rbb Flashcards
(24 cards)
Why is it important to preserve partial group function when replacing #12?
To maintain the distribution of lateral forces between #13 and posterior teeth, avoiding overload on the #13 abutment.
What occlusal scheme does partial group function, typically present with?
Partial group function, where lateral forces are shared between canine and posterior teeth.
What are the prerequisites for a successful single-abutment cantilever?5x
Favorable occlusion, tall crown height for retention, good bone support, good C:R ratio and healthy periodontal condition.
What is an appropriate prosthesis design feature to resist dislodgement for #12 cantilever?
Incorporation of proximal grooves or slots on #13 for increased resistance form.
What connector design considerations are important for cantilever #12?
Adequate bulk to withstand masticatory force without compromising esthetics.
Should there be occlusal contact on pontic #12 in centric or excursion?
No—pontic should be free of occlusal contact to prevent overload.
When is implant better than cantilever for replacing #12?
When independent, long-term solution is preferred and bone availability is favorable.
Why is Maryland bridge #12 not suitable if pfm #11 present?
11 has a PFM crown- bonding of a Maryland bridge less reliable.
What occlusal challenges are associated with steep canine guidance?
Increased vertical and lateral forces on anterior teeth, risking overload on #13 abutment.
What is the first step in managing steep canine guidance with deep overbite?
Full diagnostic assessment using semi-adjustable articulator, facebow, and interocclusal record.
What should be evaluated radiographically in steep guidance cases?
Alveolar bone support, root health of #13, and potential skeletal discrepancy.
What is the purpose of splint therapy in deep overbite cases?
Protect against nocturnal parafunction and soft tissue trauma.
What is the purpose of diagnostic wax-up in treatment planning?
Visualize the final outcome, assess occlusion, and plan provisional restorations.
Why is increasing the OVD (occlusal vertical dimension) necessary in deep bite?
To alleviate palatal trauma and create restorative space for prosthesis.
What is the function of a provisional restoration at raised OVD?
To trial the new occlusal scheme and confirm function, comfort and esthetics.
What definitive materials are suitable for FDP in steep guidance?
PFM or zirconia (3Y or 4Y) for strength and durability.
What is the purpose of adding a cingulum stop on #13 in deep bite?
To provide stable occlusal contact and prevent deepening of the bite.
When is group function preferred in occlusal design?
When canine is compromised—spreads force across multiple teeth.
What is the role of selective occlusal adjustment in FDP design?
To harmonize guidance patterns and avoid interference with steep guidance.
What are advantages of dental implants in deep overbite cases?
Independent support, no impact on adjacent teeth, handles load effectively.
Why is RPD a last resort for missing #12?
Less esthetic, lower stability, and only chosen if fixed options aren’t viable.
What must be included in follow-up for prosthesis in steep guidance cases?
Check occlusal stability, periodontal health, restoration integrity, and compliance with night guard use.
What are the key elements for long-term success in complex prosthodontic cases?
Multidisciplinary planning, proper occlusal scheme, informed consent, and regular reviews.
Steps in mx of deep bite/steep canine guidance in replacement of #12
Stabilization phase = perio tx, splint therapy (U) -Michigan splint
Diagnostic wax up -to visualize inc in OVD[1-3mm]
Provisional restoration - trial new occl rshp for feedback prior to nxt step
Definitive restoration - material selection + occl consideration (stable cingulum stop on #13 with grp gx)
Final impression and fabrication
Try in and cementation
Adjust premature contacts and review 1wk
