학술정보

2.2.4 Digitization of simulated clinical dental impressions: virtual three-dimensional analysis of exactness.

2. Desktop Scanner
2.2. desktop scanner- accuracy
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2019-01-01 15:51
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2.2.4

Persson AS, Oden A, Andersson M, Sandborgh-Englund G.

Digitization of simulated clinical dental impressions: virtual three-dimensional analysis of exactness.

Dental materials. 2009;25(7):929-36.

 

OBJECTIVES:

To compare the exactness of simulated clinical impressions and stone replicas of crown preparations, using digitization and virtual three-dimensional analysis.

METHODS:

Three master dies (mandibular incisor, canine and molar) were prepared for full crowns, mounted in full dental arches in a plane line articulator. Eight impressions were taken using an experimental monophase vinyl polysiloxane-based material. Stone replicas were poured in type IV stone (Vel-Mix Stone; Kerr). The master dies and the stone replicas were digitized in a touch-probe scanner (Procera) Forte; Nobel Biocare AB) and the impressions in a laser scanner (D250, 3Shape A/S), to create virtual models. The resulting point-clouds from the digitization of the master dies were used as CAD-Reference-Models (CRM). Discrepancies between the points in the pointclouds and the corresponding CRM were measured by a matching-software (CopyCAD 6.504 SP2; Delcam Plc). The distribution of the discrepancies was analyzed and depicted on color-difference maps.

RESULTS:

The discrepancies of the digitized impressions and the stone replicas compared to the CRM were of similar size with a mean+/-SD within 40microm, with the exception of two of the digitized molar impressions. The precision of the digitized impressionsand stone replicas did not differ significantly (F=4.2; p=0.053). However, the shape affected the digitization (F=5.4; p=0.013) and the interaction effect of shape and digitization source (impression or stone replica) was pronounced (F=28; p<0.0001). The reliability was high for both digitization methods, evaluated by repeated digitizations.

SIGNIFICANCE:

The exactness of the digitized impressions varied with shape. Both impressions and stone replicas can be digitized repeatedly with a high reliability.

서울특별시 중구 남대문로9길 12 서울미래치과
E-mail : sbher69@daum.net

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