companion animal dentistry
TRANSCRIPT
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Teerapol C.
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what is the normal bitedental formulae for:
• adult dog/cat
basic instruments used for extractioni di atio fo adult dog/cat
• 8 week old pup/kittenperiodontal disease
d fi iti
indications for extractiontechnique for
• definitions• aetiology• predisposing factors
technique for extraction of:
• incisorsp p gdental prophy
• describe instruments• steps of the prophy
• canines• multi-rooted teeth
• steps of the prophy
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incisors• front of mouth• used for:
“ i i ” t “nipping” at preyto remove skin off kill before eatingto “catch” fleas etc.
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incisors
canines• large killing teeth• used to pick up
food/toys y
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incisors
canines canines
premolars• behind the canines• have a deciduous
precursor [baby tooth] -p [ y ]except for PM1’s
• cut food into pieces small enough to small enough to swallow
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incisors
canines
premolars
lmolars• most caudal teeth• used for chewing• used for chewing• no deciduous precursor
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carnassial teeth
• upper 4th premolar & lower 1st molar
• very large teeth
• used to crack through bones
• overlap each other
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Occlusion = position f th t th l ti t of the teeth relative to
each other
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Incisor scissor biteIncisor scissor bite• Upper incisors just
rostral to lowers & make contact
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Incisor scissor bite Incisor scissor bite • Upper incisors just
rostral to lowers & make contact
Lower canine position
• Between upper I3 &C & no contact witheither
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Incisor scissor biteIncisor scissor bite• Upper incisors just
rostral to lowers & make contact
Lower canine position• Between upper I3 &• Between upper I3 &
C & no contact witheither
P l Premolars interdigitate
• Lower P1 most rostralLower P1 most rostral
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Incisor scissor biteIncisor scissor bite• Upper incisors just
rostral to lowers & make contactmake contact
Lower canine position
• Between upper I3 &C & no contact witheither
P l Premolars interdigitate
• Lower P1 most rostralLower P1 most rostralUpper 4th premolars
• lateral to lower 1st molarsmolars
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= teeth not in the correct positionposition
i.e. incorrect “bite”
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Flowing river
CLIFF
POND
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Flowing river
CLIFFt l d i water lands in
the pond = normal
POND
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Flowing river – flow rate increases
CLIFF
water lands POND past the pond
= overshoots
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Flowing river – slowed in drought
CLIFF water lands before the pond = the pond = undershoots
POND
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Overshot bite
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Undershot bite
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Base Narrow
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Wry bite
8 month old bull terrier
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What is the consequence?q
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EnamelOuter layer of the crown
enamelOuter layer of the crown
CementumOuter layer of the root
dentine
Outer layer of the root
DentineMiddle layer
gingiva
sulcus
Middle layer
Pulp PDL
Inner core
cementum
pulp
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enameldenti enameldentine
pulp
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Adult dog
8 eek old do8 week old dog
Adult catAdult cat
8 week old kitten
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Remember the ”marker teeth” = carnassials
Upper carnassial is the ………….
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Remember the ”marker teeth” = carnassials
Upper carnassial is the 4th premolar4th premolar
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Remember the ”marker teeth” = carnassials
Upper carnassial is the 4th premolar4th premolarLower carnassial is the ………….
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Remember the ”marker teeth” = carnassials
Upper carnassial is the 4th premolar4th premolarLower carnassial is the 1st molar1st molar
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2 x ( I, C 1/1, P, M ) =
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2 x ( I , C 1/1, P , M ) = 42
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2 x ( I 3/3, C 1/1, P, M ) = 42
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2 x ( I 3/3, C 1/1, P 4/4, M ) = 42
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2 x ( I 3/3, C 1/1, P 4/4, M 2/3 ) = 42
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2 x ( i, c 1/1, p) =
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2 x ( i 3/3, c 1/1, p 3/3) =
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2 x ( i 3/3, c 1/1, p 3/3) = 28
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Deciduous:Deciduous:
2 x ( i 3/3 c 1/1 p ) =2 x ( i 3/3, c 1/1, p ) =
Permanent:
2 x ( I 3/3, C 1/1, P, M ) =
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Deciduous:Deciduous:
2 x ( i 3/3 c 1/1 p 3/2 ) = 262 x ( i 3/3, c 1/1, p 3/2 ) = 26
Permanent:
2 x ( I 3/3, C 1/1, P 3/2, M 1/1 ) = 30
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Support of the teeth
Periodontal ligament
Gingivae
Alveolar bone
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NORMAL HEALTHY GINGIVA
Thin gum imargins
Deposit-free teethteeth
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Disease of the supporting structures of the teeth (gingiva, periodontal ligament & alveolar bone)
Gingivitis:• reversible inflammation of the marginal gingivareversible inflammation of the marginal gingiva
Periodontitis:• irreversible inflammation of the gingiva & supra-
alveolar tissue with loss of connective tissue attachment & bone (i.e. loss of periodontal support)attachment & bone (i.e. loss of periodontal support)
Gingivitis is a precursor to periodontitis!!!!
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GINGIVITIS
Gums swollen & oedematous
Bleed easily on probing
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PERIODONTITIS
Supporting bone loss
Severe inflammatory reactionSevere inflammatory reaction
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ADVANCED PERIODONTITIS
Heavy calculus build upHeavy calculus build-up
Pus
Tooth mobility, supporting bone loss > 50%, possible systemic disease
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Plaque Plaque Plaque & Plaque, Plaque, Plaque &
Plaque
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Bacterial plaque adheres to all surfaces of the teeth
Ba te ial la e a ot be i ed off ( eed Bacterial plaque cannot be rinsed off (needs mechanical removal)
Bacterial plaque becomes mineralised to form calculus
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PremolarMolar
Canine
Incisor
PremolarMolar
Premolar
Deciduous 2(Di 3/3, Dc 0/0, Dm 3/3)Permament 2(I 3/3, C 1/1 or 0/0, PM 3/3 or 4/4 M 3/3)
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Th t thThe tooth• The horse has what is know as
hypsodont dentition (High hypsodont dentition (High crown teeth) with peripheral crown cementum. They have reserve crown, which wear off reserve crown, which wear off all the time.
• The horse has upper cheek teeth arcade 30% wider than teeth arcade 30% wider than lower this call “anisognathism”Al d i li htl • Also upper arcade is slightly curve caudally while lower arcade is straighter.
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Dental formulae• Decidous 2 × (I 3/3, C 1/1,P 3/3) = 28( , , )
but canine do not erupt through the gums.• Permanent 2 × (I 3/3, C 1/1, P 3[or 4]/3, M 3/3)( , , [ ] , )
= 40 [or 42]Note: Canine teeth often absent in mares; lower 1st
premolar (wolf teeth) may be present in some.
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This technique are based on age-related change to the dentition.relatively accurate to 6 years of age relatively accurate to 6 years of age, educated “guessing” after 7 years of ageIt is art of age determination not an direct It is art of age determination not an direct science. There are many variable; such nature, diet and diseases.The characteristic used are those of the incisor;• The eruption time
Sh d f l i i• Shape and appearance of lower incisors• Bite alignment• Present of hook and grooves on upper corner incisorsg pp
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Oral ExamEquipment needed
Adjustable halterAdjustable halterFlushing syringeF ll th S lFull mouth SpeculumLight sourceHead supportMirrorDental pickBucket
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A good quality full-mouth speculum, a light source and restraint are essential
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Detailed history is taken
• clinical historylosing weightspilling feedcolic etc.
idi /bi i• riding/bittinghistory (good guide to potential guide to potential problems)
head tossinghead tossingchewing bit etc.
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external examination• before sedation
indicates painful areas
• look for discharges, fistulae, swellings, asymmetry,
ti t reactions to palpation (especially of (especially of cheek teeth)
sedate horse
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thoroughly flush thoroughly flush the mouth out• food & material in
the mouth will hide t ti l blpotential problems
• may want to examine before examine before flushing
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inspect incisors, commiss res & commissures & lips
Photo courtesy PJ Allen
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inspect incisors, commiss res & commissures & lipspalpate diastema(for unerupted( pteeth)
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ancillary aids will be necessarynecessary
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ancillary aids will be necessarynecessary
• dental picks
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ancillary aids will be necessarynecessary
• dental picks• mirrors
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ancillary aids will be necessarynecessary
• dental picks• mirrors• retractors
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Abnormal of development and eruption• Malocclusions• Supernumerary teeth• Ectopic teethEctopic teeth• Retained deciduous teeth• Impacted teethImpacted teeth
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M l l i• Malocclusions• Brachygnathia (parrot mouth)
In this condition lower jaw is shorter jthan the upper jaw leading to overjetor overbite.
• Prognathia (sow mouth/monkey Prognathia (sow mouth/monkey mouth)This condition is less report than parrot mouth the condition is parrot mouth, the condition is reverse to parrot mouth. Lower jaw is longer than upper jaw.
Does both conditions considered to be inherited ?
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S hSupernumerary teeth• Most of this condition found
as an extra incisors (wolf as an extra incisors. (wolf teeth are not supernumerary teeth). If this present the teeth must be extract to prevent future problem
Ectopic teethEctopic teeth• Teeth erupting in an
abnormal position. This pusually result in dental trauma.
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R t i d d id t th• Retained deciduous teeth• This will causing permanet teeth to
displacing due to the retained cap displacing due to the retained cap. All caps should be remove if they are loose or are causing problem.
I t d t thImpacted teeth• The most common tooth to have this
problem is the 8’s (4th premolar) as problem is the 8 s (4th premolar), as it is the last to erupt. In some cases Wolf teeth can be unerupted, this can feel as bumb in front if the first cheek tooth.
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Abnormal of wear and periodontal diseasedisease• Molar malocclusion• Periodontal diseasePeriodontal disease• Diastema
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• MalocclusionIncisor malocclusion
S ilSmileFrownDominant teethDominant teethHookSlant
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MalocclusionMolar malocclusion– Hooks and Ramp– Step mouth
Wave mouth– Wave mouth– Exaggerated Transverse
Ridges– Shear Mouth
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Periodontal disease• This can be divided into gingivitis and g g
periodontitis. Gingivitis is the reversible inflammation of the gingival but periodontitis is often irreversible and involves inflammation of all supporting structure, gingival, periodontal ligament and alveolar bone.
“PREVENT IS BETTE THAN CURE”
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Periodontal disease
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Diastema• Diastema or interdontal spaces between cheek p
teeth.
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Treatment• Dental Work area and restrain• Corrective procedure• Time table and routine dental examinationTime table and routine dental examination
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Sharp enamel point• This usually occur on the buccal (outside)
surface of the upper cheek teeth and the lingual (inside) surface of the lower cheek teeth.The dental float (rasp contour) is held at the • The dental float (rasp, contour) is held at the aprox 45° angle to the occlusal surface and the sharp points removed. But do not rasp the sharp points removed. But do not rasp the occlusal surface or it can result in malfunction of mastication.
Other abnormalities• Hooks, Overgrowth, Wavemouth
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