Determination of cantilever length-anterior-posterior spread ratio assuming failure criteria to be the compromise of the prosthesis retaining screw-prosthesis joint

Loosening of the fixing screw in single implant crowns: predisposing factors, prevention and treatment options

“…]. The forces are directly dependent on the anterior‐posterior dispersion of the implants and the length of the cantilever . Similarly, the frequency of complications (mainly loosening and fractures of the fixing screws) is higher when the length of the cantilever is increased…”

“…Summarizing the issue of cantilevers, older in vitro studies have shown increased stress concentrated on the cantilevers and clinical studies reported lower success rates and increased technical complications for cantilevered FDPs . On the other side recent systematic reviews and clinical studies suggest that implant‐supported FDPs are a safe treatment option without increased risk of technical complications …”

Factors affecting peri‐implant bone resorption in four Implant supported mandibular full‐arch restorations: a 3‐year prospective study

“…All prostheses consisted of 12 acrylic veneerings (GC Gradia; Kerr, WA, USA; 1 molar per side) with the extension varying in size. The 4‐ISFMP were cantilevered posteriorly with no more than 1.5 times the anterio‐posterior distance between the mesial and distal implants as described in the studies of McAlarney & Stavropolous (). A representative case is presented in Fig.…”

Treatment planning of the edentulous mandible

“…To reduce the loading of the terminal implant some have advocated placing short implants distal to the mental foramina and having the cantilever segments rest on the implants without being connected. [38][39][40][41][42][43][44] Once implants have been placed they can: 1) have cover screws placed and submerged under the mucosa (two stage); 2) have healing caps placed and have mucosa sutured around them (single stage); and 3) be immediately loaded. There are sufficient publications documenting the safety and efficacy of immediately loading implants that are splinted in the anterior mandible and this is the standard protocol of the authors.…”