A three‐dimensional printed assembled sleeveless guide system for fiber‐post removal

Abstract

This report describes a technique to develop a three-dimensional printed assembled sleeveless guide system to aid the fiber-post removal in a safe and efficient way. The surface and volume data of the dentition containing the targeted tooth were acquired with optical scanners and cone-beam computed tomography. The virtual path of the fiber-post removal was determined and integrated with a guide prototype with a cylindrical passage. The prototype data was split into two separate parts, combined with the matched pin and jack structures to facilitate the assembly. A guide tube was generated based on the axis of the cylindrical passage, split into three units, and combined with the previously processed data with connectors to form the finalized guide system. The adaptor for the head of handpiece was designed to facilitate the guidance. All the finalized data were printed with titanium alloy. The fiber-post of the upper right central incisor was successfully removed with the aid of this assembled sleeveless guide system that guides the handpiece rather than the rotary instrument.

Post Removal Using Guided Endodontics: A Systematic Review of the Literature

“…All studies except for one used a guide with a sleeve to establish minimum deviations of the drill [22]- [27], [29]. One case report introduced a novel sleeveless guide approach which showed to be effective without complications, but its accuracy was not measured [28]. The reviewers suggest that future studies examine the substance loss and accuracy of this technique.…”

“…Another limitation is that the reporting of data in case reports was not uniform, and the parameters used in each study were heterogenous. Five of the studies did not report the voxel size or field of view used in the CBCT [23]- [26], [28], [29]. The reviewers observed a big variability among the studies regarding the CBCT machine, scanner, and printer used.…”

“…The effectiveness was measured by the reviewers as the ability to remove the dental post without causing severe complications such as a fracture or a perforation of the root. In all case reports the post was successfully removed with no complications (100% success rate) [22]- [28] In one in vitro study the post was removed from all but one tooth (97.5% success rate) where perforation occurred [29]. In the other in vitro study, the post was removed in 87.5% of the teeth, in one case it was unsuccessful because the drill bit hit the canal wall [30].…”

“…No clinical trials or cross-sectional studies were identified. A total of 3 males and 5 females ranging from 13 to 63-years-old were included in the case reports [22]- [28]. The following teeth were used in the included studies: Maxillary incisors, maxillary bicuspids, maxillary molars, mandibular bicuspids, mandibular molars.…”