THREE DIMENSIONAL FINITE ELEMENT ANALYSIS OF BRANEMARK NOVUM(R)IMMEDIATE IMPLANT PROSTHODONTIC PROTOCOL / 대한치과보철학회지

ABSTRACT

Since the treatment of edentulous patients with osseointegrated implant was first introduced more than 30 years ago, implant therapy has become one of the most important dental treatment modalities today. Based on the previous experience and knowledge. Branemark Novum(R) protocol was introduced with the concept of simplifying surgical and prosthetic technique and reducing healing time recently. This protocol recommends the installation of three 5mm wide diameter fixtures in anterior mandible and the prefabricated titanium bars for superstructure fabrication. This study was designed to analyze the stress distribution at fixture and superstructure area according to changes of fixture number, diameter and superstructure materials. Four 3-dimensional finite element models were fabricated. Model 1 - 5 standard fixtures (13mm long and 3.75mm in diameter) & superstructure consisted of type IV gold alloy and resin Model 2 - 3 wide diameter fixtures (13mm long and 5.0mm in diameter) )& superstructure consisted of type IV gold alloy and resin Model 3 - 3 wide diameter fixtures (13mm long and 5.0mm in diameter) )& superstructure consisted of titanium and resin Model 4 - 3 wide diameter fixtures (13mm long and 5.0mm in diameter)& superstructure consisted of titanium and porcelain A 150N occlusal force was applied on the 1st molar of each model in 3 directions-vertical(90degree)horizontal(0degree)and oblique (120degree). After analyzing the stress and displacements, following results were obtained. 1. There were no significant difference in stress distribution among experimental models. 2. Model 2,3,4 showed less amount of compressive stress than that of model 1. However, tensile stress was similar. 3. Veneer material with a high modulus of elasticity demonstrated less stress accumulation in the superstructure. Within the limits of this study.Branemark Novum(R) protocol demonstrated comparable biomechanical properties to conventional protocol.