Chinese Journal of Oral Implantology

Survey the development of oral implantology in China, "view the sea" together, cherish good times, and reach another peak ——Written interview of Liu Baolin by the Chinese Journal of Oral Implantology

Editorial Board of Chinese Journal of Oral Implantology

2022, 27(4): 199-203. DOI: 10.12337/zgkqzzxzz.2022.08.001

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Expert consensus on complications of sinus floor elevation：benign paroxysmal positional vertigo (first edition)

Chinese Society of Oral Implantology

2022, 27(4): 204-207. DOI: 10.12337/zgkqzzxzz.2022.08.002

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Sinus floor augmentation is a predictable rehabilitation method for the atrophic posterior maxilla but having highly technical sensitivity and many complications. Benign paroxysmal positional vertigo (BPPV) is a rare complication of osteotome sinus floor elevation. It usually occurs after the maxillary sinus floor is elevated through the alveolar ridge. The relevant literature is generally cases reports. At present, there is a lack of guidelines or consensus on complication management at home and abroad. Therefore, the Oral Implant Professional Committee of the Chinese Stomatological Association organized experts from major universities in China to discuss and draft this consensus, aims to provide clinicians with practical and feasible measures for preventing, diagnosing, and treating complications.

Clinical application of three-dimensional printed digital customized titanium mesh in guided bone regeneration for alveolar bone reconstruction

Wang Tingting, Wang Feng, Wu Yiqun

2022, 27(4): 208-216. DOI: 10.12337/zgkqzzxzz.2022.08.003

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Severe alveolar bone defects seriously affect dental implant placement and its long-term performance. Guided bone regeneration（GBR）as a reliable technique is able to achieve predictable bone augmentation. Three-dimensional printed digital customized titanium mesh is a new technique to obtain alveolar bone augmentation.For patients with severe alveolar bone defects, the preoperative examination is performed, the information of alveolar and dentition is obtained by radiographic examination and oral scan or model scan respectively,then the implants position is placed according to the principle of prosthetic-driven implant placement. The extent of bone augmentation and the shape of customized titanium mesh are designed with software, and then the digital customized titanium mesh is manufactured with 3D printing technology. The application of customized titanium mesh is conducive to reconstruct the three-dimensional shape of alveolar ridge precisely,and individually. The aim of this article is to summarize pre-opreative evaluation of patients, the key points of the design, clinical application and precautions of customized titanium mesh, in order to further promote its wide and safe application in clinical practice.

Application of lag screw technique in alveolar bone block grafting

Yang Dezhao, Xu Yingjie, Tang Zhengting, Ma Yuxiao, Li Guangcheng, Meng Fanwen

2022, 27(4): 217-223. DOI: 10.12337/zgkqzzxzz.2022.08.004

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Objective To evaluate the application effect of lag screw technique in alveolar ridge bone block grafting. Methods Thirty-six patients with Terheyden 2/4 type severe bone deficiency in the horizontal direction requiring implant restoration. 15 males and 21 females, aged 18~54 years, with the narrowest alveolar ridge width in the range of 1.2 mm~4.0 mm. Using lag screw technique, autologous bone block is fixed to the graft area, surrounded by deproteinized bovine bone mineral（Bio-Oss）, covered with acellular porcine pericardium （BONANGA）. Reduce tension and suture wounds. Observe and record the stability of the bone block, including the occurrence of bone fragment splitting, rotation and displacement, as well as postoperative wound healing. CBCT was used to measure the width and height of the alveolar ridge before surgery, immediately after surgery, 3 months and 6 months after surgery. SPSS 21.0 was used for statistical analysis of the measurement data. Results All the 36 cases of autologous bone grafts were stable, and there was no bone fragment splitting. The wound healed well in the bone graft area. In 2 cases, the wound of the chin donor site was dehiscent during the healing process, and gradually healed after dressing was changed, and the rest did not have adverse reactions requiring special treatment. The preoperative average buccolingual alveolar width was（4.20±1.10）mm, Immediately after the operation, 3 months and 6 months after the operation, the average buccolingual alveolar width was（9.60±1.28）mm, （8.81±1.36）mm and （8.25±1.28）mm, which were significantly different from those before the operation. Conclusion The application of lag screw technique in alveolar ridge bone block grafts is simple and effective, which is worthy of clinical promotion and application.

A clinical study on the effect of horizontal bone augmentation with collagen membrane fixation for guided bone regeneration

Pang Liping, Zhong Xinlan, Wang Weian, Li Shuigen

2022, 27(4): 224-228. DOI: 10.12337/zgkqzzxzz.2022.08.005

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Objective To measure and analyze the changes of hard tissue before and after guided bone regeneration in patients with moderate to severe alveolar bone defects. Methods Guided bone regeneration surgery using absorbable membrane fixed with pins was performed. And the bone graft with the xenograft bone plus autologous bone （about 50% each）were used in the surgery. CBCT (cone beam computed tomography) was performed before and after surgery. The data were registered by three-dimensional reconstruction, and the changes of bone width and alveolar bone volume at 2 mm and 8 mm from the alveolar crest before and after guided bone regeneration were measured. The results were statistically analyzed by paired t test. Results After guided bone tissue regeneration, the bone width from the crest of alveolar ridge at 2 mm increased from （5.59±3.82）mm to （11.75±4.65）mm; while the bone width at 8 mm increased from （7.72±3.32）mm to （13.58±4.26）mm. The difference in bone width increment was statistically significant (P<0.01), The difference in volume change of the alveolar bone was statistically significant (P < 0.01). Conclusion Guided bone regeneration surgery using absorbable membrane fixed with pins and xenograft combining autologous bone, has a good horizontal increment effect on the alveolar ridge with moderate to severe alveolar bone defect.

Comparison of implantation accuracy of four implantation methods in the posterior region of mandible: an in vitro study

Ma Yuxiao, Zhou Libo, Meng Fanwen, Yang Dezhao, Wang Zhaoyun, Duan Feng

2022, 27(4): 229-237. DOI: 10.12337/zgkqzzxzz.2022.08.006

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Objectives To compare the accuracy of implant placement using free-hand implantation (FH), surgical guide (SG), dynamic navigation (DN), and guide and navigation (SG with DN). Methods Using four different implantation methods, 192 implants were equally distributed into 48 identical mandibular models with bilaterally homologous tooth implantation sites. According to the preoperative cone beam computed tomography (CBCT) of the experimental model, the appropriate implantation position was planned, so that the four implantation methods used the same planning information for implant placement. Post-implantation CBCT was registered with preoperative planning data to measure post-implantation 3D deviation and parallelism. Results The accuracy obtained with computer-assisted implantation (CAIS) was significantly higher than that obtained with free-hand implantation (P<0.01), The three-dimensional deviation of the SG group and the DN group at crest were 0.63（0.29）（0.55~0.71）mm and 0.57（0.19）（0.52~0.63）mm, respectively; and the three-dimensional deviation at apex were 0.72（0.27）（0.65~0.80）mm and 0.62（0.20）（0.56~0.68）mm, the difference between the two groups was not statistically significant （P>0.05）; the deviations of the SG with DN group at crest and apex were 0.33 （0.13）（0.29~0.37）mm and 0.35（0.14）（0.31~0.39）mm, and the difference with other groups was statistically significant (P<0.05). When SG was used, the deviation in the horizontal direction at crest was smaller (SG and SG with DN groups); while when DN was used, the deviation in angle was smaller (DN and SG with DN groups). Conclusion CAIS can improve the accuracy of implantation, and the best accuracy can be obtained when the surgical guide and dynamic navigation are used in combination.

Research progress of socket-shield technique in immediate implantation

Zhang Ruiyuan, Zhong Weijian, Ma Guowu

2022, 27(4): 238-242. DOI: 10.12337/zgkqzzxzz.2022.08.007

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In the maxillary anterior region, as the contour of soft tissue depends on the shape of the underlying bone tissue, the absorption of alveolar bone after tooth extraction often leads to the collapse of the soft tissue, which seriously affects the aesthetic effect of implant restoration in the anterior region. Clinicians have proposed many methods to preserve the labial bone plate, among which the “Socket-shield Technique” can guarantee the blood supply of the labial bone plate during immediate implantation, thus avoiding the loss of labial alveolar bone. After reviewing the literature, this paper reviews the development history, basic research status, clinical research status, clinical application and aesthetic effect of this technology.

Clinical assessment of evaluating passive fit of implant-supported fixed prostheses

Guo Yongqing, Ma Yun, Yu Hao

2022, 27(4): 243-247. DOI: 10.12337/zgkqzzxzz.2022.08.008

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Passive fit is closely associated with the long-term success rate of implant-supported prostheses. Therefore, clinical assessment of passive fit is important in the implant therapy. Based on the current evidence, an absolutely passive fit cannot be obtained, and a certain level of misfit was considered to be clinically acceptable. Various methods are applied to assess the passive fit of prostheses, which are mainly divided into two aspects: passiveness and marginal fit. The screw resistance test could be used to assess passiveness. Regarding marginal fit, the following methods are available: alternate finger pressure, visual inspection, tactile sensation, radiographs, one-screw test and disclosing materials. Each assessment method has its advantages and limitations. This article briefly reviewed the definition of passive fit and the common clinical assessment methods to provide references for clinical diagnosis and treatment.

Progress in evaluation methods of dental implant placement accuracy

Su Tianyue, Teng Weiwei, Wang Qi, Shu Qianyi, Zhou Libo

2022, 27(4): 248-253. DOI: 10.12337/zgkqzzxzz.2022.08.009

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The application of digital technologies such as static guide, dynamic navigation and dental implant robot in the field of dental implant achieves the purpose of accurate implant placement. However, there is no unified standard for accurate recording and evaluation of dental implant sites, it is particularly important to select high-resolution postoperative evaluation methods to accurately reflect the accuracy of dental implants. At present, the commonly used instruments for assessment after dental implant surgery include CBCT, intraoral scanner, desktop optical scanner, and three-coordinate measuring instrument. In drilling experiments in other fields, calipers, plug gauges, digital measuring instruments such as three-coordinate measuring machine and laser tracker are also used for measurement, which can provide reference for the evaluation of the accuracy of dental implant implantation. In this paper, the principles, precision and characteristics of the accuracy evaluation methods involved in the drilling experiments of dental implants are reviewed, in order to provide a theoretical reference for the accuracy evaluation of dental implants in experiments and clinical practice.

The application of dynamic navigation system in dental implant training

Jiang Ruifang, Zhang Yanfang, Li Xue, Liu Liu, Xue Peng

2022, 27(4): 254-258. DOI: 10.12337/zgkqzzxzz.2022.08.010

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Objective To explore the application of dynamic navigation technique in dental implant training. Methods 20 postgraduate students were included in the training course which combined theoretical course with model simulation operation. The theoretical course of implant dentistry was delivered first and subsequently all students performed free-hand and dynamic navigation implant surgery on the simulation jaw models in sequence. At the end of the course, an error analysis between the two techniques was conducted and a questionnaire was registered by the students, focusing on the comparisons of advantages and disadvantages between dynamic navigation system and free hand surgery, and put forward suggestions for improvement. ResultThe values of implant platform deviation, apical deviation and angle deviation in the dynamic navigation group were lower than those in the free-hand operation group, and the difference was statistically significant (P<0.05), indicating that the students were more accurate in implant placement under the assistance of dynamic navigation.The results of the questionnaire survey show that dynamic navigation helps to improve the students' hands-on ability, increase their interest in learning, and the students' satisfaction is high. Conclusions The application of the dynamic navigation system in the implant training course has exhibited a satisfying teaching effect and is worthy of spreading.

Applied anatomy and CBCT evaluation of blood supply and mucoperiosteum in the maxillary sinus

Chen Deping, Liu Qian, Pi Xuemin, Pan Hong, Tan Baosheng, Su Yucheng

2022, 27(4): 259-263. DOI: 10.12337/zgkqzzxzz.2022.08.011

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