title: Assessment of Marginal Bone Loss around Platform-Matched and Platform-Switched Implants - A Prospective Study.
abstract: The aim of the present study was to perform a software-assisted radiographic assessment of the effect of platform-switching on marginal bone loss (MBL) around dental implants. Forty patients requiring a dental implant in non-grafted partially edentulous mandibles were enrolled and categorized into implants receiving a platform-matched abutment (control group) or implants with a platform-switched abutment (test group). Standardized digital periapical radiographs were taken at the time of implant placement (T0), at implant loading (T1) and 1-year after functional loading (T2). Software-assisted radiographic assessment of the MBL horizontal, vertical and area changes was performed and compared between time intervals (T1-T0, T2-T1 and T2-T0). Mean radiographic horizontal MBL (hMBL) and vertical MBL (vMBL) from implant placement to 1-year after implant loading (T2-T0) were significantly increased around platform-matched when compared to platform-switched abutments (1.04 mm vs 0.84 mm, p<0.05) and (0.99 mm vs 0.82 mm, p<0.05), respectively. Additionally, bone loss area (BLa) was greater (0.77 mm2 vs 0.63 mm2; p<0.05) for platform-matched compared to platform-switched abutments. Platform-switching has a positive impact upon the amount of bone modeling after loading implants with internal hexagon connection.
authors.affiliation: Department of Prosthodontics, Dental School, USP - Universidade de São Paulo, SP, São Paulo, Brazil.
authors.forename: Newton
authors.initials: N
authors.lastname: Sesma
authors.affiliation: Department of Periodontics and Oral Medicine, University of Michigan School of Dentistry, Ann Arbor, MI, USA.
authors.forename: Carlos
authors.initials: C
authors.lastname: Garaicoa-Pazmino
authors.affiliation: Department of Prosthodontics, Dental School, USP - Universidade de São Paulo, SP, São Paulo, Brazil.
authors.forename: Piero R
authors.initials: PR
authors.lastname: Zanardi
authors.affiliation: Department of Dental Materials and Prosthodontics, Institute of Science and Technology, UNESP - Univ Estadual de São Paulo, São José dos Campos, SP, Brazil.
authors.forename: Eliseo P
authors.initials: EP
authors.lastname: Chun
authors.affiliation: Department of Prosthodontics, Dental School, USP - Universidade de São Paulo, SP, São Paulo, Brazil.
authors.forename: Dalva Cruz
authors.initials: DC
authors.lastname: Laganá
mesh_terms: D000044:Dental Abutments; D015921:Dental Implants; D006801:Humans; D010024:Osteoporosis / Q000503:physiopathology*; D011446:Prospective Studies
chemical_list: D015921:Dental Implants