Prosth Flashcards
What property limits the number of times a base metal clasp arm can be adjusted?
elongation
In a maxillary RPD, the minimum distance between the major connector and the FGM is?
6 mm
in a mandibular RPD, the minimum distance between the major connector and the FGM is?
3 mm
in a mandibular RPD, the minimum distance between the floor of the mouth and the FGM is?
6-8 mm
Where should the retentive clasp arm tip engage the tooth?
in the undercut
Where is the undercut commonly located on a tooth?
the junction of the middle and cervical third
What is the function of flux in soldering?
essentially to clean the areas of the metal to be soldered/remove oxides/prevent oxidation so that the joint is strong and durable
What is flexural strength?
the ability of a material to bend without fracturing
Zinc oxide eugenol contains ___ which is ___ to the pulp and ____ the risk of pulpal irritation.
Eugenol, soothing, decreases
Zinc phosphate cement contains ___ which is ___ to the pulp and ____ the risk of plural irritation.
phosphoric acid, irritating, increases
The modulus of elasticity is ___ to the stiffness or rigidity.
directly proportional (more rigid = higher modulus of elasticity)
Brittle materials have ___ tensile strength and ___ compressive strength.
Low, high
Ductile materials have ___ tensile strength and ___ compressive strength.
High, low
Base metal alloys have a ___ melting point compared to high noble alloys.
higher
What is the Bennett angle?
Angle formed by the non-working condyle and the sagittal plane during lateral movements
What is the Bennett shift?
The lateral movement of the mandible towards the working side during lateral excursion.
What is the Bennett movement?
The right and left condylar motions caused by lateral movements of the mandible.
Where should the most labial position of a maxillary central incisor denture tooth be placed relative to the incisive papilla?
8-10 mm anterior
What is tensile strength?
the maximum stress a material can withstand while being stretched or pulled before failing
What is elastic modulus?
the ability of a material to resist permanent deformation
What is fracture toughness?
the ability of a material to resist crack propagation
What should the dimensions of an occlusal rest be?
- 1/3 B-L width of tooth
- 1.5 mm deep
- incline apically towards center of tooth
_____ release alcohol as a byproduct during the setting reaction.
Condensation silicones
What parts of an RPD should be flexible?
clasps
Define centric relation and the position of the condyles.
Condyles in the most anterior-superior position and disc interposed at its thinnest part
What impression material has the highest tear strength?
Polysulfide
Where should the thinnest portion of the wax pattern be placed in the ring?
the deepest part of the ring
What is the casting shrinkage of cobalt chromium?
2.2%
This is part of an artificial tooth that is only found on anterior porcelain teeth:
pin
