| Objective: To evaluate the long-term clinical effect of Straumann implants in therestoration of dentition defect and assess the effect of implant superstructure andsurrounding tissue stability of various clinical factors, which provided a reference forthe usage and maintenance of Straumann implant system and the design of the the upperstructure, so as to improve its long-term clinical effects and success rate.Methods:130patients treated with191Straumann implants in YantaiStomatology Hospital Implant Center between January2008and december2008wereselected. The range of patients’ age was21-68years, mean46±9years old. The healingway was non-submerged. The upper parts of the structure are fixed restoration,including a single crown, two implants linked crown and two implant supportedthree-unit fixed bridge. All patients were recalled at6months、1year、2year、3year、4year respectively after restoration to receive clinical and radiological checks and theimplant survival rate, success rate, prosthesis success rate were recorded. Theprobability of the mechanical complications of different retention prosthetic werecompared; Peri-implant modified plaque index (mPLI)， gingival sulcus bleeding index(SBI), peri-implant probing depth (PD) were recorded to detect the changes of softtissue around the implant; The levels of implant marginal bone loss in4years wereanalyzed. To assess the clinical impact factors such as patient’s age, gender, implantsites, whether or not with bone graft surgery, restorative style of marginal bone level bymeans of multiple regression analysis.Results:24patients (31implants) of130patients were lost to follow due to thereplacement of the phone number or home relocation. The lost rate was18.46%; In the160implants which were analyzed,1implant was removed because of loosening,4implants experienced a history of peri-implantitis, implant survival and success rates of99.38%and96.88%, respectively; The remaining155implants fulfilled the success criteria. In four years, a total of22implants had mechanical complications, includingsuperstructure screw mobility, falling off of the crown, porcelain fracture of restorationsand the prosthesis success rate was85.81%. The risks of screw-retained andcement-retained mechanical complications were26.92%and7.77%, respectively. Allpatients in the follow-up period maintained a good oral hygiene status. The peri-implantmodified plaque index (mPLI) maintained at a lower level. The sulcus bleeding index(SBI) and peri-implant probing depth (PD) were within the normal range. All implantsappeared no obvious biological complications. The mean implant marginal bone losswas1.26±0.50mm after4years. Restorative techniques and surgical style had agreater impact on implant marginal bone level. The edge resorption levels of implantwith single crown, two implants linked crown and two implants supported three-unitfixed bridge were1.47±0.31mm,0.85±0.40mm,1.71±0.26mm, respectively. Theaverage bone resorption level in bone grafting implants was1.03±0.27mm, a littlehigher than that of those without bone grafting (0.90±0.27mm)。Conclusion:1Straumann implant system had a good clinical effect and could keepthe stability of soft tissue and bone around the implant in the long-term.2.The mechanical complications of screw-retained after restoration were more than thatof cement retention. If the binder is not removed clearly, the soft tissue might be led tobiological complications.3The bone resorption of bone grafting implants was greater than that of those withsufficient bone, and the marginal bone loss of the single crown and fixed bridge weregreater than two implants linked crown. |
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