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Basics of pain research Abhishek Kumar and Lilja K. Dagsdóttir (PhD Scholars) Section of Clinical Oral Physiology Department of Dentistry, Aarhus University, Vennelyst Boulevard 9 Aarhus, Denmark
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What is pain? Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described in terms of such damage * Warning signal of tissue damage Classified broadly into acute and chronic pain * International Association for the Study of Pain
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Basic mechanisum of pain Nociceptors : Specialised sensory receptors to detect noxious stimuli. Spinal chord Primary afferent fibres: carry noxious sensory information Ascending pathway: carry nociceptive signals to higher centers in the brain Brain: primary and secondary somatosensory cortex
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The experience of pain is complex and subjective, and is affected by factors such as cognition (e.g., distraction or catastrophizing), mood, beliefs and genetics Perception of pain
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Sensory organ for receiving inputs The brain assimilates and organizes the sensory inputs Multisensory inputs
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↘ ↘ ↘ ↘ Case report
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Pain in Laboratory
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Experiment Demonstrate how pain or perception of pain would affect function Overall Assumption Craniofacial pain (CFP) and its effects on biting is a model for understanding acute/chronic pain in general Pain will (may be) decrease the motor functions
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Objective To study the effect of pain in the masseter muscle and Temporomandibular Joint (TMJ) on biting ability / bite force Sixteen healthy volunteers Two sessions separated by 3-4 days Experimental pain
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Methods Biteforce
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Results
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Pain perception
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Conclusion Pain did not affect bite force Individual’s reaction to pain would be dependent on the ability of the individual to cope with the painful stimulus, Not pain in itself but rather how pain is perceived
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Section of clinical oral physiology
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FORSØG: SMERTENS INDFLYDELSE PÅ DET SENSORISKE SYSTEM 12 FRISKE DELTAGERE DET KOMMER TIL AT GØRE LIDT ONT, men KUN I KORT TID. HUSK: LUKKEDE ØJNE OG KONCENTRERE JER OM OPGAVEN 1. TAKTILE STIMULI/ TANDSTIKKER FØR (LUKKEDE ØJNE) 1 prik på læben HVOR MEGET KAN DU MÆRKE? O = KAN IKKE MÆRKE PRIKKET, 50 SMERTE STARTER og 100 VÆRST TÆNKLIG SMERTE. Alle tal på skalaen fra 0-100 må bruges. 2. SMØR forsigtigt en lille dråbe, svarende til vatpinden på læben. DELTAGERE: I MÅ IKKE SLIKKE DET AF! ;o) 3. PÅ SKALAEN 0-10 HVOR ONT GØR DET? 0 = INGEN SMERTE, 10 = VÆRST TÆNKELIG SMERTE HVILKET ORD HVIS NOGET BESKRIVER BEDST SMERTEN? ANDET SÅ SKRIV DET GERNE PÅ SEDDLEN 4. TAKTILE STIMULI/ TANDSTIKKER EFTER (LUKKEDE ØJNE) 1 prik på læben HVOR MEGET KAN DU MÆRKE? O = KAN IKKE MÆRKE PRIKKET, 50 SMERTE STARTER og 100 VÆRST TÆNKLIG SMERTE. Alle tal på skalaen fra 0-100 må bruges. 0……………..……50……...…..………100
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