title: Influence of preservation of the alveolar ridge on delayed implants after extraction of teeth with different defects in the buccal bone.
abstract: Our aim was to evaluate the influence of preservation of the alveolar ridge on delayed implants with different defects in the buccal bone. We enrolled 60 patients who had one posterior mandibular tooth extracted. Cone-beam computed tomography (CT) was used to measure the buccal bone defects in the alveolar ridge before the tooth was extracted (level A=3 to 5 mm, and level B=more than 5 mm). After the tooth had been extracted, the socket either had the alveolar ridge preserved (trial group) or it was left to heal spontaneously (control group). The changes in the dimensions of the alveolar ridge from preoperatively to 6 months postoperatively were evaluated by cone-beam CT. Suitable implants were inserted 6 months later, and their length and diameter recorded. The implant stability quotient was evaluated for the following 3 months. The dimensions of the bone in the alveolar ridge in the trial group were significantly less than those in the control groups in both levels. Fifty-seven patients required implants (except 3 in level B in the control group). There were more longer and wider implants in the trial group than in the control group in Level B. 3 months after implantation, there were no significant differences in implant stability quotients between the groups, though in the control group, Level B, the mean (SD) value was 69.50 (1.00) while in the other groups values were all above 70 at 3 months. We conclude that when the defect in the buccal bone was more than 5mm, the alveolar ridge preservation demonstrated a remarkable effect in preserving the alveolar ridge dimension and delayed implantation.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Lanzhou General Hospital, Lanzhou Command of Chinese People's Liberation Army, Lanzhou, Gansu, 730050, China.
authors.forename: Chaoyuan
authors.initials: C
authors.lastname: Pang
authors.affiliation: State Key Laboratory of Military Stomatology, Department of Oral Surgery, School of Stomatology, The Fourth Military Medical University, Shaanxi, 710032, China. Electronic address: yxding@fmmu.edu.cn.
authors.forename: Yuxiang
authors.initials: Y
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Military Stomatology, Department of Oral Surgery, School of Stomatology, The Fourth Military Medical University, Shaanxi, 710032, China. Electronic address: hukaijin@fmmu.edu.cn.
authors.forename: Kaijin
authors.initials: K
authors.lastname: Hu
authors.affiliation: State Key Laboratory of Military Stomatology, Department of Oral Surgery, School of Stomatology, The Fourth Military Medical University, Shaanxi, 710032, China.
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Military Stomatology, Department of Oral Surgery, School of Stomatology, The Fourth Military Medical University, Shaanxi, 710032, China.
authors.forename: Ruifeng
authors.initials: R
authors.lastname: Qin
authors.affiliation: State Key Laboratory of Military Stomatology, Department of Oral Surgery, School of Stomatology, The Fourth Military Medical University, Shaanxi, 710032, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Hou
mesh_terms: D000539:Alveolar Process; D054893:Cone-Beam Computed Tomography; D015921:Dental Implants; D006801:Humans; D014081:Tooth Extraction; D020390:Tooth Socket / Q000601:surgery; D015050:Zygoma
chemical_list: D015921:Dental Implants
keywords: Alveolar ridge preservation; Bone graft; Buccal bone defect; Delayed implant; Implant stability.