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Application of 3D Printed Individual Titanium Mesh in Bone Augmentation in Dental Implant Region WANG Zhiying 2023, 39(5): 383-387.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.001 Abstract ( 310 )   PDF (1188KB) ( 418 )   As a shield membrane of GBR, 3D printed individual titanium mesh(3D-PITM) has the advantage of good space maintaining for bone reconstruction and predictable horizontal and vertical bone augmentation. This article reviews the application of 3D-PITM by discussing thickness, porosity, osteogenic property, design and fabrication, surgical method, complications, comparision of contour of postoperative new bone and pre-operative bone expected, and the influence factors, prevention and treatment of titanium mesh exposure. References | Related Articles | Metrics

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Study on Shape of Incisor Canal and Its Clinical Significance in Orthodontic Treatment HUANG Zicheng, KONG Weidong 2023, 39(5): 388-391.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.002 Abstract ( 161 )   PDF (803KB) ( 326 )   The position of maxillary central incisors directly affects facial contour symmetry and midline coordination after orthodontic treatment. Therefore, the three-dimensional spatial angle of maxillary central incisors should be considered when making orthodontic treatment plan. With the wide application of CBCT, scholars found that the root resorption of maxillary central incisors was not only related to the palatal cortex of the maxilla, but also closely related to the shape of the incisor canal. Therefore, understanding the shape of incisor canal and its clinical significance in orthodontic treatment can provide guidance for clinicians in the formulation of treatment plans, process monitoring, and postoperative evaluation. This article reviews the structure of incisor canal and its clinical significance in orthodontic treatment. References | Related Articles | Metrics

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Research Progress of Periodontitis Aggravating Rheumatoid Arthritis by Flora LIU Rong, YANG Kun 2023, 39(5): 392-395.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.003 Abstract ( 195 )   PDF (806KB) ( 254 )   Periodontitis is an immunoinflammatory disease with multifactorial involvement caused by plaque microorganisms. Rheumatoid arthritis is a systemic immune disease characterized by chronic inflammation and destroy in joint tissues. Both diseases share similarities in pathological processes and mechanisms of tissue destruction, including bone destruction, soft tissue inflammation, and the influence of the same environmental factors etc. In recent years, increasing attention has been put on the role of gut microbiota dysbiosis in systemic diseases, where periodontal pathogenic bacteria may enter the intestine through swallowing to affect gut microecology. Dysbiosis of gut microbiota can further aggravate the development of arthritis. The purpose of this review is to reveal the possible effects of gut microbiota on interactions between periodontitis and rheumatoid arthritis through the gut microbiota, as well as the related mechanism. Hopefully, this review will identify new insights on the relationship between periodontitis and rheumatoid arthritis. References | Related Articles | Metrics

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Effects of Mechanical Stimulation on Biological Behavior of Periodontal Ligament Stem Cells WANG Xiaoli, AN Xiaoli 2023, 39(5): 396-401.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.004 Abstract ( 197 )   PDF (1917KB) ( 265 )   Periodontal ligament stem cells (PDLSCs) have great potential in the treatment of periodontal diseases and other tissue regeneration fields, and the study of their biological behavior is helpful to the development of regenerative medicine. Mechanical stimuli such as mechanical stress, matrix surface morphology, and elasticity not only affect the proliferation and migration of PDLSCs, but also have the potential to induce the differentiation of PDLSCs into bone, tendon, myocardium, cornea, and other somatic cells, and this process is regulated by the time dimension. In addition, the perception of PDLSCs to mechanical stimuli also has memory. PDLSCs can retain the mechanical information in the past culture environment and affect the direction of their future differentiation. Current studies have confirmed that mechanical stimulation signals of PDLSCs can be transmitted into cells through integrins and ion channels to regulate cell behavior. In this paper, the effects of mechanical stimulation on the biological behavior of PDLSCs are reviewed, in order to provide new ideas for the regulation of PDLSCs differentiation in tissue engineering. References | Related Articles | Metrics

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Application of Advanced Oxidation Process in Peri-implantitis Surface Decontamination Treatment LIU Suru, TIAN Weidong 2023, 39(5): 402-405.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.005 Abstract ( 123 )   PDF (794KB) ( 165 )   Peri-implantitis is often characterized as inflammation of peri-implant mucosa and progressive loss of marginal bone, which will lead to implant treatment failure. The primary principle for the treatment of peri-implantitis is to achieve a complete removal of plaque biofilm on the implant surface. Although many surface decontamination methods have been applied to clinical treatment, there are still some problems such as unsatisfactory decontamination effect, damage to the implant surface morphology during the decontamination process, and impact on the subsequent biocompatibility. In recent years, with the rapid development of advanced oxidation process technology, many new decontamination methods, which are different from traditional treatment schemes, have been proposed for implant surface decontamination treatment, and some have also been applied in practice. This article reviews the new decontamination methods related to peri-implantitis in recent years, with a view to provide reference for the selection and clinical application of new methods in the future. References | Related Articles | Metrics

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Clinical Application of Middle Temporal Vein in Scalp Coronal Incision HE Zuwu, TIAN Tian 2023, 39(5): 406-411.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.006 Abstract ( 126 )   PDF (4352KB) ( 154 )   Objective: To investigate the application value of middle temporal vein in coronal incision flap surgery for zygomatic complex fractures. Methods: Patients with zygomatic complex fractures who were hospitalized in Department of Oral Surgery, Changsha Central Hospital from January 2016 to March 2022 and required open reduction and internal fixation with coronal incision were selected. The flap was opened with the middle temporal vein as a marker for fracture reduction, and the postoperative follow-up was more than 6 months. Postoperative wound infection, postoperative hematoma, mouth opening, facial nerve injury, temporal depression, local alopecia, fracture, and healing satisfaction of patients were collected, analyzed, and compared with the patients with zygomatic complex fracture who underwent no such modified operation in our department. Results: A total of 47 patients underwent temporal flap with coronary incision guided by the middle temporal vein for internal fixation of zygomatic complex fracture. All patients underwent primary postoperative wound healing with good fracture healing and no postoperative hematoma or facial nerve injury. There was slight temporal fossa depression in 1 case, local alopecia in 2 cases, and slight restriction of mouth opening in 3 cases. The postoperative satisfaction rate was 97.87% (46 patients). There were 31 cases in the non-middle temporal vein flap group, and postoperative fracture healing was good, but there was postoperative wound infection in 1 case, postoperative hematoma in 4 cases, mild restriction of mouth opening in 3 cases, facial nerve injury in 3 cases, including 2 cases of frontal striae disappearance and 1 case of frontal striae disappearance combined with inability to close eyes, 1 case of temporal depression, 3 cases of local alopecia, and the postoperative satisfaction was 83.87% (26 cases). The incidence of postoperative hematoma and facial nerve injury in the non-middle temporal vein group was significantly higher than that in the middle temporal vein group (P<0.05). Postoperative satisfaction of middle temporal vein group was significantly higher than that of non-middle temporal vein group (P<0.05). There was no statistical difference between temporal depression, mouth opening, and local alopecia. Conclusion: When facing zygomatic complex fracture which needs flap surgery, using temporal vein in the temporal region combined with temporal vein across zygomatic screw as the operation sign will protect the facial nerve and ensures the venous return of temporal fat layer at the same time, reduce the incidence of facial nerve injury and postoperative hematoma, and simplify the flap surgery. References | Related Articles | Metrics

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Clinical Analysis of 51 Cases of Female Warthin's Tumors LU Han, FU Kun, GAO Zhenjie, GAO Ning, LIU Kangyan, ZHAO Yingying, YUE Xifan, HE Wei 2023, 39(5): 412-415.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.007 Abstract ( 144 )   PDF (1372KB) ( 138 )   Objective: To explore the clinical characteristics of female Warthin tumor and provide new ideas for its prevention and treatment. Methods: The clinical data of female patients diagnosed with Warthin tumor in the First Affiliated Hospital of Zhengzhou University from January 2014 to March 2022 were collected, and their age, height, weight, underlying diseases, tumor size, smoking, etc. were retrospectively analyzed. Results: 54.90% of patients were aged 61 to 80 years old, 47.06% of tumor diameter were less than 2cm, 39.22% of patients were overweight, 3.92% of patients were smokers, and 88.24% of patients were exposed to second-hand smoke. Conclusion: Female Warthin tumors mainly occur in elderly patients over 60 years old. Most of the tumors are less than 2cm in the diameter. Most of the patients do not smoke, but have second-hand smoke exposure history, which can be emphasized in prevention and clinical work. References | Related Articles | Metrics

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Effect of Post-irradiation Inflammatory Response on Tight Junction Proteins in Rat Submandibular Glands ZHANG Pengxin, ABUDUNAIBI·Maimaitituerxun, WU Yanhui, AIHAITI·Guliziba, FEI Runxin, YAO Qingting, XU Hui 2023, 39(5): 416-421.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.008 Abstract ( 138 )   PDF (5348KB) ( 119 )   Objective: To observe the changes of tight junction (TJ) proteins induced by post-irradiation inflammation and its effect on paracellular pathway in submandibular glands (SMGs). Methods: Twenty-four rats were randomly divided into Control group and 1, 6, and 12 weeks post-irradiation group. The control group was not irradiated. In radiation group, a dose of 20 Gy irradiation was applied on the right SMGs. At specific time points, saliva secretion was measured within 5 min. The pathological changes were observed by HE staining. Immunohistochemical staining was used to investigate the positive expression of TNF-α. The levels and distribution of claudin-1, claudin-3, and AQP5 were detected by WB and immunofluorescence staining. The mRNA expression was detected by RT-qPCR. The levels of TNF-α, IL-1β, and IL-6 were detected by ELISA. Results: The salivary secretion was decreased after 1, 6, and 12 weeks in the irradiation group. The interstitial edema, degranulation, vacuolation, and inflammatory cell infiltration of SMGs were increased continuously. The levels of inflammatory cytokines were increased. The levels and mRNA expression of claudin-1, claudin-3, and AQP5 were down-regulated, and the relative fluorescence intensity was decreased. Conclusion: The inflammatory response after radiation may play a vital role affecting the abnormities of TJ proteins in rat SMGs and the destruction of paracellular pathway. References | Related Articles | Metrics

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Study on Triclosan in Improving the Antibacterial Properties of Resin Cement HOU Yanyan, CHEN Huan, FENG Shanshan, DING Jingyu, ZHU Song 2023, 39(5): 422-428.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.009 Abstract ( 122 )   PDF (3216KB) ( 116 )   Objective: To prepare antibacterial resin cement containing photocurable triclosan derivative, and to evaluate its characterization performance, mechanical properties, adhesive strength, antibacterial properties, and cytotoxicity in vitro. Methods: The photocurable triclosan derivative (TCS-IH) was dissolved in acetone at 25 wt% and then added to Multilink Speed at a mass ratio of 0 wt%, 2 wt%, 4 wt%, 6 wt%, and 8 wt%, to obtain the resin cement with antibacterial properties for different components. FTIR was used to examine the conversion of double bonds before and after curing of resin cement in each group. The surface wettability of resin cement in each group was examined by static water contact angle. Its flexure strength was tested with a three-point bending test. Micro-tensile test was used to examine its instant bonding properties. S.mutans was selected for antibacterial experiments, and the antibacterial properties of resin cements were evaluated by colony counting, MTT, and live/dead bacterial fluorescence staining. The cytotoxicity grade in vitro was evaluated by CCK-8 cytotoxicity assay. Results: The addition of TCS-IH acetone solution at 2 wt% and 4 wt% had no significant effect on characterization performance, mechanical properties, and bonding strength of resin cement (P>0.05). When the mass percentage of TCS-IH reached 4 wt%, 6 wt%, and 8 wt%, resin cement all showed significant antimicrobial activity (P<0.05). Both 2 wt% and 4 wt% resin cements had good biocompatibility. Conclusion: When the mass percentage of TCS-IH was 4 wt%, the antibacterial properties of resin cement were effectively improved while its characterization properties, mechanical properties, adhesive properties, and biosafety were not affected. References | Related Articles | Metrics

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Effect of Selective Laser Melting Pure Titanium on Bond Strength of Titanium to Composite Resin by Different Surface Treatments REN Canxia, HU Dandan, SAIMI·Ayiseng, QIN Yao, LUO Xiaoping 2023, 39(5): 429-434.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.010 Abstract ( 143 )   PDF (3776KB) ( 184 )   Objective: To study the effectiveness of different surface treatments such as sandblasting and/or acid etching on the bond strength of selective laser melting pure titanium to composite resin. Methods: According to the ISO10477 standard, ninety-six selective laser melting pure titanium specimens were randomly divided into 4 groups and treated as follows: Group A1: grinding; Group B1: Sandblasting; Group C1: 4% hydrofluoric acid etching (HF); Group D1: 4% HF acid etching after sandblasting (n=24). Ninety-six forged titanium specimens from different processing technique were taken as the control groups, and the same surface treatments were done and recorded as A2, B2, C2, and D2 (n=24). After the surface treatments, a laser scanning confocal microscope was used to observe the surface morphology and roughness, the bond strength tests were carried out before and after the thermal cycles, and the mode of failures were observed by a stereo microscope. Results: The grinding group has the lowest roughness and the roughness of 4% HF acid etching after sandblasting was lower than that of sandblasting group (P<0.05). The bond strength of 4% HF acid etching after sandblasting group was about 4 times higher than that of grinding group (P<0.05), and the bond strength of the selective laser melting pure titanium specimens were (19.68±2.87) mPa and forged titanium specimens were (17.20±2.60) mPa. The bond strength between titanium and composite resin did not decrease significantly before and after the thermal cycling (P>0.05), and the durability was good. The fracture mode was mainly mixed fracture. Conclusion: Acid etching after sandblasting can effectively improve the strength of titanium to composite resin, which is one of the ideal methods for surface modification of selective laser melting titanium. It can significantly improve the bonding strength with composite resin and have good durability and can prolong the service life of the restoration to a certain extent at the same time. Selective laser melting titanium is a promising processing technology that can replace the traditional production of titanium for clinical applications. References | Related Articles | Metrics

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Effects of Fam83h Mutation on Proliferation and Migration of Mouse Osteoblasts HE Zhenru, ZHENG Xueqing, YANG Chunhui, WANG Xin, LI Yang, SONG Yaling 2023, 39(5): 435-439.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.011 Abstract ( 136 )   PDF (2020KB) ( 219 )   Objective: To explore the effect of Fam83h mutation on proliferation and migration of mouse osteoblasts (MOB) and the related mechanism. Methods: The whole body of wild-type and Fam83h-mutated mice were analyzed by micro-CT. CCK-8 and wound healing were detected in MOBs isolated from 3-day-old wild-type and Fam83h-mutated mice. RNA-seq was performed to compare the transcriptional profile of MOBs of Fam83h-mutated mice with wild-type mice. Phosphorylation of AKT1-S473 and AKT1 were measured by Western blot. Results: Fam83h-mutated mice showed decreased bone volume fraction (P＜0.001). Fam83h mutation significantly repressed cell proliferation and migration in MOBs (P<0.01). KEGG pathway analysis of differentially expressed genes (DEGs) identified PI3K/AKT signaling pathway. Furthermore, the protein expression level of p-AKT1-S473 was decreased in MOBs of Fam83h mutation mice. Conclusion: Fam83h mutation may inhibit the proliferation and migration of MOBs through PI3K/AKT signaling pathway, resulting in bone mass loss in Fam83h-mutated mice References | Related Articles | Metrics

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Anatomical Relationship Between Mandibular Median Lingual Canal, Mandibular Accessory Canal, and Mandibular Incisor Neural Tube with CBCT Imaging YU Hongbin, QIAN Shibing, LIU Chaofeng, XIA Zhigang, GAO Yage, ZHANG Lingpeng 2023, 39(5): 440-444.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.012 Abstract ( 185 )   PDF (1438KB) ( 195 )   Objective: To clarify the course of vascular neural network system in the mandibular anterior teeth. Methods: The data of 104 cases of CBCT were retrospectively studied. The relationship between mandibular median lingual canal, mandibular accessory canal, mandibular buccal canal, and mandibular incisor neural tube was observed. Inclusion criteria were: when multiple cross-sectional images such as sagittal section, coronal section, horizontal section, arbitrary section, and curved section were read, the presence of mandibular incisor neural tube, mandibular median lingual canal, and mandibular accessory canal or mandibular buccal canal could be clearly observed. Results: (1) The median lingual canal of mandible communicated with the neural tube of mandibular incisors in 15 cases. Neural tube communication of bilateral mandibular incisors was observed in 22 cases. There were 104 cases of sublingual or buccal canal communicating with mandibular incisor neural tube, with a total of 184 branches. Conclusion: (1) The mandibular incisor nerve can send out several small branches on the buccalingual bone surface of the corresponding tooth position, such as premolars, canines, and incisors. The running channels of these small branches are the mandibular accessory canal and the mandibular buccalateral canal. (2) The median lingual canal of the mandible is a pipe from the lingual side of the mandible to the interior, which tends to disappear. It is not connected with the neural tube of the mandible incisor, and in some cases, it is anastomosed with the nerve of the mandible incisor or runs through the mandible. (3) The median lingual canal of the mandible is not a small branch from the mandible body to the bone surface issued by the neural tube of the mandible incisor, but a path from the soft tissue to the mandible body issued by the branch from the vascular and nerve bundle of the mouth floor. References | Related Articles | Metrics

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Measurement of Apical Anatomy of Immature Maxillary Central Incisor using Cone-beam Computed Tomography WANG Linlin, TIAN Hongsheng, XU Ying, FAN Mingru, QIN Xiurong 2023, 39(5): 445-449.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.013 Abstract ( 153 )   PDF (1127KB) ( 180 )   Objective: To investigate the CBCT findings of apical anatomy of immature maxillary central incisors. Methods: CBCT images of 100 immature maxillary central incisors at Nolla stage 8 and 100 immature maxillary central incisors at Nolla stage 9 were collected. The mesiodistal and carniocaudal diameters of apical foramen of immature maxillary central incisors were measured by software included with CBCT, as well as the mesiodistal, carniocaudal, and facioligual diameters of apical shadow. The diameters of apical shadow and apical foramen were compared between Nolla stage 8 and Nolla stage 9. The correlation between the diameters of apical shadow and apical foramen was calculated. The data were analyzed with MedCalc software package. Results: The mesiodistal and facioligual diameters of apical foramen of immature maxillary central incisors at Nolla stage 8 were (2.75±0.68) mm and (3.28±0.74) mm, respectively. The mesiodistal, facioligual, and carniocaudal diameters of apical shadow of immature maxillary central incisors at Nolla stage 8 were (3.84±0.73) mm, (4.49±0.68) mm, and (3.41±1.27) mm, respectively. The mesiodistal and facioligual diameters of apical foramen of immature maxillary central incisors at Nolla stage 9 were (1.50±0.51) mm and (1.92±0.79) mm, respectively. The mesiodistal, facioligual and carniocaudal diameters of apical shadow of immature maxillary central incisors at Nolla stage 9 were (2.76±0.60) mm, (3.41±0.80) mm, and (2.06±0.65) mm, respectively. The immature maxillary central incisors at Nolla 8 stage showed significantly larger apical shadow and apical foramen than those at Nolla 9 stage (P＜0.05). The mesiodistal, facioligual, and carniocaudal diameters of apical shadow were positively correlated with the mesiodistal and facioligual diameters of apical foramen (P＜0.001). The apical region of maxillary central incisors at Nolla 8 stage was more likely to have a broad and blurred lamina dura. With the development of apical foramen, lamina dura in the apical region tended to be clear and sharp. Conclusion: The immature maxillary central incisors at Nolla 8 stage have larger apical shadow and apical foramen than those at Nolla 9 stage. With the development of apical foramen, lamina dura in the apical region tends to be clear and sharp. Clinical diagnosis and treatment of periapical periodontitis could be improved with better understanding of apical anatomy. References | Related Articles | Metrics

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Evaluation of Accuracy for Digital Tooth Preparation Guidance Technology CHEN Liang, ZHANG Xinyi, XING Zhenquan, LI Xin 2023, 39(5): 450-454.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.014 Abstract ( 161 )   PDF (2750KB) ( 193 )   Objective: To compare the accuracy of digital tooth preparation guidance technique with traditional tooth preparation techniques at different stages. Methods: The virtual diagnostic wax-up was printed into 20 resin models by 3D printing and divided into 4 groups. Group 1: use free-hand for tooth preparation; group 2: use a three-stage indicator template to guide the tooth preparation; group 3: use a self-limiting diamond burs to guide the tooth preparation; and group 4: use a rigid-constraint template to guide the tooth preparation. The models data were imported into the measurement software and matched with the virtual diagnostic wax-up to measure the depth of the indicator and tooth preparation. Results: The deviations of the indicator depth in the four groups were (76±19) μm, (95±17) μm, (65±14) μm, and (54±15) μm, respectively (P＜0.0001). The deviations of the preparation depth were (151±22) μm, (129±21) μm, (102±22) μm, and (78±17) μm, respectively (P<0.0001). The loss of tooth tissue was different among four tooth preparation methods (P<0.05). Conclusion: The accuracy of digital tooth preparation guidance technique is higher than that of traditional non-quantitative tooth preparation guidance techniques in all stages of tooth preparation. Either method has additional tissue loss during the finishing stage. References | Related Articles | Metrics

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Deep Learning-based Point Cloud Completion Network for Restoration of Calcified Root Canals in Maxillary Molars WEN Jiahuan, FU Yujie, REN Genqiang, CHEN Yufei, ZHANG Qi 2023, 39(5): 455-459.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.015 Abstract ( 226 )   PDF (2316KB) ( 274 )   Objective: To train a deep learning-based point cloud completion network by simulated calcified root canal samples for restoration of calcified canals in upper and middle thirds in maxillary molars. Methods: Two hundred maxillary molars (with complete pulp cavities and three root canals) were collected and scanned by Micro-CT to obtain 200 samples of 3D model of the pulp. The pulp morphology was edited using Mimics software to simulate the calcified root canals in upper and middle thirds of maxillary molars. The paired data of complete pulp and simulated calcified pulp were used as training samples for the point cloud completion network. A dataset containing 200 samples was produced, which was divided into 180 sets as the training set and the remaining 20 sets as test set. In the testing stage, the output results were grid processed through the reverse engineering software, and then compared with the ground truth for morphology evaluation. Results: The DSC between the prediction model and the ground truth was (86.80±1.32)%, the ASSD was (0.04±0.02) mm, and the HD was (0.28±0.05) mm. Conclusion: The predicted results are highly similar with the ground truth and the deviation of shape difference is small. The deep learning-based point cloud completion network can restore the calcified canals in upper and middle thirds in maxillary molars with good completion effect. It can provide a pre-theoretical basis for subsequent artificial intelligence-assisted calcified root canal treatment. References | Related Articles | Metrics

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Socket Shield Technique Combined with Digital Impressions for Immediate Dental Implant Placement in the Aesthetic Zone:A Case Report WANG Yao, XIAO Xing, WANG Hua 2023, 39(5): 460-462.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.016 Abstract ( 247 )   PDF (3148KB) ( 197 )   A case of socket shield technique for immediate dental implant placement in the aesthetic zone is reported. The osseointegration was observed after 3 months. Then, digital impression was got by Aoralscan 2 intraoral scanner, and customized abutment and ceramic crown were manufactured. During the follow-up of 1 year, steady osseointegration was acquired, as well as natural hard and soft tissue contour. References | Related Articles | Metrics

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Modified Free Gingival Graft for Widening Keratinized Mucosa at Peri-implant Area: a Case Report LI Xiaoyu, CAI Qing, GONG Hao, SUN Yuyan, ZHANG Ni, MENG Weiyan 2023, 39(5): 463-465.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.017 Abstract ( 186 )   PDF (3305KB) ( 199 )   The deficiency of keratinized mucosa is a common situation in the edentulous posterior mandibular area. This case report has rebuilt the sufficient width of keratinized mucosa in the peri-implant area with a modified free gingival graft surgery and kept the long-term health of the peri-implant tissue. References | Related Articles | Metrics

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A Case of Removable Partial Denture for Patient with Limited Mouth Opening with the Aid of Digital Technology JIANG Zhongwei, YANG Beining, ZHANG Fan, WANG Jiawei 2023, 39(5): 466-468.  DOI: 10.13701/j.cnki.kqyxyj.2023.05.018 Abstract ( 204 )   PDF (3988KB) ( 164 )   This paper reports on the digital restoration procedure of removable partial denture for a partially edentulous patient with limited mouth opening. The traditional tray impressions were difficult to complete for this patient. A digital intraoral scan was used to obtain digital impressions of the intraoral soft and hard tissues, and a computer-aided design and 3D printing technique were used to manufacture the diagnostic denture. The diagnostic denture was used to make final impressions and occlusal relationships and selective laser melting technology was used to produce a metal framework. The patient was satisfied with the restorative. This case provides a new way of thinking about the restorative process for partially edentulous patients with limited mouth opening. References | Related Articles | Metrics