Conventional Versus Digital Impressions for "All-on-Four" Restorations

Area of Science:

• Dentistry
• Prosthodontics
• Dental Implantology

Background:

• Severe atrophy of the mandible or maxilla often necessitates full-arch rehabilitations.
• The
• All on Four
• technique utilizes four implants for immediate load prostheses.
• Accurate impression techniques are crucial for successful implant-supported restorations.

Purpose of the Study:

• To compare the accuracy of conventional impression techniques (CIG) versus digital impressions (DIG) for
• All on Four
• restorations.
• To evaluate the clinical outcomes and efficiency of digital impressions in full-arch implant rehabilitations.

Main Methods:

• This study included edentulous patients with severe atrophy undergoing
• All on Four
• rehabilitation.
• Patients were randomly assigned to either conventional pick-up or digital impression groups.
• Accuracy was assessed via intraoral digital radiographs, with 3-, 6-, and 12-month follow-ups.

Main Results:

• A 100% implant survival rate was observed in all patients.
• Digital impression procedures were significantly faster than conventional methods (P < .001).
• No significant differences in accuracy were reported between the two impression techniques.

Conclusions:

• Digital impression techniques provide satisfactory accuracy for computer-aided design/computer-assisted manufacturing (CAD/CAM) cobalt-chromium full-arch rehabilitations.
• Digital impressions are an efficient and reliable alternative to conventional methods for
• All on Four
• restorations.