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18 Cards in this Set
- Front
- Back
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t/f there is always a risk of perforating the PDL or pulp chamber when placing pin channels in at the level of the cej
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T
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Which pin channel perforation is easier to manage: into the pulp or into the CEJ
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pulp. CEJ is more serious.
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what is The minimal thickness of dentin surrounding pins placed in dentin
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0.5mm
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what is the safe location for placing channels for self threading pins in the posterior teeth
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proximo facial and proximo lingual line angles.
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two significant factors to consider when placing anterior PVCs, as opposed to posterior PVCs
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Tooth Morphology, Occlusion in lateral and protrusive,
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Why have anterior PVCs decreased in popularity since the sixties and seventies? 2 reasons
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Single tooth implants, Development of resin bonded fixed prostheses in the 70s and 80s. Concern with metal free restorations and high failure rate are not true.
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properties for all cemented pins: length and width
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at least 3 mm long and 0.05mm less in diameter than the pin channel
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pinledge prep: what is the minimum pin depth?
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2mm
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4 ways that undercuts can arise when preparing two teeth as abutments for a 3 unit bridge
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Between abutment teeth, between abutment adjacent tooth, opposite walls of same abutment, due to incorrect flaring of grooves and boxes
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what should the proximal grooves be parallel to in an anterior PVC
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the facial incisal two thirds.
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Does the dowel portion of the cast dowel core for a single rooted tooth increase the fracture resistanc of the root
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NO
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What makes up the new philosophy on post core strngthening of the tooth
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post holds core in place, core replaces lost coronal structure, crown holds it all together
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which offers more retention, smooth (passive) or threaded (active)
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active, but active has increased stress during deliver andfunction
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Question
When do you prepare the root canal? 1. Before the coronal tooth preparation or 2. After the coronal tooth preparation |
Answer
If there is direct access to the canal and the endodontist provides the working length and a reference, prepare canal prior to coronal tooth prep, if NOT, first prep tooth, second take an PA radiograph and then determine canal preparation length before canal prep. |
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4 Indications for Indirect Custom Cast P & C
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• Multiple P & C ’ s
• P & C ’ s with same POI • Multiple Segment P & C • Poor access for direct technique |
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Two-Step P & C/ Restoration
Advantages |
• Better Marginal Fit - Expansion Control
• Easy Restoration Replacement w/o Post Removal • Independent Post/Crown POI - FPD Abutments |
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rationale for includeing a cement vent in all cemented dowels
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allow cement to escape and reduce hydraulic pressure during cementation
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indications for nonrigid connectors
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bridge abusment have different poi, design simplification of exgtensive bridgework, ease of cementation of components of extensive bridgework, FPD with a pier abutment
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