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3.4. Mechanical evaluation of the Multifunctional Healing Abutment. The mechanical evaluation of the multifunctional healing abutment will be divided into the following sections: verification of the most critical dimensional condition, static compression test and extraction test. 3.4.1. Most critical dimension condition. The mechanical evaluation of the multifunctional healing abutment should be carried out with the purpose of proving the safety and efficacy of the product in its most critical dimensional situation, or rather, the one that would be more susceptible to failure due to the smallest section of the component, the place where failure are mostly frequent. Among all commercial models shown in table 11, the component with the smallest cross section is model “05.17.01”. Therefore, among the commercial models registered, the “High Profile Ø4mm Multifunctional Healing Abutment (05.17.01) is considered the most critical condition. 3.4.2. Static test (compression). Materials and methods used. The test is carried out to define a parameter for load force according to what is required by standard ABNT NBR ISO 14801:2012 (Dentistry – Implants – Dynamic fatigue test for endosseous dental implants). As the components in this record are not going to be submitted to high cycle fatigue, because they are supposed to be left in the mouth for up to 30 days, only the static compression resistance is going to be measured according to standard ABNT NBR ISO 14801:2012. In this test, the implant is inserted in a tilted block with an elastic modulus of approximately 3.3 GPa and the healing abutment containing a spherical metallic cap with pre-established dimensions is assembled and activated on the implant. Then, a loading device assembled in a test machine applies a compressive force according to what is shown in figure 15. In that test, the samples are compressed until failure, and the maximum force obtained is recorded.

Figure 15: Diagram showing the configuration of the assembly of the component and load application for the static test.

Five assemblies of implants (4.3X9mm Arcsys Frictional Implant) and healing abutments in the most critical condition (Ø4mm high profile healing abutment, 05.17.01) were tested. The maximum value obtained with the compression of the assembly healing abutment/implant is recorded as the force at the limit of resistance (Flr).

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