35. Prostho II (RPD/FPD) Flashcards
Class I kennedy
Bilateral distal ext
Class II kennedy
Unilateral distal extension
Class III kennedy
Tooth bound / Bounded
Class IV kennedy
Anterior crossing midline
BQ: Kennedy classification WITHOUT MODIFICATION
Class IV
BQ: “Combination Syndrome”
- combination of 2 dentures (CD/RPD)
- excessive resorption in the ant region of maxilla
Kelly syndrome
Most common MANDIBULAR major connector
Lingual bar
Lingual bar
Relief =
Ideal thickness =
Lingual bar
Relief = 4mm
Ideal thickness = 5mm
Aka “Kennedy blanket”
Lingual plate
Indications for Lingual plate: (no relief)
High frenal att
Excessive distal ext case
“modified lingual plate”
Adv: lighter than lingual plate bec reduced metal
Disadv: food impaction spaces
Kennedy bar or Continuous bar
BQ: Labial bar is aka:
“Swing lock” major connector
Relief in the MAXILLARY
6mm relief
BQ: Maximum thickness of palatal strap
8mm thickness
APPC / Ant-Post Palatal Connector Window = Post strap = Middle strap = Ant stap =
APPC / Ant-Post Palatal Connector Window = > 15mm Post strap = 5-7mm Middle strap = 7-9mm Ant stap = 8-10mm
Major conn for extensive distal ext case in mandibular
Lingual plate
Major conn for extensive distal ext case in maxilla
Palatal plate
Major conn used for Class IV, Torus palatinus, deep palatal curve
U shape / Horse shoe
Major connector: Rigid or Flexible?
Rigid
BQ: Minor connector: Rigid or flexible?
Rigid
Connects all the remaining components of the RPD to the major connector
Minor connector
Prevents RPD from moving away from the hard tissues
Direct retainers
“Key and key way”; Direct retainer located WITHIN the contours of the crown
Intracoronal direct retainer
Retentive arm from ABOVE height of contour
Suprabulge
Most common direct retainer
Simple akers or “circlet clasp”
Example of Suprabulge Extracoronal direct retainer
Circumferential clasp (simple akers/circlet clasp)
Retentive arm BELOW height of contour
Infrabulge
Example of Infrabulge
Bar clasps or “ROACH clasp”
- I bar or RPI
BQ: best finish line
A. Supra
B. Equi
C. Sub
Supragingival
FUNCTION over Esthetics
BQ: Ideal location of “Terminal retentive 3rd” or “Flexible 3rd” of the Retentive Arm?
Gingival 3rd
Thickness of terminal/flexible 3rd
0.5mm - 1mm
Thickness of semi rigid (ret arm)
1.5mm
Thickness of RIGID (ret arm)
2mm
Provides STABILITY (bracing); counteracts retentive arm to prevent lingual inclination
Reciprocal arm
Ideal location of Reciprocal arm
Junc of ging 3rd and middle 3rd
Component of direct retainer for SUPPORT
Rest
Rest on maxillary canines
Cingulum rest
Rest on mandibular canines
Incisal rest
BQ: What component of RPI provides bracing / reciprocation?
Proximal plate
BQ: What is the minimum encirclement of a retentive clasp assembly?
180 degrees
BQ: Property of a direct retainer wherein it doesn’t exert force when the denture is seated in place
Passivity
Prevents distal extension from moving away from the underlying tissue during function;
- prevents SEE SAW movt
- used for additional retention (rests; plates)
Indirect retainers
Provide positive stop of the framework; mn only
Tissue stops
<90 degrees; finish line created during wax up
External finish line
BQ: specific concentration of cobalt and chromium in cobalt-chromium
Wala pang answer
Most malleable (hammer into thin sheets) and most ductile (ability to form shapes) metal
Gold (ada spec #5)
Metal that is corrosion resistant
Chromium
Primary retention form of Fixed prosthesis (4)
Height
Taper
Grooves
Cements
Most impt factor that determines retention form of fixed prosthesis
Height of walls
Ideal taper for fixed prosthesis
2-5 ✅
Pag wala:
3-6
6-10
More parallel
Increase taper
Retention:
Line of draw:
Increase taper
Retention: Decrease
Line of draw: increase
***vice versa
BQ: bevel of Occ CSM of Gold
40 degrees
All CSM of GOLD are bevelled at 40 degrees except
Gingival CSM and Counterbevel (onlay) at 30 degrees
BQ: True or False. 40 degree CSM bevel if restoring porcelain inlays
False
Porcelain and Composite have No cavosurface bevel in what surface
No OCCLUSAL cavosurface bevel
BQ: surface area of the roots of the abtmnt tth should be EQUAL or GREATER THAN the surface area of roots of the teeth to be replaced
Ante’s law
BQ: Biologic width =
2.04mm from base of sulcus to alveolar crest
JE = 0.97mm CTA= 1.07mm
BQ: Best crown root ratio
1:2
BQ: MINIMUM crown root ration
1:1
BQ: MOST COMMONly encountered crown root ratio
2:3
Fxnal or working cusp of Upper
Upper = Lingual
Fxnal cusp of Lower
Lower = Buccal
Occ reduction: AMALGAM
Working cusp:
Non working cusp:
Occ reduction: AMALGAM
Working cusp: 2.5mm
Non working cusp: 2mm
Occ reduction: PORCELAIN
Working cusp:
Non working cusp:
Occ reduction: PORCELAIN
Working cusp: 1.5mm
Non working cusp: 1.5mm
Occ reduction: PFM
Working cusp:
Non working cusp:
Occ reduction: PFM
Working cusp: 2.0
Non working cusp: 2.0
Occ reduction: GOLD/METAL
Working cusp:
Non working cusp:
Occ reduction: GOLD/METAL
Working cusp: 1.5mm
Non working cusp: 1.0mm
BQ: Thickness of metal in PFM
0.3-0.5mm
BQ: Mesial half crown preserves
DISTAL surface
BQ: Distal half crown preserves
Mesial surface
3/4 crown preserves what surface?
Facial surface (3/4)
7/8 crown preserves what surface?
MBu surface (7/8)
Reverse 3/4 crown preserves what surface?
Lingual surface (reverse 3/4)
BQ: Most common tooth for 3/4 and reverse 3/4
Mandibular molars
All fpds are contraindicated to
Poor hygiene
High caries rate
BQ: In restoring #16 using GOLD crown; How many is the reduction in the LINGUAL cusp?
Fxn (Li) = 1.5mm
Facial and Lingual reduction of FULL veneer crowns
1.25mm to 1.5mm
Proximal reduction in FULL veneer crowns
1.25mm
Resist dislodgement of the crown in VERTICAL direction
Retention
Resists LATERAL forces
Resistance
BQ: Which is more impt:
A. Resistance
B. Retention
C. Same
Resistance
BQ: Sliding fit finish line
Feather edge or knife edge
Go for CHAMFER if wala sa choices
How long will you place retraction cord
5-10mins
Most common soln used in soaking retraction cords
Epinephrine (0.8%)
Soln used in retraction cords if px is contraindicated to epinephrine
Potassium aluminum sulfate
Antibacterial; causes tissue necrosis
Aluminum chloride (5-10%)
Good hemostatic agent; discolors the tissue
Also used in Iron def anemia: tooth discoloration
Ferric sulfate (13.3%)
BQ: Pag hindi naging effective yung pag lagay mo ng retraction cord; What’s the next thing to do?
Electrocautery
1st cord - control moisture
2nd cord - actual retraction
Double cord technique
Most hygienic pontic; but POOR esthetics (concave)
Sanitary
Esthetically good but not hygienic
Ridge lap
Similar to sanitary but shaped like a bullet (convex)
Bullet
Ridge lap on buccal and bullet on lingual
Modified ridge lap
Most esthetic, looks as if it is growing out of the gingiva; but difficult to clean
- RIDGE AUGMENTATION or GTR
Ovate
Rest on maxillary canines
Cingulum rest
Rest on mandibular canines
Incisal rest
BQ: What component of RPI provides bracing / reciprocation?
Proximal plate
BQ: What is the minimum encirclement of a retentive clasp assembly?
180 degrees
BQ: Property of a direct retainer wherein it doesn’t exert force when the denture is seated in place
Passivity
Prevents distal extension from moving away from the underlying tissue during function;
- prevents SEE SAW movt
- used for additional retention (rests; plates)
Indirect retainers
Provide positive stop of the framework; mn only
Tissue stops
<90 degrees; finish line created during wax up
External finish line
BQ: specific concentration of cobalt and chromium in cobalt-chromium
Wala pang answer
Most malleable (hammer into thin sheets) and most ductile (ability to form shapes) metal
Gold (ada spec #5)
Metal that is corrosion resistant
Chromium
Primary retention form of Fixed prosthesis (4)
Height
Taper
Grooves
Cements
Most impt factor that determines retention form of fixed prosthesis
Height of walls
