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  • 1
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Tooth eruption is a localized, bilaterally symmetrical series of events which involves resorption and formation of alveolar bone on opposite sides of the tooth and requires the presence of the dental follicle. We examined the effect on eruption of selective surgical removal of parts of the follicle. Removal of either the basal or coronal halves of the follicle prevented eruption. Bone resorption and formation of an eruption pathway did not occur after removal of the coronal part of the follicle and bone formation did not occur after removal of the basal part of the follicle. Exposure and incisions of the follicle had no effect on eruption. We interpret these data to mean that the polarized resorption and formation of alveolar bone that occur around a tooth during eruption are regulated by the adjacent parts of the dental follicle.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The dental follicle is a loose connective tissue layer that surrounds the developing and erupting tooth. The follicle is necessary for tooth eruption in dogs and specific cellular changes occur in the follicle at the onset of tooth eruption, in particular, within the coronal region of the follicle next to areas of subsequent bone resorption there is an increase in mononuclear cells which have the ultrastructure features of monocytes and contain specific granules characteristic of preosteoclasts. The follicle has an extensive microvasculature and monocytes are often seen adjacent to capillaries and venules. Monocytes increase in number in direct proportion to the increase in osteoclasts that form the eruption pathway and decrease in number as soon as this activity is completed. It is postulated that monocytes enter the follicle from the microvasculature and then migrate to the walls of the bony crypt to participate in the formation of the eruption pathway.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 98 (1991), S. 0 
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objective To determine the relative value of the woman's age, basal follicle stimulating hormone (FSH), basal luteinising hormone (LH) and menstrual cycle pattern (all denned prior to treatment) in predicting the ovarian response to gonadotrophin stimulation for in vitro fertilisation.Design Open, descriptive cohort study.Patients One hundred and seventy-one consecutive ovulatory women undergoing their first cycle of in vitro fertilisation with ovarian stimulation after pituitary desensitisation.Interventions Measurement of basal (early follicular phase) and down-regulated concentrations of serum FSH and LH, and calculation of age at treatment and of median length of menstrual cycles and range of variation prior to treatment.Main outcome measures Duration and amount of gonadotrophin stimulation to achieve follicular maturity, number of mature follicles, peak serum oestradiol concentration and number of mature oocytes, were compared between banded values of variables studied.Results Increasing basal FSH concentrations were significantly associated with reducing oestradiol levels, numbers of mature follicles and oocyte yield even when the FSH levels were still within the normal range though above average (6 to 8.9 i.u./l). There were similar but weaker associations with FSH levels after down-regulation. There were also significant differences between women over and under 40 years old in their oestradiol levels, numbers of follicles and of oocytes. Analysis of variance showed significant independent association of basal FSH with both oestradiol and numbers of oocytes, but not of age, menstrual pattern, or serum LH concentrations.Conclusion Serum FSH is more sensitive than the woman's age in determining her ovarian responsiveness to stimulation. LH concentrations and menstrual cycle patterns are unhelpful.
    Type of Medium: Electronic Resource
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