Table of Content

30 December 2022, Volume 27 Issue 6

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Expert consensus on bone grafting materials for sinus floor elevation: bioactive agents, cell therapies and graft-free sinus floor elevation

Chinese Society of Oral Implantology

2022, 27(6):  329-333.  DOI: 10.12337/zgkqzzxzz.2022.12.001

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Sinus floor elevation is a reliable approach to solve the problem of vertical bone deficiency in the posterior maxillary area. At present, there are many bone grafting materials available for sinus floor elevation, but no consensus on their selection is achieved. This consensus focuses on bioactive agents, cell therapies and graft-free sinus floor elevation, and summarizes the results on their clinical application, hoping to provide a reference for the selection during clinical practice.

Special Article

Research progress of 3D printing individualized titanium mesh for complex bone augmentation

Ji Ping

2022, 27(6):  334-339.  DOI: 10.12337/zgkqzzxzz.2022.12.002

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Complex and severe alveolar bone defect is an important factor affecting the esthetic and long-term stability of dental implants. Compared to conventional bone augmentation, digital and custom bone augmentation could reduce operation time and improve the accuracy of bone augmentation. Three-D printing individualized titanium mesh (3D-PITM) shows good biocompatibility and space-making capacity, which could accurately reconstruct the alveolar bone contour. Thus, 3D-PITM has been gradually applied in the bone augmentation surgery. This paper introduces the application and research progress of 3D-PITM used for complex bone augmentation.

A case of teeth extraction and immediate implants with the application of ridge splitting technique in anterior mandibular alveolar ridge

Shi Wen, Wang Miaozhen, Liu Feng

2022, 27(6):  340-345.  DOI: 10.12337/zgkqzzxzz.2022.12.003

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In the anterior mandibular aesthetic area, there is usually sufficient bone in the vertical direction and insufficient bone in the buccolingual and horizontal direction. In this paper, we present a case of a patient with multiple mandibular incisors to be extracted due to chronic periodontitis, in which the ridge splitting was applied to the anterior mandibular alveolar ridge with teeth extraction and immediate implant placement simultaneously. Teeth extraction, ridge splitting and implant placement were performed at the same time, and the second surgery was performed 6 months after the operation, and temporary restoration and permanent restoration were completed by digital technology 7 and 8 months after the first surgery.Teeth extraction and immediate implant placement with ridge splitting procedure allows the clinician to effectively augment the horizontal bone, improve implant success rate, reduce the number of operations and avoid a second operative area. The simultaneous application of ridge splitting technique with tooth extraction and implant placement with proper indications and operation details may have certain advantages over other implant options.

Implant failure caused by mandible fibro-osseous lesions: a case report and the literature review

Zhao Man, Zheng Yaqi, Yan Zhengbin, Li Xiaomin, Yang Xiaoyu

2022, 27(6):  346-351.  DOI: 10.12337/zgkqzzxzz.2022.12.004

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A case of implanting in the bilateral mandibular posterior area simultaneously with different prognosis was reported. Finally, the implant on the right side was loose and removed after six months, which was failed without osseointegration. Otherwise, a good osseointegration was formed on the left side, and the implant was loaded routinely. In the right mandibular posterior area, there were fibro-osseous lesions with unremarkable imaging findings, which were finally diagnosed by histopathology. Mandible fibro-osseous lesions mainly refer to a mixture of pathological changes of fibrosis and ossification in technology. The performance of such lesions is not obvious or present with similar symptoms and radiographic appearances, which lead to difficulties in diagnosis. In this article, the causes of failure in this case were analyzed. Furthermore, the features of ossifying fibroma and fibrous dysplasia in clinical manifestation, radiology, histopathology and so on were reviewed in this article, in order to provide a risk assessment and early warning of implants with fibro-osseous lesions for clinic.

Reviews

Biological principle of emergence profile design of implant prosthesis

Yang Yufei, Gu Xinhua

2022, 27(6):  352-357.  DOI: 10.12337/zgkqzzxzz.2022.12.005

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The emergence profile design of the implant prosthesis will not only affect the aesthetic effect of the prosthesis, but also affect the health of the tissues around the implant. Good emergence profile design helps to form a perfect soft tissue barrier, prevent microbial invasion, protect surrounding soft and hard tissues, and avoid aesthetic and biological complications. On the basis of understanding the biological characteristics of the tissue around the implant and based on the patient's soft and hard tissue conditions, designing a reasonable implant placement position to protect the health of the tissue around the implant is crucial to the success of the implant and also a necessary factor for the design of the emergence profile.

Research advances in the production process of dental collagen membrane

Shu Qianyi, Su Yucheng

2022, 27(6):  358-364.  DOI: 10.12337/zgkqzzxzz.2022.12.006

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Guided bone regeneration (GBR) is an important technique in implant dentistry, in which oral collagen membranes play a key role. According to the production process, oral collagen membranes can be divided into acellular matrix membranes, purified collagen membranes and recombinant collagen membranes. At present, acellular membranes are main ones used clinically. Different types of collagen membranes have similarities and differences in production processes, and different production processes also have different effects on the properties of collagen membranes. This paper reviews the classification, production processes, comparison of different collagen membranes and the improvement of collagen membranes.

The immune microenvironment remodeling of the coagulation-immune complex based on the control of blood clot fibrin network

Su Mengxi, Wu Shiyu, Shan Zhengjie, Xie Lv, Wu Xiayi, Chen Zetao, Chen Zhuofan

2022, 27(6):  365-370.  DOI: 10.12337/zgkqzzxzz.2022.12.007

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The immune microenvironment of the early wound is the important stage that influences the outcome of tissue repair and regeneration. There is some overlap between the early immune microenvironment and the blood coagulation process including blood infiltration, clot formation, and its organization, as their biological processes involve many of the same immune cell clusters and cytokines. In recent years, it has been found that the fibrin network in clots can act on immune cells in several ways and be involved in shaping the immune microenvironment. Therefore, it has great significance to reveal the immunoregulatory targets of the clot fibrin network and to elucidate the regulatory laws. To address this coagulation-immune complex, we first clarify the effect of the blood clot and its fibrin network on tissue regeneration, further reveal the biological basis of the fibrin networks involvement in shaping the immune microenvironment, and finally introduce new advances in the regulation of the coagulation-immune complex immune microenvironment based on the fibrous network control. This review aims to provide ideas for the development of a new generation of immune-intelligent regenerative materials.

Research progress on the modification of polyetheretherketone for implant applications

Gu Teng, Wang Xuran, Wang Penglai

2022, 27(6):  371-375.  DOI: 10.12337/zgkqzzxzz.2022.12.008

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Polyetheretherketone (PEEK) has good mechanical properties, excellent biocompatibility, and elastic modulus close to the bone, avoiding the stress shielding effect on the bone and reducing bone resorption. It has been gradually used in the field of oral implants. However, the biologically inert surface of PEEK limits its clinical application in oral implants, and the modification of PEEK to optimize its bioactivity has become a hot topic for researchers to study. This paper presents a systematic review of research progress on the modification of PEEK for implant applications.

Application of socket-shield technique for immediate implant placement in aesthetic area

Zhao Yaoyu, Yan Qi, Shi Bin

2022, 27(6):  376-380.  DOI: 10.12337/zgkqzzxzz.2022.12.009

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Socket-shield technique has the advantages of maintaining alveolar bone dimension, reducing labial soft tissue recession and improving the aesthetic effect of restoration. An increasing number of oral implantology clinicians have become familiar with this technique in recent years. Through a literature review, this paper summarized and discussed the proposal and development of this technique, clinical operation process and medical evidence, so as to provide a reference for clinicians.

Decision tree for the selection of immediate restoration options after full-arch implant placement

Peng Lingyan, Wang Yong, Su Yucheng

2022, 27(6):  381-386.  DOI: 10.12337/zgkqzzxzz.2022.12.010

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Today, immediate fixed restoration after full-arch implant placement is being used by more and more clinicians and patients. New technologies, devices and software continue to emerge, and there is some confusion in clinical application. To standardize the application of this protocol and provide patients with a variety of options, according to the article “Immediate temporary restoration options after full-arch implant placement” published in June 2022 in this journal, the author team further establishes this decision tree to solve such clinical cases, with the aim of providing implant prosthetic dentists with advices and references of diagnosis and treatment, which dentists can adopt with a comprehensive decision-making based on clinical situation, dentist's experience, available equipment and software.

Continuing Education

The decision-making principles of sinus floor elevation (part 2)

Pi Xuemin, Chen Deping, Liu Qian, Ren Bin, Pan Hong, Su Yucheng

2022, 27(6):  387-392.  DOI: 10.12337/zgkqzzxzz.2022.12.011

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