Ass Flashcards
- Management of short teeth:
Preparation with least occlusal taper.
• Extension of preparation subgingivally.
• Using retainers with metal occlusal surface.
• Preparation with retentive grooves
- Information obtained from mounted study casts
analysis:
- Number, Distribution and Dimensions of Edentulous Span.
- Occlusal Analysis.
- The Occlusal Discrepancies and the Need to Establish a New Occlusal Plane
- Changes in Teeth Axial Inclination for a Common Path of Insertion
- Abutment Teeth Form, Size and Mal-position.
- Planning for Suitable Bridge Design.
- Tooth Preparing and Waxing prior Initiating the Treatment.
- characteristic features as seen through radiograph of the pulp
- Dentinogenises imperfect
- Pulp stones
- Internal resorption
- Dens indenta
- Factors affecting C/R ratio:
- Alveolar bone level
- Attrition of occlusal surface.
- Reduction of root length
- Abnormal root form
- Define Periodontal ligament area (Ant’s law):
sum of periodontal ligaments surface area of the abutments teeth should be equal
to or exceed the total periodontal ligament area of tooth or teeth to be replaced.
- Factors modifying Ant’s law:
- Well motivated patients and highly proficient in plaque control
- Opposing occlusion (sound natural dentition or artificial removable prosthesis)
- Decreased in mesiodistal length of edentulous span due to bodily movement
of teeth
- Narrow periodontal ligament space caused by:
anklyosis.
b. Marble bone disease.
c. Paget’s disease.
d. Orthodontic treatment– uneven thickness
- Wide periodontal ligaments:
a. Over function.
b. Root external resorption.
c. Loss of lamina dura in diabetic patient
- Resin bonded tooth supported fixed partial denture: Indications:
1) Caries free abutment teeth.
2) Maxillary and Mandibular incisors replacements.
3) Single posterior tooth replacement.
4) Young patient with favorable occlusion.
- Correction of overerupted opposing tooth:
- Orthodontic repositioning.
- Simple contouring of plunger cusp and topical application of fluoride.
- Occlusal veneers or Onlay.
- Crowning of over-erupted tooth.
- Endodontic treatment and crowning of overerupted tooth.
- Extraction.
- Factors affecting the selection of prosthesis type:
- Biomechanical considerations.
- The prospective abutment.
- Esthetic requirements.
- The patient desires.
- Financial factors.
- Clinical skills.
- Laboratory support.
- Clinical sequels of bridge bending:
- Fracture of porcelain veneers.
- Connectors breakage.
- Retainer loosening.
- Unfavorable soft tissue response.
- How to overcome bridge bending case question :
Pontics with greater occ.gingival dimension.
Alloy of high modulus of elasticity.
Increase retention form in preparation.
Connecters should be as bulky as much possible.
Use of double abutments
Alternative treatment modalities for long span edentulous area:
Implant supported F.P.D R.P.d
- Information concerning the proposed abutments:
- Pulp condition
- Coronal variation & teeth alignment
- Root portion & periodontal condition
- Occlusion
- Mesially Tilted teeth management :
- upright the tilted tooth orthodontically
- Proximal half crown
- Non-rigid connector
- Telescopic crown
- The endodontically treated tooth require restoration because of several factors:
- Dehydration of dentin of endodontically treated teeth will result in decrease
in the strength and toughness 14% - structural integrity is lost because of caries, trauma and access cavity
preparation - neurosensory feedback mechanism is impaired with the removal of the pulpal
tissue
- What are the factors to be considered while planning the final restoration?
⬥ Amount of remaining sound tooth structure
⬥ Opposing dentition
⬥ Position of the tooth in the arch
⬥ Length, width and curvature of the roots
- INDICATIONS OF POST:
- Badly destructed endodontically treated anterior and posterior teeth.
- Endodontically treated teeth with biologically sound root (no resoption, no
fracture) - Endodontically treated teeth with long, thick and strong root.
- Endodontically treated teeth without any periapical pathosis.
- Endodontically treated teeth with healthy periodontal and alveolar support.
- FACTORS TO BE CONSIDERED IN POST SELECTION
- Post length.
- Post diameter.
- Post design.
- Indication of custom made post:
• Non circular cross section.
• Extremely tapered.
• Very wide canal.
• Considerable amount of tooth structure have been lost.
- Six feature of successful design:
:
1. Adequate apical seal.
2. Minimum canal enlargement.
3. Adequate post length.
4. Positive horizontal stop ( decrease wedging )
5. Vertical wall to prevent rotation.
6. Extension of the final restoration margin to the sound.
- Define ferrule :
is the circumferential ring of sound tooth structure, that is enveloped by the
cervical portion of the crown restoration.
- Mechanical Methods Of Fluid Control:
:
A. Rubber dam.
B. Suction devices:
1- High volume Vacuum.
2- Saliva ejector.
3- Svedopter.
C. Cotton rolls.
- Advantages of High Volume Suction:
:
• Helps in removing small debris during crown preparation
. • Good lip :
• Helps in removing small debris during crown preparation
. • Good lip retractor.
• Reduce splatter with ideal aspiration.
• increase access and visibility.
- Indication For Tissue Dilation:
- During diagnosis
- During tooth preparation
- During impression taking
- During try in
- During cementation
- Double cord technique:
:
- Impression of multiple prepared teeth
- Impression for compromised tissue health
- There are five techniques:
:
- Single mix impression technique.
- Double mix impression technique.
- Putty and wash impression technique.
- Automix impression technique.
- An optical impression technique
