Stresses induced by one piece and two piece dental implants in All-on-4® implant supported prosthesis under simulated lateral occlusal loading: non linear finite element analysis study

Abstract

Background Correct choice of the implant design and the occlusal scheme is important for the success of implant supported restorations. So, the aim of the current study was to find out the difference in the stresses induced by the one piece dental implants designed to be used in the All-on-4® concept and the conventional two piece ones under simulated lateral occlusal schemes using nonlinear finite element analysis. Methods Two finite element models of the maxilla, implants, and prostheses were designed according to the All-on-4® concept. In the model TP, two piece dental implants were placed while in the model OP one piece dental implants were used. Two loading scenarios were applied to each model; the first one simulated a group function occlusal scheme while the second scenario simulated a canine guided one. Results The highest stress value was recorded in the model TP with the group function occlusion and the lowest stress value was in the model OP with the canine guidance occlusion. Conclusion The one-piece dental implants can be concluded to induce less stress compared to the two piece dental implants when used in the All-on-4® implant supported prosthesis in the different lateral occlusal schemes. Canine guided occlusion can be concluded to cause lower stress values in comparison to the group function occlusal scheme.

Finite Element Modelling Based Studies for Dental Implants: Systematic Review

“…It may be concluded that OP dental implants were with a lower stress value than TP dental implants when they served in the All-on-4 implant-supported restoration of different occlusal/lateral schemes. Lower stress levels are obtained with canine-guided occlusion as compared to the group function occlusal scheme [61].…”

Biomechanics of implant-supported restorations

“…However, little is known about the differences in the biomechanical behavior of screw or cement retained prostheses. According to a previous study that compared the pre-load maintenance, stresses, and displacements of prosthetic components of screw and cement retained implant-supported crowns, the screwretained prosthesis demonstrated a higher risk of screw loosening and fracture [42].…”

“…Furthermore, an occlusal anatomy design with reduced cusp angulation and less evident occlusal sulcus, can reduce the stress concentration and increase the fracture load for ceramic posterior crowns. Therefore, less pronounced occlusal anatomy would improve implant loading distribution and could be beneficial for the survival of the restoration [41][42][43].…”

Finite element method for the study of stresses in the implant and the surrounding bone in improving the quality of treatment of complete adentia

“…Анализ мировой литературы и полученных научно-теоретических данных о повышении эффективности оказания ортопедической помощи пациентам с полной адентией дал возможность сформировать некоторые предложения об интерпретации сравнительной картины распределения напряжений для различных видов имплантатов с проведением дополнительных исследований методом конечных элементов [12,13,14].…”