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abutment evaluation
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ABUTMENT EVALUATION
Dr shabeel pn
ROYAL DENTAL COLLEGE
ABUTMENT
a tooth, a portion of a tooth, or that portion of a dental implant that serves to support and/or retain a prosthesis
- GPT
SIGNIFICANCE
The forces applied to the missing teeth are transmitted through the Pontic, Connectors and Retainers to the Abutment teeth and are therefore called upon to withstand the forces normally directed to the missing teeth, in addition to those usualy applied to the abutment
CONSIDERATIONS
Better to select VITAL teethEndodontically treated tooth with good seal
& complete obturation If coronal tooth structure is lost, strength
regained by Dowel Core, Pin Retained amalgam or composite resin core
Never in pulp capped teeth
CONDITION OF SUPPORTING TISSUES
Evaluated for three factors
- CROWN - ROOT RATIO
- ROOT CONFIGURATION
- PERIODONTAL AREA
CROWN – ROOT RATIO
LENGTH OF TOOTH OCCLUSAL TO CREST OF ALVEOLAR BONE
LENGTH OF ROOT EMBEDDED IN BONE
OPTIMUM RATIO IS 2:3 RATIO OF 1:1 IS MINIMUM ACCEPTABLE AS THE LEVEL OF ALVEOLAR BONE MOVES
APICALLY, THE LEVER ARM OF THAT PORTION OUT OF BONE INCREASES
ROOT CONFIGURATIONRoots that are Broader bucco-lingually than
mesio distally are preferable Multi rooted posterior teeth with widely separated
roots offer better support than conical or fused roots
A single rooted tooth with irregular configuration or some crvature in the apical third is preferrable
A well aligned tooth will provide better support
PERIODONTAL AREA
It includes root surface area & periodontal status
Regarding Root surface area, Ante in 1926 suggested a law – Ante’s Law
“this law states that abutment teeth should have a combined pericemental area that the tooth or teeth to be replaced”
THANK YOU