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Liya dentinehypersensitivity


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Liya dentinehypersensitivity

  1. 1. Dr. Liya Alice Thomas First year MDS
  3. 3. INTRODUCTION • Common global oral health problem • Most frequently encountered clinical problem • One of the oldest recorded complaints of discomfort • Response to a stimuli varies from person to person
  4. 4. DEFINITION • “Dentine hypersensitivity is characterized by short, sharp pain arising from exposed dentin in response to stimuli typically thermal, evaporative, tactile, osmotic or chemical and which cannot be ascribed to any other form of dental defect or pathology”. [HOLLAND ET AL,1997]
  6. 6. HISTORIC REVIEW YEAR PERSON DISCOVERY 1855 JD WHITE Dentinal pain was caused by movement of fluid in dentinal tubules 1941 LUKOMSKY Advocated sodium fluoride as desensitising agent 1963 BRANNSTROM Hydrodynamic theory of dentinal pain 1986 KLEINBERG Summarised different approaches that are used to treat hypersensitivity 1915 ALFRED GYSI Fluid in the tubule is incompressible
  7. 7. INCIDENCE AND PREVALENCE • AGE: all age groups peak incidence : 30-39 yrs old age : sensitivity because of- 1)secondary & tertiary dentin 2)pulp fibrosis 3)sclerosis of tubules
  8. 8. • SEX : women more frequently affected (15%) • INTRAORAL DISTRIBUTION: buccal cervical zones of permanent teeth
  10. 10. GINGIVAL RECESSION PRE-DISPOSING FACTORS :- 1)Alveolar bone 2)Tooth anatomy & tooth position 3)Oral hygiene 4)Gingival diseases 5)Trauma 6)Other factors
  11. 11. (1)ANATOMY OF ALVEOLAR BONE : • Most frequently cited predisposing factor • Thin, fenestrated or absent LABIAL BONE(Aldritt 1968,Bernimoulan and Curilovie 1977,Lost 1984)
  12. 12. (2)TOOTH ANATOMY & POSITION : • Tooth anatomy (Olsson and Lindhe 1991) & tooth position (Gorman 1967,Modheer and Odenrick 1980) can influence alveolar bone thickness • Orthodontic tooth movement
  13. 13. (3) ORAL HYGIENE :
  14. 14. (4) GINGIVAL DISEASES : • ANUG • ANUP • Chronic periodontitis with associated bone loss can cause recession although the BUCCAL area does not appear to be a site of predilection for periodontal lesions
  15. 15. (5) TRAUMA : • Non-surgical(scaling & root planing) • Impaction of foreign objects in the gingiva(Jenkins and Allen 1994) • Factitious injury(Glenwright and Stranhan 1994) • Toothbrushing (Sandholm et al 1982 , Bergstrom and Eliasson 1988 , Knocht et al 1993)
  16. 16. (6) OTHER FACTORS : • Frenal pull at the gingival margin (Mazdyasma and stoner 1980,Powell and McEniery 1981) • Occlusal trauma (Parfitt and Mjor 1964, Trott and Love 1966) • Emotional stress (Stone 1948)
  17. 17. NEUROPHYSIOLOGY OF TEETH • Teeth are supplied by the alveolar branches of the fifth cranial nerve, namely the trigeminal nerve (the maxillary branch in the upper jaw and the mandibular in the lower jaw). • Pulp is a highly innervated tissue that contains sensory trigeminal afferent axons. • Sympathetic efferent fibers control the blood flow
  18. 18. • The cell bodies of the sensory neurons of the pulp are located in the trigeminal ganglion. Hundreds, perhaps thousands, of axons enter the pulp through the apical foramen where they branch following the distribution of the blood supply all over the pulp. • The majority of the nerve bundles reach the coronal dentin where they fan out to form the nerve plexus of Raschkow. • These then synapse into the odontoblastic cell layer
  19. 19. • Two types of sensory nerve fibres are seen : Myelinated fibres (A delta{90%} & A beta) Unmyelinated fibres A delta fibres – pulp dentin borderin the coronal portion of the pulp & pulp horns C fibres – core of the pulp
  21. 21. A number of theories have been proposed over the years to explain the pain mechanism of dentinal hypersensitivity - : Direct Neural Stimulation Odontoblast Deformation Theory/Tranducer theory Hydrodynamic theory
  22. 22. (1)DIRECT NEURAL STIMULATION • One of the first theories put forth
  23. 23. Drawbacks : • Nerves are present only in the predentine & inner dentinal zones but donot extend upto the DEJ which is the most sensitive part of the dentine • Nerves absent in root dentin
  24. 24. (2)Odontoblast Deformation Theory/Tranducer theory • Rapp et al
  25. 25. Drawbacks : • Odontoblastic processes extend only partly through the dentin and not upto the DEJ • No demonstrable neurotransmitters like acetylcholine in the neural transmission of the pulp
  26. 26. (3) Hydrodynamic theory • Brannstrom • Dentin has over 300,000 tubules/mm2 which is filled with dentinal fluid. • In a vital tooth there is constant slow outward movement of the fluid through the tubules.
  27. 27. • WIDTH of the tubule is important as the rate of fluid flow is dependent on the fourth power of the radius. • If tubule diameter doubles a 16 fold increase in fluid flow occurs • Sensitive teeth have many more(8 times) & wider(2 times)tubules at the buccal cervical area compared to non-sensitive teeth.
  28. 28. • Higher velocity of fluid flow also occurs in tubules with smaller dimeter • Dentin will only be sensitive if the tubules are patent from pulp to the oral environment & this patency will change with production and removal of the smear layer hence resulting in an episodic condition.
  29. 29. CLINICAL FEATURES –Patients generally complain that pain arising from dentine hypersensitivity is usually rapid in onset, sharp in character, and short in duration. –Pain is considered to be an exaggerated response of normal pulp- dentin complex and is only felt on application of external stimulus. –No lingering discomfort once the stimulus is removed .
  30. 30. DIAGNOSIS (A) CASE HISTORY : • History & nature of pain • Number & location of the sensitive teeth • Intensity of the pain • Stimuli which initiates the pain • Frequency & duration of sensitivity • Treatment history
  31. 31. (B) CLINICAL EXAMINATION : • SUbjECTIvE EvALUATION 1. Verbal rating scales 2. Visual analogue scales 3. Verbal descriptor checklists 4. McGill word descriptors • ObjECTIvE ASSESSmENT 1. Mechanical stimuli 2. Chemical stimulation 3. Electrical stimulation 4. Dehydrating stimulation 5. Thermal stimulation 6. Hydrostatic pressure
  32. 32. SUbjECTIvE EvALUATION (1)VERBAL RATING SCALES : • Keele 1948 • Four point scale grading pain as SLIGHT , MODERATE , SEVERE & AGONIZING • Restrictive choice of words that may not be very precise with all patients.
  33. 33. (2)VISUAL ANALOGUE SCALES : • 10cm line.extremes of the line represent limits of pain • More sensitive in discriminating betwen various treatments and changes in pain intensity • Best available method
  34. 34. (3)VERBAL DESCRIPTOR CHECKLISTS : • Allows quantitative assessment of both the sensory and affective dimensions of pain using a continuum across different pain conditions instead of words intended to distinguish conditions (Gracely et al 1978)
  35. 35. (4)McGILL WORD DESCRIPTORS : • It is used to determine the nature of the discomfort & to monitor response to treatment. DISADV:reliance on the ability of the subject to understand the words presented to them
  37. 37. (2) CHEMICAL(OSMOTIC) STIMULATION : • Hypertonic solution of sucrose or calcium chloride (Anderson & Matthews 1967,Clark et al 1987) • Solute in solution diffuses into the dentinal fluid so on repeated application the osmotic pressure difference between the tubular fluid & applied fluid will decrease & reduce the effect of the solution as an osmotic stimulus(Pashley 1986) • Long time intervals should be allowed
  39. 39. (4)DEHYDRATING/EVAP ORATIVE STIMULI : • Combined thermal & evaporative stimulus • Short air blasts have been recommended to avoid excess evaporation & consequent changes in hypersensitivity (Brannstrom 1963,Pashley et al 1984) & undesirable pulpal effects • Affects wider area-more intense pain response
  40. 40. (5)ELECTRICAL STIMULATION : • Quantification of electric current can be used to measure sensitivity • Determine a condition called PRE-PAIN • Attributed to larger,more rapidly conducting nerve fibres • Current applied should be less than 1 milliampere
  41. 41. DIFFERENTIAL DIAGNOSIS • Cracked tooth syndrome(in heavily restored teeth) • Incorrect placement of dentin adhesives (nanoleakage) • Fractured restorations • Pulpal response to caries & restorative treatment • Improperly contoured restorations (traumatic occlusion) • Chipped teeth • Vital bleaching
  42. 42. PREVENTION (1) DIETARY COUNSELLING : • Reduce dietary acids
  44. 44. (3) PLAQUE CONTROL :
  45. 45. (4)REDUCE OR ELIMINATE PARAFUNCTIONAL HABITS• Professionally fabricated occlusal night guards • Re-positioning splints • Stress management
  46. 46. TREATMENT
  47. 47. DESENSITIZATION BY OCCLUDING DENTINAL TUBULES A)Formation of smear layer B)Topical agents C)Restorations 1.calcium hydroxide paste D)Lasers 2.calcium phosphate paste 3.silver nitrate 4.strontium chloride 5.fluorides 6.potassium oxalates 7.varnishes 8.dentin adhesives
  48. 48. A) Formation of smear layer : • Isolating the affected tooth & burnishing the dentin with an orangewood stick. • Results in the formation of a smear layer which occludes the tubules • Temporary relief
  49. 49. B) Topical Agents : i)CALCIUM HYDROXIDE – Mixed with distilled water to form a thick paste Applied for a few minutes on exposed dentin Increases remineralization Temporary relief
  50. 50. ii)CALCIUM PHOSPHATE PASTES – Amorphous calcium phosphate (ACP) Blocks tubules & reduces permeability by 85% Can also be used to remineralize incipient enamel caries Commercially available product:GC Tooth Mousse contains ACP & caesin phosphopeptide
  51. 51. iii)SILVER NITRATE – It reduces fluid movement by precipitating protein or silver chloride within the dentinal tubules. But it stains dentin and is also damaging to the pulp and gingiva. Not used anymore
  52. 52. iv)STRONTIUM CHLORIDE – SrCl2 was the first tubule blocking agent to be introduced into toothpastes 3 MOA : a)nerve depolarization b)because it is chemically similar to calcium it can replace lost calcium in hydroxyapatite lattice c)deposit a layer of fine particles which can occlude the tubules Commercially available – Sensodyne Tooth wear & sensitivity – Martin Addy, Graham Embery, W Miachael Edgar & Robin Orchardson - 1st edition
  53. 53. V)FLUORIDES – Agents like sodium fluoride , stannous fluoride or acidulated phosphate fluoride may be used for few minutes as mouthrinse, toothpaste or as topical application over exposed dentin. Act by forming fluoroapatite within tubules which blocks fluid movement within dentin.
  54. 54. STANNOUS FLUORIDE Research has shown Stannous fluoride to be effective against dentinal hypersensitivity – 2 to 4 weeks – 0.4% gel MOA– tin rich surface deposit (in vitro) – nearly complete surface coverage and occlusion of tubules Topical stannous fluoride – reduces sensitivity on exposed cervical root surfaces Patricia A. Walters - J Contemp Dent Prac, May 15, 2005, Vol 6, No 2, 107-117
  55. 55. Limitation – potential for temporary extrinsic tooth staining associated with long-term use Open tubules following treatment After use of SnF2 dentrifice with non-sensitivity fluoride toothpaste
  56. 56. SODIUM FLUORIDE Increase in resistance of dentin to acid decalcification as well as precipitations in exposed dentinal tubules MOA– precipitated fluoride compounds mechanically blocking exposed dentinal tubules or fluoride within tubules blocking transmission of stimuli
  57. 57. vi)IONOTOPHORESIS - Electrical potential is used to transfer the ions into the body for therapeutic purposes METHOD :- Place a negative electrode on the dentin & positive electrode on the patient’s face/arm Isolate teeth with plastic strips or cotton rolls Chemical is applied to tooth surface & current is passed through –ive electrode using 0.5mA current.
  58. 58. Commonly used solutions – a)30% potassium oxalate b)6% ferric oxalate ADV:long term relief DISADV:1) uses expensive equipment 2)requires more than one application
  59. 59. vii)POTASSIUM OXALATE – Oxalate ions + calcium ions = calcium oxalate crystals Very effective method
  60. 60. viii)VARNISHES – Forms a barrier over exposed dentin & reduces the permeability Temporary relief Eg:duraflor,duraphat
  61. 61. ix)DENTIN ADHESIVES- Dentin bonding agents are used Micromechanical bonding through formation of an interdiffusion hybrid layer Eg:Gluma desensitizer(Heraeus Kulzer) Amalgambond(Parkell) Single Bond(3M)
  62. 62. GLUMA DESENSITIZER • 5% gluteraldehyde and 35%HEMA in water • Control DH & decrease post operative sensitvity in restorative procedures • No mixing & no curing.No repetitive steps. • No drip formula, so it stays where you place it,minimising contact with soft tissues.
  63. 63. INDICATIONS : • Cervical erosions • Exposed dentin surface • Gingival recession • Under crowns • Bridges • Inlays & onlays • Veneer & temporaries • Margins around temporary crowns • Under all direct restorations.
  64. 64. C)Restorations : • Glass Ionomer Cement or a Composite Resin Restoration is used • Long lasting relief
  65. 65. D) Lasers : a.CO2 laser b.Nd:YAG laser c. Er:YAG laser d.He:Ne Laser • MOA- Coagulation & precipitaion of plasma proteins in the dentinal fluid without altering the surface of dentin. • A meta-analysis study done by Sgolastra F et al in 2013 proved the efficacy of Nd:YAG over Er:YAG in the treatment of dentinal hypersensitivity.
  66. 66.  ADVANTAGES : i. analgesic iii.anti-inflammatory effects iv.painless, safe, fast, conservative treatment, and it is well accepted by the patients
  67. 67.  DISADVANTAGES i. High cost ii. Professional expertise iii. Thermal side effects Lasers as a treatment modality for dentinal hypersensitivity-Teresa Mao, Dr. Julie Toby IOSR Journal of Dental and Medical Sciences (IOSR-JDMS) e-ISSN: 2279-0853, p-ISSN: 2279-0861. Volume9, Issue2 (Jul.- Aug. 2013), PP 29-32
  68. 68. DESENSITIZATION BY BLOCKING PULPAL SENSORY NERVES POTASSIUM SALTS : • Excitability of intradental nerves • MOA : raise concentration of potassium ions in the extracellular fluid Depolarization of nerve cells Brief excitatory burst
  69. 69. • DISADV : works slowly over a period of time HOW TO USE??? Brushing mouthguard type soft tray
  70. 70. RECENT ADVANCES A. Pro-Argin technology B. NovaMin C. Casein Derivatives
  71. 71. A) PRO-ARGIN TECHNOLOGY • “Saliva based composition” i>Arginine (an aminoacid which is positively charged at physiological pH) ii>Bicarbonate (pH buffer) iii>Calcium carbonate (source of calcium) • Commercially available as ProClude (instant relief which lasts upto 28days)
  72. 72. • COLGATE has combined ARGININE , CALCIUM CARBONATE & FLUORIDE and this has been clinically proven to provide lasting relief
  73. 73. B) NOVAMIN • Bioactive glass ceramic material that provides calcium and phosphate • Calcium sodium phosphosilicate reacts when exposed to aqueous medium to release calcium & phosphate ions which form hydroxy-carbonate apatite
  74. 74. D) CASEIN DERIVATIVES • Predominant phosphoprotein in BOVINE milk • In alkaline conditions calcium phosphate is prsent as an alkaline amorphous phase along with casein referred to as casein phosphopeptide-amorphous calcium phosphate • CPP-ACP : cariostatic agent
  75. 75. USES : • Preventive therapy in high caries risk patients • Reduce dental erosion • Repair enamel involving white spot lesions • Orthodontic decalcification • Desensitizing agent
  76. 76. F)CALM-IT DESENSITIZER • Calm-it™ Desensitizer is glutaraldehyde-based desensitizer that functions by reacting/cross- linking with plasma proteins in dentinal fluid
  77. 77. • Protection for upto 6-months-This simple & effective technique reduces hypersensitivity & eliminates discomfort from cervical erosion. • Tubule penetration in seconds • Compatibility with adhesives, cements, restoratives, amalgams, core build-up & temporary materials
  78. 78. G) GLU-SENSE • The no-drip HEMA/Glutaraldehyde desensitizer that goes where you place it. • 35%HEMA/5%Glutaraldehyde gel formulation • acts in seconds to seal dentinal tubules, preventing the fluid shift in them.
  79. 79. • Rub on sensitive area for 30 seconds & allow to dry. Tooth does not need to be completely dry before application. No etching or light curing necessary. Avoid contact with soft tissue. • Effect lasts 6 months or longer depending on patient. Permanent under restorations. • Does not interfere with cements or bonding agents
  80. 80. H)GEL-KAM DENTIN BLOCK • Consists of 0.9% sodium fluoride,0.4% stannous fluoride & 0.14% hydrogen fluoride that can be applied in a tray.
  81. 81. CONCLUSION Screen patients (does the patient suffer from stabs of pain or sensitivity) Obtain patient history Examine patients to exclude : •Cracked tooth syndrome •Fractured restorations •Caries •Post operative sensitivity •Vital bleaching •Traumatic occlusion No treatment YES NO
  82. 82. Is your patient’s history consistent with dentin hypersensitivity Confirm the diagnosis Initiate management Follow up Seek and treat other causes
  83. 83. REFERANCES  Textbook of operative dentistry-Vimal K Sikri III edition  Clinical Operative Dentistry-Ramya Raghu,Raghu Srinivasan  Tooth wear & sensitivity- Martin Addy,Graham Embery,W. Michael Edgar, Robin Orchardson.  Treatment of dentin hypersensitivity-DCNA 2011  Dentin hypersensitivity: Recent Trends in Management- J CONS DENT, oct-dec 2010  Clinical Dentin Hypersensitivity: Understanding the causes & prescribing the treatment- Journal of Contemporary Dental Practice.  Dentin hypersensitivity : Etiology,diagnosis and management – A peer-reviewed publication.Howard E Strassler DMD,FADM,FACD and Francis G Serio DMD,MS,MBA,FACD