title: Analysis of Bone Height Changes after Maxillary Sinus Augmentation with Simultaneous and Delayed Placement of Dental Implants: A Clinical and Radiographic Study.
abstract: OBJECTIVE
  To retrospectively assess the changes of the vertical height of the maxillary sinus floor after augmentation with simultaneous and delayed placement of implants.
  
  
  METHODS
  In total, 38 patients with 76 implants were involved; vertical bone height of the sinus floor was radiographically measured at different stages including preoperation, immediately postsurgery, 6 and 12 months postsurgery, and 6 and 24 months postfunctional loading.
  
  
  RESULTS
  Sinus augmentation significantly increased vertical bone height of the sinus floor for both the simultaneous and delayed groups. The survival rate was 100% in the simultaneous group and 95.46% in the delayed group. For simultaneous placement, the vertical bone height of the sinus floor at 6 and 12 months postsurgery was significantly less than that immediately postsurgery. For both groups, augmented bone height of the sinus floor showed significant decrease from 6 months to 24 months postfunctional loading. The mean value of final bone augmentation was 5.85 mm for simultaneous placement and 5.80 mm for delayed placements.
  
  
  CONCLUSIONS
  Sinus augmentation with simultaneous and delayed placement of implants led to similar survival rates and bone augmentation. Resorption of augmentative bone was evident at 24 months postfunctional loading in both cases.
authors.affiliation: School of Life Sciences, Lanzhou University, Lanzhou, Gansu, China.|Department of Oral Implantology, School/Hospital of Stomatology, Lanzhou University, Lanzhou, Gansu, China.
authors.forename: Lihua
authors.initials: L
authors.lastname: Yin
authors.affiliation: Department of Oral Implantology, School/Hospital of Stomatology, Lanzhou University, Lanzhou, Gansu, China.
authors.forename: Zhanhai
authors.initials: Z
authors.lastname: Yu
authors.affiliation: Department of Oral Implantology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University.|Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, Guangdong, China.
authors.forename: Zhuofan
authors.initials: Z
authors.lastname: Chen
authors.affiliation: Department of Oral Implantology, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University.|Guangdong Provincial Key Laboratory of Stomatology, Guangzhou, Guangdong, China.
authors.forename: Baoxin
authors.initials: B
authors.lastname: Huang
authors.affiliation: Department of Oral Implantology, School/Hospital of Stomatology, Lanzhou University, Lanzhou, Gansu, China.
authors.forename: Kailiang
authors.initials: K
authors.lastname: Zhang
authors.affiliation: Department of Stomatology, Tangxia Hospital, Dongguan, Guangdong, China.
authors.forename: Ailing
authors.initials: A
authors.lastname: Zhou
authors.affiliation: Department of Stomatology, Lianyungang Hospital of Xuzhou Medical College, Lianyungang, Jiangsu, China.
authors.forename: Xiangxin
authors.initials: X
authors.lastname: Li
mesh_terms: D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D005500:Follow-Up Studies; D006801:Humans; D008437:Maxilla; D008443:Maxillary Sinus; D059546:Sinus Floor Augmentation
chemical_list: D015921:Dental Implants
keywords: Maxillary sinus augmentation; bone regeneration; bone substitutes; sinus bone resorption