Radiographic and the Esthetic Outcome of Two Different Bone Grafting Techniques in Early Implant Placement

Overview

Total of 48 subjects were randomly assigned to treatment groups: UT Health Science Center at San Antonio Chi Mei Medical Center, Tainan, Taiwan Patients require a maxillary non-molar extraction site that is planned to be replaced by a dental implant and crown. This includes Straumann BL SLActive: Narrow (3.3mm) \& Regular (4.1mm) Crossfit implants in all available lengths. Patients were randomly selected to receive either FDBA (test) or Autogenous bone + DBBM (control/standard) for contour augmentation.

This comparative, randomized, prospective clinical study is designed to compare clinical outcomes and facial bone height and thickness of two different bone grafting techniques after augmentation in (Type 2) early implant placement. Human subjects who could potentially qualify with the said inclusion criteria will be evaluated and screened. 24 human subjects who qualify for the procedure will have a thorough evaluation performed after obtaining consent from the patient. All subjects will require extraction of maxillary teeth (incisors, canines, premolars), followed by early implant placement of the missing teeth after 4 to 8 weeks extraction. There will be two subject groups in this study in which the 24 human subjects in will randomly be placed by selecting the number "1" or "2" from a hat. 24 human subjects will be divided into two groups including 12 subjects using control group design and 12 subjects using test group design. 12 subjects will be placed randomly into Group 1 and will undergo the flapless extraction and early implant placement with GBR procedure using the control group design. 12 subjects will be placed randomly into Group 2 and will undergo the flapless extraction and early implant placement with GBR procedure using the test group design. During the implant placement visit after 4 to 8 weeks of extraction, patient will be asked to select a number from a hat. If the number showed "1" as a control group, autograft , BBM and collagen membrane will be used as GBR materials after implant placement. If the number showed "2" as a test group, FDBA and collagen membrane will be used as GBR materials after implant placement. Extraction sites will include maxillary teeth (11,12,13,14,15,21,22,23,24,25 according to FDI) having intact adjacent teeth. Implants placed for this study will have a SLActive surface, bone level design, Straumann NC 3.3mm or RC 4.1mm in diameter at all available implant lengths. Control group: early implant placement with autograft plus BBM (Bio-Oss, Geistlich Pharm AG, Wolhausen, Switzerland) plus two layers of collagen membrane (BioGide®). Test group: early implant placement with FDBA (Straumann Allograft GC®) plus two layers of collagen membrane (BioGide®). These procedures will follow the guidelines as described by Buser et al. (2008). Implant placements will follow standard protocols utilizing tapping and placement with the hand ratchet. A CBCT radiograph will be made during the screening visit to determine eligibility for the study and immediately following implant placement with GBR procedure to provide facial bone height and thickness measurements. The second CBCT procedure is not typically a standard of care procedure. After 12 months post loading healing time, the patient will receive another CBCT. This CBCT is also not a standard of care procedure but can accurately assess the amount of facial bone height and thickness maintained during the follow-up period.