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Influence of Cement Gap Size, Surface Preparation, Cleaning Agent and Ageing on the Retention of Cemented Single Ceramic Crowns, Supported by Elos Accurate Hybrid Bases Authors: Mette Line Almquist, Brian Ravn Jensen, Andreas Bak Ingemann, Kasper Duus, Søren Rangstrup, Henrik Andersen, Ole Zoffmann Andersen Date: July 2021 © 2021 Elos Medtech Abstract Introduction: Based on experience with cemented components from various dental labs, the continuous test- ing activities at Elos Medtech indicate that the process of cementing crowns onto dedicated abutment com- ponents is more of an art than an exact science. To gain knowledge of the various factors affecting the sta- bility of the cemented interface, Elos Medtech has initiated activities to support the formulation of “best practice” when it comes to cementation of dental components. Materials and Methods: Four different parameters; cementation gap size, cleaning agents, blasting media particle size, and different forms of ageing have been examined to determine their impact on the adhesive strength of the cemented hybrid base/crown interface. For the experiments, the Elos Accurate Hybrid Base Non-engaging was utilized along with custom made zirconia dental crown analogs. Cementation was per- formed using Panavia V5. Results: The results show that the various tested parameters vary with respect to the overall spread of the data points. However, no significant differences between median values of the tested groups were found. Discussion: The large spread found for some of the test groups support previous observations of varying adhesive strength resulting from components cemented at external labs. Considering that there was no sig- nificant difference between the means of the groups, focus should be on combining the parameters, yielding as narrow a spread as possible, to ensure a consistent result of the cementation procedure. Conclusion: Within the limitations of the current study, it is concluded that cleaning with either Isopropanol or Katana Cleaner are to be preferred over the use of steam cleaning. The cementation gap size should be 40 µm and care should be taken when storing the cemented components at dry conditions over prolonged pe- riods of time. Introduction The use of implant supported dental crowns, in the treatment of edentulism, is popular and well docu- mented [1]. Cementing of crowns on dental abut- ments, using dental adhesive cements, is performed as a routine task at dental labs and in clinical settings, on a daily basis, across the globe. The quality of the cementation is a key parameter for the performance and long-term stability of implant supported restora- tions. This is becoming increasingly important as the market trend is moving towards more frequent use of the versatile, but smaller, hybrid base-type abut- ments [2]. Hybrid bases are well suited for ensuring aesthetically pleasing restorations for situations where the host tissues do not allow for generating an optimal emergence profile using e.g., stock or cus- tom-made titanium abutment. This is especially im- portant when the patient has a high smile line [3]. Since the area of the hybrid base cementing surfaces is typically reduced, compared to conventional abut- ment, the cementation result must be predictable 1