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01.12.2018 | Research article | Ausgabe 1/2018 Open Access

BMC Oral Health 1/2018

Evaluation of concordance between CAD/CAM and clinical positions of abutment shoulder against mucosal margin: an observational study

Zeitschrift:
BMC Oral Health > Ausgabe 1/2018
Autoren:
Jan K. Pietruski, Anna Skurska, Anna Bernaczyk, Robert Milewski, Maria Julia Pietruska, Peter Gehrke, Małgorzata D. Pietruska

Abstract

Background

While working on CAD/CAM-customized abutments, the use of standard impression copings with a circular diameter produces inconsistency within the emergence profile. It may begin with a collapse of the supra-implant mucosa during impression taking, then lead to a computer-generated mismatch of the position and outline of the abutment shoulder, and consequently result in a compromised outcome of anticipated treatment. The aim of the study was to compare the virtual and clinical positions of the abutment shoulder in relation to the mucosal margin after the abutment delivery.

Methods

Conventional open-tray impression takings followed uncovering surgery. Master casts were scanned with a desktop scanner. Clinical examinations took place after abutment’s insertion and temporization (T1) and prior to cementation of the definitive crown (T2). The distances between the abutment shoulder and marginal soft tissue were measured intraorally in four aspects and juxtaposed with those on the virtual model.

Results

The study evaluated 257 dental implants and CAD/CAM-customized abutments. As T1 and T2 showed, there was a positive correlation between the virtually designed abutment shoulder position and matching clinical location relative to the mucosal margin. In 42.1% of cases, the distance between the mucosal margin and the abutment shoulder did not change. It increased in 36.3% of cases while a decrease occurred in 21.6% of them.

Conclusions

Computer-set position of the abutment shoulder in relation to the mucosal margin can be predictably implemented in clinical practice.
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