Comparison Of Peri-implant Bone Level In Augmented And Pristine Bone

Objectives:  The goal of this prospective study is to compare peri-implant crestal bone level changes around dental implants placed in augmented and pristine(non-augmented) bone.

Methods:  Patients with mandibular posterior partially edentulous ridge for dental implant supported prosthesis were included in this study. Residual alveolar ridge height and width were evaluated by Cone beam computed tomography (CBCT). Patients with insufficient amount of alveolar ridge were assigned to test group. Patients have sufficient residual alveolar ridge served as a control group. Guided bone regeneration (GBR) procedures were performed for the test group. Dental implants were placed at six months healing. For both groups, Customized bite record and grid combined with paralleling technique were used to obtain standardized digital radiographies at the time of implant placement (T1), one week before second stage procedure (T2), and implant supported prosthesis placement (T3).  Mesial and distal peri-implant crestal bone levels were calibrated and measured on radiographic. Comparisons of peri-implant crestal bone level between implants placed in augmented bone (test group) and in pristine bone (control group) were statistically analyzed. (p<0.05)

Results:  Preliminary results of the study showed that there is more peri-implant crestal bone loss in the test group than control group. The bone resorption was more prominent between the implant placement and second stage.

Conclusions: Implants in augmented bone tend to have more early peri-implant crestal bone resorption than in pristine bone. The grafted bone, at 6 month, may not have a sufficient maturation to be maintained without barrier membrane.