PubMed Health⌕ Search

Biomedical subjects

N C Murphy

Publications and source records attributed to N C Murphy.

14 recordsLinked to original sources
PubMed1982

Experimental force analysis of the contraction utility arch wire.

An experimental apparatus consisting of a metal framework, a strain gauge, and a Wheatstone bridge was used to measure the retraction force delivered to the mandibular incisors by a contraction utility arch wire (0.016 by 0.016 inch blue Elgiloy). The contraction utility arch wire was activated 1 mm. and retraction forces were recorded as the deflection of a point image on an oscilloscope. The results indicated that the retraction forces at the incisor positions were reasonably within an optimal force range to move teeth quickly with minimal tissue damage and discomfort. However, the lateral incisor positions in both ovoid and narrow arch forms received significantly more force than the central incisor positions, and the narrow tapered arch form delivered more retraction force than the ovoid arch form.

Dental Stress Analysis↗
PubMed1981

Validation through self and other ratings on dimensions of six nonstressful multi-scaled personality instruments.

Six nonstressful personality instruments were concurrently validated using respondent and close friend ratings on specific scale dimensions. Tests were administered to 203 predominantly Caucasian college students. Prior to testing, the individual and a close friend through self-ratings and ratings of the respondents had estimated the strengths of the tested personality Variables on a seven-point scale. The definitions of the various personality dimensions were taken from publisher's manuals. An estimated whole test validity was obtained by an average of the individual scale validities using a conversion of Pearson's r to z'. Significant differences among and between subtest validities were found by ANOVA. All "self-rating" validities were significant (.001), with two of these self-rating validities significantly different (.01) than the other four tests. Only two "other-rating" validities were significant. All six tests appeared to be valid for college population use From preliminary analysis, counselees could rate themselves accurately on most test measures. In some cases self-ratings might be used in lieu of giving the test.

Journal Article↗
PubMed1979

Iron deficiency: an overlooked predisposing factor in angular cheilitis.

Clinicians who recommend the use of antifungal agents for angular cheilitis may be treating the symptoms and not the predisposing cause of the disease. Iron deficiency should be considered as part of the differential diagnosis whenever angular cheilitis is encountered, especially in women of child-bearing age.

Adult↗