. Seventy-nine preschool cerebral palsy children were randomly distributed according to age and sex into three groups. The parents of these groups received the following instruction: Group I - written instructions for a detailed approach to oral hygiene maintenance in the home as if the child were without handicap; Group II - written instructions for a specialized approach to home oral hygiene maintenance with emphasis on two people providing the care, and mouth propping for access and stability of the arms and legs; Group III - no specific oral hygiene instructions. Each child in each group received a thorough oral examination and deposits of dental plaque were disclosed, numerically scored and recorded. Each parent of the three study groups participated in a written examination of dental knowledge at each visit. After each examination, the correct answers were given to the parent by both a verbal and written response. Parents and children returned at 90-day intervals. Variables such as transportation, surgery performed during the period of study, deteriorating health in the child, parental apathy about dental problems, and change in family job or location, reduced the sample from seventy-nine to fifty-four subjects, with data being obtained for pre- and post- examination periods. Both test group of parents significantly improved their dental knowledge scores after ninety days. However, none of the children decreased their plaque enough to show statistical significance. Perhaps there was some motivational improvement in the Group II parents, as they returned for the examination at a better rate, judged to be significant as compared to the other groups. Further investigation is recommended either to study the technique by itself without a time interval between scores or to evaluate the factors of intelligence, economic level, gravity of medical situation, and sibling support as they offset changes in behavior. Until then, it appears on the basis of this study that it is possible to increase the parent's knowledge of oral health but that changing the behavior of the parent actually performing the task is much more difficult.
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    Effects of chocolate milk on dental caries under mouth simulation conditions
    (1976) Simmons, Frederick H., Jr.; Katz, Simon, 1920-1987; McDonald, James L.; Koerber, Leonard G.; Barton, Paul
    Dietary recommendations concerning chocolate milk remain controversial since the effect of chocolate milk on the dental caries process is not clear. Cocoa with antibacterial and enamel-solubility-reducing properties may inhibit the formation of dental caries. Since chocolate milk contains a significant amount of sucrose (about 5 percent) and some cocoa (1 percent), laboratory testing of the cariogenicity of chocolate milk seems valuable. The present study investigated whether or not under mouth simulation conditions chocolate milk influenced the formation of dental caries compared to white milk. A control solution, four milk solutions and a milk solution with toothbrushing were tested over a 20-week experimental period. A mouth-like environment was established by constructing a mouth simulating device. One-hundred- and-sixty-two-teeth were mounted in the mouth simulator in six groups of 27 teeth each. Two independent evaluators had certified the teeth to be caries-free and a computer program was used to ensure complete randomization of the teeth in groups. After initial sterilization by ethylene oxide, the teeth were inoculated with a mixture of a culture of Streptococcus mutans and saliva. Each group was exposed to one of the milk formulations for a 15 minute period twice daily. After each period, a sterile bacterial medium was dripped (8 to 12 mls/hr) over the teeth in the mouth-like environment. After 20 weeks the teeth were separated, coded, and re-evaluated for pit and fissure caries by the same two evaluators. A statistical analysis by Repeated t Tests indicated the presence of three levels of relative cariogenicity: the chocolate milk group had the highest caries rate, the control group and the white milk group were intermediate and the chocolate milk with brushing group showed a marked reduction in dental caries. The results of two other groups were invalidated. In summary, for pit and fissure dental caries under the conditions tested in the mouth simulating device, chocolate milk exhibited a significant cariogenic potential relative to white milk, especially in the early incipient caries stage. It may be concluded from this study that in an individual with high dental caries susceptibility, it would seem unwise to recommend frequent ingestion of chocolate milk, unless proper and immediate oral hygiene follows the ingestion.
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    An evaluation of tetracycline stain removal by bleaching vital rabbit incisors
    (1974) Fleege, Patrick A.; Roche, James R., 1924-; Klein, Arthur Irving, 1922-2004; Katz, Simon, 1920-1987; Koerber, Leonard G.; Mitchell, David F.
    This study evaluated the effectiveness of bleaching tetracycline-stained teeth by measuring the loss of fluorescent intensity from teeth that were bleached. Nineteen male New Zealand white rabbits, with 58 incisors stained with oxytetracycline and 16 incisors as unstained controls, were used. Three rabbits were sacrificed to determine whether the tetracycline stain was comparable between incisors in the same jaw. Of the remaining 16 animals, 6 were bleached once and 10 were bleached twice. One maxillary and one mandibular incisor were bleached in each jaw with 30 percent hydrogen peroxide and heat for ten minutes per tooth; the other incisors were protected with a rubber dam. The animals were sacrificed 24 hours after the last bleach. The fluorescent intensity of 374 select ground sections 100 ± 5 microns thick from the incisal, middle and gingival thirds of the teeth were measured with an ultraviolet light microscope coupled to a television electronic measurement system. These measurements were statistically analyzed by t-test, and observations correlated. The dentin of tetracycline-stained maxillary incisors which were bleached twice and the dentin in the incisal one-third of the mandibular incisors which were bleached twice had a significantly (P ≤ 0.001, P ≤ 0.005) lower tetracycline fluorescent intensity than the dentin of unbleached tetracycline-stained teeth. The greatest loss of fluorescent intensity of tetracycline occurred in dentin closest to the dentino-enamel junction and varied from about 150 to 350 microns from the outer enamel surface. Clinical Kodachromes indicate that the loss of tetracycline pigment is associated with the loss of tetracycline fluorescence; The ground sections showed that the tetracycline fluorescence was never totally removed by two bleaches.
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    Vitamin - Fluoride supplements: effect on dental caries and fluorosis in sub-optimum fluoride areas
    (1975) Hennon, David Kent, 1933-; Roche, James R., 1924-; El-Kafrawy, Abdel Hady, 1935-; Bixler, David; Katz, Simon, 1920-1987; Standish, S. Miles, 1923-2003; Mitchell, David F.
    This study was designed to determine if additional fluoride, ingested as a sodium fluoride - vitamin supplement would provide added protection against dental caries without causing any significant fluorosis. A total of 456 children, one to 14 months of age, residing in cities having 0.6 - 0. 8 ppm F in the water supply were randomly assigned according to age, sex and community to the following groups : Group A, 0. 5 mg F to age 3 then 1. 0 mg thereafter; Group B (control), vitamins throughout the study; and Group C, 0.5 mg F throughout the study. Dental examinations were started at approximately 2 1/2 to 3 years of age and were repeated every six months. A fluorosis examination ended the study after about seven years. When compared according to length of time on product, Group A had a significant reduction in deft and defs of 42.2 and 47.1 percent at 60 months. Group C had a 32.1 and 37.4 percent reduction. When compared by age, Group A had a 37.5 and 44.8 percent reduction in deft and defs at 66 months. Group C had a 34.3 and 40.1 percent reduction for the same period. No significant reductions were observed in permanent teeth. Based on the fluorosis index (Group A - 0.250; Group B - 0.033; and Group C - 0.188) none of the groups had any unacceptable amounts of fluorosis. The results indicate that up to 1.0 mg per day of additional fluoride does not cause objectionable fluorosis and may be ingested safely by children residing in areas containing 0. 6 - 0. 8 ppm F in the water supply. A 0.5 mg F supplement was almost as effective as a 1.0 mg level in providing added protection against dental caries in primary teeth.