Comparative Study Of The Influnces On Peri-implant Tissues Caused By Different Dental Implant Systems

Comparative study of the influnces on peri-implant tissues caused by different dental implant systemsBackground:Implantology has been the fastest-growing and the most influential branch of stomatology. And it has become the best choice for the tooth-missing patients with the advantages of beauty, comfort, stability, no grinding of adjacent teeth and favorable biomechanical distribution. With the development of oral implantology, there have been more different implant systems used in clinical practice, such as ITI, 3I, BLB, Replace and so on. Many differences exist among dental implant systems, including the design of topography and structure, the method of surface treatment, the way to perform operation and the material of prosthetics. At the same time, more and more patients are not only searching for better funcional effects, but also seeking to perfect aesthetic effects.However, there are few researches on that issues. The studies on different implant systems mainly focus on the comparison of long-term success rate and the influences caused by different operation methods. It is important for us to investigate the influences on peri-implant soft tissues and bone tissues caused by the different systems and conclude how to select the most suitable system for various patients to get better functional and aesthetic effects.Objective: We are aimed to summarize the differences of stability among peri-implant soft tissues and bone tissues of different implant systems by researching the modification plaque index(mPLI), modification sulcus bleeding index (mBI),probing depth (PD), AST level in peri-implant crevicular fluid (PICF) and the bone loss of implants in the first year after operation. Natural teeth were selected as comparison. And the research could provide theoretical basis for the selection and design of implants, so as to improve clinical effects and long-term success of dental implants. Methods: 49 patients who accepted dental implantation in the stomatological hospital of Jilin University from January 2010 to December 2010 were selected and 75 implants were tested in all, including 35 3I implants, 22 ITI implants and 18 BLB implants. We measured the bone loss at the time of 3, 6, 9 and 12 months after operation, and tested modification plaque index (mPLI), modification sulcus bleeding index (mBI), probing depth (PD), AST level in peri-implant crevicular fluid (PICF) at the time of 1, 3, 6 and 9 months after the abutment connection. 32 natural teeth were used as comparison. Analysis of data was performed by software SPSS 17.0 and One-way ANOVA was used to compare the mean of indexes.Results:1. The bone loss of BLB system is more than those of 3I and ITI systems at the time of 3, 6 and 9months after operation, the result has significant differences(P<0.05).2. Only the mBI of BLB system is higher than that of natural teeth obviously in the sixth month after abutment connection(P<0.05), and the mBI of all three systems are higher than that of natural teeth obviously in the nineth month after abutment connection(P<0.05), but there are no significant differences among three systems(P>0.05).3. The PD of all three systems are higher than that of natural teeth obviously in the sixth and nineth month after abutment connection(P<0.05), but there are no significant differences among three systems(P>0.05).4. Only the AST level of BLB system is higher than that of natural teeth significantly(P<0.05), the results among 3I, ITI and natural teeth have no significant differences(P>0.05).5. The mPLI of all three systems are higher than that of natural teeth obviously at every testing time after abutment connection, but the results have no significant differences(P>0.05). Conclusions:1. The stability of peri-implant soft tissues and bone tissues of BLB system is not as good as that of 3I and ITI systems.2. All three systems have good clinical function during the first year after implantation.3.Compared with periodontal tissues of natural teeth, peri-implant soft tissue is weaker and easier to induce inflamation.