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

Natural teeth an dd ental implants cause non- uniform distribution of stress when connected in prosthesis. Understanding of biomechanica lb e- havior is necessary for an adequate choice and construction of this type of rehabilitation. The purpose of 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 (Ca- nis 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.