Table of Content

10 June 2018, Volume 23 Issue 2

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Comparison of three kinds of composite bone

graft materials in the early of bone defect repair

2018, 23(2):  51-56.  DOI: 10.12337/zgkqzzxzz.2018.06.001

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Objective: Through the establishment of a simple model of bone defect, the complex of escoral hydroxyapatite(CHA)and platelet rich fibrin(PRF), the complex of coral hydroxyapatite and autogenous bone, the complex of coralline hydroxyapatite and recombinant human bone morphogenetic protein-two (rhBMP-2) and pure coral hydroxyapatite, four types of bone graft materials were implanted into four same bone defect areas. Then the ability of bone defect repair was compared between the four groups of bone graft materials in early different stages. Methods: Four bone defect areas were prepared in the six beagle dogs of canine bilateral tibial metaphyseal and were implanted with PRF/CHA, autogenous bone/CHA, rhBMP-2/CHA and CHA. The neck subcutaneou of six beagle dogs was injected with tetrac- ycline rochloride, calcein, alizarin red after second, fourth and eighth week, The six beagle dogs were executed and drawn after twelfth week, then bone growth condition of four bone graft areas was observed by gross specimen, hard tissue slices were made to compare the new bone formation in different bone graft area at different time by measuring fluorescence labeling rate. Results: Four groups of bone defect areas were completely closed in the gross specimen and there was no significant difference between the four groups of bone defect areas. Hard tissue slices observation result:four groups of bone defect areas showed orange fluorescence band after second week,namely new bone was found, the quantity of new bone:autogenous bone/CHA group>PRF/CHA group≈rhBMP-2/CHA group>CHA group, the green fluorescence band was increased significantly after second to fourth week, namely osteogenic ability was enhanced, the quantity of new bone:autogenous bone/CHA group>PRF/CHA group≈rhBMP-2/CHA group>CHA group, the four groups of bone defect areas showed red fluorescence after fourth to eighth week, the quantity of new bone:PRF/CHA group>autogenous bone/CHA group>rhBMP-2/CHA group>CHA group. Conclusion: During the twelve weeks, the osteogenesis effects of three kinds of composite bone graft materials were significantly better than that the pure coral hydroxyapatite, In the early stage, the quantity of new bone of three groups of composite bone graft materials were different in different time and autogenous bone/CHA group was best, PRF/CHA group was better than rhBMP-2/CHA group, after second week of operation, new bone was found in four groups of bone defect areas, the longer,the more of the quantity of new bone.

A preliminary animal study on osteoconduction capacity of coralline hydroxyapatite cylinders

YAO Zhongxiong, XU Shulan, SHAO Jun

2018, 23(2):  57-60.  DOI: 10.12337/zgkqzzxzz.2018.06.002

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Objective: The biodegradable coralline hydroxyapatite cylinder was implanted into the bone defect of the distal femur of rabbits, and the formation of new bone of coralline hydroxyapatite cylinder was dis-cussed, so as to provide references for the timing of implant placement. Methods: 30 white New Zealand rabbits were randomly divided into 24 rabbits in the test group and 6 in the control group. In the experi-mental group, 48 coralline hydroxyapatite were implanted in the distal femur of the rabbit, and 8 rabbits were sacrificed at 4, 8 and 12 weeks, respectively. Gross specimens were observed and histologically ana-lyzed. In the control group, all the animals were killed at 12 weeks, and the corresponding analysis was performed. Results: The 24 rabbits in the test group healed well. At the 4th week, there was only a few new bone formation at the edge of the implant. At the 8th week, there was obvious new bone ingrowth in the implant center. At the 12th week, both the edge of the implant and the new bone in the center in-creased. The percentage of new bone area in the test group was statistically significant between the 4th week and the 8 week, and there was no significant difference between the 8 week and the 12 week. In the control group, only a small amount of inflammatory cells and fibroblasts grew into the defect center, and no bone tissue was formed. Conclusion: The biodegradable coralline hydroxyapatite cylinder healed well after implantation into the bone defect of rabbit femur, and at 8 weeks, new bone was formed in the center of the bone, which is suitable for implant placement.

Comparative study between alveolar ridge splitting technique and augogenous onlay bone grafting technique in aesthetic implant dentistry

YUE Xilong, XU Sheng, LIU Zhonghao, et al

2018, 23(2):  61-65.  DOI: 10.12337/zgkqzzxzz.2018.06.003

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Objective: To make a retrospective analysis of the clinical aesthetic outcomes between alveolar ridge splitting technique(ARS)and augogenous onlay bone grafting technique(OBG) in the maxillary anteri-or region. Methods: 50 patients for dental implant treatment with either alveolar ridge splitting or augoge-nous onlay bone grafting procedure between January 2013 and January 2015 were included Yantai Stoma-tological Hospita. Of which, 25 patients undergone alveolar ridge splitting surgery with simultenoulsy im-plantation, while 25 patients for augogenous onlay bone grafting surgery received implants 6 months after. Single crown restorations were conducted 4 months after implant surgery. The following-up periods were 24 months, the following parameters were employed for the comparison: implant success rate, implant sta-bility, complications(minor complications: soft tissue fenistration, minor infection, bone fracture, major complications: soft tissue dehiscence, bone necrosis, inordinary sensory), and post operative reactions. SPSS17.0 was used for statistical analysis. Results: The success rates were 88% for alveolar ridge split-ting and 92% for augogenous onlay bone grafting respectively, there was no statistical difference between this two techniques(p>0.05). ISQ value immediately after implantation was 62.31±1.76 for alveolar ridge splitting and 75.12±1.21 for onlay grafting, which demonstrated a statisticaly higher primary stability for the augogenous onlay bone grafting group. 4 months after implant surgery, there was no statistical differ-ence for the ISQ value between this two techniques (83.28±2.15 vs. 82.21±1.53) (p=0.068). There were al-so no differnces for the rates of complications(p=0.214). The VAS evaluation for post-surgery reaction was 3.67 for alveolar ridge splitting and 6.13 for augogenous onlay bone grafting , which demonstrated a higher VAS for the augogenous onlay bone grafting group. Conclusions: Both of the alveolar ridge splitting tech-nique and onlay grafting technique are reliable techniques. The primary stability with augogenous onlay bone grafting is better than ridge splitting technique. There is no significant difference of bone graft bone absorption in the ARS and OBG Groups. Ridge splitting technique is more acceptable for patients consid-ering complications and post operative reactions.

Study on clinical application of Bicon dental implant in the immediate implantation of posterior teeth

GUO Shuigen, CEN Wen, WANG Yi, et al

2018, 23(2):  66-69.  DOI: 10.12337/zgkqzzxzz.2018.06.004

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Objective: The purpose of this study was to evaluate the short-term clinical outcomes of Bicon den-tal implants in the immediate implantation for posterior teeth. Methods: 24 patients(31 posterior teeth) with non-acute inflammation to be scheduled for immediate implant were selected to be treated with Bi-con dental implants after mi nimally invasive extraction and removing inflammatory tissue from January, 2015 to August, 2015. Autologous bone was implanted around the neck of the implant. Prostheses were re-stored after 3 to 6 months. The follow-up time was 18.6±4.3 months after the repair. To evaluate the clini-cal effect of Bicon implants in immediate implantation through clinical and radiological perspectives as well as patient satisfaction surveys. Results: During the follow-up, the survival rate of implants was 100%. The mesio and distal marginal bone loss during the implant is respective(0.32±0.41)mm and(0.28± 0.34)mm in a year after implantation. All dental implant were in normal function and patient satisfaction was very high. Conclusion: Bicon implants in the immediate implantation of posterior teeth could yield good clinical results in short term.

The application of small-diameter titanium-zirconium implant in immediate implantation in bicuspid area

DAI Junfeng, XUE Liyan, LIU Wanqi

2018, 23(2):  70-72.  DOI: 10.12337/zgkqzzxzz.2018.06.005

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Objective: To investigate the application of titanium-zirconium small diameter implant in immedi-ate implantation in the bicuspid area.Method: 46 implants of 40 patients from June 2015 to March 2017, were randomly divided into two groups,22 titanium-zirconium small diameter implants were applicated as the experimental group, 24 conventional implants were applicated as the control group. The changes of bones mass were observed, the load time, the success rate of dental implants were compared. Data using PASW 18.0 statistic software for statistical analysis. Results: The retention rate of the two groups was 100% in 1 years. The average loading time in the experimental group was significantly shorter than that in the control group, and there was significant difference in bone resorption between the two groups. Conclusion: The effect of immediate implantation of titanium-zirconium small diameter implant in bicuspid area is better than that of conventional diameter implant.

CGF combined with Bio-oss in the preservation of tooth extraction socket

XIA Zhoubin, REN Jing, ZHOU Tian, et al

2018, 23(2):  73-77.  DOI: 10.12337/zgkqzzxzz.2018.06.006

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Objective: To evaluate the role of CGF combined with Bio-oss in the preservation of tooth extraction socket. Methods: A total of 20 mandibular molar extraction patients were collected as the case of the tooth extraction socket in this study. The cone-beam computed tomography (CBCT) technique was used to measure the bone height, width, and density from CGF combined with Bio-oss 6 months before and after extraction. Results: There was no statistical significant difference in alveolar bone height between pre-ex-traction and post-extraction (P>0.05). The width had significant difference (P<0.05). There was no statisti-cal difference in density(P>0.05). After 6 months of implantation of CGF combined with Bio-oss bone meal, alveolar bone height and width absorption rate was lower than the average of the literature. Conclusion: CGF combined with Bio-oss bone powder can effectively maintain the height and width of alveolar bone in the extraction site of tooth extraction, and accelerate the generation of alveolar bone more quickly.

A case of a single-tooth implant restoration in maxillary aesthetic zone with narrow gap

WANG LIjun, DONG Xin, ZHAO Xinxia, et al

2018, 23(2):  78-80.  DOI: 10.12337/zgkqzzxzz.2018.06.007

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Objective: This study is aimed to investigate the single-tooth implant restoration in maxillary aes-thetic zone with narrow gap. Methods: This study did the implant surgery in a minimally invasive flapless way. And the permanent restoration was performed with an all-ceramic crown 4 months after the implant surgery. The restoration took the advantage of the teeth disorder to restore the gap with the cover of the dis-order to make up the narrow gap and disproportion between the teeth. Results: The color and the shape of the crown were in coordination with the natural teeth. And healthy pink aesthetics and proper white aes-thetics enhanced the whole facial aesthetic effect. The treatment effect was beyond expectation and the patient left with great satisfaction. Conclusion: The implant restoration in this study can meet both the functional and aesthetic demand of the patients with narrow gap in maxillary aesthetic zone which is sig-nificant in clinical therapy to some degree.

Discussion on standardized management of dental implant therapeutic room

CHENG Jing, ZHAO Xinxia, TEN Lizhao, et al

2018, 23(2):  84-86.  DOI: 10.12337/zgkqzzxzz.2018.06.009

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Objective: To improve the efficiency of dental implant nursing treatment,and ensure the implant surgery to be executed safely and smoothly, Methods: The management process was set in dental implant therapeutic room: materials distribution was controlled with planning, materials placement was catego-rized with specified position and standardized management of drawer was deployed, the environmental ownership of respective functional room was clearly specified, the dedicated person was assigned to man-age dental implants and implant instruments, and the multiple brands of dental instruments were allocat-ed by following the standard process, the monitoring on the patients was strenghened throughout the whole surgery procedure with status logged. Results: In consequence, nurse's preparation time was shortened before dental implant surgery, and the cooperation between surgeon and nurse runed more smoothly, there-fore more surgeries could be accomplished by spending the same time while the surgeon's satisfaction be improved. Besides that, the collaboration skill among dental implant nursing team had also been im-proved. This practice also benefited the implant instruments recalling on the loss prevention. The sur-geon's specialized requirement was met, too. The nursing risk was decreased respectively to ensure the surgery been executed safely and smoothly. Conclusion: After the standardized management method, the efficiency of collaboration could be improved obviously between surgeon and nurse with the risks and faults decreased, the surgery could be executed safely and smoothly.