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Orthodontics Lectures > Angle Appliance And Fixed Ortho > Flashcards

Angle Appliance And Fixed Ortho Flashcards

1
Q

Angle appliance definition

A

🔸Device fixed to teeth and applies forces by archwires or auxiliaries

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2
Q

Angle appliance effect

A

Any type of tooth movement in any occlusion

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3
Q

Angle appliance elements

A

Bands with vestibular tubes and vestibular archwire

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4
Q

Angle appliance requirements for individual made ring with tube

A

🔸Do not reach gingival sulcus
🔸Be open occlusal
🔸The tube must be parallel to occlusal plane
🔸First molar separated from adjacent teeth

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5
Q

Angle appliance Archwires

A

🔸For expansion
🔸For retrusion

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6
Q

Angle Archwires for expansion

A

🔸Increase the size of the dental arch
🔸Have U shaped curves

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7
Q

Angle Archwires for retrusion

A

🔸Reduce size of dental arch
🔸Have medial opened hooks soldered in canine region

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8
Q

Angle appliance ligatures

A

Single and double spring

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9
Q

Angle appliance effects

A

🔸Leveling teeth in the arch
🔸Arch expansion
🔸Incisors protrusion
🔸Incisors retrusion
🔸Good occlusion

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10
Q

Angle appliance disadvantages

A

🔸 Flared teeth
🔸Overloaded teeth
🔸Traumatized periodontal
🔸Displaced only crown of teeth

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11
Q

was designed to allow the orthodontist to place the teeth into Angles concept of the ‘line’ of occlusion’

A

Edgewise system

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12
Q

first appliance developed by angle that employed a bracket and used bands on most of teeth

A

Pin and tube system

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13
Q

Edgewise system - angle- 1925-1928

A
  1. Affects every tooth in three planes
  2. Controls the position of each dental arch segment or the entire
    dental arch
  3. Allows adjusting the ratios of jaws, which can lead to a change in the proportions of the jaw bases and jaw growth
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14
Q

Begg appliance

A

Uses concept of differential force and tipping of teeth, rather than bodily movement

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15
Q

Indications for use of fixed appliances

A

🔹Mild to moderate skeletal discrepancies
🔹Intrusion/Extrusion of teeth
🔹Correction of rotations
🔹Overbite reduction
🔹Closure of extraction spaces

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16
Q

Treatment with fixed appliances should only be given to patients with

A

🔹Good oral hygiene
🔹Good diet/avoidance of sticky foods
🔹Regular attendance

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17
Q

Components of fixed appliances

A

🔹Brackets
🔹Bands
🔹Archwires
🔹Ligatures
🔹Auxiliaries

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18
Q

Auxiliaries include

A

tubes, springs, retractors, lock pin, buttons, hooks

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19
Q

Steps in orthodontic bonding

A

🔹Cleaning
🔹Moisture control
🔹Enamel conditioning- 15-30 secs/ wash and drying
🔹Sealant application to bracket base

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20
Q

Advantages of orthodontic bonding

A

🔹More aesthetic
🔹Easier oral hygiene maintenance.
🔹 Partially erupted teeth can also be bonded
🔹Risk of caries is eliminated.
🔹 Proximal stripping is possible.
🔹 Less chair side time.
🔹 Proximal areas are available for restoration

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21
Q

Disadvantages of orthodontic bonding

A

🔹It is a weak attachment
🔹Risk of enamel demineralization
🔹 Enamel fracture can occur during debonding
🔹More bonding failure

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22
Q

requires placing the bracket at different heights on each tooth to compensate for differing crown lengths

A

Edgewise standard

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23
Q

Metal rings encircling the tooth to which buccal and often lingual attachments are welded

A

Bands

24
Q

Bands are mostly seated on

A

🔹Premolars and molars
🔹can resist more occlusal load

25
Q

Bands are mostly seated on

A

🔹Premolar and molar teeth
🔹More resistance to occlusal forces

26
Q

Types of bands

A

🔹Preformed
🔹Customised

27
Q

Separators

A

Wedge teeth open to make space for bands

28
Q

Indications for banding

A

🔹For posterior teeth attachments
🔹Teeth requiring buccal and lingual
Attachments
🔹Used when likely to contact opposing dentition when joins are closed

29
Q

Archwires

A

🔹Tied to bracket slot with help of ligatures
🔹Made of different alloys, types, shapes, size and force

30
Q

Archwires are based on

A

🔹Cross section
🔹Size
🔹Shape

31
Q

Archwire materials

A
  • Gold and Gold allays
  • Stainless steel
  • Nickel titanium alloys
  • Beta titanium
  • Cobalt chromium nickel alloys
32
Q

Stainless steel aloys characteristics

A
  • Large modulus of elasticity(stiffness)
  • Good corrosion resistance
33
Q

Colbat chromium alloys characteristics

A
  • Available in softer and formable states
34
Q

NiTI alloys characteristics

A
  • Excellent springback and flexibility
  • Shape memory
  • Super elasticity
35
Q

Beta titanium characteristics

A
  • High modulus of elasticity
  • Can be shaped
  • Good for auxillary springs and immediate and finishing archwires
36
Q

Types of arches

A
  • Tapered arch
  • Square arch
  • Ovoid arch
37
Q

Levelling definition

A

Reducing the curve of spee by intrusion and/or extrusion of teeth in an arch

38
Q

Alignment definition

A

Moving the teeth into their proper positions to conform to the line of occlusion

39
Q

Alignment requires a wire with the following characteristics

A
  • High strength
  • Low stiffness
  • Excellent spring
40
Q

When choosing alignment wires, they should

A
  • Proide light, continuous force of 50g
  • Be able to move freely within brackets
41
Q

Made in plane of archwire to compensate for differing tooth widths

A

First order bands

42
Q

Types of first order bends

A
  • Toe in
  • Inset
  • Offset
43
Q

Made in vertical plane to achieve correct mesiodistal angulation or tilt of the tooth

A

Second order bends

44
Q

Provide action in 3 planes

A

Second order bends

45
Q

Types of second order bends

A
  • Sweep
  • Loop
  • Cable
  • Tip back
  • Artistic
46
Q

Vertical bend for root inlcination
in mesio-distal

A

Artistic bend

47
Q

Used for rectangular archwires and exert buccolingual force on tooth apex-Torque

A

Third order bends

48
Q

Used to achieve more control of buccolingual root and allows bodily torqing movement

A

Rectangular wire w/rectangular slot

49
Q

Increasing diameter of archwire will affect

A

Force applied to the teeth

50
Q

Increasing the length or span or wire between brackets

A

Inversely affects applied force

51
Q

Active arch Archwires can be with

A
  • Horizontal loops-act in vertical direction and used for levelling
  • Vertical loops-act inn mesiodistal direction
52
Q

Box loops used for

A

Uprighting canines

53
Q

T-loop used for

A

uprighting premolars and molars

54
Q

Used to secure Archwire into slot

A

Wire ligatures/elastic bands

55
Q

Auxillaries

A
  • Elastic chains
  • Intra-oral elastics
  • Coils
  • Rotation springs
56
Q

Elastic chain use

A

intramaxillary traction

57
Q

Rotation spring use

A

Tooth derotation

Orthodontics Lectures (1 decks)

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