title: Bucco-Lingual Crestal Bone Changes Around Implants Immediately Placed in Fresh Extraction Sockets in Association or not With Porcine Bone: A Non-Blinded Randomized Controlled Trial in Humans.
abstract: Background: The aim of the present randomized controlled clinical trial was to assess the bucco-lingual bone changes of implants immediately placed in fresh extraction sockets in association or not with porcine bone.  Methods: Forty patients were included in the present study, and were randomly assigned to the control (n = 20) and test (n = 20) groups. Each patient received a single implant placed into an immediate extraction site of a molar or a first upper premolar with a flapless approach. In the control sites no grafting material was placed, while in the tests a deantigenated collagenated bone substitute of porcine origin was used to fill the gaps between the implant and the extraction socket. The bucco-lingual bone width was measured at different time points: at the time of surgery (T0), at 90 days (T1), at 110 days (T2) and after 6 months of masticatory function (T3). The values were statistically analyzed between and within the treatment groups (p>0.05).  Results: All the implants were osseointegrated. Four control implants were excluded from the analysis due to the exposure of the coronal portion of the fixture. At T1, T2 and T3, statistically significant differences were found by comparing the mean width of the bucco-lingual bone between control and test groups. The mean values decreased during the observation period in both groups; statistically significant differences within controls were detected at T1, T2 and T3, and at T2 and T3 within tests.  Conclusions: The outcomes of present study suggested that porcine bone enabled to avoid bucco-lingual crestal bone changes in implants immediately placed in fresh extraction sockets.
authors.affiliation: Department of Medical, Oral and Biotechnological Sciences, Dental School, University of Chieti-Pescara, Chieti, Italy.
authors.forename: L P
authors.initials: LP
authors.lastname: Bottini
authors.forename: L
authors.initials: L
authors.lastname: Ricci
authors.forename: A
authors.initials: A
authors.lastname: Piattelli
authors.forename: V
authors.initials: V
authors.lastname: Perrotti
authors.forename: G
authors.initials: G
authors.lastname: Iezzi