SA dentistry Flashcards
what are the segments of the triadan numbering system?
right maxillary - 1
left maxillary - 2
left mandibular - 3
right mandibular - 4
what is the dental formula for the primary dentition of a dog?
I 3/3 C 1/1 PM 3/3 (28)
what is the dental formula for the permanent dentition of a dog?
I 3/3 C 1/1 PM 4/4 M 2/3 (42)
what is the dental formula for the primary dentition of a cat?
I 3/3 C 1/1 PM 3/2 (26)
what is the dental formula for the permanent dentition of a cat?
I 3/3 C 1/1 PM 3/2 M 1/1 (40)
what are the three layers of the tooth?
enamel
dentine
pulp
how would enamel be described?
white, smooth, outer layer (very hard)
what is dentine?
softer material that encloses the pulp cavity
what forms dentine?
odontoblasts (lining pulp cavity)
what is pulp?
sensitive tissue (nerves, arteries, veins, lymphatics)
what is cementum?
avascular bone like material covering the root surface
what does periodontal ligament attach to?
root cementum to alveolar bone
what age should all deciduous dentition of kittens/puppies we present?
6 weeks
what age do permeant incisors erupt in dogs/cats?
2-5 months
what age do permanent canines erupt in dogs/cats?
3-6 months
what age to permanent premolars erupt in dogs/cats?
4-6 months
what age do permanent molars erupt in dogs/cats?
5-7 months
what is assessed on a dental examination of the head?
symmetry
lymph nodes/glands
bones/muscle
eye position
what is dolichocephalic?
elongated skull
what is occlusion?
relationship between teeth in the same and opposing jaw
what is skeletal malocclusion due to?
discrepancies in jaw length/width
what is brachygnathism?
mandible too short relative to the maxilla (overbite)
what is prognathism?
mandible too long relative to maxilla (undershot)
what are luxators used for?
cut down periodontal ligament
what are elevators used for?
breakdown/stretch periodontal ligament (pressure/leverage)
what are periosteal elevators used for?
open extractions to expose the alveolar bone
what are forceps used for in extraction?
rotational force when periodontal ligament is broken
what are the two categories of X-ray machines?
multidirectional generator head
hand-held generator
what are the advantages of direct dental radiography?
faster
easier to correct positioning faults
small sensors (one size doesn’t fit all)
what are the advantages of indirect dental radiography?
flexible sizes
films thin/easy to place
what is the disadvantage of indirect dental radiography?
films need to be developed (time and less accurate)
what is the difference between the appearance of the pulp cavity and young/old dogs?
young have much wider cavity and are open (no bone around bottom)
what is the significance of a pulp stone?
incidental in young animals
what is horizontal bone loss?
line of mandible is dropped (root exposure)
what is vertical bone loss?
bone lost perpendicular to line of mandible (root exposure)
is resorption seen more commonly in cats or dogs?
cats
what happens with type one tooth resorption?
destruction of tooth with preserved periodontal ligament
what is seen with type two tooth resorption?
destruction of tooth and periodontal ligament
what is an apical lesion also known as?
tooth root abscess
how does pulpitis appear on a radiograph?
large/widened pulp cavity (unilateral means pathology)
what teeth is parallel radiography used for?
caudal mandibular premolars and molar
how is a patient positioned for parallel radiography of teeth?
laterally with side being examined facing upwards
where is the beam for bisecting angle radiography?
perpendicular to bisecting angle between tooth root and sensor
why is bisecting angle radiography used?
doesn’t distort the tooth
can use when parallel isn’t available
what anatomical feature can pose a problem for imaging the maxillary molars/premolars in cats?
zygomatic arch
what is periodontal disease?
inflammatory and destructive condition affecting the supporting structures of the teeth
what is plaque?
a biofilm formed from aggregations of bacteria, debris and inflammatory cells
what is pellicle?
acellular film of salivary glycoproteins, polypeptides and lipids on enamel (mineralises quickly)
what is calculus?
mineralised plaque
what is gingivitis?
inflammation of soft tissue of gingiva
what is gingivitis secondary to?
plaque accumulation
what are the stages of gingivitis?
marginal gingivitis
bacteria in gingival sulcus
inflammation (enzymes and endotoxins)
what is periodontitis?
inflammation and destruction of periodontal ligament and alveolar bone
is periodontitis reversible?
no
what are some influencing factors of periodontal disease?
breed (brachycephalic) - malocclusion
immune status
developmental defects
diet
what is stage 0 periodontal disease?
normal healthy periodontium
what is stage 1 periodontal disease?
gingivitis
what is stage 2 periodontal disease?
gingivitis, plaque
what is stage 3 periodontal disease?
gingivitis, plaque and calculus
what is stage 4 periodontal disease?
gingivitis, plaque, calculus, root exposure
what are the clinical signs of periodontal disease?
halitosis salivation (blood) plaque/calculus inflamed/bleeding gingiva tooth mobility
what is the goal of treating periodontal disease?
suppress inflammation and stop disease progression
what treatment is used for periodontal disease?
reduce bacterial load (flush with chlorhexidine) scaling debridement polishing sulcular lavage extractions
what are some reasons for dental extraction?
periodontitis pulp necrosis persistent deciduous teeth abnormal response to plaque fractures tooth resorption mobile teeth caries (decay) ectopic/impacted teeth failed restorative treatment
what is closed extraction technique?
not making an incision through the gingiva (except sulcus)
what three techniques are used for closed extraction?
luxation
elevation
extraction
what is the aim of luxation?
cut through periodontal ligament
what is the aim of elevation?
fatigue the periodontal ligament and tear its attachments
when is surgical extraction technique used?
multi-rooted teeth
canines
tooth resorption/retained roots
what are the three types of commonly used flaps for surgical extraction?
envelope flap
triangle flap
pedicle flap
what is an envelope flap?
incision just into the gingival sulcus
what is a triangle flap for surgical extraction?
sulcal incision plus one releasing incisions (creates a drape like flap)
what is a pedicle flap for surgical extraction?
two releasing incisions (extensive access to alveolar space)
what is periosteal elevation?
elevation of the mucoperiosteal flap away from the underlying bone
what is alveolectomy?
removal of the alveolar bone from the buccal aspect of the tooth
what is the technique for sectioning teeth?
place burr at furcation point and cut
what are possible complications of surgical extraction?
mandibular jaw fracture soft tissue trauma oro-nasal fistula ankylosis of root retained/fractured root
when can a tooth root be left in situ?
risk of surgery outweighs the benefit of removing
how should a root tip left in situ be managed?
take radiograph
inform owner
take radiographs annually
what are the two main nerve blocks used?
caudal maxillary inferior alveolar (caudal mandibular)
what nerves are anaesthetised on a caudal maxillary nerve block?
palatine and infraorbital
where is a caudal maxillary block placed?
spongey soft tissue caudal to position of last upper tooth
what nerve is anaesthetised by a caudal mandibular block?
inferior alveolar
what are the two local anaesthetics commonly used?
lidocaine bupivicaine (longer duration)
what flap is used to extract the maxillary canine surgically?
pedicle
what is tooth resorption?
destruction of dental tissue (by odontoclasts) that is replaced by granulation tissue
what are the clinical signs of feline tooth resorption?
cold sensitivity weight loss hypersalivation pawing at face halitosis
where on the tooth is affected by type one tooth resorption?
the crown
where on the tooth is effected by type two tooth resorption?
the root
where on the tooth is effected by type three tooth resorption?
crown and root
what is gingivostomatitis?
gingivitis and inflammation of the mucosa
what factors can influence the formation of chronic gingivostomatitis?
immune status
biofilm formation
associated dental disease
calicivirus status
what are the aims of treating gingivostomatitis?
reduce oral antigen burden
improve welfare (pain)
reduce inflammation
what is a common treatment for gingivostomatitis? (surgical)
full mouth extractions (premolars and molars)
what can be used to medically manage gingivostomatitis?
pain relief (NSAIDs, buprenorphine…)
antibiotics
plaque reduction (heparinise, brushing…)
dietary supplement
what technique should be used to extract deciduous teeth?
open (surgical) - long fragile roots
what can cause discolouration to a single whole tooth?
pulpitis
what can cause discolouration to a single/isolated part of a tooth?
dentine exposure (from wear)
what can cause discolouration to multiple teeth?
staining
enamel hypoplasia
tetracycline exposure (puppies)