Chinese Journal of Oral Implantology

Letter from editor in chief

Su Yucheng

2021, 26(1): 1-1. DOI: 10.12337/zgkqzzxzz.2021.02.001

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Key points of technique and experience of Extraction socket grafting-ridge preservation

Qiu Lixin

2021, 26(1): 2-6. DOI: 10.12337/zgkqzzxzz.2021.02.002

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The current concept of dental implants is to achieve functional and aesthetic rehabilitation with minimal trauma. Intervention at the very beginning of extraction could reduce the surgical trauma in late stage and complexity of bone and soft tissue augmentation. Ridge preservation involves the grafting in the extraction socket, preserving or augmenting the residual crestal ridge. The aim of this article is to review the definition, indication and key points during operation of ridge preservation. Combining with personal clinical experience, the development tendency of the technology has been discussed.

Long term esthetic effect of implant restoration after alveolar ridge preservation of maxillary central incisor.

Ge Yi, Jiang Xiuying, Su Yucheng

2021, 26(1): 7-12. DOI: 10.12337/zgkqzzxzz.2021.02.003

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Objective The aim of this study was to evaluate the esthetic outcome of single maxillary incisor after delayed implant placement with alveolar ridge preservation, with index of pink and white esthetic scores. Methods Atotal of 9 cases treated from March 2006 to December 2014 were included in this study, each of which had one central maxillary incisor extracted followed by alveolar ridge preservation. The mean follow-up was 7.7 year, and all the data was gathered retrospectively over 4 years .The implants were placed after a healing period of 3~6 months, and the crowns were inserted 3~4 months after surgery. The assessment was performed using digital photographs presenting corresponding clinical situation with Pink Esthetic score(PES) and White esthetic score(WES). Results All the 9 implants were osseointegrated. The mean total PES/WES was (16.56±1.34) (range: 15 to 19). The mean PES was (7.78±1.13)(range: 6 to 9), the mesial papilla had the highest mean score(1.89±0.31), but root convexity/soft tissue color and texture had the lowest mean score(1.11±0.57), mean scores for the facial mucosa curvature and the distal papilla were the same as 1.56±0.50. mean scores for WES was (8.78±0.63)(range: 8 to 10). Conclusion Delayed implant placement with alveolar ridge preservation is an effective technique in achieving satisfactory esthetic Results of maxillary incisor.

Clinical research of the osteotome sinus floor elevation in patients with chronic maxillary sinusitis

Wang Xingxing, Chen Xutao, Wang Lei, Shi Shaojie, Zhao Guoqiang, Zhao Wenshuang, Song Yingliang

2021, 26(1): 13-17. DOI: 10.12337/zgkqzzxzz.2021.02.004

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Objective To analyze the bone remodeling around the implant in patients with chronic maxillary sinusitis after the osteotome sinus floor elevation (OSFE). Methods 60 patients with implant restoration in the posterior maxilla area by OSFE from January, 2015 to June, 2016 in our department were selected retrospectively in this study. They were divided into two groups according to the mucosal thickness. Changes in marginal bone level over time were observed. Results By the Independent sample t test, the apical bone height (ABH) and marginal bone loss (MBL) was compared between the two groups at 6 months and 3 years after surgery. There was no statistically significant difference in ABH and MBL between the two groups (P>0.05). 3 years after surgery, the VBG in the inflammation group was significantly lower than that of the control group, and the difference was statistically significant (P<0.05). Conclusion For patients with chronic maxillary sinusitis, it is feasible to use the Osteotome sinus floor elevation, and the prognosis is good.

Clinical study of autogenous bone grafting for reconstruction of atrophic alveolar ridges in long-term performance

Yu Huajie, Qiu Lixin

2021, 26(1): 18-24. DOI: 10.12337/zgkqzzxzz.2021.02.005

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Objective The aim of this study is to evaluate the efficacy and long-term clinical outcomes of autogenous bone block/laminar reconstruction of alveolar ridge defect, and analyze the key factors affecting the success rate of autogenous bone graft and implants. Methods And Materials This retrospective study was conducted from January 2000 to December 2015. A total of 66 patients underwent autogenous onlay bone graft to reconstruct bone defect were enrolled in this trial, and all the patients were followed-up for at least 5 years, The width and vertical height of alveolar bone were measured at the time of surgery and reentry surgery. Integration of graft, implant survival rates and complications were recorded. Results 89 patients were screened for eligibility. Eventually, 66 patients with 116 implant sites were enrolled in this trial. Of these, 50 patients received horizontal augmentation, while 16 received vertical augmentation. The average of follow-up was 8.1 years. Bone resorption rate after horizontal and vertical augmentation was 9.0% and 10.9% respectively. Graft integration and implant survival rates were 95.8% and 95.7% respectively. 3 bone blocks failed to integrate. Among all the 116 implants, periimplantitis occurred in 5 cases. 1 case presented paresthesia lasting up to 6 months because of minor nerve impairment. Conclusion This study demonstrated that autogenous bone graft was effective and reliable for reconstruction of severe atrophic alveolar ridges. Favorable fixation, appropriate technology selection and flap management had great influence on graft integration and bone maintenance.

Osseointegration and histological observation of chemically modified implants in different phases

Wang Lingxiao, Shan Zhaochen, Gao Zhenhua, Su Yucheng

2021, 26(1): 25-30. DOI: 10.12337/zgkqzzxzz.2021.02.006

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Objective To observe the osseointegration effect of hydrophilic surface modified dental implants. Methods four beagle dogs were randomly divided into 2week, 4week, 8week and 12 week groups. Four hydrophilic surface modified dental implants were implanted into the mandible of 2 months after tooth extraction in each group. Results the ISQ, critical rotation torque and osseointegration rate were significantly increased at 4 weeks compared with 2 weeks; the critical rotation torque and osseointegration rate were significantly increased at 8 weeks compared with 4 weeks; the osseointegration rate was significantly increased at 12 weeks compared with 8 weeks. Conclusion Hydrophilic surface modified surface treatment promotes osseointegration of implants.

Continuous Maxilla Growth after Dental Implant Restoration in the Maxillary Esthetic Region in Young Female Adults: Case Report

Wu Tao, Sun Jing, Yan Qi, Shi Bin

2021, 26(1): 31-34. DOI: 10.12337/zgkqzzxzz.2021.02.007

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This study aimed to analyze the esthetic outcome and infraocclusal complications resulted by the continuous maxilla growth of the tooth adjacent to the implant tooth via three different young female adults cases up to 10-year follow-up after implant tooth final restoration. The main complications observed in these cases were: shorter incisal edges, disharmony labial gingival margin with the contralateral tooth, labial frenulum deviations, diastema, or incomplete papillae, bone resorption, and infraocclusion. The causes attributed to dentoalveolar changes in adulthood, continuous growth spurts in young adult female, and periodontium remodeling. Finally, several solutions were proposed.

Bisphosphonate-related osteonecrosis of the jaw after implant placement: a case report and literature review

Wang Lu, Lin Haiyan, Liu Qian, Wang Qian, Su Yucheng

2021, 26(1): 35-39. DOI: 10.12337/zgkqzzxzz.2021.02.008

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This article reports a case of bisphosphonate-related osteonecrosis of the jaw. The patient was treated with bisphosphonates due to prostate cancer. Implant placement was performed in the left posterior mandible during the intake of bisphosphonate, which resulted in osteonecrosis in the operation area. Surgical treatment was performed, and the affected area was observed by endoscope during the operation. The patient healed well after operation. Furthermore, this article reviews the literature on the pathogenesis, related factors, treatment and prevention of bisphosphonate-related osteonecrosis of the jaw.

Dentin shell technique for the treatment of severe alveolar bone defect at the edentulous site

Xiao Wenlan, Hu Chen, Liu Yeyu, Man Yi

2021, 26(1): 40-43. DOI: 10.12337/zgkqzzxzz.2021.02.009

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The purpose of this clinical case analysis was to report the treatment and follow-up outcomes of one case with severe bone defect at the edentulous site, and to conduct a preliminary investigation of the efficacy of dentin shell technique for alveolar bone augmentation based on this case. One partial edentulous case caused by chronic periodontitis was included. Because of the significant bone resorption, the vertical distance between alveolar crest and inferior alveolar nerve canal was 3.63 mm approximately. Dentin shell technique was applied to conduct bone augmentation in this case. The non-functional third molar was extracted and processed into dentin shells with a thickness of ≤; 2 mm. The dentin shells were fixed at the recipient sites as an external barrier. The space between dentin shells and host bone was filled with Bio-Oss particles mixed with concentrated growth factor (CGF). A vertical bone gain of 10.62 mm was achieved 6 months after the bone augmentation surgery. Two implants were placed. The bone height and width remain stable without significant bone resorption, and the bone density increased, which indicated favorable bone regeneration outcome 6 months after implant placement. The outcomes of definitive restoration and follow-up were satisfying. Dentin shell technique is a novel three-dimension bone augmentation method and provides a novel choice for patients with non-functional natural teeth. But the efficacy of dentin shell technique needs further investigation in clinical trials with larger sample sizes and longer follow-up periods.

Computer assisted jaw reconstruction and full arch fixed implant restoration for ectodermal dysplasia patient

Ge Yanjun, Shan Xiaofeng, Li Man, Feng Hailan

2021, 26(1): 44-46. DOI: 10.12337/zgkqzzxzz.2021.02.010

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To investigate clinical approach of bone and soft tissue reconstruction and fixed implant restoration for dysplasia patient. Jaw reconstruction was done by iliac graft with digital guide and implants were placed under surgical guide. Free gingiva graft and second stage surgery was applied after implant osseointegration. Function and esthetic outcome was verified through fixed temporary restoration. Full arch screw retained fixed prosthesis was delivered for final restoration. Bone volume was good enough for implant placement. Implant ossteointegration was successful with enough keratinized tissue around implant after free gingiva graft. Patient was satisfied with the esthetic and masticatory function. The result was stable at 24 months follow-up. Fixed implant restoration for ectodermal dysplasia patient after hard and soft tissue augmentation was an effective therapy approach. Short-term result was stable.

Effect of implant restoration following two procedures of alveolar ridge preservation of upper and lower molars with advanced periodontitis (with a 6-year follow-up case analysis)

Zhang Haoyun, Wei Yiping, Hu Wenjie, XuTao, Liu Yunsong

2021, 26(1): 47-53. DOI: 10.12337/zgkqzzxzz.2021.02.011

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Implant therapy has become a routine restoration method for partial edentulous arch in patients with periodontitis. Since alveolar ridge preservation can provide superior hard and soft tissue conditions for implant therapy, it has been increasingly used in clinical practice. This article illustrates a case of long-term obersvation of alveolar ridge preservation in upper and lower molars with advanced periodontitis via two different techniques. In this paper, we discussed the rationale of the selection of two procedures of alveolar ridge preservation, and the imaging methods available for the evaluation of the results. This article provided experience for clinical management of molars with advanced periodontitis.

Evaluation of implants placed in ridge preserved bilateral maxillary second molars with flap versus flapless procedures: a case report with a 6-year post-loading follow-up

Han Ziyao, Zhao Liping, Xu Tao, Hu Wenjie, Liu Yunsong

2021, 26(1): 54-59. DOI: 10.12337/zgkqzzxzz.2021.02.012

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Molar sites with advanced periodontitis often caused severe bone loss. Maxillary second molar lies in the distal area of the maxillary arch, where oral hygiene is difficult to perform and implant treatments has higher risk. Ridge preservation is performed after tooth extraction to facilitate implant placement by maintaining hard and soft tissue contour. This article presents a case with bilateral maxillary second molars receiving different methods of ridge preservation prior to implant reconstruction at 6 years of function, which provides evidence and clinical experience for the treatment plan and management for such kind of cases.

Immediate implant loading in the edentulous mandible with a definitive restoration using intra-oral welding，a case report

Wang Dedong, Zhang Ting, Wang Zhongqun

2021, 26(1): 60-63. DOI: 10.12337/zgkqzzxzz.2021.02.013

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Disappearance of a dental implant in complete denture after migration to maxillary sinus, a rare case report

He Manting, Gao Wenmo, Tan Baosheng, Geng Wei

2021, 26(1): 64-66. DOI: 10.12337/zgkqzzxzz.2021.02.014

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Anatomical factors related with maxillary sinus floor elevation procedure

Gao Wenmo, Geng Wei, Chen Ming

2021, 26(1): 67-71. DOI: 10.12337/zgkqzzxzz.2021.02.015

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Due to its physiological characteristics, the posterior maxilla is often accompanied by the lack of bone or the low quality of bone for implant insertion. Maxillary sinus floor elevation procedure is often used as a solution to the vertical bone deficiency in the maxillary posterior tooth area. However, the presurgical evaluation based on CBCT is particularly important. The aim of this literature was to review the local factors related with maxillary sinus floor elevation procedure.

Research progress on the emergence profile of implant-supported provisional restoration in the esthetic zone.

Yang Shengtao, Yue Li, Yuan Quan

2021, 26(1): 72-76. DOI: 10.12337/zgkqzzxzz.2021.02.016

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Correct emergence profile design of implant-supported provisional restoration is essential to obtain ideal esthetic outcome and its long-term stability, fabrication of provisional restoration and transferring of emergence profile to the definite prosthesis also play a key role in the implant therapy. This article summarizes the concepts and techniques used to design, contour, and transfer the emergence profile of implant-supported provisional restoration on different clinical situations to provide reference for clinicians.

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