Class II Kennedy implant assisted mandibular removable partial dentures with and without cross arch stabilization: A strain gauge in vitro study.

Early Loading of Short and Standard-Length Dental Implants Retaining Mandibular Kennedy Class I Removable Partial Dentures

“…Shahmiri et al 19 also found that bilateral loading minimized the lateral distorting forces, but placed more strains in the occlusal rests of the principal abutments as the load moved more mesial, this finding verified the results of this study in regards to the placement of the implants in the place of the missing first molar rather than the second molar, as the vertically applied bilateral loading was along the long axes of the principal abutments, and the implants that were placed parallel to them, and being within the limits of the physiologically tolerated loads, the bone density profile of the mesially placed implants was more than the distally placed ones. Hegazy et al, 21 in contrast to the findings of this study, suggested distal rather than placement of the implants, however, in His study, the mesially placed implants were in the premolar region, where as the mesially placed implants in this study were in the first molar region that was surrounded by thick cortical plates that dissipated the vertically applied loads, in contrast to the distally placed implants that suffered longer effort arms and more lateral twisting loading exaggerated by the upward curvature of the distal extension saddles as they approach the retromolar pads as confirmed by ELsyad et al, 30 and Alkhodary 34 who found that distal placement of implants, beneath distal extension partial overdentures, recorded significantly higher stresses than with their mesial placement.…”

“…After one week of implants placement, patients were recalled for suture removal and preliminary impressions making, in the following visits final impressions, registration of jaw relationships, try-in of metal frameworks and wax dentures were made (798) using conventional methods. 20,22,25,27,30,34 After one month of healing for both long and short implants, the ball abutments were attached to the implants, and after final impressions making, replicas of the ball abutments were secured in the impressions to be part of the master casts over which definitive prostheses were flasked including the metal housing of the ball abutments in the IARPDS metal framework as seen in figures 3-5. The IARPDS had a lingual plate major connector, and combination clasps to relieve the abutments during occlusal loading.…”

“…[19][20][21] Another controversial factor was the type of attachment of the implants to the IARPDS, where the ball abutments were found to transmit the least amount of stress to the implants and abutment teeth compared to locator and magnet attachments, when placed parallel to the most distal abutment, however, with reduced stability due to its greater freedom of movement, yet with more benefits and preservation of supporting teeth and implants when combined with mesially placed abutments. [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] Immediate loading of short implants placed in distal extension edentulous spaces was considered an option in the treatment protocols, once primary stability could be achieved in selected cases, [38][39][40][41] also, no significant differences between the conventional loading and immediate loading of short implants were found, [42][43][44][45] with either locator or ball abutment attachments in follow-up periods extending from 2 to 12 years, [46][47][48][49] with preference of prognosis for implants placed in atrophic mandibles compared to atrophic maxillae. [50][51][52][53][54][55][56] Based on the previously presented data, this study aimed at clinical evaluation of early loaded short dental implants, compared to early loaded conventional long dental implants, supporting mandibular K...…”

Strains Induced by Zirconia and Metal Resin Bonded Attachments Versus Extracoronal Attachment With Full Veneer Retainer in Maxillary Distal Extension Removable Partial Dentures

“…To create a realistic stress distribution during loading, soft tissue-simulating material was injected into the periodontal ligament space and applied to the edentulous ridge. 2,36,37 When using extracoronal attachment for distal extension RPDs, fixed splinting of neighboring abutment teeth is critical. To help with force distribution, a minimum of two teeth on each side should be splinted with either full or partial veneer retainers.…”

Kennedy Class II Problems and Treatment Options: A Review of Literature

“…This will increase patients' satisfaction, as many patients complain of the major connector impairing their speech. Besides, the increased retention obtained by the extra coronal attachment minimizes the risk of accidental swallowing of the unilateral prosthesis (Alkhodary, 2020).…”