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48 Cards in this Set
- Front
- Back
Biochemical mediators of pain |
The beginning and the agreement regarding specific functions is lacking |
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Odontoblasts |
Sensory cells Receive and transfer stimuli to nerve endings in the pulp |
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Hydrodynamic Theory |
it is necessary to show all stimuli that cause pain, the only sense experienced by the dental pulp, also cause fluid to flow in the dentinal tubules |
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Algesic |
Pain giving chemical / Pain producing |
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Hypertonic saline Potassium chloride 5-hydroxytryptamine Acetylcholine Bradykinin Histamine Substance P |
Pain producing substances |
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Peptide bradykinin |
very potent and elicits the kind of pain that mimicked the clinically experienced sensation |
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Chemoreceptors |
Sensory nerve endings that mediate pain |
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Analgesic |
Pain relieving chemical/drug |
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5-hydroxytryptamine Histamine Bradykinin |
Vasoactive amines |
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Basophils Mast cells Platelets |
Main source of the amines |
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Blood-clotting system |
Acts as the activator |
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Kallikrein |
A protease, that liberates kinins from their precursors |
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Prostaglandins |
Form a complex group of fatty acids |
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To sensitize the nociceptors to the effects of bradykinin, thereby accentuating its action |
The main contribution of prostaglandins |
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Aspirin Indomethacin Other minor analgesic agents |
Block the cyclooxygenase reaction by inactivating the enzyme, thereby preventing the biosynthesis of prostaglandin |
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Substance P |
An excitatory transmitter within the nociceptive system at the first afferent synaptic level. May act as a modulator of neural excitability rather than as a neurotransmitter |
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Naloxone |
Electrically induced analgesia was reversible by the narcotic antagonist |
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Endorphins |
Morphine-like chemicals Morphin within Distribution of opoid receptors |
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Abundance in the dorsal horn of the spinal cord Medullary raphe nuclei Periaqueductal gray matter |
Opoid receptors located |
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Analgesia |
May be produced by closing the gate to noxious stimuli at the first synaptic level |
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Pro-opiocortin |
A large polypeptide, is released by the pituitary gland and is the precursor fot both adrenal corticotropic hormone (ACTH) and B-lipoprotein |
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B-lipoprotein |
Serves as the precursor for most endorphins such as b-endorphin, met-enkephalin, leu-enkephalin |
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Analgesia Euphoria Catatonia Hallucinations Schizophrenia |
Neurohormones produce a wide variety of effects |
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Pain perception |
Physioanatomical process whereby an impulse is generated |
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Pain reaction |
Psychophysiological process that represents the individuals overt manifestation of the unpleasant perceptual process that just occured |
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Hyporeactive |
High pain threshold |
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Hyperreactive |
Low pain threshold |
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Emotional States Age Fatigue Racial and nationality characteristics Sex Fear and apprehension |
Pain reaction |
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Fifth cranial nerve or trigeminal nerve |
Is the principal sensory nerve of the head region |
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Ascending fiber |
Conveys general tactile sensibility |
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Descending fiber |
Conveys pain and temperature |
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Physiological continuity |
Effected by synaptic transmission, which implies a relationship between two neurons without actual anatomical union |
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Pain |
an unpleasant emotional experience usually initiated by a noxious stimulus and transmitted over a specialized neural network to the central nervous system where it is interpreted as such. |
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Control or elimination of pain |
One of the most important aspects of the prcactice of dentistry |
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Removing the cause Blocking the pathway in painful impulses Raising the pain threshold Preventing pain reaction by cortical depression Using psychosomtic methods |
Methods of Pain Control |
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Removing the cause |
Desirable method of controlling pain |
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Blocking the pathway of painful impulses |
The most widely used method in dentistry for controlling pain The local anestethic solution prevents depolarization of the nerve fibers Pain perception |
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Raising the pain threshold |
Depends on the pharmacological action of drugs possessing analgesic properties. These drugs raise the pain threshold centrally and therefore interfere with pain reaction |
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Aspirin |
Effectively only in the relief of mild discomfort |
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Narcotics |
Not pure analgesics are effective against more severe pain because they are able to raise the pain threshold to a greater degree |
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Preventing pain reaction by cortical depression |
Within the scope of general anesthesia and the general anesthetic agents Cerebral cortex is depressend only to the point that the inhinitions are suppressed, the patient may become hyperreactive to a painful stimulus |
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Using psychosomatic methods |
Cheapest way to prevent pain Important factor: honesty & sincerity toward the patient |
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Psychogenic pain |
Unpleasant sensation that has no organic basis. It is any pain that originates wholly whitin the mind and is fixed on some portion of the anatomy |
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Referred Pain |
Pain experienced at a site some distance from the site of injury |
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Neurogenic pain |
Sharp, burning and intense; may be constant or intermittent |
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Vascular pain |
Diffuse; may be referred and thus difficult to localize |
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Muscle pain |
Most likely dull; limited to the area of origin |
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Factors |
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