Study Of Minimum Contact Fraction Of Bone-Implant Interface

Biomechanical influence play an implant role in success of dental implant, mechanical loading on dental implants largely determines the bone modeling and remodeling. Long-term success of implant seems to be related to stable bone metabolism and proper stress levels at bone-implant interface. If masticatory force on implant can produce stress at the bone-implant interface greater than the elastic limit of bone, then microfracture may occur. Overload has often been related to marginal bone loss. Successful implant therapy is dependent on direct contact of the implant with bone. Much of the literature examined the parameters of achieving direct bone contact on a predictable basis and varying anatomical and prosthetic conditions. Many other studies examined the consequences of direct contact of bone with the implant. One difficulty in this area was the absence of information to allow a determination of how much bone-to-implant contact is clinically necessary or is, in fact, optimal.In order to find the minimum bone contact ratio (BCR_min) at bone-implant interface of clinically successful implant, to investigate influence of factors such as quality and quantity of bone, elastic modulus, shape, diameter, length of implant, and direction of functional loading on BCR_min, we designed several models including the 3.75mm wide, 11mm length single screw type implant as standard. Variables such as quality and quantity of bone, elastic modulus, shape, diameter, length of implant, and direction of functional loading, the minimum contact fraction, stress distribution, and deflection of implant were analyzed on each model by three-dimensional finite element method. According our experiments, the results shown that: 1. It requires at least 45.95-69.93% direct contact between bone and implant surface to ensure functional loading in case of single standard implant. 2.A Strong correlation is predicted between bone quality and minimum bone contact ratio, BCR_min was to increases with decreases of either the...