UOL PRD Flashcards
Dental Plaque
A soft layer composed mainly of bacteria which forms on the hard structures of the mouth and is present in all mouths
Dental Biolfilm
A complex association of many different bacteria in a single environment
Features of Biolfim
Bacteria more resistant to environmental changes
Reduced susceptibility to antimicrobial agents
Lower nutritional requirements
Materia Alba
Soft accumulation of bacteria, dead cells and food debris that is loosely adhered to teeth
Pellicle
A thin layer of salivary proteins
Calculus
A hard deposit of mi realised plaque which is invariable covered with a layer of soft plaque
Composition of dental plaque
Bacteria
Inorganic
Organic
Organic components of plaque
Polysaccharides
Glycoproteins
Lipids
Inorganic components of plaque
Calcium Phosphate Sodium Potassium Fluoride
Plaque formation
Pellicle
initial colonisation by pioneer bacteria
Secondary colonisation
Maturation of plaque
How does the dental pellicle adhere to teeth
Electrostatic affinity
Initial pioneer bacteria
Gram positive facultative bacteria
Streptococcus sanguis
Actinomycetes viscosus
Streptococcus Oralia
Secondary colonisation bacteria
Fusobacterium nucleatum Porphyromonas gingivalis Prevotella intermedia Prevotella losechii Capnocytophagya
Tooth associated bacteria
Streptococcus sanguis
Streptococcus mitus
Actinomycetes viscosus
Actinomycetes naeslundi
Tissue associated bacteria
Gram negative rods, cocci, filaments, flagellated rods, spirochetes
Prevotella intermedia
Porphryomonas ginigvalis
Bacteriodes Forsythus
Aggregebacter actinomycetesmcomitans
Cariogenic bacteria
Streptococcus mutans
Actinomycetes sp
Lactobacillus acidophilus
Which study is the evidence of bacteria role in caries
1950s Orland and Keyes Germ Free Rats
High risk of caries
2-10% proportion of s.mutans in plaque
Low caries risk
0.1% s.mutans In plaque
Predominant bacteria in enamel pits and fissures
Streptococcus mutans
Predominant bacteria on approximately smooth surfaces
Actinomycetes
Predominant bacteria on exposed root surfaces
Streptococcus mutans
Actinomycetes
Lactobacillus sp
Local risk factors
Influence which sites develop disease
Systemic risk factors
Influence which individuals develop disease
Modifies the host response to plaque
Periodontal pathogens
Porphyromonas gingivalis
Prevotella intermedia
Aggregebacter Actinomycetemcomitans
3 plaque hypothesis
Specific
Non-specific
Ecological
Non Specific plaque hypotheses
The quantity of plaque matters - gingivitis
Specific plaque hypothesis
The quality of plaque matters - aggressive periodontitis
Ecological plaque hypothesis
Small number of interacting species may cause destruction (unified theory) - chronic periodontitis
Medications that cause DIGO
Calcium channel blockers
Phenytoin
Cyclosporine
Systemic diseases that effect the host response
Diabetes Infections Osteoporosis CV disease Haematological diseases
Inherited syndromes effecting the immune response
Leukocyte adhesion deficiencies Checliak - Higashi syndrome Ehlers-Danlos syndrome Hyphophosphatasia Down’s syndrome Papillon-lefevre syndrome
What % of damage is caused by host response
80%
What % of damage is caused by bacteria
20%
Nutritional deficiency in periodontal disease
Lack of Vit C / scurvy
Pro-inflammatory foods
Saturated fats
Refined carbohydrates
Anti inflammatory foods
Fruit and veg
Adipose tissues store what
Cytokines
Cytokines and adoteases are anti inflammatory or pro inflammatory
Pro inflammatory
Increased prevalence in periodontal disease in what race
Chinese
Asians
Afro-Caribbean’s
Systemic risk factors (11)
Smoking Diabetes Medications Systemic diseases Nutrition Obesity Race Gender Genetics Stress Hormonal changes
second biggest risk factor after smoking
Diabetes
What % of people have diabetes
5%
What is the relationship between perio and diabetes
Bi-directional
Test for diabetes
HBA1C
AGES stands for
Advanced glycated end products
Severity of gingivitis correlates with which hormone
Progesterone
Junctional epithelium
Highly specialised Non-keratinised Fast turnover 20-30 cells thick Attached via hemidesmasomes
Compact bone
Oral and buccal cortical plates
Thin compact layer lining the socket
Cancellous bone
In between contact layers
Gingival fibres (4)
Transeptal fibres
Circular fibres
Dentogingival fibres
Alveolar crest fibres
Lamina Dura
A radiographic term denoting the thin plate of compact bone that lies adjacent to the PDL and lines the socket
PDL features
0.1-0.3mm wide Constantly breaks down and renewed Cells - fibroblasts, cementoblasts, osteoblasts, osteoclasts Blood vessels Nerves Lymphocytes
Principal Periodontal Fibres (5)
Dento-alveolar crest Horizontal Oblique Apical Interradicular
Composition of calculus
80% inorganic
20% organic
Inorganic calculus salts
Calcium phosphate
Calcium carbonate
Magnesium phosphate
Fluoride
Principal crystalline forms (4)
Calcium hydroxyapatite
Magnesium whitlockite
Octocalcium phosphate
Calcium brush it every
Organic portion of calculus
Proteins Carbohydrates Non-vital organisms Dead epithelial cells Leukocytes
When does precipitation of calculus begin
1-14 days after plaque growth
May be as early as 4-8 hrs
Theories of calculus formation
Nucleation theory - most likely theory (seeding)
Precipitation theory - precipitation of mineral ions from saliva
Attachment of calculus to tooth
Acquired pellicle
to irregularities in tooth surface
Holes in roots where sharpeys fibres were inserted
Direct contact - calcium deposit interlocked with crystals of tooth
Stain
Discolouration spot or mark caused by contact with foreign matter
Not easily removed
Extrinsic
Originating from without
Mineralised and can be removed by scaling or polishing
Intrinsic stain
Integral part of tooth structure cannot be removed by scaling
Examples of extrinsic stain
Metallic
Tobacco
Food and drink
Examples of intrinsic stain
Non vital tooth
Tetracycline
Fluorosis
1989 classifications of periodontitis
Adult Early onset Systemic disease ANUG Refractory
1999 classification of periodontitis
Chronic Aggressive NUG/NUP Systemic Periodontal abscess Perio endo legions
Severity of disease
Mild 1-2mm CAL
Moderation 3-4mm CAL
Severe >5mm CAL
Localised %
<30%
Generalised %
> 30%
Aetiology of periapical abscesses
Insult to tooth Acute pulpitis Pulpal necrosis Acute periapical periodontitis Acute periapical abscess Acute chronic
Aetiology of periodontal abscess
Pre-existing periodontal pocket
Foreign body impact ion
Compromised immune system
Response to incomplete treatment
Symptoms of pulpal \ periapical abscess
Non-vital Swelling over apex Sinus over apex TTP+++ Bone loss at apex
Symptoms of periodontal abscess
Vital tooth Swelling near gingival margin Drain through pocket TTP+ Marginal bone loss Deep probing depths Evidence of further perio disease May be an increase in mobility
Difficulties in differential diagnosis
Pulp vitality Position of swelling sinus TTP Radiographic appearances
Where can the abscess of upper lateral track to
Upper FPM
Immediate tx for acute periodontal abscess
Drainage of abscess achieved by instrumentation
LA +RSD
ABS not used routinely
Systemic medical factors
Longterm tx of periodontal abscess
OHI Scale + RSD Addressing risk factors Supporting care (Local antimicrobials) Periodontal surgery XLA
Immediate tx for pericoronal abscess
Address acute phas LA and RSD Possible irrigation Systemic ABS if systemic involvement Possible adjustment of occlusion
Longterm tx of pericoronal abscess
Surgical excision of tissue
Possible XLA of offending tooth
Local anastheisa for mandibular molars
IDB + lingual
Long buccal
LA for mandibular premolars
Incisive, IDB, Lingual
mental
LA of maxillary molars
Posterior superior alveolar nerve
LA of Maxillary Incisors
Anterior superior alveolar nerve
Nasopalatine
Alternative terms for initial therapy
Cause related therapy
Hygiene phase therapy
Dental prophylaxis
NPT
Other phases of periodontal treatment
Active phase (periodontal therapy) Supportive care ( long term monitoring)
Aim of initial therapy
Control dental plaque
Sufficiently resolve gingival inflammation
Improve other clinical features
Objects of initial therapy
A patient who is aware of an improvement of their condition
A month which the health of the periodontium has improved
Teeth that a free from deposits
Adjuncts to initial therapy
Relief of pain
XLA of teeth with poor prognosis
Endodontics to resolve acute periapical infection
Removal of gross caries - place temporary restorations
Smoking cessation
Management of dentine sensitivity
What do patients need to complete IT
Motivation Information Manual dexterity Time Money Support
Patients role in IT
Effective plaque control
Modify risk factors
Good attendance for TX
Factors that influence patient motivation
Every patients motivation will be different
Mouth measures for end point of initial therapy
Reduction of BOP, inflammation, swelling, erythema
Clinical response to NSPT
Moderate pockets 4-6 mm ppd - 1m reduction
Deep Pockets >7mm ppd - 2 mum reduction
Pockets >5mm 1-2mm recession
Definition of pseudorecession
When a tooth erupts it takes some time for the gingival margin to reach its adult position. The gingival position of the margin on a atooth in its adult position the adjacent tooth is placed more coronally
What biotype is associated with pockets
Thick
What biotype is associated with recession
Thin
Does recession increase or decrease with age
Increase
Intrinsic factors that predispose to recession
Bone - fenestration \ bony dehiscence
attached gingiva - width and thickness
Biotype
Extrinsic factor that predispose recession
Mechanical - oral hygiene practices Iatrogenic Factitious Accidentally Chemical Malocclusion
How does plaque cause recession
Rate ridges enlongate with inflammation
When ridges from the sulcular epithelium join ridges from the oral epithelium the intervening connective tissue is displaced from th blood supply to the epithelium is cut off resulting in atrophy
Class I recession
Recession within the attached ginigiva
Full height papilla
Class II recession
Recession at or beyond MGJ
Full height papilla
Class III
recession recession at or beyond MGJ
Reduced height papilla
Apical extent to recession
Class IV recession
Recession at or beyond MGJ
Flat gingival contour
Management of gingival recession
Inform the patient Instigate plaque control Removal of PRFS Treat dentine sensitivity Restore abrasion / erosion lesions Restore carious lesions Patient reassurance Monitor and maintain
What is gingival overgrowth
Non specific term that means an increase in size of the gingivae seen clinically
Gingival hyperplasia
An enlargement due to an increase in gingival tissue seen pathologically
Gingival overgrowth may be
Localised or generalised
Gingival overgrowth may be
Oedematous or fibrous
How do you differentiate between oedematous and fibrous enlargement
Check for pitting oedema
Epulis
A localised gingival enlargement
Aetiology of gingival overgrowth
Plaque DIGO Gingival fibromatotsis Granulomatus disease Idiopathic
Risk factors for DIGO
age - children and teens more susceptible
Males more suceptible
Drug dosage does not affect susceptibility
Combination of drugs can increase severity
Management of DIGO
NSPT
Surgical reduction
Management of gingival overgrowth
Control plaque to eradicate oedema Consider change in Meds Consider surgical reduction Monitor plaque control Monitor gingival contour
Management of epulides
Control plaque to eradicate oedema
Consider aetiology may regress spontaneously
Monitor plaque control
Monitor gingival contour
What does BOP indicate
Active disease
Symptoms of acute hermetic gingivostomatitis
Feeling unwell
Fever >39
Raised lymph glands
Very sore mouth
Signs of acute hermetic gingivostomatitis
Vesicles in mouth
Burst to form ulcers
Red swollen bleeding gingiva
Aetiology of NUG
Predisposing factors + bacteria
Symptoms of NUG
V.sore bleeding gingivae
Metallic taste
Bad breath
Periodontal microorganisms in NUG
Fusobacteriium nucleatum
Treponema Vicenti
Prevotella intermedia
Clinical features of NUG
Seasonal Dirty mouths Localised\generalised V.painful Spontaneous bleeding Powerful halitosis Ulceration Loss of papillae Sloughing Ischaemic tissues
Treatment of NUG
Local debridement
6% hydrogen peroxide/0.2% CHX
Systemic metronidazole
10 day follow up
Treatment of acute periocoronitits
Immediate Curette and irrigate Plaque control ABs / analgesics XLA opposing teeth
Fremitus
Tooth movement when teeth come into contact
Class 2 div 2 - palate
Factitious
Factitious gingivitis
Gingivitis artefacta
Pernicious habits
Antimicrobial agents in toothpaste And MW
Triclosan CHX Fluoride Stannous fluoride Essential oils Cecile peridium chloride SLS
Bactericidal
Kill bacteria
Bacteriostatic
Inhibit multiplication to allow host defence to destroy
When should systemic ABs be used
Aggressive perio
NUG/NUP
Periodontal abscess
What is the main problem with topical antimicrobial therapy
Main problem is achieving a high enough concentration in the pocketfor a sufficient amount of time
When would topical antimicrobial agents be used
Isolated pockets >5mm which have not responded to NSPT
Periochip
Biodegradable 2.5mg CHX digluconate in gelatine base
XaN CHX Gel
Muck adhesive biodegradable gel in xantham gum
CHX glauconite and CHX dihydrochloride 1:2
Smoking effects on the host response
Reduced PMN chemotaxis Reduced salivary IgA Reduced serum IgG Reduced T-Helper Cells Increase TNF-A
Which teeth are involved in localised aggressive
First molars
Incisors
Which teeth are involved In generalised aggressive
> 3 permanent teeth other than first molars and incisors
Three bacteria involved in agressive
Aggregebacter actinomycetesmcomitans
Porphyromonas gingivalis
Prevotella intermedia
Management of aggressive
Early diagnosis and recognition
What BSP complexity level is aggressive
3
Adjunct ABs for aggressive
Combination of MEtronidazole 200mg
Amoxicillin 500mg
3x daily 7-10 days
Virulence factors
Enzymes
Toxins
Metabolic waste products
Three enzymes in tissue destruction
Collagenase
Hyaluronidase
Elastase
Toxins of tissue destruction
Endotoxins lipopolysaccharides
Release from/cell walls of G -ve bacteria when they die
Attache loosely to cementum
Potent stimulators of the immune response
Metabolic waste products in tissue destruction
Ammonia
Hydrogen sulphide
Three potential mechanisms for periodontal tissue destruction
Bacteria - invade local ST \ release virulence factors
Host response - innate\adaptive immune system
Environmental factors
The innate immune system
Inborn, non specific, inflammatory response
The adaptive immune system
Acquired specific
2 parts of the innate response
Fluid
Cellular
2 parts of the adaptive response
Anti body mediated
Cell mediated
Host defence
Saliva GCF Epithelium Inflammatory response Immune response Mediators between inflammation, immunity and tissues
How does saliva work as part of the immune response
Aids the ingestion of bacteria
Contains antibacterial substances lysozome and IgA
Swallowing bacteria > activation of lymphocytes
lymphocytes travel to salivary gland and secrete IgA
Binds to bacteria disrupting their attachment
What induces inflammatory response and induces neutrophil emigration
IL-1b
Three main cytokines
IL-1b IL-6 TNF-a
Which t lympocytes destroy antibodies
Cytotoxic
What is the fluid reaction
Increase in GCF
What is involved in the cellular reaction
PMNs and macrophages
What do cytokines do
Act like hormones Cooperate with other cytokines to enhance their effects Initiate and enhance immune response Can cause bystander damage Strong association with bone resorption
Which cells are antigen presenting
B lymphocytes
Macrophages
Good records are what ? 6 Cs S
Complete Contemporaneous Clear Concise Correct Constrained Signed and dated
What records are required with regards to periodontal diagnosis
RMH - smoking status BPE FPA Rads + results Study models \ photos
What inhibits collagenase
Doxycycline
What surgery would you do to treat recession
Coronal flap
What causes bystander damage
Inflammatory mediators
What BPE codes are used on children and why
0,1,2
False pocketing due to mixed dentition
Other names for pregnancy epulis
Pregnancy tumour
Pregnancy granuloma
Pregnancy associated progenitor granuloma
When is best to carry out periodontal treatment on a pregnant woman
Second trimester
Can radiographs be taken during pregnancy
Yes if deemed appropriate
How long after surgery can you refere back to gdp
12 months
When should a FPA be carried out after surgery
12 weeks then annually
What is the optimum distance between bone margin and CEJ
2-3mm
What radiographs should be carried out for
Generalised pockets
BPE code 3
4-5mm
Horizontal BWs + PAs
What radiographs should be carried out for
Generalised pockets
BPE code 4
>6mm
Vertical BWs + PAs
What radiographs should be carried out for
Symptomatic 3rd molars
OPG + PAs
What radiographs should be carried out for
Perio-endo lesions
PAs
What should be included in a radiographic report
Image quality
Teeth present
Bone loss %
Pattern of bone loss - horizontal or vertical
Distribution of bone loss - localised or generalised
Calculus present
Furcation involvement
Other features of radiographic reports
Overhangs PRF Periapical pathology Root fracture Perio endo lesion Abnormal tooth lengths or morphology Caries
What is host modulation therapy
Involves reducing the destructive components of the host response in periodontitis so that the periodontal breakdown is reduced and wound healing is enhanced
Why is some collagen destruction necessary
To allow polymporphs to travel to bacteria to phagocytose them
What destroys collagen in a non-specific manner
MMPS
What host response modulators are used as adjuncts to NSPT
NSAIDs
Bisphosponates
Subantimicrobial dose doxycycline SDD
Give an example of SDD
Periostat
Periostat
20mg 2x daily for 9 months
Inhibits MMP activity
Encourages repair and healing