Qualitative analysis of stress distribution in tooth-implant and implant-supported prosthesis by means of holography interferometry method

ABSTRACT

Natural teeth and dental implants cause non-uniform distribution of stress when connected in prosthesis. Understanding of biomechanical behavior is necessary for an adequate choice and construction of this type of rehabilitation. The purposeof this study was to compare the stress distribution between implant and tooth-implant-supported prosthesis under static load by means of holographic interferometry method. Tooth-implant and implant supported prosthesis were placed on osseointegrated implants in dog mandibles (Canis familiaris). So, the animals were sacrificed (in vitro test) and static load was applicated on the prosthesis, holograms were obtained by means of interferometry holographic method. A qualitative comparison of holograms was realized for both types of prosthesis. In the case of implant-supported prosthesis, the deflection fringes were observed in both abutment connections. For tooth-implant-supported prosthesis, only deflection fringes in the abutment-implant connection were observed. No fringes were observed in the dental abutment. The stress distributions in the implant-supported and tooth-implant prosthesis were homogeneous and non-homogeneous, respectively. The adequate choice of the prosthesis should be based on the analysis of all advantages and disadvantages of each type of prosthesis.