Pros tutorial partial dentures Flashcards
When should you start designing the denture?
Case assessment
What 4 things would you do in the case assessment for partial dentures?
- Current dentures (if any)
- Oral health and risk factors
- Assessment of occlusion
- Index teeth (if any)
What 7 questions to ask when taking a denture history ?
- length of time they had dentures
- When did they lose their teeth?
- How many dentures they had?
- What are their complaints about their current denture?
- Success and failure of previous prosthesis
- Are they dentures worn made at the same time?
*Are you wearing the most recent set?
Why do we survey casts for partial dentures?
- Determine path of insertion
- Determine position and depth of undercuts
- Determine the presence of guideplanes
How can the position of undercuts determine the denture design?
- Determine where to use clasps
- Determines areas the will prevent the denture from seating
What is the difference between the path of displacement and the path of insertion?
- the path of displacement is the direction in which the denture tends to be dislodged which is assumed to be perpendicular to the occlusal plane
- the path of insertion is the path in which the denture in inserted and removed
Describe the affect of the path of insertion and and path of displacement on denture retention?
- Retention is better when the path of insertion and displacement are different
What are 6 components of a surveyor?
- Base
- Surveying table - case is placed
- Surveying arm
- Vertical arm
- Horizontal arm
- Surveying tools
What are 4 surveying tools ?
- Analysing rod
- Graphite marker
- Undercut gauges
- Wax knife
4 advantages of CoCr over acrylic?
- Stronger
- Thinner
- Better tolerated
- Less damaging to periodontium
2 Disadvantages of Cocr in relation to acrylic?
- Difficult to add to
- More expensive
2 advantages of acrylic in relation to CoCr?
- Cheaper
- Easier to add to
3 disadvantages of acrylic in relation to CoCr?
- Less well tolerated
- More damaging to the periodontium
- Weaker
- Bulky
Why do we use a buccal bar?
Lingually tilted teeth
A major connector for Kennedy class 2 in the maxilla?
Posterior palatal bar
Why would you choose a lingual plate over a lingual bar major connector?
- Becuase there isn’t enough space for a lingual bar as we need at least 8mm clearance for a lingual bar
Why we must use the surveyor and design the denture before taking master impressions?
- Because we might need to adjust the teeth for the design such as
cutting rest seats and guideplanes
adding undercuts with composite
What problems are with teeth circled relating to designing a partial denture?
- Teeth are lingually tilted meaning undercuts are lingual not buccal
- meaning that clasp arms will engage lingually
List dow different materials need different undercuts?
- CoCr - 0.25 mm
- Gold - 0.5 mm
- SS - 0.75 mm
5 characteristics of clasps?
- Engage undercuts
- Flexibility - the longer the more flexible
- Reciprocation
- Aesthetic
-
What is indirect retention?
- Resistance of the denture to rotational displacement
What is the best type of support and retention?
Quadrilateral opposed rests and clasps
What is bracing ?
Resistance to horizontal movement
