title: The Maxillary Sinus Floor Elevation Using a Poly-L-Lactic Acid Device to Create Space Without Bone Graft: Case Series Study of Five Patients.
abstract: Maxillary sinus floor elevation using autologous or alloplastic bone grafting is often performed for implant treatment of maxillary molars; however, issues related to the donor site and complications such as infection have been reported. We performed maxillary sinus floor elevation using poly-L-lactic acid (PLLA) as a space-making material in patients with an insufficient bone mass (<3 mm) for simultaneous implantation between the alveolar crest and floor of the maxillary sinus and evaluated the newly formed bone. Conventional antrostomy of the maxillary sinus from the lateral wall was performed, and PLLA was placed on the floor of the maxillary sinus after elevating the sinus membrane. Six months after surgery, the bone mass and density were measured using quantitative computed tomography, and histological evaluation was performed. No complications were recorded. Radiological findings showed a bone-like radiopaque appearance, and histological examination revealed new bone formation in all patients. In cases with insufficient bone mass prior to simultaneous implant placement, this method of maxillary sinus augmentation allows for sufficient bone augmentation without bone grafting.
authors.affiliation: 1   Oral Implant Center, Department of Prosthodontic Dentistry for Function of TMJ and Occlusion, Kanagawa Dental University, Yokusuka, Japan.
authors.forename: Motohiro
authors.initials: M
authors.lastname: Munakata
authors.affiliation: 2   Oral Implantology, Faculty of Dentistry, Tokyo Medical and Dental University Hospital, Tokyo, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Tachikawa
authors.affiliation: 3   Oral Implantology, Showa University, Tokyo, Japan.
authors.forename: Yoko
authors.initials: Y
authors.lastname: Yamaguchi
authors.affiliation: 1   Oral Implant Center, Department of Prosthodontic Dentistry for Function of TMJ and Occlusion, Kanagawa Dental University, Yokusuka, Japan.
authors.forename: Minoru
authors.initials: M
authors.lastname: Sanda
authors.affiliation: 2   Oral Implantology, Faculty of Dentistry, Tokyo Medical and Dental University Hospital, Tokyo, Japan.|4   Oral Implantology and Regenerative Dental Medicine, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan.
authors.forename: Shohei
authors.initials: S
authors.lastname: Kasugai
mesh_terms: D016025:Bone Transplantation; D003758:Dental Implantation, Endosseous; D006801:Humans; D008443:Maxillary Sinus; D011091:Polyesters; D059546:Sinus Floor Augmentation
chemical_list: D011091:Polyesters; C033616:poly(lactide)
keywords: bone mineral density; maxillary molar implant; maxillary sinus floor elevation; poly-L-lactic acid; without bone graft