Ankylos种植系统在前牙美学区种植修复体会

目的：应用Ankylos系统种植修复于前牙,观察其临床疗效。方法：选取36例前牙缺失的患者,采用直径为3.5mm标准A型Ankylos植体种植牙齿48颗,钴铬合金烤瓷冠修复。术后随访1周~18月,通过临床及X线检查,观察种植体周围牙龈组织的健康状况以及修复体与基台的稳定性,调查患者主观满意度,进行分析与评价。结果：全冠修复后,1枚植体上部基台因角度较大而转动、1颗烤瓷冠崩瓷外,其余均稳定牢固,无种植体周围炎及基台松动情况,术后1年内骨吸收小于1mm,患者主观满意率高,成功率97．8％。结论： Ankylos 种植系统应用于治疗前牙缺失成功率较高,并可获得较好的修复及美学效果。     

短种植体(≤6 mm)在萎缩后牙区5~7年疗效的回顾性研究

目的:评估短种植体(≤6 mm)在萎缩后牙区的长期临床疗效。方法:选取2009年1月~2012年1月南昌大学第四附属医院口腔科接受种植治疗的患者17例,共植入33枚Bicon植体(植体长度≤6 mm),观察期60~84个月不等,观察并记录边缘骨吸收量、种植体存留率及并发症。结果:在观察期内,33枚植体有1枚脱落,种植体存留率为97.0%,种植体修复完成60~84个月内种植体近远中骨吸收水平分别为(-0.74±0.05)mm、(0.05±0.07)mm,种植体近、远中边缘骨高度与修复后即刻比较差异均无统计学意义(P>0.05)。结论:在5~7年观察期内,短种植体(≤6 mm)应用于骨量不足的萎缩后牙区,其存留率及骨吸收水平与常规种植体无差异,可获得良好的中远期疗效。     

锥形锁柱种植体应用于牙周病患者后牙即刻种植的临床回顾性研究

目的: 比较锥形锁柱种植体在慢性中重度牙周炎患者行后牙区即刻种植和延期种植2种种植方式的短期临床疗效。方法: 收集2015年1月~2015年12月接受种植修复的26例慢性中重度牙周炎患者,共植入种植体52枚,其中即刻种植组(A组)28枚,延期种植组(B组)24枚,术后3~6个月完成冠修复,修复后追踪观察时间(14.4±2.3)月,观察种植体存留情况、修复后种植体周围骨吸收量和调查患者满意度。结果: 即刻种植组1枚植体因感染取出,延期种植组失败0枚,存留率分别为96.4%和100%;修复后1年实验组和对照组的种植体近中边缘骨吸收分别为(0.027±0.340) mm和(0.024±0.292) mm,远中边缘骨吸收分别为(0.011±0.252) mm和(-0.002±0.360) mm;2组患者总体满意度较高,上述差异均无统计学意义(P>0.05),观察期内存留的种植体正常行使功能,种植体周围软组织健康状况良好。结论: 慢性中重度牙周炎患者经过完善的牙周系统治疗后,在牙周状况良好的条件下,应用锥形锁柱种植体进行后牙区即刻种植,与延期种植在短期内临床效果相当。     

Ankylos种植系统在前牙区的临床应用及效果评价

目的:探讨Ankylos种植系统修复部分前牙缺失患者的短期临床效果和优点.方法:应用Ankylos种植系统对19例部分前牙缺失患者进行即刻或延期种植,部分采用一次手术直接安装愈合基台,部分直接安装基台并进行即刻修复,共植入30颗种植体.均采用金属烤瓷冠修复.通过临床检查及X线检查,评估种植体周骨高度丧失情况及牙龈乳头充填情况.结果:观察12-18个月,除一颗即刻修复的种植体植入1个月失败后,其余29颗种植体均稳固无松动,种植修复临床效果满意.修复完成1年后边缘骨吸收为0.16(-0.10-0.57)mm;按Jemt牙间乳头分类,本组47个位点中达I度7个位点,Ⅱ度29个位点,Ⅲ度11个位点.结论:Ankylos种植系统应用于前牙区其操作简单可靠,短期临床效果满意,并可减少种植体边缘骨吸收,促进种植修复的美学效果.     

平台转换种植体在上颌前牙区的临床应用

目的 评价平台转换种植体在上颌前牙区的应用效果,探讨平台转换技术对种植体周围组织的影响.方法 上颌前牙区单牙种植患者55例共60枚,分为2组,平台转换组25例,共28枚Ankylos系统种植体;平齐对接组30例,共32枚Nobel Replace系统种植体.分别于完成修复后1年和2年,观察种植体周围骨组织情况,计算红色美学得分(pink esthetic score,PES),比较2组种植体边缘骨组织和周围软组织的变化.结果种植体修复1年后,平台转换组种植体边缘骨变化量为(-0.41±0.36)mm,PES为10.43±1.37,平齐对接组种植体边缘骨平均变化量为(-1.77±0.54)mm,PES平均值为9.21±0.97;2年后,平台转换组骨变化量为(-0.55±0.33)mm,PES为10.32±1.21,平齐对接组边缘骨平均变化量为(-1.82±0.61)mm,PES为9.16±0.95.修复后1、2年,2组的种植体周围边缘骨吸收量和PES差异均具有统计学意义.结论 平台转换种植体在上颌美学区单牙种植修复能更有效保留周围骨组织及具有更佳的美学效果.     

Astra锥形种植体在上颌窦穿牙槽嵴顶提升术中的短期效果评价

目的 ：观察Astra锥形植体在上颌窦穿牙槽嵴顶提升术中的短期临床疗效。方法 ：纳入2019年3月—2019年9月40例上颌后牙缺失、需行上颌窦穿牙槽嵴顶提升术的患者，剩余骨高度为2～8 mm。于缺牙区植入Astra锥形种植体，术后4个月完成上部结构修复。观察种植体留存率、种植体稳定性、种植体边缘骨吸收以及上颌窦成骨量。采用SPSS 19.0软件包对数据进行统计学分析。结果：随访期内，40例患者共植入44颗种植体，种植体1年留存率为100%。术后即刻测量的ISQ值为67.55±8.07，初戴时ISQ值为79.62±5.08，随访期间ISQ值平均变化值为12.07±5.86。种植体周围边缘骨吸收(0.32±0.29) mm，术后至12个月间平均上颌窦成骨量(1.06±0.4) mm。未发现机械并发症。种植体周围探诊深度均值为(3.2±1.51) mm，探诊出血率为(11.36±4.28)%，改良菌斑指数均值为1.23±0.43。结论：Astra锥形植体在上颌窦穿牙槽嵴顶提升术中能够获得良好的临床效果，但仍需更长随访时间的研究验证。     

窄直径种植体在下颌前牙区临床疗效的回顾性研究

目的:回顾性分析下颌前牙区应用窄直径种植体的临床疗效。方法:纳入下颌前牙区植入窄直径种植体的患者149例,种植体227颗。检查指标包括种植体存留率、并发症情况、美学评分及边缘骨吸收。结果:窄直径种植体存留率为98.68%;随访期间软硬组织情况较好,美学效果均较为满意;种植体边缘骨吸收量为(0.28±0.41) mm,口腔卫生情况、牙周病及吸烟是影响骨吸收的风险因素。结论:下颌前牙区应用窄直径种植体的临床效果理想可靠。严格控制风险因素、合理制定种植方案、定期随诊维持疗效是成功的关键。     

异种脱细胞真皮基质在种植外科中应用初探

目的 评估国产异种脱细胞真皮基质在骨劈开同期植入种植体引导骨组织再生的近期临床疗效.方法 选择上颌前牙种植区牙槽嵴顶、中部宽度1.5-3.5 mm(平均骨宽度3.0 mm)的患者64例.21例(空白对照组)采取超声骨刀行骨性切口、骨劈开同期植入25枚种植体,在种植体与骨壁之间植入人工骨代用品;43例(试验组)骨劈开同期植入50枚种植体,并植入人工骨代用品和覆盖国产异种脱细胞真皮基质.对两组的新骨生长情况进行临床及X线检查分析.结果 术后3个月,试验组种植体经X线检查显示,50枚种植体骨结合良好,种植体封闭螺帽上方有骨密度增高影像.Ⅱ期手术时试验组的生物膜已明显吸收较薄,新骨完全覆盖种植体;空白对照组种植体唇侧均有少量骨吸收,其中7例7枚种植体骨吸收较明显,种植体颈部唇侧部分暴露.对两组骨劈开术中、术后3个月行Ⅱ期手术时的牙槽嵴顶唇腭向骨宽度、垂直向骨高度的改建情况进行检测和统计学分析,试验组的新骨生成量(唇腭向骨宽度5.8±1.02 mm;垂直向骨高度0.8±0.39mm)均明显高于空白对照组(唇腭向骨宽度5.1±0.87 mm;垂直向骨高度增加-0.5±0.31mm,P<0.05).结论 国产异种脱细胞真皮基质能有效阻挡软组织的长入,屏障时间能满足临床需求,可有效引导骨劈开同期植入的种植体周围的骨组织再生.     

上颌前牙早期种植的临床应用

目的 探讨上颌前牙缺牙区行早期种植的效果及技术要点。方法 对22例上前牙病变患者行微创拔牙,术后4~8周共植入种植体28枚,其中10例伴骨缺损者采用GBR技术,同期植入人工骨粉及胶原膜,严密关闭切口,3~6个月后行永久修复。随访时间6~27个月（平均12个月）。在此期间检查种植体稳固性,牙龈及龈乳头外形;X线检查种植体骨结合情况;评价临床成功率及美学修复效果。结果 28枚种植体存留率为100%。牙龈形态良好,色泽正常,无明显探诊出血,与对侧同名牙牙龈形态基本对称。复查X线片种植体颈部边缘骨吸收均小于1.5 mm。结论 上前牙早期种植应用于临床方法可行,修复缺牙美学效果良好。     

种植体直径对下颌覆盖义齿植体边缘骨吸收影响的3年回顾性研究

目的 研究窄颈和常规颈种植体支持的下颌球帽覆盖义齿边缘骨吸收 (MBL)、机械并发症及患者满意度。方法覆盖义齿的设计方案为下颌无牙颌植入2枚种植体,上部附着体为非夹板式球帽结构。共分为2组：① 窄颈种植体(?=3.3 mm)为26例,52 枚种植体;② 常规颈种植体 (?=4.1 mm)为28例,54枚种植体。分别在佩戴覆盖义齿后的6个月、1年及3年,通过临床检查及影像学观察种植体周围软组织情况 (牙周袋深度、牙龈出血指数、菌斑指数及牙结石指数)、边缘性骨吸收（MBL）、修复并发症,并采用问卷调查患者满意度。结果 在3年的随访期内,108枚种植体均无松动脱落。窄颈和常规颈种植体组的平均MBL分别为（2.1±0.4）mm,（1.4±0.3）mm,两者差异具有统计学意义。窄颈和常规颈种植体组的维修频率分别为0.26、0.27次/（年?人）,患者满意度后者略高于前者,但上述两组数据无显著性差异。结论 3年的回顾性研究表明,在使用种植体支持下颌球帽覆盖义齿修复中,种植体的直径会对其边缘骨吸收产生一定影响。使用常规颈植体的边缘骨吸收少于窄颈植体,但两者机械并发症和患者满意度没有差异性。     

两种不同直径Ankylos种植体边缘骨吸收的比较研究

目的：比较3.5mm和4.5mm两种不同直径的Ankylos种植体用于修复单牙缺失的边缘骨吸收量。方法：临床选择50例单牙缺失患者,采用3.5mm和4.5mm Ankylos种植体各25例,行潜入式种植手术,Ⅱ期手术2周后,按照常规方法完成金钯合金烤瓷冠修复。术后随访,通过X线检查骨组织的吸收情况。比较3.5mm种植体和4.5mm种植体X线检查结果。义齿修复后的临床观察期为12个月。结果：全冠修复后,两组植体及修复体均未发生严重并发症,初期稳定性好,3.5mm种植体在修复即刻及修复后3、6、12个月的边缘骨吸收量分别为（0.53±0.46）、（0.58±0.42）、（0.64±0.40）、（0.78±0.35）mm,4.5mm种植体在修复即刻及修复后3、6、12个月的边缘骨吸收量分别为（0.33±0.24）、（0.35±0.26）、（0.41±0.28）、（0.51±0.29）mm。两组骨吸收量经检验存在显著性差异（P〈0.05）,均数排列为：3.5mm组（0.66mm）〉4.5mm组（0.42mm）结论：在Ankylos平台转换结构中,肩台的宽度越大,即种植体的直径越大,种植体边缘骨吸收量越少。在牙槽骨宽度足够的情况下,尽可能选择宽径种植体。     

A Retrospective Study on 287 Implants Installed in Resorbed Maxillae Grafted with Fresh Frozen Allogenous Bone

Background: Several studies have been performed to evaluate the clinical outcome of implants inserted into maxillae grafted with autogenous bone but few reports have focused on maxillae grafted with fresh‐frozen allogenous bone (FFAB). Purpose: The purpose of this study is to retrospectively evaluate the clinical outcome of implants installed in resorbed maxillae augmented with FFAB. Materials and Methods: A total of 69 patients whom had been treated with FFAB grafts to their maxillae and implant placement 4 to 6 months later were retrospectively evaluated. Edentulism was total and partial in 22 and 47 cases, respectively. A total of 287 implants of various systems had been used. A life table analysis was performed. Marginal bone loss was calculated in radiographs. Results: Five of the 287 implants were lost, giving a survival rate (SVR) of 98.3% over a mean follow‐up time of 26 months. The marginal bone resorption at the implants was 1.68 mm (SD = 0.44) after 1 year and 1.85 mm (SD = 0.98) after 4 years. The cumulative success rate based on defined criteria was 96% in the first year but decreased to 40% at 4 years because of marginal bone loss. The Kaplan–Meier algorithm demonstrated a better outcome for female patients, removable dentures, and total edentulism. No differences were detected among diameters, lengths, and implant site. Conclusion: Implants placed in FFAB showed a high SVR similar to that reported in previous studies on maxillae grafted with autogenous iliac crest bone. Although our data point to more marginal bone loss in partially edentulous patients and for fixed prosthetic restorations, the use of FFAB for reconstruction of the atrophic jaw prior to implant placement can be considered as a reliable alternative to autogenous bone.     

A 5-year longitudinal study of the clinical effectiveness of ITI solid-screw implants in the treatment of mandibular edentulism

PURPOSE: The aim of this longitudinal study was to gain 5-year clinical documentation of the 1-stage surgical technique in connection with ITI solid-screw implants used in the edentulous mandible. MATERIALS AND METHODS: One hundred patients with totally edentulous mandibles were treated with bar-retained overdentures supported by a total of 340 consecutively placed ITI solid-screw implants. The patients were followed at annual intervals for at least 5 years to evaluate implant success, longitudinal reactions of the peri-implant hard and soft tissues, and incidences of biologic and mechanical complications. RESULTS: During the trial period, a total of 4 implants failed, all prior to loading, and 51 implants were lost to follow-up, resulting in a cumulative survival rate of 98.8% after 5 years of functional service. The success analysis included additional strictly defined events (either "first occurrence of marginal bone loss > or = 4 mm" or "first occurrence of pocket depth > or = 4 mm" and "first occurrence of crevicular fluid flow rate > or = 2.5 mm) and resulted in a cumulative 5-year success rate of 95.7%. The median marginal bone loss experienced between implant placement and prosthetic treatment was 0.5 mm, followed by an annual bone level change of 0.1 mm for the functional period of 5 years. The increasing incidence of remarkable plaque deposits from 19% to 50% represented the difficulties of the patients in maintaining a high level of oral hygiene, particularly for the lingual surfaces. Sulcus Bleeding Index, probing depth, attachment level, and crevicular fluid flow rate were used to describe the health of the peri-implant soft tissues and remained almost within acceptable standards. DISCUSSION: Survival and success rates of implants, amount of marginal bone loss, and periodontal indices of peri-implant soft tissues were consistent with those reported in the literature regarding implants with the submerged healing concept. CONCLUSION: With a cumulative survival rate of 98.8%, a cumulative success rate of 95.7%, and a median marginal bone loss of 0.5 mm during the healing period, followed by an annual rate of 0.1 mm after loading, non-submerged ITI solid-screw implants confirm the good clinical outcome of implant-supported treatment concepts for the rehabilitation of totally edentulous patients in a medium-term perspective.     

Fixed Implant‐Retained Rehabilitation of the Edentulous Maxilla: 11‐Year Results of a Prospective Study

Objectives: The aim of the present study was to assess long‐term survival and success rates of implants in the edentulous maxilla restored with an implant‐supported fixed prosthesis. Materials and Methods: Seventeen edentulous patients received six to eight implants and implant‐supported fixed prostheses by one surgeon. Yearly recalls were conducted by two examiners over a period of 11 years. Survival and success rates (biological complications) were determined; marginal bone loss was examined radiographically. Furthermore, microbiological tests as well as test for interleukin‐1 composite genotype were assessed and potential risk factors were evaluated. Results: After a mean time of 11.26 years, 15 patients of 17 could be reexamined. Out of 94 implants, three were lost in one patient. Mean marginal bone loss reached 0.88 mm, two patients (at seven implants) showed bone loss of ≥3.2 mm. Survival rate of implants reached 96.8%. Success rates on implant level hit 92.6% according to the criteria of Albrektsson and colleagues and 83.0% in accordance with Karoussis and colleagues. One prosthesis had to be renewed. Conclusion: Within the limitation of this study, restoration of the edentulous maxilla with an implant‐supported fixed prosthesis represents an effective tool for rehabilitation over a period of 11 years.     

Ankylos种植系统多牙固定修复短期临床疗效评价

[摘要] 目的 评价Ankylos种植体用于固定修复多牙缺失的临床应用效果。方法 临床选择21例多牙缺失患者完成An-kylos 68枚种植体进行潜入式种植手术,部分骨量不足的患者,同期使用膜引导骨再生术、上颌窦内提升术或上颌窦外提升术。Ⅱ期手术两周后,按照常规方法完成金钯合金烤瓷冠修复。术后随访,检查修复体与基台的稳定性,种植体周围牙龈组织的健康状况;通过X线检查观察骨组织的吸收情况及基台的密合程度;调查患者对种植义齿咀嚼、美观功能的主观满意度。种植后及义齿修复后的临床观察期为1～2.5年。结果 冠桥修复后,1例患者的1枚种植体在种植修复后1个月时,发生种植体周围炎;1例在修复后1年烤瓷冠崩瓷;其余种植体均稳定,无明显骨吸收,种植体基台界面密合,牙龈组织健康。按种植成功标准,修复成功66枚,成功率97.1%;失败2枚,占2.9%。结论 Ankylos种植体用于多牙缺失的固定修复具有良好的临床效果。     

不同种植深度Ankylos种植体边缘骨吸收的对比研究

目的：对比分析后牙区不同种植深度种植体边缘骨吸收差异。方法：选择2010年1月～2014年1月间后牙区接受Ankylos系统种植修复患者72例,共植入113颗种植体,根据种植深度分为3组：0 mm组（平齐骨缘）,1 mm组（骨缘下1 mm）,2 mm组（骨缘下2 mm）。随访24～66个月,测量种植体边缘骨吸收量,并评估种植体功能负载2年后颈部边缘骨水平的变化及3组之间的差异。应用SPSS 13.0软件包对数据进行统计学分析。结果：3组不同种植深度的种植体周围骨质年均骨吸收量之间对比,差异无统计学意义（P＞0.05）。功能负载2年后,0 mm组边缘骨水平稳定于种植体平台水平或以上的位点占28.6％,1 mm为52.3％,2 mm为70.4％,3组对比差异有统计学意义（P﹤0.05）。结论：在平台转移设计的Ankylos系统,种植深度低于牙槽嵴水平有利于种植体周围骨组织稳定。     

Success of dental implants placed in intraoral block bone grafts

BACKGROUND: The purpose of this study was to evaluate the survival and success of dental implants placed in alveolar bone following augmentation using intraoral block bone grafts. METHODS: A consecutive retrospective study was conducted on patients who had onlay bone grafts for vertical or horizontal augmentations followed by dental implantation from 1999 to 2001. Files of 50 healthy patients who received 129 implants in augmented sites were reviewed. Implant survival, radiologic implant success (marginal bone loss), and complications were recorded. RESULTS: Follow-up from time of implantation ranged from 6 to 67 months (mean: 24.3 +/- 11.2 months). Ranges of implant widths and lengths were 3.25 to 4.7 mm and 10 to 16 mm, respectively. The overall survival rate was 96.9% (four implants were removed). Marginal bone loss around implants ranged from 0 to 3.3 mm (average: 0.22 +/- 0.45 mm). Only 5% of the implants presented marginal bone loss > or =1.5 mm over the follow-up time. CONCLUSIONS: Intraoral bone block graft surgery is a predictable operation for the use of dental implants. Implant placement in augmented areas presents high survival and radiologic success rates with minimal bone loss.     

Evaluation of a platform-switched Morse taper connection for all-on-four or six treatment in edentulous or terminal dentition treatment: A retrospective study with 1–8 years of follow-up

Background

The survival rate, marginal bone loss and soft tissue health of the Ankylos implants and the balanced base abutments in all-on-four or six implant restoration of edentulous or terminal dentition patients has not been reported in the clinical research.

Purpose

This retrospective study aimed to evaluate the Ankylos implants and the balanced base abutments in all-on-four or six implant restoration of edentulous or terminal dentition patients after 1–8 years of follow-up.

Materials and Methods

A retrospective study was conducted based on the medical records of 33 patients who received all-on-four or six treatments from April 2014 to May 2020. Four radiographic examinations [immediate postoperative (T0), definitive restorations (T1), 1–3 years after prosthetic restorations (T2), and more than 3 years after prosthetic restorations (T3)] were obtained to evaluate vertical bone height (VBH). We also calculated the survival rate and examined the condition of soft tissue with this implant system in edentulous or terminal dentition patients. Three-level linear model analyses were used to explore potential risk factors for VBH changes on the mesial and distal sides. The generalized linear model was used to analyze the influencing factors of BOP and plaque.

Results

A total of 218 implants were included in this study. The cumulative survival rate of the implants was 97.25% before the definitive prosthesis, 96.33% within 3 years of follow-up and 95.32% after more than 3 years of follow-up. The mean ± standard deviation (SD) bone losses of the VBH were 0.27 ± 0.05 mm (T1-T3) on the mesial side and 0.49 ± 0.06 mm (T1-T3) on the distal side. During 1–8 years of follow-up, the height and angle of the abutment (p < 0.001), the mandible implant site (p < 0.001), the length of the implant (p = 0.014 < 0.05) and age (p = 0.029 < 0.05) showed statistically significant effects on vertical mesial bone height (VMBH) and vertical distal bone height (VDBH). The risk of BOP among participants who brushed three times a day was lower than those who brushed less than three times. The plaque risk of short abutment height was higher than the long abutment.

Conclusion

The current study showed that the Ankylos implants with the balanced base abutments in all-on-four or six implants treatment is a viable and predictable option with a high survival rate and low marginal bone loss in edentulous or terminal dentition patients. VBH around the implants was strongly associated with the mandible implant site, abutment height and angle, the length of the implant and age. Moreover, teeth-brushing times and abutment height significantly affect soft tissue health.     

下颌后牙区短种植体联冠修复短期临床效果评价

目的 评估应用短种植体联冠修复下颌后牙牙列缺损的短期临床疗效。方法 选择2008年1月至2013年1月在中国医科大学附属口腔医院种植中心植入2枚种植体并用联冠修复下颌后牙牙列缺损的患者65例,共植入130枚种植体。其中,31例患者植入62枚短种植体（长度≤ 8.5 mm）作为短种植体组,34例患者植入68枚标准种植体（长度≥ 11.5 mm）作为对照组。记录并统计分析病例在手术当天及复诊时的相关临床资料,包括种植体累积成功率、生物机械并发症、边缘骨吸收、临床冠根比等。结果 两组各有2枚种植体失败;两组种植体累积成功率、并发症及边缘骨吸收比较差异无统计学意义（P > 0.05）;短种植体组临床冠根比显著大于对照组（P < 0.01）。结论 在严格控制适应证的情况下,对于骨量不足的患者应用短种植体修复下颌后牙牙列缺损能够取得理想的临床效果,同时可以降低手术风险,并减轻患者经济负担。     

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??Abstract??Objective To evaluate the short-term clinical effect of splinted short implants in the partly edentulous mandible of posterior regions. Methods Totally 65 patients??130 implants??who received short implants or standard implants to restore dentition defect in mandible of posterior regions during the period between January 2008 and January 2013 at the Implant Center of Hospital of Stomatology??China Medical University were selected??including 31 patients with 62 short implants??length ≤ 8.5 mm??as the short implant group and 34 patients with 68 standard implants??length ≥ 11.5 mm??as control group. Relevant clinical data was recorded and analyzed??such as cumulative success rate??biomechanical complications??marginal bone loss and Crown/Implant ratio. Results Two implants failed in both short implant group and control group. No significant differences in cumulative success rate??biomechanical complications and marginal bone loss were found between the two groups??P > 0.05??. The clinical Crown/Implant ratio in short implant group was significantly greater than that of the control group??P < 0.01??. Conclusion In the case of strict control of indications??the application of short implants to restore edentulous mandible of posterior regions for those who had bone defect can achieve more satisfactory clinical results??and additionally reduce the operation risk and the economic burden of patients.