Consensus Conference Panel Report: Crown-Height Space Guidelines for Implant Dentistry—Part 2

Abstract

The International Congress of Oral Implantologists sponsored a consensus conference on the topic of Crown Height Space on June 26-27, 2004 in Las Vegas, Nevada. The panel communicated on several occasions before, during, and after the meeting, both as a group and among individuals. A consensus of one opinion was not developed for most issues. However, general guidelines emerged related to the topic. The following article is Part 2 of a summary of several of the guidelines that should be of benefit to the profession at large. (Part 1 appeared in Implant Dentistry 2005;14:312-321.).

Efficacy of Cancellous Block Allograft Augmentation Prior to Implant Placement in the Posterior Atrophic Mandible

“…5,6 The increased biting forces in the posterior mandible result in a variety of stress elements. 10,11 Biomechanical complications in the posterior mandible, such as crestal bone loss, screw loosening, occlusal material fracture, prosthesis wear, and fracture and implant failure, are often the result of excessive stresses caused by the increased biting forces. 10,11 Biomechanical complications in the posterior mandible, such as crestal bone loss, screw loosening, occlusal material fracture, prosthesis wear, and fracture and implant failure, are often the result of excessive stresses caused by the increased biting forces.…”

Implant Supported Fixed Restorations versus Implant Supported Removable Overdentures: A Systematic Review

“…On the contrary, the patient’s degree of satisfaction depends on aspects such as function, comfort, aesthetics, taste sensation, speech difficulties, and personal confidence [33]. Patient’s preference may be the chief controlling factor for selecting the prosthesis design [34]. Dental implants studies generally target the success and failure from a biological point of view, whereas fewer investigations have been carried out on patient satisfaction [35].…”

“…Patients often need a fixed prosthesis to feel teeth integrity as a part of their mouth which cannot be provided through a removable prosthesis. Such enhancement has a positive dramatic effect on improving masticatory efficiency [34]. Adding to that, its documented that full lower-jaw prostheses seem to provide lower satisfaction, probably due to the centrifugal resorption pattern of the mandible that affects the osteomucosal support of the residual ridge, which frequently results in flat ridges [48].…”

The Use of Cancellous Bone-Block Allograft for Reconstruction of the Atrophic Alveolar Ridge

“…The increased biting forces in this region can create excessive stress (Devlin & Wastell, 1986;Gibbs et al, 1981;Mericske-Stern et al, 1995) that lead to crestal bone loss, screw loosening, occlusal material fracture, prosthesis wear and fracture, and implant failure (Goodacre et al, 2003;Misch et al, 2005Misch et al, , 2006Nissan et al, 2011aNissan et al, , 2011b. Therefore, special attention needs to be addressed to the opposing arch and the crown-to-implant ratio (Misch et al, 2005(Misch et al, , 2006. Treatment planning should take several factors into account: eliminating lateral interference during excursive movements; decreasing the occlusal table relative to the implant diameter or maximizing the implant diameter to minimize off-axis forces; shortening or eliminating cantilevers; increasing the number of implants (Pikos, 2000;Mische et al, 2005Mische et al, , 2006.…”