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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

Odontoblasts

Sensory cells


Receive and transfer stimuli to nerve endings in the pulp

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

Algesic

Pain giving chemical / Pain producing

Hypertonic saline


Potassium chloride


5-hydroxytryptamine


Acetylcholine


Bradykinin


Histamine


Substance P

Pain producing substances

Peptide bradykinin

very potent and elicits the kind of pain that mimicked the clinically experienced sensation

Chemoreceptors

Sensory nerve endings that mediate pain

Analgesic

Pain relieving chemical/drug

5-hydroxytryptamine


Histamine


Bradykinin

Vasoactive amines

Basophils


Mast cells


Platelets

Main source of the amines

Blood-clotting system

Acts as the activator

Kallikrein

A protease, that liberates kinins from their precursors

Prostaglandins

Form a complex group of fatty acids

To sensitize the nociceptors to the effects of bradykinin, thereby accentuating its action

The main contribution of prostaglandins

Aspirin


Indomethacin


Other minor analgesic agents

Block the cyclooxygenase reaction by inactivating the enzyme, thereby preventing the biosynthesis of prostaglandin

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

Naloxone

Electrically induced analgesia was reversible by the narcotic antagonist

Endorphins

Morphine-like chemicals


Morphin within


Distribution of opoid receptors

Abundance in the dorsal horn of the spinal cord


Medullary raphe nuclei


Periaqueductal gray matter

Opoid receptors located

Analgesia

May be produced by closing the gate to noxious stimuli at the first synaptic level

Pro-opiocortin

A large polypeptide, is released by the pituitary gland and is the precursor fot both adrenal corticotropic hormone (ACTH) and B-lipoprotein

B-lipoprotein

Serves as the precursor for most endorphins such as b-endorphin, met-enkephalin, leu-enkephalin

Analgesia


Euphoria


Catatonia


Hallucinations


Schizophrenia

Neurohormones produce a wide variety of effects

Pain perception

Physioanatomical process whereby an impulse is generated

Pain reaction

Psychophysiological process that represents the individuals overt manifestation of the unpleasant perceptual process that just occured

Hyporeactive

High pain threshold

Hyperreactive

Low pain threshold

Emotional States


Age


Fatigue


Racial and nationality characteristics


Sex


Fear and apprehension

Pain reaction

Fifth cranial nerve or trigeminal nerve

Is the principal sensory nerve of the head region

Ascending fiber

Conveys general tactile sensibility

Descending fiber

Conveys pain and temperature

Physiological continuity

Effected by synaptic transmission, which implies a relationship between two neurons without actual anatomical union

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.

Control or elimination of pain

One of the most important aspects of the prcactice of dentistry

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

Removing the cause

Desirable method of controlling pain

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

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

Aspirin

Effectively only in the relief of mild discomfort

Narcotics

Not pure analgesics are effective against more severe pain because they are able to raise the pain threshold to a greater degree

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

Using psychosomatic methods

Cheapest way to prevent pain


Important factor: honesty & sincerity toward the patient

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

Referred Pain

Pain experienced at a site some distance from the site of injury

Neurogenic pain

Sharp, burning and intense; may be constant or intermittent

Vascular pain

Diffuse; may be referred and thus difficult to localize

Muscle pain

Most likely dull; limited to the area of origin

Factors