The effect of luting cement type and thickness on stress distribution in upper premolar implant restored with metal ceramic crowns

Abstract

Objective: to study the effect of using two cement types, with three different thicknesses, on stress levels and distributions within bone around implant premolar using three-dimensional Finite Element Analysis techniques. Materials & methods: A three 3D Finite Element models were built for this purpose. Threaded titanium dental implant was implemented in simplified geometry for jaw bone. While the crown geometry, was acquired by 3D scanner. Two cement materials (Zinc phosphate, Glass Ionomer), with three values of cement layer thicknesses (20, 40, and 60 mm) were investigated. Twenty-four case studies were reported within this research. Each case was analyzed under vertical and oblique loading at Palatal Cusp Tip and Central Fossa. Results: Linear static stress analysis was performed. The results of the model showed the superiority of 60 mm thickness cement layer over the other two thicknesses. Conclusions: Using thicker cement layer increase its lifetime, in addition to reducing the cortical bone Von Mises stress. While, the effect of cement layer thickness and type on spongy bone, is negligible.

Influence of implant-abutment angulations and crown material on stress distribution on central incisor: a 3D FEA

“…Using angulated abutments with different types of restorative materials to construct the overlaying crowns are significant factors in determining the amount and distribution of stresses loaded onto the superstructure and implant under functional forces 23 23 23 23 23 . Most FE models in dental researches [9][10]24 9-10,24 9-10,24 9-10,24 9-10,24 assumed perfect bond between assembled model components to simulate natural condition, in addition to assuming linear, static and isotropic material properties.…”

“…Complete osseointegration was assumed. In addition isotropic, homogenous, and linearly elastic materials' properties were fed into the finite element (FE) software based on previous studies [9][10][11]13 9-11,13 9-11,13 9-11,13 9-11,13 and manufacturer's information (Table 1).…”

Specificities of Molars Replacement by Implants Supported Crowns

“…It had only one drawback of increasing the possibility of peri-implantitis if excess were not well eliminated. 20 Versus, the screw retained prosthesis was more used last decades because it simplified retrieval of the supra structure. However occlusal screw holes can compromise occlusion and porcelain strength.Two screws in screw retained prosthesis also, reduce the possibility of preload stresses and screw loosening.…”

“…However occlusal screw holes can compromise occlusion and porcelain strength.Two screws in screw retained prosthesis also, reduce the possibility of preload stresses and screw loosening. 20,21…”

Management of Missing Second Premolar with Single-Tooth Implant using Flapless Surgery

“…It offers the potential for higher passivity placement of the crown. 8,9 CLINICAL REPORT AND PROCEDURE A 23 year old female patient, with agenesis of second premolar, was referred to the department of fixed prosthodontics after orthodontic treatment. She expressed her wishes for a minimally invasive treatment approach.…”