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Deep Blue at the University of Michigan (72.870 recursos)

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Dentistry, School of

Mostrando recursos 121 - 140 de 324

  1. The Effect of Post Type and Length on the Fracture Resistance of Endodontically Treated Teeth

    McLaren, John Duncan

  2. Time-Dependent Fluoride Uptake into Dentin from a Resin-Modified Glass Ionomer

    McLaren, Charles I.

  3. Translucency & Radiopacity of Five Resin Composites

    Thompson, James M., Jr.

  4. Clinical and Molecular Analysis of Sealed Carious Dentin

    Lacin, Tijen

  5. Enamel Paste in the Treatment of Dentin Hypersensitivity

    Taha, Sahar Thaher

  6. Clinical and Histological Evaluation of Life®, Dycal® and Cavitec® in Conservative Pulpal Therapy

    Fitzgerald, Mark

  7. Effect of Coping Design on the Fracture Resistance of Pressable Zirconia Core Ceramics

    Krishnan, Gail Ann

  8. Composites: Better, Faster and Easier

    Hamilton, James C.
    Two hour continuing dental education lecture presented by James C. Hamilton, DDS at Loma Linda School of Dentistry with a live demonstration on a typodont of the Custom Matrix Technique for light cured dental restorative materials. This technique utilizes a clear poly vinyl siloxane bite registration material to take a small impression without a tray and uses that impression as a die to force the unset light cured dental restorative material into the original anatomy, surface texture and occlusion that the patient had when the procedure started. Then the restorative material is cured through the clear bite registration material creating...

  9. Macroporous and nanofibrous polymer scaffolds and polymer/bone-like apatite composite scaffolds generated by sugar spheres

    Wei, Guobao; Ma, Peter X.
    Scaffolds are crucial to tissue engineering/regeneration. In this work, a technique combining a unique phase-separation process with a novel sugar sphere template leaching process has been developed to produce three-dimensional scaffolds. The resulting scaffolds possess high porosities, well connected macropores, and nanofibrous pore walls. The technique advantageously controls macropore shape and size by sugar spheres, interpore opening size by assembly conditions (time and temperature of heat treatment), and pore wall morphology by phase-separation parameters. The bioactivity of a macroporous and nanofibrous poly( L -lactic acid) (PLLA) scaffold was demonstrated by the bone-like apatite deposition throughout the scaffold in a simulated...

  10. Temporal and spatial patterns of tenascin and laminin immunoreactivity suggest roles for extracellular matrix in development of gustatory papillae and taste buds

    Mistretta, Charlotte M.; Haus, Linda F.
    Gustatory papillae are complex organs that are composed of 1) an epithelium, 2) specialized sensory cells within the epithelium (the taste buds), 3) a broad connective core, and 4) sensory innervation. During papilla development, cells in the various tissue compartments must divide, aggregate, detach, migrate, and reaggregate in relation to each other, but factors that regulate such steps are poorly understood and have not been extensively studied. All of these processes potentially require participation of the extracellular matrix. Therefore, we have studied temporal and spatial patterns of immunoreactivity for two extracellular matrix molecules, tenascin and laminin, in the developing fungiform...

  11. Maturation of neuron types in nucleus of solitary tract associated with functional convergence during development of taste circuits

    Mistretta, Charlotte M.; Labyak, Susan E.
    Late fetal through postnatal development in sheep is a period of increasing convergence of afferent taste fibers onto second-order neurons in the nucleus of the solitary tract (NST). To learn whether neuron morphology alters in concert with convergence and neurophysiological development in NST, three-dimensional neuron reconstructions were made of cells in a functionally defined region of gustatory NST from Golgi preparations of the brainstem. Elongate, multipolar, and ovoid neurons were studied in fetuses from 85 days of gestation through the perinatal period (term = 147 days of gestation), to postnatal stages. Somal size and form, and dendritic complexity and extent,...

  12. Relationship between structure and function of neurons in the rat rostral nucleus tractus solitarii

    King, Michael S.; Bradley, Robert M.
    To investigate the relationship between the structure and function of neurons in the rostral (gustatory) nucleus tractus solitarii (rNTS), we analyzed the morphological and biophysical properties of rNTS neurons by performing whole-cell recordings in a brain slice preparation. Overall, neurons (n=58) had a mean somal diameter of 16 Μm, an average dendritic length of 598 Μm, an average dendritic thickness of 0.91 Μm, and a spine density of 0.037 spines/Μm. Neurons were separated into three groups (elongate, miltipolar, and ovoid) on the basis of previously established morphological criteria. The highest percentage (49%) of neurons were classified as ovoid, while 35%...

  13. Central connections of the lingual tonsillar branch of the glossopharyngeal nerve and the superior laryngeal nerve in lamb

    Sweazey, Robert D.; Bradley, Robert M.
    Afferent and efferent central connections of the lingual-tonsillar branch of the glossopharyngeal nerve (LT-IX) and the superior laryngeal nerve (SLN) in the lamb were traced with horseradish peroxidase (HRP) histochemistry. After entering the brainstem, most LT-IX and SLN afferent fibers turned caudally in the solitary tract (ST). Some afferent fibers of LT-IX terminated in the medial nucleus of the solitary tract slightly caudal to their level of entry. The remaining fibers projected to the dorsolateral, ventrolateral, and interstitial areas of the nucleus of the solitary tract (NST) at the level of the area postrema. Superior laryngeal nerve afferent fibers terminated...

  14. Neural basis of developing salt taste sensation: Response changes in fetal, postnatal, and adult sheep

    Mistretta, Charlotte M.; Bradley, Robert M.
    To learn whether salt taste responses change during mammalian development, we recorded from multifiber preparations of the chorda tympani while stimulating the anterior tongue in sheep fetuses, lambs, and adults. Stimuli were 0.5 M NH4C1, KC1, NaCl, and LiCl, and 0.05–0.75 M concentration series of the first three salts. Ultrastructural studies were made of taste buds at different ages to determine whether morphological elements such as microvilli and tight junctions are present in young fetuses. Substantial changes occur in relative salt taste responses, throughout development. In fetuses that are beginning the last third of gestation, NaCl and LiCl elicit much...

  15. Development of chorda tympani taste responses in rat

    Ferrell, M. F.; Mistretta, Charlotte M.; Bradley, Robert M.
    To learn whether neurophysiological taste responses change during structural development of the gustatory system, we recorded from the chorda tympani nerve in rats aged 7 to 92 days after birth. Chemical stimuli applied to the anterior tongue included four monochloride salts, two acids, sucrose, and urea. Responses to all chemicals were obtained as early as 7 days postnatally. Developmental changes in salt, acid, and sucrose responses were observed. Relative to NaCl and LiCl, NH 4 Cl and KCl gradually decrease in effectiveness as taste stimuli; or, relative to NH 4 Cl and KCl, NaCl and LiCl become more effective stimuli....

  16. Denervation-induced changes in cell proliferation in the rat molar after wounding

    Chiego, Daniel J.; Klein, Robert M.; Avery, James K.; Gruhl, Iris M.
    The dental pulp has the capacity to initiate and maintain repair after trauma. The purpose of the present study was to quantitatively analyze the role of the peripheral nervous system in regulation of pulpal cell proliferation in response to wounding. Six groups often rats were used in these studies. There was one baseline group (wounded, but innervation intact) and five resection groups. The resection groups included rats with unilateral superior cervical ganglionectomy (SCG), unilateral inferior alveolar nerve resection (IAN), unilateral chorda tympani (CT) resection, IAN + SCG, or a complete unilateral nerve resection (IAN + SCG + CT). One millimeter...

  17. Age does not affect numbers of taste buds and papillae in adult rhesus monkeys

    Bradley, Robert M.; Stedman, Hazel M.; Mistretta, Charlotte M.
    Taste buds and papillae in tongues of rhesus monkeys were examined and counted to determine if there are age-related differences in general morphology or numbers of receptor organs. Tongues from 15 monkeys in five groups aged 4–31 years were studied with light microscopy. Fungiform, circumvallate, and foliate papillae were examined and taste buds in each papilla type were counted. Numbers of papillae did not differ with age through 31 years; however, at 24 years and older, fungiform papillae were reduced in number in some animals that had lost tongue tips due to trauma. There were no age-related differences in numbers...

  18. Adaptation of the masseter and temporalis muscles following alteration in length, with or without surgical detachment

    Maxwell, Leo C.; Carlson, David S.; McNamara, James A. Jr.; Faulkner, John A.
    Histochemical properties, muscle fiber cross-sectional area, muscle fiber length, and the oxidative capacity of masticatory muscles of female rhesus monkeys were assessed following alteration in functional length by an intraoral appliance or by detachment of the muscle. Experimental groups received the appliance only (A); the appliance and subsequent detachment of the masseter (AD); the appliance and detached masseter, but with surgical reattachment of the masseter to the pterygomasseteric sling (ADR); no appliance, but detachment and reattachment of masseter (DR); or an appliance which was removed after 24 weeks to study posttreatment responses (PT). Animals were sacrificed and the muscles were...

  19. Histological analysis of the growth of the mandibular condyle in the rhesus monkey ( Macaca mulatta ) This research was supported by the National Institute of Dental Research, NIH Research Grant DE 03610 and Post-Doctoral Research Fellowship DE 05101.

    Carlson, David S.; McNamara, James A. Jr.; Jaul, Douglas H.
    Qualitative and quantitative data on the growth of the mandibular condyle in the rhesus monkey ( Macaca mulatta ) are limited. The purpose of this investigation was to provide such data, with emphasis on variation in the size of the cartilaginous layers in the condyle and on condylar growth at five maturational levels (i.e., neonate, infant, juvenile, adolescent and young adult). Two regions of the mandibular condyle, the articular tissue and the prechondroblastic-chondroblastic (growth) layer, were examined histologically in 38 rhesus monkeys. The absolute area of the articular layer increased dramatically from the neonatal through the juvenile age groups and...

  20. The independent functions of the two heads of the lateral pterygoid muscle This research was supported in part by United States Public Health Service grants HD-02272 and DE-03610

    McNamara, James A. Jr.
    Investigations on the role of the lateral pterygoid muscle in mandibular movements have been limited due to difficulties in obtaining consistent neuromuscular recordings in human subjects. The rhesus monkey was used as a substitute experimental animal. Thirty-three Macaca mulatta were monitored in 113 electromyographic recording sessions. Two distinct functional patterns were identified from the region of the lateral pterygoid muscle, depending upon the location of the electrodes within this muscle. Through anatomical dissection of areas of electrode placement in 12 animals, the two patterns of activity were related to the inferior and superior heads of the lateral pterygoid muscle. The...

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