dental materials Flashcards
1
Q
What are some diagnostic tools?
A
- Clinical exam
- Radiographs (RB4-6)
- probe depth of lesion
- triplex/cotton roll to dry
- clean off plaque for visibility
2
Q
List some important diagnostic knowledge
A
- is it cavitated?
- is there shadowing
- is the caries active or arrested?
- can it be treated preventatively eg fluoride?
- is their homecare good enough to leave and monitor?
- diet?
- previous restorations?
- behaviour/compliance
- age of child-exfoliation
3
Q
When may you decide not to restore (7)?
A
- no consent
- tooth close to exfoliation
- can be treated preventatively
- tooth is abcessed-radiolucent furcation
- caries has progressed to pulp or crown & extraction may be preferable
- child won’t manage treatment
- allergy to materials
4
Q
What are dental linings
A
a thin layer of GIC placed over exposed dentine under a restoration that help to reduce microleakage and sensitivity and inhibit bacterial growth.
5
Q
How do dental linings work?
A
- prevent bacteria from entering the tooth at the margins of the restoration
- blocks opening in dentine, preventing fluid from flowing out, as well as bacteria from flowing in
6
Q
composite indications
A
- anterior cavities (aesthetics)
- small proximal slot
- patient preference
- requires well controlled field of operation
7
Q
composite contraindications
A
- large proximal (class II occlusal extension) in perm. teeth
8
Q
composite advantages
A
- adhesive (smaller cav prep)
- esthetic
- adequate wear resistance
- durable
- moderate resistance to fracture
- better public acceptance
- controlled setting
- low leakage if properly bonded
9
A
- technique sensitive
- time consuming
- difficult to detect on radiographs
- secondary caries diag may be difficult
- expensive
10
Q
GIC indications
A
- temp restoration
- lack of cooperation
- small occlusal/proximal
- tooth will exfoliate soon
- worn primary tooth
- high caries risk where fluoride release req.
11
Q
GIC contraindications
A
- perm restorations
- large proximal
- high-wear surfaces
12
Q
GIC advantages
A
- adhesive
- aesthetic
- fluoride release
- resin modified (fuji II, better controlled setting time)
- low leakage
13
Q
GIC disadvantages
A
- setting time (fuji IX)
- lack of proven durability
- technique sensitive- moisture
- brittle
- susceptible to erosion and wear
- hard to detect radiographically
- high wear on chewing surfaces
14
Q
Compomer indications
A
- small occlusal and proximal of prim teeth
- small non-load restorations
15
Q
Compomer contraindications
A
- perm restorations
- large proximal restorations
16
Q
Compomer advantages
A
- adhesive
- aesthetic
- fluoride release
- simple to handle
- controlled setting
- radiopacity
-low leakage if properly bonded
17
Q
Compomer disadvantages
A
- better wear resistance than GIC
- Technique sensitive
- Poor load-bearing durability
- high wear on chewing surfaces
- low to moderate fracture resistance
- technique sensitive-low water resistance
18
Q
Stainless steel crown indications
A
- large cavities in prim teeth
- pulpotomy
- pulpectomy
- hypoplastic teeth
- hall technique
19
Q
Stainless steel crown contraindications
A
- uncooperative patient
20
Q
Stainless steel crown advantages
A
- very durable
- protects remaining tooth (pulpotomies compromise tooth)
- economic long term?
21
Q
Stainless steel crown disadvantages
A
- aesthetics
- excessive removal of sound tooth
- expensive (for sds)
22
Q
Amalgam indications
A
- large proximal cavities
- posterior teeth (high masticatory forces)
23
Q
Amalgam contraindications
A
- anterior teeth (aesthetics)
- primary teeth due to exfoliate
- patient preference
- worn primary teeth
24
Q
Amalgam advantages
A
- quick & simple
- inexpensive
- tolerant to a wide range of clinical conditions
- moderately tolerant to moisture
- durable
- high wear resistance
25
Q
Amalgam disadvantages
A
- not adhesive- mechanical retention-> loss of more tooth tissue
- not aesthetic
- public concerns (toxicity)
- Can chip on edges
- Moderate leakage
