Influence of marginal bone resorption on stress around an implant – a three‐dimensional finite element analysis

Abstract

Average marginal bone resorption of about 1 mm after the first year of functional loading, which is followed by an annual loss of approximately 0.1 mm, has been reported in stable implants. However, finite element analyses on bone stress around implants have been limited to analysing the bone stress in the absence of any bone resorption. Thus, a three-dimensional finite element analysis was performed to compare the bone stresses in a non-resorption model with those in four models with bone resorption of two depths (1.3 and 2.6 mm) and types (horizontal resorption and angular defects). Axial and bucco-lingual forces were separately applied to the center of the superstructure and the maximum equivalent stress was calculated. The main tendencies of bone stress (highest stress concentration around implant neck, higher stresses under bucco-lingual than axial load, as well as in the cortical than cancellous bone) were the same in the non-resorption and resorption models. Bone stress distributions were similar in the non-resorption and horizontal resorption models, but differed from those in the angular defect models. Moreover, the changes of the bone stress values with resorption depth differed for the two resorption types. Thus, in FEA, accurate simulation of the marginal bone shape in the implant neck region is advisable.

Finite element analysis of the stress distributions in peri-implant bone in modified and standard-threaded dental implants

“…[7,18] Reported three-dimensional FEA of dental implants indicate that oblique forces are more destructive than axial forces, and they cause greater stress accumulation in the peri-implant bone than do axial forces. [20,21] Our study clearly showed that an increase in the loading force at an angle to the vertical axis increased the stress distribution in both the implant systems (Table 2), which is in agreement with previous reports. [1,3,18,22] For most single-molar implant-supported prostheses, bone loss occurs as a result of excessive occlusal loading.…”

Influence of microthreads and platform switching on stress distribution in bone using angled abutments

“…The clinical longevity of these implant systems relies on the mechanical integrity of the prosthesis and implant as well as the ability of peri-implant structures to withstand and positively adapt to the loading forces [31]. Excessive occlusal stress can cause bone resorption or even failure of the implant-bone interface, whereas lack of stress may lead to atrophy or even bone loss [22,32].…”

Influence of graft quality and marginal bone loss on implants placed in maxillary grafted sinus: a finite element study

“…In this study, we simulated the MBL progression levels by decreasing in increments of 1.3 mm. This level was equivalent to several implants of many implant systems [12].…”

“…Progression of MBL varied in depth (from 1.3 to 2.6 mm), as models were simulated for analysis (Fig. 2b, c) [12].…”

“…The intent of the study presented here was to investigate the biomechanical performance of bone around implant placed in maxillary grafted sinus based on the progression of MBL and variations in graft stiffness that could simulate the possible clinical scenarios related to several investigations [6,11,12,25]. The components in an osseointegrated implant placed in maxillary grafted sinus are complex geometry.…”