Accuracy of digital and conventional implant impressions
mercredi 25 avril 2018
Precision is key when creating a dental cast. To optimise occlusion and ensure a perfect fit for restorations, the cast of the entire arch must be completely accurate – there is no room for error. With digital techniques and approaches becoming increasingly ubiquitous in implant dentistry, we must ask if these new techniques are as precise as conventional methods.
A study conducted at the University of São Paulo has analysed digital and conventional implant impressions and examined the accuracy of the two methods. The quality of a dental cast relies largely on the CAD-CAM system used. However, its accuracy is not guaranteed, as errors can still be introduced during the scanning or manufacturing phases.
As part of the study's methodology, a maxillary master model with canine and pre-molar implants was created. Next, casts were made using both conventional and digital (stereolithographic) methods. To test the accuracy, the two casts and the master model were digitised and a deviation analysis was carried out. Linear measurements were also taken.
The researchers found that the stereolithographic cast showed a greater degree of variation than the conventional cast in certain areas, specifically at vestibular and lingual cusps. No difference was found between the linear measurements of the two casts. Overall, the accuracy between the two casts was roughly comparable, though in some areas the conventional casts were more accurate.
This study was presented as an e-poster at the 2017 EAO Congress.