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Biomedical subjects

C J Patterson

Publications and source records attributed to C J Patterson.

At least 55 records · Page 3Linked to original sources
PubMed1988

In vitro temperature rises during visible-light curing of a lining material and a posterior composite.

The aim of this study was to measure the rise in temperature during: (i) a single cycle of a curing light unit, (ii) the polymerization of a layer of light-cured lining material, and (iii) the polymerization of a light-cured posterior composite material, and also during combinations of these individual procedures. Experimental work was undertaken in vitro and measurements were made using a thermocouple placed centrally in an insulated PTFE well. Large temperature rises occurred with the use of the curing light alone. The lining material itself did not contribute significantly to the rise in temperature during curing, nor did it provide thermal insulation from the output temperature emitted by the light guide. The presence of a layer of posterior composite reduced the temperature transmitted from the light but the residual temperature rise transmitted was still of such a magnitude as to cause concern regarding possible thermal injury to the pulp.

Calcium Hydroxide↗
PubMed1987

Early management and histology of a severely malformed upper incisor.

A case is presented wherein a severely malformed permanent central incisor was reshaped utilizing a visible light cured composite resin restorative material and retained for two years pending the commencement of active orthodontic therapy. The orthodontic implications of this case are discussed as are the histological and restorative dentistry aspects. The need for a combined, interdisciplinary approach to such problems is emphasized.

Child↗
PubMed1986

Are geriatric units needed for elderly patients with hip fractures?

To assess the need for a multidisciplinary geriatric unit in the treatment of elderly patients with hip fractures, we reviewed the charts of all patients aged 60 years or older who were treated for hip fractures in five hospitals in Hamilton, Ont., between August 1982 and September 1983. We hypothesized that discharge to a different location from that before admission would indicate reduced functional status and classified the reasons for a change in residence as poor patient motivation, need for rehabilitation, compromised ambulation, postoperative complications and inevitable deterioration. We believed that geriatric care would be most beneficial to those in the first three groups. Of the 327 patients with hip fractures 40 (12%) died before discharge. Of the 287 surviving patients 149 (52%) had been discharged by 4 weeks, and only 29 (10%) remained in hospital by 12 weeks. Of the 287, 44 (15%) were discharged to a different location from that before admission: in 75% the cause appeared to be inevitable deterioration (57%) or postoperative complications (18%). The remaining 25% needed rehabilitation and were all sent to appropriate facilities. None of the patients with ambulation problems or poor motivation required an increased level of care. We could not show a need for geriatric care in our population; possible explanations are discussed.

Aged↗
PubMed1980

Children's conceptions of the causes of illness: understanding of contagion and use of immanent justice.

15 healthy children at each of 4 grade levels (preschool, kindergarten, second grade, and fourth grade) were interviewed to assess their understanding of contagion and their use of immanent justice explanations for illness and accident. Compared to older children, younger ones were more likely to overextend the concept of contagion to inappropriate ailments (i.e., to noncontagious illness and to accident), and were less likely to understand the effect of distance between people on the likelihood of transmitting contagious ailments. Younger children were far more likely than older ones to invoke immanent justice explanations for events. Children at all ages employed immanent justice explanations with greater frequency for illness than for accident or misfortune. Finally, use of immanent justice was inversely related to understanding of the rational causes of illness. Even after the effects of age had been partialed out, children's use of immanent justice explanations for contagious illness was negatively correlated with their understanding of contagion.

Accidents↗
PubMed1970

Number coding in association cortex of the cat.

In electrophysiological investigations of single neurons in cortical association response areas of the cat, cells have been encountered that appear to code the property of number. In a sequence of stimulus presentations, these cells characteristically discharge to a particular numbered stimulus in the series. This effect is independent of stimulus modality, intensity, and interstimulus interval; thus, the cells seem to be responding to the number of stimulus presentations.

Animals↗
PubMedDate not supplied

Developmental pathways from child maltreatment to peer rejection.

Using a prospective longitudinal design, rejection by peers, aggressive behavior, and social withdrawal were examined among a representative community sample of 107 maltreated children and an equal number of non-maltreated children. Results revealed that chronic maltreatment was associated with heightened risk of rejection by peers. Chronically maltreated children were more likely to be rejected by peers repeatedly across multiple years from childhood to early adolescence. Maltreatment chronicity was also associated with higher levels of children's aggressive behavior, as reported by peers, teachers, and children themselves. Aggressive behavior accounted in large part for the association between chronic maltreatment and rejection by peers. Socially withdrawn behavior was associated with peer rejection, but did not account for the association between chronic maltreatment and peer rejection. These results held for both girls and boys, followed from childhood through early adolescence. Moreover, the links among chronic maltreatment, aggressive behavior, and peer rejection were already established by early school age. Implications of these results for developmental theory and intervention are discussed.

Adolescent↗