PRELIM: FPD Flashcards
Factors that contribute to further irritation and demise of abutment tooth
App of irritating med Poorly fitted Poorly cemented App of hot Indiscriminate Trauma from Trauma from forces Irritation from acid Hydraulic pressure gen during cementation
Other factors which ABUSE the Tooth
BOBTA
How to reduce the ODDS of inducing IRREVERSIBLE DAMAGE to the Abt
- Avoid drugs/meds that may do more harm than benefit
- Repairing and recontouring the abt tth with non irr and adhesive resto matls
- Prov well fitting protec covering
- Recog the factors that contribute to pain or discomfort
Pain may be caused by
Leakage in the protective covering
Hydraulic pressure engendered during cementation
High occ
Biophysical factors rel to FP
Acc of fit Resist to deformation Int surface texture Length of bridge span Design of fixed prosthesis
Basic rules for a cantilever fpd
Should only have Single pontic Abt retainer should only be full crowns 2 or more abts Good root and crown length and perio con Pontic should be slightly smaller
Principles of tooth prep
Pres of tooth structure Ret resis Struc durability Marginal integrity Pres of the periodontium
Against removal along path of insertion or log axis of the tth prep
Retention
Against dislodgement by forces in apical or oblique
Resistance
2 elements of retention
Ext
Int
External (ret)
BuLi of prep tth
Int (ret)
BuLi walls of a prox box of inlay
Recommended taper
3-5
Taper for both walls
6-10
An imag line wc resto is placed onto or removed from the prep
Path of insertion
A resto must contain bulk of matl
Struc durability
Gold
Fxn
Non fxnal
- 5 fxn
1. 0 nonfxnal
pfmc
Fxn
Nonfxnal
1.5-2 fnx
1-1.5 nonfxn
Fxnal cusp bevel
Upper -
Lower -
Upper - Li
Lower - bu
Margin of veneer
Chamfer
All ceramic margin
Shoulder
Inlays onlays
Shoulder bevel
Bulk axial reduc and shoulder prep
Flat ended tapered
Depth grooves bur
Round diamond
Lingual reduc bur
Oblong football
Bur for bevel
Tapered oblong or flame
Bur chamfer for molars
Straight cylinder with tapered pt
Bur for axial and occ reduc
Round ended tapered diamond cylinder
Bur for gross reduction, ant li reduc
Round diamond wheels
Bur for prox slices to remove contact
Thin tapered diamond cones (needle)
Bur for groove placement
Cross cut fissure bur
Indications of FPD
Short span es
Px preference
Presence of spund tth that can offer suff support adj to the es
Cases pf ridge resorption where and rpd cannot be stable
Mentally compromised or physically handicapped px who cant maintain an rpd
Contraix of fpd
Very yound pxs with large pulp chambers Large amt of bone loss as in trauma Long span es Very old pxs Mentally compromised pxs
Types of retainer accdg to tth coverage
Fvc
Pvc
Conservative - maryland, fiber reinforced fpd
Types of retainer accdg to matl
All metal
Metal/cer
All cer
All acrylic
Economically best type of crown for ant and post
Metal ceramic crowns
Least conservative crown
All ceramic
Ideal req for pontics
Shld restore fnx of tth Provide good esthetics Comfortable to pxs Biocompatible Permit eff oh, easy to clean Preserve mucosa and bobe
Indications of cantilever fpd
Es and psych cons
To avoiduse of rpd
To avoidthe acutting and prep of tth across the span
Occ to provide a housing for an att
Indications for fpd
SP-CP-M
Types of retainer accdg to tooth coverage
Pvc
Fvc
Conservative - maryland/fiberreinforced
Types of ret accdg to MATERIAL
All metal
Metal/cer
All cer
All acrylic
Criteria for selecting type of retainer
Appearance Alignment of abt Cond of abt Cost Preser of ts
