One-Tooth One-Time (1T1T): a straightforward approach to replace missing teeth in the posterior region

Advances in Computer-Aided Design and Manufacturing (CAD-CAM) composite materials and
chair-side CAD-CAM systems offer a new landscape for the implant dentistry. Digital workflows
are increasingly used, especially for single-unit restorations, and they allow straightforward and
cost-effective protocols that improve patient satisfaction.
The efficacy of immediate loading on single implants has been demonstrated (1, 2). Currently, to
12 promote osseointegration, the use of resin-based provisional crowns out of occlusion is
recommended for immediate loading. Such protocols require several appointments and a
significant contribution of the dentist and the lab technician, which affects overall treatment cost.
On the other hand, CAD-CAM composites, especially Polymer-Infiltrated Ceramic Network
(PICN), are now competing with ceramics for definitive single-unit restorations, notably due to
their better machinability (faster and in lower-thickness milling, with les edge chipping) (3) (4), the
absence of post-milling firing and the ease of in-mouth adjustments. In particular, their higher
resilience and lower elasticity modulus could indicate them for immediate loading of implants.
Intraoral scanning (IOS) of single-unit implants right after surgery and the chair-side
manufacturing of a PICN crown would allow delivery of a resilient final tooth on the same day.
The aim of these two case reports is to describe, as a technical note, an innovative approach for
a straightforward and cost-effective replacement of a single missing tooth in the posterior region,
as a proof of concept.