PROSTHETIC DENTISTRY Flashcards
It refers to the saturation of hue
Chroma
The face-bow is used to record
Relation of the maxilla to the TMJ
This is the primary stress-bearing area of the mandibular edentulous jaw and should always be covered by the denture base
Buccal shelf
A dentist primarily splints adjacent abutment teeth in a fixed partial denture in order to:
Improve the distribution of the occlusal load.
To disinfect casts, it can be immersed in a solution of sodium hypochlorite for ___ or disinfected with iodophor spray.
30 minutes.
901 bur is known as
End cutting
Which of the following will retard the setting time of polyvinyl siloxane
Sulfur in latex
Which of the following adverse conditions may arise if occlusal vertical dimension is increased.
The closing muscles may become strained.
A type of articulator wherein the condylar elements are on the lower member of the articulator, while the mechanical fossae are placed on the upper member.
Class III arcon articulator
Reversible hydrocolloids exhibit the property of transformation from sol to gel and gel to sol as a function of the ___.
Temperature
In arranging teeth for balanced occlusion, increasing the incisal guidance.
Increase the compensating curve.
When disinfecting an alginate impression, it should be rinsed and disinfected with ___ before pouring.
Glutaraldehyde or Iodophor
The cast-wrought combination clasp is desirable
Because of its ability to flex in all directions.
ADA specification number of inlay wax.
4
It is the filter content of alginate or irreversible hydrocolloids.
Silica
Flexible dentures are made of:
Nylon
F,V or PH are classified as __ sounds
Labiodental
In the oral examination of a complete denture patient, why should the saliva be evaluated?
-A thin watery saliva does not afford lubricating protection for the mucosa
-A thick ropy saliva interferes with obtaining an adequate impression.
-Xerostomia hinders adhesion and produces poor retention.
Resistance of a denture to movement on its tissue foundation, especially to lateral or horizontal forces. This is a definition of:
Stability
Three weeks after insertion of a fixed bridge, marked discomfort to heat and cold. The most likely cause is:
Deflective occlusal contact
When setting maxillary anterior teeth for complete dentures, the ideal location of the artificial teeth is:
Anterior to the ridge
These materials are also known as light-cured glass ionomer cements.
RMGI
The phenomenon where porcelain appears different under varying light condition is:
Metamerism
Guide plane are created:
Before rest seat preparation.
This is a fluoride-releasing cement that is also considered as the first tooth-colored restoration.
Silicate cement
A supporting element of an RPD framework that prevents the vertical displacement of the denture in a gingival direction.
Rests.
After a patient moves his mandible in a right lateral excursion movement, the non-working condyle will move
Downward, forward and medial
Dental plaster differ from dental stone primarily in __.
Physical nature of the particles
Excessive vertical dimension may result to which of the following?
Excessive trauma to the underlying tissues
If one is fabricating 2 casted restorations, what would be the difference if one is made up of base metal alloy, while the other is made up of noble metal alloy?
Noble alloys do not oxidize on casting
Polymer monomer ratio by volume.
3:1
Bilabial sounds are __.
B,P,M
The most dimensionally stable impression material is:
A-silicones
It refers to the attraction of different molecules of different substances.
Adhesion
The posterior occlusal plane is determined on an occlusion rim by paralleling the rim with the
Ala-tragus plane
When utilizing a facebow, which among the landmarks is being used as a guide?
Nasion
A dentist has removed all of the teeth of a 60-year-old patient. He should except that the maxillary bone would resorb in which of the following directions?
Superior, posterior and inward.
Proper lip support for a patient with complete dentures is provided primarily by the:
Facial surfaces of teeth and simulated attached gingiva.
In order to compensate for the contraction of gold alloy, dental investment make use of?
-Hygroscopic expansion
-Setting expansion
-Thermal expansion
Beading in major connectors main function is to:
Maintain tissue contact of the RPD framework.
Tissue hyperplasia caused by chronic irritation of overextended borders of the denture is referred to as?
Epulis fissuratum
Best explain why the dentist should provide a postpalatal seal in a complete maxillary denture? The seal will compensate for:
Polymerization and cooling shrinkage
Record used to be able to identify condylar inclination which can be used in adjusting condylar guidance in a semi-adjustable articulator.
Protrusive record
Linguodental sounds
T and D
The amount of gingival to occlusal divergence for an unusually short vertical wall is ideally.
Maximum of 2 degrees
A type of impression technique used for patients with flabby tissues allowing the clinician to record the movable tissue in its passive position.
Selective pressure
Non-rigid connector may be used in fixed bridges in those cases involving:
Short span bridges replacing one missing tooth where the prepared abutment teeth are not in parallel alignment.
Impression materials is the most rigid and, therefore the most difficult to remove from the mouth.
Polyether
What is the proper disinfection of most rubber impression materials?
10 minutes immersion in 2% glutaraldehyde.
It is the very first elastomeric impression material
Polysulfide
The smear layer is an important consideration in:
Dentin Bonding
In cobalt-chromium alloys, the constituent responsible for corrosion resistance is:
Chromium
During the casting process oxidation may happen if the molten metal is overheated using a torch flame. This may liberate ___ compounds forming a black casting.
Sulphur
Porcelain bonded to metal is strongest when it is:
Under compression.
Absence of shrinkage of impression after curing refers to what property of the material?
Dimensional stability
It is a space in between the maxillary and mandibular posterior teeth during protrusive movements.
Christensen’s phenomenon
It is defined as the growth of crystalline structures within the glass or its surface.
Devitrification
Correctly describes the proximal plate.
It must be extended vertically about 2/3 of the length of the crown from the cervical to the marginal ridge.
Adding carbon to chromium-cobalt alloy has effect on it’s:
Strength
In metal-ceramic restoration, fracture of the restoration usually occurs where?
In the porcelain
For a tilted abutment that will be prepared for fixed bridges and has a tendency to have pulpal exposure during preparation. The best pre-operative treatment is to:
Do orthodontic treatment
how much tooth structure should be reduced in the working cusps when fabricating gold crown restorations?
1.5mm
When preparing a maxillary first molar that will receive a metal-ceramic crown, the functional cusp bevel must be place on?
Lingual
If you add Potassium sulfate in gypsum, it will result to?
Decrease setting time
The least desirable type of all major connectors used in maxillary arch when constructing a RPD framework.
Anterior U-shape
Substance porosity of the casting is due to what type of sprue?
Short
The type of stress which dental amalgam is most resistant?
Compressive
In determining the posterior limit of a maxillary denture base, which of the following is on the most posterior border?
Hamular notch
Refractory skeleton that provides strength and hardness during firing.
Quartz
It is an anteroposterior curve formed by the incisal edges of the anterior teeth and the buccal cusps of the mandibular posterior teeth.
Curve of Spee
A pontic design which is ideally used in anterior segment of the arch.
Modified ridge lap
It refers to the rapid cooling of a metal to alter its molecular structure resulting to increase hardness or resistance to deformation after a heat treatment.
Quenching
Component of traditional dental porcelain responsible for its translucency.
Feldspar
Type of expansion seen in a 30 minute, 35 degree celsius hydrobath of the investment ring before nurn-out process.
Hygroscopic expansion
After extraction and healing, the maxillary denture-bearing area discloses bony undercuts in both tuberosity areas. The best treatment for this is ____.
Surgically reduce the undercuts just enough to allow path of insertion.
Maxillary incisal plane should be parallel to which of the following when constructing a complete denture
Interpupillary line
What is true about carbide burs?
Less flutes mean it has more cutting efficiency.
A line connecting the tragus to ala of the nose is known as?
Camper’s
Best finish line for cast gold restoration.
Chamfer
When evaluating a patient that will receive an RPD framework, which of the following must be taken into consideration?
Condition of the ridge
For posterior abutments with acceptable crown-root ratios, average crown length and normal esthetic requirements,the retainer of choice is a __.
Partial veneer crown
The component of a fixed partial denture that attaches abutment to the suspended unit
Retainer
It is a white clay-like material that acts as a binder and gives opacity to the mass.
Kaolin
Procedure done to adapt malleable metal restoration to the tooth in order to close any gaps between the restoration and tooth margins.
Burnishing
The component of the polysulfide impression material which causes brown color, stains and foul odor.
Lead dioxide
A whistling sound with dentures is indicative of ___.
Too narrow or too high posterior dental arch form.
When handling impression materials that are new to you, it is best to:
Follow the instructions of the manufacturer.
The superior border of the lingual bar must have a minimum of ___ distance from the gingival margins
4mm
Addition of this makes the most effective way in strengthening gold alloys.
Copper
A two-stage impression technique may be considered for partial denture construction primarily because?
Resilient and non-resilient tissues are involved.
It is also known as a saddle type of pontic design
Ridge flap
What teeth is the least desirable to use as an abutment tooth for an FPD?
Tooth with short, tapered root with long clinical crown.
Silicate cement restorations are subject to dehydration throughout their lifetime. Therefore, they must be coated by __ to prevent this.
Varnish
Exhibits a wheelbarrow type of lever
Class 2 (second order lever)
A very thick palatal denture base will primarily affect?
Phonetics
The anteroposterior curvature and the mediolateral curvature in the alignment of the occluding surfaces and incisal edges of artificial teeth that are used to develop balanced occlusion is called:
Compensating curve
Feldspathic porcelain is composed primarily by the oxides of the following:
-Silicon
-Aluminum
-Feldspar
Best describes the RULE of BULL.
It is the selective grinding of interferences in the working-side movements of the buccal cusp inner inclines of upper teeth and lingual cusp inner inclines of the lower teeth.
It is defined as the bilateral, simultaneous contact of anterior and posterior teeth during centric and eccentric positions.
Balanced occlusion
Impression materials has the greatest tear strength.
Polysulfide
