PROSTHODONTICS & OCCLUSION Flashcards
Define the following denture terms
Saddle Abutment Teeth Pontic Flange Retainer Connector Occlusal Rest
Saddle - space in the arch where teeth are missing and will be replaced - edentulous areas
Abutment Teeth - teeth adjacent to the saddle, teeth that will have retainers
Pontic - artificial/denture teeth
Flange - the acrylic component that is replacing soft tissue
Retainer - clasps on abutment or other supporting teeth
Connector - major and minor components which connect the denture to smaller components and/or itself
Occlusal Rest - denture component that is placed on occlusal surfaces to resist forces towards the gingiva
What steps do you need to take in clinically making a denture?
Primary impressions
Facebow and MMR
Complete any other dental treatment needed
Secondary impressions (with special tray)
Facebow, MMR and tooth shade selection
Wax rim try in
Primary denture issue
Secondary denture issue (if adjustments needed to be made based on primary)
A patient attends your clinic and is missing teeth 14-22
What would be the kennedy classification of this denture
Kennedy class IV
Describe a Kennedy class II
Kennedy class two is a unilateral edentulous area posterior to the remaining teeth
A patient attends the clinic with the following teeth missing;
(NB; 37 present)
36, 35, 44, 45, 46, 47
What would be the kennedy classification of this denture
Kennedy class II modification I
The most posterior saddle is in Q4 as all posterior teeth are missing, and there is only one additional saddle in Q3 –> 1 modification
Which of the following statements is correct;
A. You can have a modification on Kennedy class IV B. If there is only one tooth missing, there is no kennedy classification C. Kennedy class III is a unilateral edentulous area bounded by natural teeth D. If you have a bilateral edentulous area posterior to remaining teeth this is a Kennedy class II
C is correct
What are some of the pros and cons of a CoCR denture
Pro’s
Strong, less bulky than acrylic, fracture resistance, tooth support with occlusal rests
Con’s
High thermal conductivity, complex and more expensive to make, difficult to repair
Which of the following statements is incorrect
A. The setting reaction of gypsum is hemihydrate –> dihydrate
B. The setting reaction of gypsum is an exothermic reaction
C. Die stone is the most dense material relative to plaster and stone
D. If you add more water to your mix the setting time is faster and the material is weaker
D - partially correct, more water:powder will result in a weaker cast BUT this will slow the setting time rather than increasing it
Discuss why you would need a clean bowl and spatula when mixing gypsum
Any gypsum slurry or set gympsum remaining in the bowel/on the spatula provides nucleation sites for the new mix and will therefore speed up the setting reaction
Also infection control
Which of the following materials is NOT an elastic material
A. Alginate
B. Polyether
C. Agar
D. Wax
D - wax in a non-elastic material
Differentiate between the mucostatic and mucocompressive impression techniques
Mucostatic
- An impression recording the undisplaced mucosa, retention without load is excellent but distribution to tissues under load may be uneven
Mucocompressive
- An impression recording the mucosa under load. Even distribution under load but fit when not under load may be compromised
What is the chemical formula of alginate
CaSO4 + 2H2O + Na-Alginate
The calcium, sulfate and alginate salt (alginate-Na) are all soluble in water
calcium binds to alginate to move the reaction from a sol–>gel
retarders are added to preferentially bind the calcium to slow the setting reaction
What is the chemical formula of Gypsum
Di-Hydrate - CaSO4+2H2O (stone)
Hemi-Hydrate - CaSO4+1/2H2O (powder)
What is the official definition of occlusion
From Pros Lectures:
The static relationship between the incising masticating surfaces of maxillary or mandibular teeth or tooth analogues
From Occlusion Lectures:
Occlusion is the dynamic, biological relationship of the teeth, jaw muscles and TMJ that determines tooth contact relationships for function
Which of the following are the correct measurements of the condyle
A. lateral-medial 20mm, anterior-posterior 15mm
B. lateral-medial 15mm, anterior-posterior 20mm
C. lateral-medial 10mm, anterior-posterior 15mm
D. lateral-medial 15mm, anterior-posterior 15mm
A
I know this a pain in the ass Q but he mentioned we NEED to know these average values