Background: The Acuris abutment was introduced to the market in 2018. The purpose was to design an abutment that merges the Conometric concept approach and the need for a NO-rotational abutment for retention of a single restoration.

Aim/Hypothesis: This study was conceived in order to evaluate the rehabilitation of the healed single implant placed to replace premolar and molar teeth using a lithium disilicate restoration supported by the Acuris Conometric abutment.

Materials and Methods: All implants were placed to treat a mandibular or a maxillary single-tooth edentulism. The Acuris NO-rotational abutments were placed three months after surgery. A single lithium disilicate restoration was pressed, cemented to an Acuris Conometric definitive cap and placed in the mouth of the patient. Esthetic, functional and biologic United States Public Health Services (USPHS) parameters modified by the FDI World Dental Federation study design, peri-implant pocket depths, bone and soft tissue remodeling were recorded.

Results: 506 (97.8%) of the cases included in the study have been followed-up for 14 months. One restoration (0.19%) fractured after 10 months of function. 298 (58.89%) restorations were supported by Ankylos implants, 113 (22.24%) by XiVe implants and 95 (18.7%) by Astra implants. A mistake in the reproduction of the INDIAx position during the impression phase caused a complete lack of retention in 3 (0.58%) cases. The profile of the restoration had to be modified in its transmucosal (21 cases, 4.05%) or interproximal (37 cases, 7.14%) portion in order achieve a perfect seating. 15 (2.89%) and 30 (5.78%) patients respectively perceived an early contact or asked for a modification of the teeth shade immediately after the placement of the restoration. 2 (0.38%) patient were not satisfied of the esthetic of the emergence profile (too bulky) and asked for a new restoration. 39 patients (7.52%) reported minor occlusal abrasions or wear of the superficial color at the one-year control (T2).

Conclusions and Clinical Implications: The Acuris Conometric abutment is a viable option to retain an implant-supported monolithic lithium disilicate (LS2) glass-ceramic crown in cases of premolar or molar single-tooth edentulism. The preliminary results of this study will be further analyzed in an ongoing research with a long-term follow-up.

Keywords: Conometric Concept, Acuris, Lithium disilicate