IADR Abstract Archives
Retrospective Study of Single Implants: Survival, Prosthodontic Complications And Failures.
Objectives: Few clinical studies exist on new generation implant designs and abutment connection designs for partially edentulous patients. The treatment course of 222 implants from surgery to prosthodontics to recall from November 2009 to August 2013 in an implant specialty team practice was studied.
Methods: Electronic patient charts were reviewed for chart notes, radiographs, implant identification, clinical photographs, laboratory prescription and recorded on a spread sheet. Implant designs and abutment-implant connection designs placed were: Nobel Biocare: Branemark (BRMK)- external hex (HEX); NobelActive (ACT)- conical (CON); NobelReplace (REPL)- trilobe (TRI) or -CON. AstraTech: Osseospeed (ASTR)- CON. Southern Implant: (SOU) and -HEX or –TRI. Treatment planning-surgical placement goal was always screw-retained prostheses.
Results: Distribution of 222 implants by location: MaxAnterior-22%, MaxPremolar-22% , MaxMolar-12%, MandAnterior-2% , MandPremolar-15%, MandMolar-27%. Distribution of system designs (Anterior/ Posterior): BRMK-HEX- 3/40; ACT-CON- 27/74; REPL-TRI-0/20; REPL-CON-1/21; AST-CON-22/5; SOU-HEX-0/5; SOU-TRI-0/4. Screw-retained prosthesis by location (Maxillary/Mandibular): Anterior=37%/100%, Premolar=68%/86%, Molar=88%/86%. Screw-retained PFM 70% of restorations. Screw-retained custom zirconia abutment 17% of restorations.
Complications and Failures: BIOLOGIC: Five implant osseointegration failures, all posterior (2.3%). Early implant failure (before loading): ACT=1. Late failure: BRMK=1; ACT=2; REPL-TRI=1. MECHANICAL: Screw loosening: 6.8% of all implants; by implant-abutment system designs: BRMK=2; ACT=7; REPL-CON=6. Vertical implant fractures (leading to implant failure)= 2.3% occurring in ACT-CON=4; AST-CON=1. Anterior screw-retained custom designed zirconia abutments fractured: AST=1, ACT=3.
Conclusions: The biologic implant failure rate was 2.3%. Considerable prosthodontic complications or mechanical implant failures occurred predominately in the posterior areas. The ACT-CON and REPL-CON connection exhibited significant mechanical complications with screw loosening. Two systems with a conical abutment connection had implant vertical fracture of the implants. The overall implant failure rate was 4.5%. The goal of screw-retained prostheses was achieved for 73% of the implants.
Methods: Electronic patient charts were reviewed for chart notes, radiographs, implant identification, clinical photographs, laboratory prescription and recorded on a spread sheet. Implant designs and abutment-implant connection designs placed were: Nobel Biocare: Branemark (BRMK)- external hex (HEX); NobelActive (ACT)- conical (CON); NobelReplace (REPL)- trilobe (TRI) or -CON. AstraTech: Osseospeed (ASTR)- CON. Southern Implant: (SOU) and -HEX or –TRI. Treatment planning-surgical placement goal was always screw-retained prostheses.
Results: Distribution of 222 implants by location: MaxAnterior-22%, MaxPremolar-22% , MaxMolar-12%, MandAnterior-2% , MandPremolar-15%, MandMolar-27%. Distribution of system designs (Anterior/ Posterior): BRMK-HEX- 3/40; ACT-CON- 27/74; REPL-TRI-0/20; REPL-CON-1/21; AST-CON-22/5; SOU-HEX-0/5; SOU-TRI-0/4. Screw-retained prosthesis by location (Maxillary/Mandibular): Anterior=37%/100%, Premolar=68%/86%, Molar=88%/86%. Screw-retained PFM 70% of restorations. Screw-retained custom zirconia abutment 17% of restorations.
Complications and Failures: BIOLOGIC: Five implant osseointegration failures, all posterior (2.3%). Early implant failure (before loading): ACT=1. Late failure: BRMK=1; ACT=2; REPL-TRI=1. MECHANICAL: Screw loosening: 6.8% of all implants; by implant-abutment system designs: BRMK=2; ACT=7; REPL-CON=6. Vertical implant fractures (leading to implant failure)= 2.3% occurring in ACT-CON=4; AST-CON=1. Anterior screw-retained custom designed zirconia abutments fractured: AST=1, ACT=3.
Conclusions: The biologic implant failure rate was 2.3%. Considerable prosthodontic complications or mechanical implant failures occurred predominately in the posterior areas. The ACT-CON and REPL-CON connection exhibited significant mechanical complications with screw loosening. Two systems with a conical abutment connection had implant vertical fracture of the implants. The overall implant failure rate was 4.5%. The goal of screw-retained prostheses was achieved for 73% of the implants.