An alternative method for registering the abutment screw position of cement-retained implant restorations

A method of locating the abutment screw access channel with cone-beam computed tomography and a 3D-printed drilling guide

“…4 To retrieve a loosened cement-retained implant prostheses, it may be necessary to create a screw access channel through an existing restoration. Several methods for locating the screw access channel have been described, including using ceramic stains, 5 acrylic resin; 6 fabricating a vacuumformed template, 7 forming a silicone putty matrix, 8 using a handpiece sleeve, 9 making extraoral and intraoral photographs, 10 and designing and printing a drilling guide at the time the implant abutment is designed.11, 12 All these techniques require a definitive cast to fabricate a drilling guide. The precision of the procedure is variable and depends on the chosen technique and the capabilities of the clinician.…”

Non‐Radiological Method for Fabrication of a Screw‐Channel Drilling Guide in Cement‐Retained Implant Restorations Using Intraoral Digital Scanning and Imaging Superimposition: A Clinical Report

“…As a more advanced technique, superimposition of the abutment image and the crown image has been suggested to provide a visual guideline for the screw‐access hole . This technique is simple and can be performed rapidly using editing software . However, all of these techniques provide limited, 2D information regarding the position of the abutment screw; estimating the screw position can be quite difficult in practical use, especially when implants are malposed or tilted.…”

Combining digital photography with cylinder-type magnets to record the screw access hole in a cement-retained implant prosthesis

“…This article suggests an inexpensive and straightforward technique that can be applied to the laboratory cast immediately before the cementation procedure to facilitate access to the abutment screw in a cementretained implant restoration. Although the technique is limited in that it does not provide the angulation of the site of entry and is mainly applied to posterior implant restorations, the advantages of this technique over the disadvantages are as follows: it requires neither complex photograph making skills (for example, superpositioning technique) nor photograph editing software 10,11 ; it does not require a specific physical device (for instance, guide template) 12 ; it does not require additional space to store the original dental casts; it is a noninvasive technique 13 ; and magnets are the only materials required and are reusable between patients.…”