Division of Prosthodontics, Department of Biomedical and Neuromotor Science, Alma Mater Studiorum University of Bologna, Bologna, Italy.
Division of Periodontology, Department of Biomedical and Neuromotor Science, Alma Mater Studiorum University of Bologna, Bologna, Italy.
J Prosthodont. 2019 Jun;28(5):536-540. doi: 10.1111/jopr.12991. Epub 2018 Dec 3.
The aim of this report is to describe two standardized protocols for digital impression when implant support rehabilitation is used in the esthetic area. The two techniques were used to transfer all provisional crown parameters to definitive restorations in different clinical scenarios. In the direct technique, an impression (STL1) is made of the provisional restorations attached to the implants, with surrounding gingival tissue. The second scan (STL2) captures the sulcular aspect of the peri-implant soft tissue immediately after removal of the provisional restoration. The last impression (STL3) of the complete arch is made with a standardized scanbody attached to the implant to capture the 3D location of the implant. The direct technique is indicated when the peri-implant soft tissues are stable upon removal of the provisional restoration. The indirect technique is used when the gingival tissue collapses rapidly after the removal of the provisional crown. The impressions of the provisional restoration and the position of the implant are similar to those obtained with the direct technique, and the shape of the peri-implant tissue is extrapolated from the negative shape obtained from making the digital impression when the provisional restoration is taken out of the mouth. Finally, in both techniques the 3 scans are superimposed to obtain a file, which contains the details of the peri-implant soft tissue. The direct and indirect digital techniques allowed realization of a predictable definitive restoration in the esthetic zone in different clinical scenarios, reducing the duration of clinical procedures.
本报告旨在描述两种用于在美学区域中进行种植体支持修复时的数字化印模的标准化方案。这两种技术用于将所有临时冠的参数转移到不同临床情况下的最终修复体中。在直接技术中，对附着在种植体上的临时修复体及其周围的牙龈组织进行印模（STL1）。第二次扫描（STL2）则在临时修复体被移除后立即捕捉种植体周围软组织的龈沟侧。最后，使用附着在种植体上的标准化扫描体对完整牙弓进行第三次印模（STL3），以捕捉种植体的三维位置。当临时修复体移除时，种植体周围软组织稳定时，采用直接技术。当临时冠移除后牙龈组织迅速塌陷时，使用间接技术。临时修复体的印模和种植体的位置与直接技术获得的相似，并且从从口腔中取出临时修复体时进行数字化印模获得的负形中推断出种植体周围组织的形状。最后，在这两种技术中，将这 3 个扫描叠加以获得一个文件，其中包含种植体周围软组织的详细信息。直接和间接数字化技术允许在不同的临床情况下在美学区域中实现可预测的最终修复体，减少临床操作的时间。
