Interim FDP Fabrication #3-5 Flashcards
What are the available materials for provisional #3-5 bridge?
- Acrylic Resins:
- PMMA
- Bis-Acryl Composites
- Chemical Activated
- Visible Light Activated
- Dual Activated
What are the advantages and disadvantages of PMMA Acrylic Resins?
- Advantages:
- can be relined and repaired
- Disadvantages:
- exothermic reaction
- High degree of shrinkage (8%)
What are the advantages and disadvantages of Bis-Acryl Composites?
- Advantages:
- less shrinkage
- minimal heat generated during setting
- use auto mix for delivery
- Disadvantages:
- More brittle than acrylics
- difficult to reline
Connector Design Requirements: Height vs width
- Minimum Height: 3-4mm
- Minimum Width: 3-4 mm
Connector Design: Cross Section Shape
What are the different Pontic design for FDP?
- Hygienic
- Conical
- Saddle/Ridge-Lap
- Modified Ridge-Lap
- Ovate
Pontic Design: Biologic Factors
- Cleansable tissue surface
- Access to Abutment teeth
- No pressure on ridge
Pontic Design: Mechanical Factors
- Rigid
- (resist deformation)
- Strong Connectors
- (prevent fracture)
- Metal-ceramic framework
- (resist porcelain fracture)
Pontic Design: Esthetic factors
- Shaped like tooth it replaces
- Appears to “grow” out of edentulous ridge
- Sufficient space for porcelain
Hygienic Pontic:
- aka Sanitary Pontic
- no contact with ridge
- 2-3mm space b/w ridge & Pontic
- adequate space for hygiene w/o food trapping
- used in non-aesthetic areas
- posterior mandible
- convex in all directions
- m/d follow ridge contour
Conical Pontic
- Passive contact w/ridge crest
- rounded and cleansable
- Triangular embrasures may trap debris
- suited for thin mandibular ridges
- non-esthetic regions
Ridge Lap Pontic
- DO NOT USE
- Forms a large concave contact w/ridge
- non-cleansable
- tissue inflammatio
Modified Ridge Lap Pontic
- Passive contact Facial to ridge crest
- Convex tissue surface
- used in esthetic zone
Ovate Pontic
-
Highly Esthetic
- Blunt rounded Pontic tip set into concavity in the ridge
- Requires pre-prosthetic surgery
- Maintains pressure on gingiva to mold tissue and interdental papillae
- Cleansable by motivated patients
- Pontic appears to be “growing” from ridge
- eliminates the potential for unsupported porcelain in cervical portion of anterior Pontic
- compared to modified ridge-lap
Overview Table for Pontic Design:
- Recommended location
- Advantages
- Disadvantages
- Indications
- Contraindications
- Materials used
What is the recommended location for hygienic Pontic?
Posterior Mandible
Advantages & Disadvantages of Hygienic Pontic
- Hygienic:
- Good access for oral hygiene
- Disadvantage:
- Poor esthetics
Indications and Contraindications for Hygienic Pontic
- Indications:
- Nonesthetic zones
- impaired oral hygiene
- Contraindications:
- Where esthetics are important
- minimal vertical dimension
What materials are used in hygienic Pontic?
- All Metal
What is the recommended location for Saddle/Ridge-Lap Pontic?
Not recommended
What are the advantages and disadvantages of Saddle/Ridge-Lap Pontic?
- Advantages:
- esthetic
- Disadvantage:
- not good for oral hygiene
What are the indications and contraindications for Saddle/Ridge-Lap Pontic?
Not recommended
What materials are used in Saddle/Ridge-Lap Pontic?
none
What is the recommended location for conical Pontic?
- Molars w/o esthetic requirement
What are the advantages and disadvantages of conical Pontic?
- Advantages:
- good access for oral hygiene
- Disadvantage
- Poor esthetics
What are the indications and contraindications for conical Pontic?
- Indications:
- posterior areas where esthetics is minimal concern
- Contraindications:
- poor oral hygiene
What materials are used in conical poetics?
- Metal Ceramic
- all ceramic
- all resin
What is the recommended location for modified ridge-lap Pontic?
- high esthetic requirement
- anterior teeth
- premolars
- some maxillary molars
What are the advantages and disadvantages of modified ridge-lap Pontic?
- Advantages:
- good esthetics
- disadvantages:
- moderately easy to clean
What are the indications and contraindications for modified ridge-lap Pontic?
- Indications:
- most areas w/esthetic concern
- Contraindications:
- minimal esthetic concern
what materials are used in modified ridge-lap Pontic?
Metal Ceramic
All porcelain
All resin
What is the recommended location for ovate Pontic?
- Very high esthetic requirement
- maxillary incisors, canines, premolars
What are the advantages and disadvantages of ovate Pontic?
- Advantages:
- superior esthetics
- negligible food entrapment
- ease of cleaning
- disadvantages:
- requires surgical prep
- can’t use for residual ridge defects
What are the indications and contraindications for ovate Pontic?
- Indications:
- Desire for optimal/best esthetics
- high smile line
- Contraindications:
- doesn’t want to do surgery
- residual ridge defects
What materials are used in ovate Pontic?
Metal Ceramic
All porcelain
All resin
