Equipment, periodontal therapy, oral surgery principles Flashcards

1
Q

Dental equipment

A

Powered equipment on dental trolley

Intra-oral radiography equipment

Lighting

(Magnification)

Table with drainage

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2
Q

Powered equipment on dental trolley

A

High speed handpiece

Low speed handpiece

Three-way syringe

Ultrasonographic scaler

(suction)

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3
Q

High speed handpiece

A

Air-powered turbine operates at 300,000 to 400,000 RPM

Uses friction grip (FG) burs

Used for cutting and shaping tooth/bone

Irrigation spray to reduce keep cool and remove debris

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4
Q

Friction grip burs - types

A

Round (tungsten carbide)

Cross-cut fissure taper (tungsten carbide)

DIamond burs

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5
Q

Round friction grip (FG) burs

A

Variety of sizes

Used for:
§ Removing buccal bone during open extractions
§ Removing coronal remnants during coronectomy
§ Smoothing alveolar bone
§ Small sizes used to create gutters in periodontal ligament space to aid positioning of luxators/elevators

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6
Q

Cross-cut fissure taper friction grip burs

A

Variety of sizes

Used for:
§ Sectioning teeth
§ Coronectomy
§ Buccal bone removal (shank held parallel to tooth root axis)

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7
Q

Diamond burs (friction grip burs)

A

Variety of shapes, sizes, and grit

Round, egg, taper all useful

Less aggressive than tungsten carbide

Used for
§ Smoothing alveolar bone
§ Debriding granulation tissue from alveolus
§ Gingivoplasty

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8
Q

Low speed handpiece

A

High torque, low speed
○ 5000-25000 RPM

Can be fitted straight or contra-angle nose cone

Nose cones gear ratios vary to increase/decrease speed

Most commonly used in general practice with 4:1 reduction gear for polishing

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9
Q

Three way syringe

A

Produces stream of air, water, or spray of air/water

Rinsing away debris, polish etc.

Drying tissues

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10
Q

Ultrasonic scaler

A

Magnetorestrictive or piezoelectric

Tip vibrates at 25,000 - 45,000 Hz

Plaque/calculus removed by mechanical “chipping”, but cavitation effects likely to play a role

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11
Q

Suction

A

Included on some dental machines

Stand alone surgical suction can also be used

Useful for clearing surgical field (e.g. retrieving root remnants)

Range of tips available

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12
Q

Lighting for dentistry

A

Don’t operate in the dark!

Use magnification if available

Adjustable overhead lighting acceptable
○ Will need constant repositioning
○ Difficult to position into caudal oral cavity without surgeon shadow

Head-mounted light source preferable
○ Can be bought cheaply from camping shops
○ Surgical light with loupes ideal

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13
Q

Examinatio instruments

A

Dental probe

Sharp explorer

Mirror

Modified pen grip

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14
Q

Dental probe

A

Blunt end to avoid trauma to soft tissue in sulcus

mm markings - NB different patterns

Check against ruler before starting to chart

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15
Q

Sharp explorer

A

Sharp point for detecting defects in hard tissues

Used perpendicular to tooth surface

Never use on soft tissue

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16
Q

Mirror

A

Make yourself use one

Takes practice but makes charting much quicker and easier

17
Q

Modified pen grip

A

Used for most dental instruments including scaler and high/low speed handpieces

Use fourth and fifth fingers to stabilise hand

18
Q

Extraction instruments

A

Scalpel: #15 or #11 - ideally round handle

Dental luxators

Dental elevators

Periosteal elevators

Extraction forceps

Root tip forceps

Thumb forceps

Scissors

Needle holders

Retractors

19
Q

Dental luxators

A

Fine, sharp tip

Select size which corresponds to root curvature

Inserted into periodontal ligament space and used to cut the ligament fibres

Used with gentle side-to-side rocking motion

Wedge effect helps to expand alveolus (socket)

Must NOT be used with rotational force - easily damaged

Must be sharpened regularly

20
Q

Dental elevators

A

Select size which corresponds to root curvature

Tip is inserted into periodontal ligament, rotational force applied and held for 10-20 seconds

Periodontal ligament fibres stretch, then tear

Winged design provides increased leverage

21
Q

How to hold luxators/elevators

A

Handle should fit in the palm
○ Different size handles are now available to fit all hand sizes!

Short finger stop
○ Index finger placed close to sharp tip
○ Essential to avoid iatrogenic damage if instrument slips

22
Q

Periosteal elevators

A

Used to elevate mucoperiosteal flaps away from the bone

Used in pushing motion with rotation

Keep index finger close to tip to prevent damage if slips

23
Q

Extraction forceps

A

Small breed size most useful

Only to be used once tooth is mobile following luxation/elevation

Place as far apically as possible

Can use gentle rotational force and hold (as for elevation)

24
Q

Manual scaling instruments

A

Hand scalers

Calculus forceps

Hand curettes

25
Q

Hand scalers

A

Must be kept sharp

Used in a pull stroke away from the soft tissues

Only used above the gingival margin (sharp toe and heel would damage delicate soft tissues)

26
Q

Calculus forceps

A

Can be ised for gross calculus removal

27
Q

Hand curettes

A

Must be kept sharp

Rounded toe and heal to reduce soft tissue trauma

Used for root planing in areas of attachment loss
§ Closed root planning in pockets of up to 5mm deep
§ Curette introduced into sulcus with face closed
§ Once bottom reached, angle is opened to bring working edge into contact with root surface
§ Overlapping pull strokes used to remove plaque/calculus and smooth the cementum

28
Q

Polishing

A

Possibly removes microscopic defects in enamel following scaling

Removes residual microscopic deposits of plaque/calculus

Risk of iatrogenic damage minimised by:
○ Light pressure
○ Low speed
○ <3 seconds per tooth
○ Use only fine pumice slurry
○ Use of an oscillating rather than rotary cups

Following polishing sulcus should be irrigated with water or 0.12% chlorhexidine solution

Importance is debatable

29
Q

Principles of oral surgery

A

Antimicrobials not usually indicated

Halsted’s principles

Oral soft tissues heal rapidly

Most oral wound dehiscence caused by errors in technique

30
Q

Halsted’s principles

A

Gentle handling of tissue

Meticulous haemostasis

Preservation of blood supply

Strict aseptic technique

Minimum tension on tissues

Accurate tissue apposition

Obliteration of deadspace

31
Q

Gentle handling of tissue

A

Particularly true for the delicate oral soft tissues

Avoid using forceps as far as possible
§ If must then use atraumatic such as Adson 1x2

Use fingers or stay sutures to reduce crushing damage

Retract soft tissues away from burs with plastic mixing sticks

32
Q

Meticulous haemostasis

A

Perhaps less important in oral surgery

Blood clot in alveolus important for healing

Avoid diathermy - risk of thermal damage to underlying bone/teeth

Avoid neurovascular bundles - ligation where necessary

Haemostatic agents (e.g. lysostypt)

33
Q

Preservation of blood supply

A

Use envelope flaps where possible

Rostral vertical incision for triangle flaps

Ensure divergent incisions and wide base for pedicle flaps

Protect neurovascular structures

Do not overtighten sutures

34
Q

Strict aseptic technique

A

True asepsis not achievable in oral surgery

Routine hand hygiene

Sterile gloves and drapes for major maxillofacial surgery

Rinse mouth with 0.12% CHX

Periodontal prophylaxis BEFORE surgery

Sterilisation of instruments and hand-pieces

35
Q

Minimum tension on tissues

A

Critical in oral surgery

Utilise large flaps

Elevate periosteum releasing incision

If flap retracts when not held in place there is too much tension

36
Q

Accurate tissue apposition

A

May need to trim flap or palatal/lingual gingiva to matching shape

Accurate reconstruction of lip frenula

Ensure gingiva cuff maintained around residual teeth

37
Q

Obliteration of dead space

A

Design flaps so that suture line is supported by healthy underlying bone

Consider filling voids with bone grafting material