Table of Content

10 June 2020, Volume 25 Issue 2

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Effect of PRF on immediate implant of anterior teeth loss and its effect on bone resorption

HUANG Bei, TANG Caomin, ZHANG Sheng, et al

2020, 25(2):  51-54.  DOI: 10.12337/zgkqzzxzz.2020.06.001

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Objective: To study the effect of PRF on immediate implant of anterior teeth loss and its effect on bone resorption. Methods: Ninety patients with anterior teeth missing admitted to our hospital from May 2017 to May 2019 were selected as the research objects. They were randomly divided into two groups: observation group and control group, 45 cases in each group. The control group was treated routinely after implantation, while the observation group was treated with PRF after extraction. The clinical efficacy, cosmetic effect and adverse reactions were compared between the two groups. Two groups of patients were reexamined after 2, 4, 8 and 12 months of treatment, and bone resorption levels were compared between the two groups at different time points. Results: The effective rate of the observation group was 97.78%, which was significantly higher than that of the control group(82.22%, P<0.05). The bone resorption level of the two groups decreased after 4, 8, 12 months of treatment compared with 2 months of treatment(P<0.05). After 2, 4 and 8 months of treatment, the bone resorption level in the observation group was significantly lower than that in the control group(P<0.05). There was no difference in bone resorption between the two groups after 12 months of treatment(P>0.05). After treatment, there was no difference in tooth color and facial condition score between the observation group and the control group(P>0.05). After treatment, the scores of dental appearance and overall aesthetics in the observation group were significantly higher than those in the control group(P<0.05). After 12 months of treatment, the total incidence of adverse reactions in the observation group was 6.67%, which was significantly lower than that in the control group(24.4%, P<0.05). Conclusion: PRF can promote bone tissue repair and wound healing, reduce bone resorption, reduce the incidence of adverse reactions after treatment, and improve dental aesthetics. It is worthy of clinical promotion.

The retrospective analysis of a short-term clinical and radiologic applications of kangsheng implants

CHEN Ping, YAO Guiliang, WANG Xiaheng

2020, 25(2):  55-59.  DOI: 10.12337/zgkqzzxzz.2020.06.002

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Objective: To retrospectively evaluate the 3 years clinical and radiologic outcomes of Kangsheng implants. Methods: A total of 157 patients with 279 implants were placeed from May 2017 to March 2019 at the department of implantology, Baoji stomatological hospital. Patients were follow ed up. The survival rate and the marginal bone loss were evaluated by clincal and radiologic examination. Results: The 279 implants were follow up 6 to 24 months, one implants lost, two implants where the base screw were broken. The survival rate is 98.6%. The medial and distal marginal bone loss were（0.95±1.08）mm and（0.87±1.21）mm, and no differences in the first and second year. Conclusions: High implant survival rate was achieved by Kangsheng implants in the short term, marginal bone level was relatively stable, clinical outcomes were reliable.

Zygomatic implants technique for bone atrophy in maxillary posterior regions

LI Mingfei, TANG Yong, ZHOU Yutao, et al

2020, 25(2):  60-63.  DOI: 10.12337/zgkqzzxzz.2020.06.003

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Objective: To report the clinical application of zygomatic implants in patients with severe bone atrophy and defect in maxillary posterior regions. Methods: 7 zygomatic implants and 13 conventional dental implants were implanted in 4 patients. 3D CT reconstruction of jaws was performed in all patients before operation. A 1:1 maxillary models were made using 3D printing technique to design the locations and directions of implantation of zygomatic implants, according to the Branemark zygomatic implant method. Results: 7 zygomatic implants and 13 conventional dental implants were implanted in ideal axial and position. Temporary fixed denture rehabilitation was performed from 1 to 7 days after implantation, and permanent denture rehabilitation was performed after 3 months. Followed up for 6 months to 2 years, dentures function normally. Conclusion: The zygomatic implantation is a feasible method for the reconstruction of masticatory function in patients with severe bone absorption and maxillary defect.

A retrospective study of locator implant overdenture in elderly edentulous patients

LI Jun, ZHANG Junhua, SUN Lihua, et al

2020, 25(2):  64-68.  DOI: 10.12337/zgkqzzxzz.2020.06.004

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Objective: To study clinical application of locator implant overdenture in elderly edentulous restoration. Methods: The edentulous patients who underwent locator implant overdenture restoration in the Department of Prosthodontics, Binzhou Medical College Hospital from February 2014 to March 2017 were included. The probing depth(PD) and modified plaque index were recorded at the time of follow-up. Plaque index, mPLI), modified Bleeding Index(mBI), marginal bone resorption(MBL). Results: A total of 46 patients(139 implants) were enrolled. The average follow-up was 25 months. The mean PD, mPLI, and mBI were 1.6±1.1, 0.9±0.6, and 0.8±0.5, respectively. The bone resorption at the implant margin was(1.2±1.0)mm, (1.1±0.9)mm. The scores of PD, mPLI, and mBI were significantly higher when oral hygiene was poor(less than 3 minutes for each brushing time and less than 2 times a day)(P<0.05). The bone resorption of 3-4 marginal implants was significantly less than that of 1-2 implants(P<0.05). Conclusion: Locator implant overdenture can achieve good clinical results in soft and hard tissues in a short time. The number of implants should be increased as much as possible when designing locator overdenture implant. Proper oral hygiene maintenance after permanent repair is the key to ensuring long-term soft and hard tissue stability.

Study on the accuracy of the digital implant guides in the aesthetic area

CHEN Sufeng, LIN Yina, LIN Hai, et al

2020, 25(2):  69-71.  DOI: 10.12337/zgkqzzxzz.2020.06.005

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Objective: To explore the influence of a universal implant guide on the accuracy and clinical effect of implant surgery in the aesthetic area. Methods: With computer-guided surgery the position of the planned implants was compared to the actual position of the implants. The preoperative computed tomography data was matched with the postoperative computed tomography data by using exocad software. A analysis was used to evaluate the effect on the implant accuracy and angle. The clinical effect was evaluated 2 weeks after repair. Results: (1) The accuracy of the implant neck and root was controlled within 1mm and the average angular deviation of the implant neck and root was less then 5°. (2) The clinical results was good. The implant angle and gingival margin position were basically the same as the design. Conclusion: The universal implant guide has high accuracy, small devitation angle, and satisfactory clinical results.

Clinical study on the application of flap and flapless technique in the immediate implantation of maxillary anterior teeth

XIONG Hang, NIU Tao

2020, 25(2):  72-75.  DOI: 10.12337/zgkqzzxzz.2020.06.006

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Objective: To observe and compare the clinical effect of flap and flapless in the immediate implantation of maxillary anterior teeth. Methods: We divided 30 patients into flap group and flapless group randomly. The two groups were used implants from SIC. Biooss bone powders mixed with the autograft obtained during the implantation surgery as bone graft material. Then infiltrated by their own blood, and the absorbable collagen membrane as the barrier membrane. In the flap group, immediate implantation was performed after gingive incised, while in the flapless group, immediate implantation was performed only with the extraction socket during operation. The patients were followed up for 1 year. The gingival papilla index, alveolar bone resorption height around the implants and the postoperative satisfaction were observed. Result: One year after the operation, the gingival papilla index and alveolar bone absorption of the two groups were compared, and the satisfaction about the operation was compared, while that of the flapless group was better（P<0.05）. Conclusion: Immediate implantation without flap can effectively improve the effect of implantation, and patients feel better.

Clinical application about two-stage closed sinus lift combined with CGF for severe bone deficiency in the posterior maxillary

XIAO Ting, LONG Hui, HU Bai, et al

2020, 25(2):  76-79.  DOI: 10.12337/zgkqzzxzz.2020.06.007

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Objective: To evaluate the long-term clinical outcomes of two-stage closed sinus lift for the maxillary sinus combined with CGF for severe bone deficiency in the posterior maxillary. Methods: Twenty-three patients with maxillary posterior tooth loss(1mm≤RBH≤2mm) were treated with two-stage closed sinus lift combined with CGF at the prosthodontics department of our hospital between February, 2014 and February, 2018, with 41 implants implanted. And implant-supported fixed prostheses were restored. According to the clinical observation and x-ray examination to assess the survival rates of the implant within 2 years. Results: Among the 41 implants placed, all implants showed well-osseointegrated to the alveolar bones, no implants were failed. The cervical alveolar bone surrounding the implants were stable at the end of the two years. The survival rate was 100%. Conclusions: In the 2-year follow up clinical study, favorable long-termclinical outcomes can be achieved by two-stage closed sinus lift for the maxillary sinus combined with CGF for severe bone deficiency in the posterior maxillary with less trauma and less clinical time, and provide a simpler and more convenient method to solve the problem of severe alveolar bone height deficiency in the maxillary posterior region, especially for the patients with severe limitation of mouth opening and thickening check muscle.

The clinical observation of immediate implantation with posterior maxillary molar bone extraction

GAO Hongqiang

2020, 25(2):  80-81.  DOI: 10.12337/zgkqzzxzz.2020.06.008

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Objective: To investigate the effect of immediate implantation of maxillary molars with bone extraction from the posterior region of maxillary molars. Method: Forty patients from May 2017 to May 2018 were selected, all of them were immediate implant patients. A total of 48 implants were implanted, of which 26 were taken from the posterior maxillary molar area as the experimental group and 22 were implanted with artificial bone powder as the control group. The 1-year survival rate of weight-bearing, the depth of exploration(PD), the modified peri-implant hemorrhage index(mBI) and the peri-implant plaque index(PLI) were compared between the two groups. The data were analyzed by PASW statistic 16.0 software. Results: The 1-year retention rate of weight-bearing in the two groups was 100%. There was no significant difference in bone resorption and gingival stability between the two groups. Conclusion: The immediate implantation of maxillary molar posterior area can achieve satisfactory clinical results.

Observation on the effect of handpiece disassembly cleaning method on the quality of dental cleaning by slow speed bending machine

ZHAO Xinxia, HUANG Bei, ZHANG Sheng, et al

2020, 25(2):  82-84.  DOI: 10.12337/zgkqzzxzz.2020.06.009

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Objective: To improve the cleaning and disinfection effect of dental bender, the handpiece disassembly cleaning method was applied in our hospital and the effect was observed. Methods: After periodontal scaling, NSK slow bending machine was randomly cleaned and detected 150 times per group. The patients were divided into the experimental group(manual+handpiece disassembly+ultrasonic cleaning group/manual+handpiece disassembly+thermal mechanical cleaning group) and the control group(manual+ultrasonic cleaning group). Results: There was no significant difference in the cleaning and disinfection effect between the two groups(P>0.05), and the cleaning and disinfection effect was significantly better than the control group(P<0.05). Conclusion: The slow bending machine for dentistry is a precision instrument with complicated structure.The application of manual initial washing, ultrasonic shock enzymatic washing/thermal mechanical cleaning, head assembly, oiling, curing, packaging and sterilization process after disassembly of the bending machine can get a satisfactory cleaning qualification rate of the bending machine, which is an ideal and effective method.