Open AccessA simple method for unscrewing (removing) implant-borne cemented single-unit crowns
Author(s) -
Radu Baston,
Peltecu Medical Srl,
Michael Vitzu,
Universitatea „Titu Maiorescu“ Catedra de Protetică Dentară
Publication year - 2015
Publication title -
romanian journal of stomatology
Language(s) - English
Resource type - Journals
eISSN - 2069-6078
pISSN - 1843-0805
DOI - 10.37897/rjs.2015.2.5
Subject(s) - crown (dentistry) , abutment , implant , retrievability , dentistry , dental abutments , dental implant , orthodontics , medicine , computer science , engineering , surgery , structural engineering , precision and recall , machine learning
Definitions. The biomechanical risk factors individually analyse the most relevant bio-mechanical aspects of implant-borne rehabilitations. They are expressed by numbers and can be used to foresee the outcome of a case yet to be treated or to analyse the achieved result of an already completed case. The biomechanical score is the outcome of a calculation method intended to assess the long-term result of an implant-borne rehabilitation. SRIAC (Screw-Retained Integrated Abutment Crown) is a single-tooth, implant-borne rehabilitation manufactured of indirect composite which is chemicaly bonded to its abutment. Both are screwed into the implant as a one-piece unit. Aim. To present a simple method which enables safe removal, e.g. safe unscrewing of cemented implant-borne single-tooth crowns. Materials and methods. For the purpose of this study we have treated between January 2014 and February 2015 forteen single-tooth implant-born cemented crown cases which can be removed, e.g. unscrewed anytime due to their occlusal screw opening. Further on, in order to check if the achieved retrievability has improved their outcome, we have calculated for each crown the corresponding Renouard-Rangert biomechanical score. Results. For all the 14 cases the biomechanical score has improved with at least 0.5 points. Discussion. The presented cases come up with a simple solution which enables the crown-abutment one-piece to be unscrewed/screwed en-bloc. Conclusions. 1. This method can be applied using both straight or angled abutments for cemented superstructures. 2. This method enables manufacturing implant-borne screw-retained single-tooth crowns even if the abutment for screw-retained superstructures does not feature an anti-rotational locking system. 3. This method cannot be applied in the front area if the abutment screw extension is protruding through the buccal side of the crown. 4. Definitive conclusions will be reached based on statistic data including at least 100 cases followed-up for at least 5 years.