Chinese Journal of Oral Implantology

The measurement of maxillary sinus septa using conebeam CT and its application analysis for dental implant

ZHANG Chuan, QING Wei, GAN Shengyuan

2019, 24(3): 101-105. DOI: 10.12337/zgkqzzxzz.2019.09.001

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Objective： The purpose of this study was to determine the anatomical structure of maxillary sinus septa using cone beam computed tomography(CBCT) and assess its prevalence and location for maxillary sinus surgical interventions. Methods： Maxillary sinus images of 248 patients who underwent CBCT scan in Sichuan Provincial Hospital between September of 2017 and September of 2018 were collected. This study was to investigate the relationship between the anatomical variations of maxillary sinus septa and conditions of gender, location and absence of teeth. Results： There were a total of 248 patients(male 144, female 104),and the prevalence of maxillary sinus septa was 27.42%. Among the 248 patients, there were 36 patients with one maxillary sinus septa(14.52%), 28 patients with two sinus septa(8.87%), 4 pa- tients with three sinus septa(2.42%). The location of septa observed in all study groups demonstrated a greater prevalence(51.92%) in the molar region than in the pre-molar and post-molar region, which re- spectively were 24.0% and 22.0%. The average height on the sagittal plane was(6.20±2.82)mm to the left, while the right side is(5.83±1.80)mm. The percentage of bone crest in female was 26.47% and that in male was 73.53%. There was a statistical difference between male and female in maxillary sinus bone crest(P<0.05). At the same time, this study showed no statistically significant differences regard to loca- tion, but to gender. Conclusion： Septa of various heights and courses developed in all parts of the maxil-lary sinus. Therefore, to prevent possible complications during sinus surgery,CBCT is a good choice to observe the septa in maxillary sinus.

The applicafion of titanium mesh combined with anorganic bovine bone mined on alveolar bone vertical augmentation

KANG Bo, PAN Yingjing, WEN Yujie, et al

2019, 24(3): 106-109. DOI: 10.12337/zgkqzzxzz.2019.09.002

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Objective： To evaluate the effect of titanium mesh combination with anorganic bovin bone mined on vertical bone augmentation in the molar tooth region. Methods： 22 patients with vertical bone defect in our hospital from August 2013 to July 2016 group 1 were treated with a titanium mesh in combination with anorganic bovin bone mined and a total of 22 implants were implanted. Group 2 using absorbable collagen membrane combination with anorganic bovin bone mined and a total of 7 implants were planted. To evaluate the effect of the bone augmentation, the changes in the vertical height of the aluvolar ridge were measured by the Cone-beam computed tomography image. Results： Comparison of alveolar ridge height between preoperative and postoperative, there was a significant difference between the two groups (5.32±0.96)mm vs(3.87±0.86)mm, P<005. Conclusion： Titanium mesh combined with anorganic bovin bone mined can more effectively increase the vertical bone height of alveolar ridge and reduce the distance between the jaws. It is helpful for the long-term stability of implant after restoration.

Study and analysis of near and long term repair complications and risk factors of dental implant patients

XU Qiang, CHENG Jiahong, GULIMILA Muming, et al

2019, 24(3): 110-113. DOI: 10.12337/zgkqzzxzz.2019.09.003

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Objective： To study the short-term and long-term repair complications of dental implant patients and analyze the risk factors. Methods： From February 2012 to February 2017, 400 patients receiving dental implant treatment in our hospital were recorded as the objects of observation. All patients were divided into the repair complication group(98 cases) and the non repair complication group(302 cases) according to whether there were near and long-term repair complications after implantation. The two groups were compared in the methods of examination before implant surgery, implant length, implant diameter, bone augmentation and other aspects,estoration materials, screw retainer and bonding retainer, bridge or single crown restoration. Multivariate Logistic regression analysis was performed. Results： The proportion of patients in the repair complication group who received panoramic dental examination before implantation surgery was higher than the non repair complication group. Compared with the non repair complication group, the proportion of patients in the repair complication group receiving spiral CT examination before implant surgery was lower(all P<0.05). The implant length<10mm, implant diameter< 3.5mm in the repair complication group, the bone increment surgery was not accepted, the prosthesis materials were all-ceramic crowns, screw retention, and the number of patients with bridge repair were higher than those in the non repair complication group, respectively(all P<0.05). The multi-factor Logistic regression analysis available: spiral CT examination, the length of the implant<10mm, implant diameter< 3.5 mm, not incremental bone surgery treatment were independent risk factors for patients with dental implants short-term and long-term repair complications, short-term, long-term repair complications all porcelain crown, screw retention, bridge repair in patients with protection factor(all P<0.05). Conclusion： Spiral CT examination, implant length<10mm, implant diameter<3.5mm, no incremental bone surgery can increase the risk of short-term, long-term repair complications all porcelain crown, screw retention, bridge repair in patients with dental implants. Relevant intervention measures should be formulated according to the above factors in clinical work, so as to reduce the probability of short-term and long-term repair complications.

Clinical application of CGF in the implantation of maxillary anterior aesthetic area

REN Jing, ZHENG Jiajun, HUANG Jie, et al

2019, 24(3): 114-117. DOI: 10.12337/zgkqzzxzz.2019.09.004

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Objective： To observe the effect of Concentrated Growth Factor (CGF) in the cultivation of anterior teeth aesthetics. Methods： A total of 24 patients with maxillary anterior teeth aesthetics were enrolled, and patients were consented to use CGF to be divided into CGF group and control group. Cone beam com- puted tomography (CBCT) was used to measure the height of the alveolar bone and the thickness of the la- bial bone wall at different time after operation. The red and white aesthetic effects were evaluated by the Pink Esthetic Score(PES) and the White Esthetic Score(WES). Result: At 6 months postoperatively, the difference in alveolar bone height between the two groups was statistically significant(t=2.39, P<0.05). The difference in PES scores between the two groups was statistically significant (t=5.479, P<0.05). The difference in WES scores was statistically significant(t=2.256, P<0.05). Conclusion： CGF can promote bone regeneration and soft tissue repair. CGF is applied to the anterior teeth aesthetic area and is expect- ed to obtain better red and white aesthetic effects.

Clinical observation of dental implant repair for dentition defect in different implant systems

ZHU Lansheng, HE Wei, LIU Aiqun, et al

2019, 24(3): 118-122. DOI: 10.12337/zgkqzzxzz.2019.09.005

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Objective： To investigate the clinical efficacy and safety of two implant systems for implant repair in dentition missing. Methods： Patients undergoing simple implant repair from January 2014 to December 2015 in the dental implant department of our hospital were divided into Dentium group(320 cases, 320 teeth) and Anthogyr group(64 cases, 64 teeth) according to the planting system used. The follow-up period was 1 years. The implant success rate, clinical efficacy, bone tissue absorption value, periodontal pocket depth, esthetics score and complications were observed. Results： There was no significant difference be- tween the two groups in the success rate, the total effective rate and the complication rate(P>0.05). Bone tissue absorption value, periodontal pocket depth, and PIS showed no significant difference between the two groups at each follow-up time(P>0.05). In the two groups, the bone resorption value and the depth of periodontal pocket decreased significantly with the prolongation of the follow-up time, and PIS increased significantly with the follow-up time (P<0.01). Conclusion： The clinical efficacy and safety of two im- plant systems in the absence of dentition were similar.

Study on the application effect of new collagen-rich bone matrix in site preservation

ZHU Hongguang, BAI Jianwen, LI Ti, et al

2019, 24(3): 123-126. DOI: 10.12337/zgkqzzxzz.2019.09.006

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Objective： To evaluate the osteogenic effect of acellular cancellous bone matrix in site preservation of calf. Methods： We select sixteen pure male Beagle dogs, and then randomly divide them into four groups, four in each group. The third and fourth premolars of each Beagle dog were extracted. Then place Calf acellular cancellous bone matrix, Bio-oss bone, Bio-oss bone powder+CGF and blank control in the extraction socket of each group. After the teeth extraction sockets were covered with collagen membrane, and sutured tightly. Beagle dogs were sacrificed at 8 and 12 weeks after operation. The height and width of alveolar bone were observed by CBCT. Bone mineral density (BMD), number of trabeculae and absorption rate of bone materials were measured by ABA bone analysis software. New bone formation, bone remodeling and bone powder absorption were observed and compared by HE and Masson staining, meanwhile the Vascularization, osteoid mineralization, trabecular bone formation and inflammatory reaction were also observed at different stages. Results： There was no statistical significance in alveolar bone height between BABM, Bio-oss bone powder and Bio-oss+CGF tion.(Z=-1.475, P=0.140). The levels of BABM, Bio-oss bone powder, Bio-oss+CGF and blank group were higher at 8 and 12 weeks after operation than those in blank control group. The alveolar bone width before and after operation was lower than that before and on the day after operation at 8 and 12 weeks after operation. The difference has statistical significance(Z=-3.716,P<0.05). There was no statistical difference in bone height and width absorptivity between the acellular cancellous bone matrix group, the Bio-oss group and the Bio-oss+CGF group at 12 weeks after tooth extraction. Histomorphology showed that the new bone formation rate in the Bio-oss+CGF group and the acellular cancellous bone matrix group at 8 weeks was higher than that in the Bio-oss group. Conciusion: Calf acellular cancellous bone matrix can effectively maintain the height and width of alveolar bone and promote the early formation of alveolar bone during the preservation of extraction socket.

Validation study of digital photography training program for oral implantology

ZHOU Ti, REN Guanghui, ZHANG Ran, et al

2019, 24(3): 127-130. DOI: 10.12337/zgkqzzxzz.2019.09.007

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Objective： To explore the effectiveness of oral photography digital photography training programs. Methods： The oral digital photography training program was developed, and 19 oral implant clinicians were standardized trained. The training quality was analyzed from the photo quality and photographing time before and after the training. Results： After oral raphdigital photography standardization training, the quality of the trained doctors’photos was significantly better than that before training(P<0.05), and the time required for photographing was significantly reduced(P<0.05). Conclusion： Dental digital photogra- phy training can improve the photography skills of oral implant clinicians in a short period of time, and im- prove the efficiency of clinical work.

Analysis and discussion of factors related to dental implant failure

LIU Xu, FAN Boxi, LIU Xuzheng, et al

2019, 24(3): 131-134. DOI: 10.12337/zgkqzzxzz.2019.09.008

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Objective： To analyze and discuss the factors of implantation failure, there is an important significance to provide the basis for improving the success rate of implantation and provide clinical guidance for dentist. Methods： From October 2015 to October 2017, 497 implant cases were collected in the implantation center of Inner Mongolia Autonomous Region People's Hospital. 11 cases of implantation failure including infections, loosening and falling were reviewed. Clinical manifestations were analyzed and discussion. Results： During the statistical period, 497 cases(783 implants) were implanted, 11 cases (12 implants) were failure, early failure of implantation is more than late failure (P <0.05), and the failure of implants were more frequent in the posterior, especially in the maxillary posterior region(P<0.05). The age and sex of the patient also had an effect on the implantation failure(P<0.05). Conclusions： The main factors of implant abscission may be angle deviation, premature loading and multiple factors.

An impression method for accurately reproducing gingival morphology in implanting restoration

ZHOU Tian, REN Jing, WU Zongyan, et al

2019, 24(3): 135-138. DOI: 10.12337/zgkqzzxzz.2019.09.009

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Objective： To evaluate the accuracy of gingival perforation by modified impression method. Methods: Twenty patients with anterior tooth loss were fitted with temporary crowns which adjusted to induce gingival formation, measure the vertical distance from the gingival papilla to the gingival margin marker. Making traditional and improved impression in the edentulous area , measure the distance again and com- pared with the distance before taking the module. Results： There was no statistical significant difference in gingival perforation pattern between pre-impression and modified impression. Conclusion： Modified impression method can accurately reproduce the gingival perforation morphology and obtain ideal clinical aesthetic repair effect.

Cause analysis of dental implant failure

SUN Chenyu, ZHU Hongguang, BAI Jianwen

2019, 24(3): 139-141. DOI: 10.12337/zgkqzzxzz.2019.09.010

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Objective： To analyze the reasons of the failure after primary implantation. Methods： Implant loos- ening and falling off or swelling and pain in the operative area were the criteria for failure. In this study, a total of 4 patients with implant surgery failure were selected to analyze the causes of failure. Result: The 4 patients failed the primary implantation in the short term due to operational factors, bone burn and un- known reasons. Conclusion： Due to surgical factors, bone burn, implantable instruments are not cleaned and disinfected in place, implantable drill bits are not sharp enough, and intraoperative cooling is not in place, etc. all of which may cause failure of bone union.

Clinical study of dental implant restoration immediately after maxillary anterior extraction

XING Weichao

2019, 24(3): 142-144. DOI: 10.12337/zgkqzzxzz.2019.09.011

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Objective： To study the clinical effect of dental implant restoration immediately after maxillary ante- rior extraction. Methods： This study was conducted from January to December 2017 and included 150 pa- tients who underwent single-tooth extraction and implantation of the maxillary front in our hospital during this period. They were randomly divided into control group and observation group. The control group was given conventional tooth extraction and implant treatment. The observation group was given immediate dental implant treatment after tooth extraction. On the day after surgery, 3 months after surgery, and 6 months after surgery, gingival thickness, cervical bone resorption, bone density, and implant nipple index were graded. Red aesthetic index(PES) score and planting were performed 6 months after surgery. Body edge bone resorption(MBL) score. Results： At 3 months and 6 months after operation, the thickness of gin- giva decreased gradually, and the bone resorption and bone density of the neck increased gradually, com- pared with the day after surgery, P<0.05. At 3 months after operation, the bone resorption and bone miner- al density of the observation group were higher than those of the control group, P<0.05. At 6 months after operation, the bone resorption and bone mineral density of the observation group were higher than those of the control group, and the thickness of the gingiva was smaller than that of the control group, P<0.05. At 3 months and 6 months after operation, the nipple index of the two groups showed a gradual decrease, and the nipple index of the observation group was better than that of the control group, P<0.05. At 6 months af-ter operation, the PES score and MBL score of the observation group were higher than the control group, P <0.05. Conclusion： The clinical effect of the restoration of the implant after the extraction of the maxil- lary anterior teeth is obvious. The postoperative recovery is good and the appearance can be improved.

The nursing cooperation during implant-supported restoration using 3shape Trios oral scanner

QIN Yuan, SHI Cuihua, WANG Weifeng

2019, 24(3): 145-147. DOI: 10.12337/zgkqzzxzz.2019.09.012

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Objective： To introduce the feeling and experience of "four-handed operation"nursing cooperation during implant-supported restoration using 3shape Trios oral scanner. Methods： The experimental group was four-handed operation group, and the doctor installed a Ti-base on the implant. The patient's denti- tion and soft tissue were scanned with a 3shape Trios oral scanner. The CAD/CAM software was used to design and manufacture the implant-supported restoration while the control group did not use four-hand- ed operation. 3shape design software was used, the treatment duration and patient-related satisfaction evaluation were compared in between these two groups. Results： The satisfaction of patients with intraoral scanning model was significantly higher in the experimental group than in the control group(p<0.05),and the treatment time was shorter in the experimental group than in the control group. Conclusion： To master the operation steps of 3shape Trios intraoral scanning, and to carry out the four-handed operation more closely with the dentist play an important role in improving the accuracy of dental implant and patients’ satisfaction. The four-handed operation improves the patients’atisfaction and makes the treatment more effective. It also improves the operating efficiency and reduces the operating time.

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