Purpose of the study:
Manyauthors and some of the clinicians are of the opinionthat tooth preparation
is not the same for CAD-CAM restoration. There are some manufactures who also
recommend preparation taper higher degree. Based on the above notion this study
was conducted whether the tooth preparation has got any bearing in the
scannability of gypsum models. Aims and objectives:Theaim of the study is to
scan the gypsum models using extraoral scanners. The objective of this study is
to evaluate the following features of tooth preparation has any effect on
scannability 1. Different preparation taper 2. Shoulder or chamfer margin 3.
Plane of marginal placement Materials and methods:Six standard metal dies were
prepared with a crown length 8mm, diameter 5mm out of which 1. Three dies with
30, 80, 120taper each with shoulder margin 2. Two dies with shoulder and
chamfer finish line 3. One with marginal geometry in different planes Each die
was duplicated 10 times and a total 60 models were obtained. The stone cast
models were duplicated from the individual metal dies were scanned using extra
oral model scanner INTELLIDENTIA. Results: As far as extraoral scanning is
concerned, there is no significant difference in scanning regarding preparation
taper, finish line and marginal configuration. Conclusion:Currently extraoral
scanners are capable of producing virtual model images irrespective of
preparation taper, Finish line and marginal geometry - See more at:
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