transparent gif


Ej inloggad.

Göteborgs universitets publikationer

The accuracy of implant impressions with digitally coded healing abutments

Författare och institution:
Alf Eliasson (-); Anders Örtorp (Institutionen för odontologi)
Publicerad i:
19th Annual Scientific Meeting of the European Association of Osseointegration – 6-9 October 2010, Glasgow,
Konferensbidrag, poster
Sammanfattning (abstract):
Background: A new healing abutment (Encode®) provided with digital coded information on length and diameter on the top, has been launched. So far no studies have evaluated working cast fabrication using impressions of the digitally coded abutment and implant analog placement by a robot technique (Robocast®). Purpose: To compare the accuracy of implant analog placement in working casts with a robot technique using an impression of digitally coded healing abutments, and the traditional technique with implant pick-up impression copings. Materials and methods: One acrylic master model provided with three reference spheres and two groups of three implant analogs placed bilaterally, was fabricated. Three Encode® healing abutments were mounted on the right side (test) and conventional pick-up impression copings on the left side (control). Fifteen impressions were made with silicone material in customized trays. Implant analogs were placed manually on the impression copings (control) in the impression before pouring with dental stone. After setting of the stone cast, analogs on the test side were placed by the Robocast® technique using information gathered from a scanning of the digitally coded abutments. Implant analogs positions were measured with a Laser Measuring Machine. The center-point of each implant analog fitting surface were registered in x-, y-, z-axis as well as angular direction of center axis and position of the antirotational hex. Two-way ANOVA analyses were performed using SPSS 17.0, the statistical significance was set at P<0.05. Results: None of the two impression techniques presented working casts without distortion of the implant analogs positions as compared to the master model. Mean (SD) center-point distortion for test and control side were in x-axis 37 (28) μm and 18 (13) μm, respectively P<.005, in y-axis 47 (35) μm and 14 (11) μm, respectively P.001, and in z-axis 35 (29) μm and 15 (15) μm, respectively P<.05. Mean angular distortions were 0.41 (0.25) degrees for the tests and 0.14 (0.11) degrees for the controls P0.001. Mean rotation of the hexagon was 2.88 (1.60) degrees for test and 1.82 (0.63) degrees for controlP0.001. Conclusions: Within the limitations of this study, the following conclusions can be drawn: Both conventional and digital impression technique presented low levels of distortion of the implant analogs positions in all casts. A silicon impression of digitally coded abutments and a robot placement technique resulted in a less precise analog placement as compared to conventional impression technique. However, the differences in accuracy were small and both techniques are precise enough for single crowns and short span implant supported fixed partial prostheses.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Klinisk medicin ->
Klinisk medicin ->
Odontologi ->
Oral protetik
Postens nummer:
Posten skapad:
2011-01-20 14:16

Visa i Endnote-format

Göteborgs universitet • Tel. 031-786 0000
© Göteborgs universitet 2007