General Considerations Flashcards
a specific tooth that the bridge latches onto
abutment
a specific crown that sits on top of the abutment
retainer
fake tooth in between retainers
pontic
between retainer and pontic
connector
fake tooth only supported on one side by a retainer
cantilever
abutment tooth that has no adjacent teeth in proximal contact
pier
Patients with poor prognosis for a dental bridge can exhibit the following characteristics:
- equal or less than half alveolar bone support around abutment teeth
- connectors not strong
- pier (intermediate abutments)
- singular retainer cantilever
- multiple-splinted abutment teeth
lock and key mechanism
tenon (male component) and mortise (female component)
The following teeth should never be considered as an abutment tooth:
1) Compromised periodontal teeth
2) Endodontically treated teeth (less internal dentin after RCT, thus it is a weaker tooth)
ideal crown:root ratio
1:2
clinical vs anatomical crown and root
Clinical crown = above the bone
Clinical root = below the bone
Anatomical crown = above the CEJ
Anatomical root = below the CEJ
law that states that the total periodontal surface area of the abutment teeth should be greater than or equal to the surface area of the teeth they are replacing
Ante’s law
used when the periodontal surface area of the abutment tooth is insufficient to attach a bridge and Ante’s law cannot be obeyed, distributes occlusal forces across multiple teeth
splinting
These two teeth must be splinted together when canines are replaced to prevent lateral drifting of the bridge.
central and lateral incisors
preferred vs non-preferrable characteristics of root shape
Preferred: broad roots, divergent, curved, multiple
Non-preferrable: round roots, fused, conical, single
Indications for a RPD over a bridge:
- bridge or implant is too costly
- distal extension (all of teeth distal to a certain point are missing)
- bone loss around potential abutment spaces
- long span of edentulous teeth
When are upper complete dentures contraindicated?
when only mandibular anterior teeth are available (combination syndrome)
classic implant placement for an overdenture
4 implants in maxilla, 2 implants in mandible
Cement-retained vs screw-retained implants
Cement-retained
- inexpensive
- used for minor angle correction
- more chair time, same propensity to loosen as a screw retained implant
- excess cement can cause peri-implantitis (important to clean implant area after cementation)
- recommended in small teeth
Screw-retained
- easy to remove the crown to clean it and place it back on
- screw may loosen while chewing
