Evaluation of Impression Accuracy: Digital Scanner Versus Analog Technique

Evaluation of the Accuracy of Intraoral Scanner Versus Analog Impression in Implant Supported Rehabilitations Performed With Flapless Computer-Guided Implantology

The goal of this study is to evaluate the accuracy of intraoral impressions obtained using the Trios 3Shape® and Carestream CS 3600™ scanners, as well as traditional analog impressions using polyvinyl siloxane (PVS), in comparison to a gold standard represented by a laboratory scanner in 51 dental models from 42 patients affected by partial edentulism who required at least two implants.

Researchers compare Trios 3Shape®, Carestream CS 3600™ and polyvinyl siloxane (PVS) to see if there is a different accuracy.

Inclusion Criteria:

• Age between 18 and 80 years;
• Implant placement in healed bone sites (at least 8 weeks post-tooth extraction or at least 6 months after regenerative procedures), allowing guided implant insertion of at least 3.3 mm in diameter or 8.5 mm in length;
• Implant site without ongoing infections or dental extraction residues;
• Good systemic health conditions and adequate oral hygiene;
• Periapical and periodontal health of opposing teeth/implants in occlusion;
• Edentulism of at least two adjacent dental elements.

Exclusion Criteria:

• Ongoing diseases requiring prolonged use of corticosteroids;
• Leukocyte dysfunction or deficiencies;
• Severe hemophilia;
• Current pregnancy;
• Past and/or current head/neck radiotherapy and/or chemotherapy;
• Renal insufficiency;
• Past and/or current use of bisphosphonates;
• Uncompensated endocrine disorders;
• Physical disabilities preventing adequate oral hygiene;
• Alcohol abuse and drug use;
• Smokers (>10 cigarettes/day);
• Untreated periodontitis;
• Mucosal diseases (e.g., erosive Lichen Planus);
• Severe parafunctional habits (e.g., bruxism or clenching);
• Persistent intraoral infections;
• Allergies or adverse reactions to restorative materials;
• Completely edentulous arches;
• Limited mouth opening;
• Inadequate oral hygiene or lack of motivation for self-care;
• Uncontrolled systemic diseases;
• Untreated or chronic oral cavity diseases;
• Fully edentulous arches.