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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
The main problems during the first session were that the acrylic jaw fractured due to excessive pressure or mishandling of the implant placement. Furthermore, the correct depth was not always achieved with the drills. Some of these mistakes were shown with the red arrows.