Abstract
Marginal bone loss (MBL) is a key factor in long-term implant success rate. Among the different factors that influence MBL, it is the different implant shoulder designs, such as scalloped or non-scalloped, which have been widely studied on screw retained but not on cemented retained implants. Thus, the aim of the present study was to evaluate the MBL around scalloped and non-scalloped cemented retained dental implants after 4 years of loading, in humans. A total of 15 patients were enrolled in the present study. A radiographic and clinical examination was performed after implant placement (T0) and after 4 years from it (T1). The results demonstrated a differential MBL (T1-T0) of 2.436 ± 1.103 mm and 1.923 ± 1.021 mm, respectively for test (scalloped) and control (non-scalloped) groups with a statistically significant difference between them. On the other hand, no statistically significant differences were found between the groups in terms of prosthetic complication and abutment decementation, whilst ceramic crowns chipping was shown in both groups. In conclusion, the use of a scalloped platform did not provide better results on the maintenance of MBL after 4 years follow-up. In this study, this probably was determined by multiple factors, among which was the subcrestal insertion of scalloped implants.
Highlights
The preservation of the crestal bone has become one of the main objectives in oral implantology [1,2].According to Albrektsson’s criteria, crestal bone loss around an implant occurs conspicuously at the time of implant insertion and up to 6 months, and to a smaller extent, in the following years after load [3].if this loss progresses uncontrollably, the biomechanical anchoring of the implant-supported prostheses can be drastically compromised [4,5]
It is a common consent that the preservation of “long-term” hard tissue around the dental implants is one of the most important aspects in the realization of an implant restoration, and that the progressive loss of bone substance drastically reduces the chances of survival of the dental implants under occlusal load [8,9,10]
It is the synergy of different conditions that mediates the progressive loss of the mineralized tissue around the dental implants, the loss of peri-implant bone is of multifactorial origin [6,11]
Summary
The preservation of the crestal bone has become one of the main objectives in oral implantology [1,2].According to Albrektsson’s criteria, crestal bone loss around an implant occurs conspicuously at the time of implant insertion and up to 6 months, and to a smaller extent, in the following years after load [3].if this loss progresses uncontrollably, the biomechanical anchoring of the implant-supported prostheses can be drastically compromised [4,5]. Even if the reaching of osseointegration of an implant is essential for gaining success, it does not necessarily reveal that this system will preserve its integrity during the patient’s life because a lot of aspects can influence the kinetics of mineralized tissue [6,7] It is a common consent that the preservation of “long-term” hard tissue around the dental implants is one of the most important aspects in the realization of an implant restoration, and that the progressive loss of bone substance drastically reduces the chances of survival of the dental implants under occlusal load [8,9,10]. Among the causes of this phenomenon there are: trauma during the surgical procedure; exposure of the implant during soft tissue healing; infections/inflammations during the healing period; bacterial colonization in the fixture-abutment gap with consequent inflammation
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