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31 March 2023, Volume 26 Issue 2 Previous Issue    Next Issue

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Evaluation of clinical effect of modified intra-oral scan in implantation and restoration of edentulous patients Yuwei Wu, Jia Cao, Jun Qian, Li Yang, YiJiao Zhao, Yong Wang, Zhihui Tang 2023, 26(2):  87-94.  DOI: 10.12337/zgkqjxjyzz.2023.02.001 Abstract ( 169 )   PDF (22109KB) ( 97 )   Objective: To evaluate the clinical effect of modified intra-oral scan in implantation and restoration of edentulous patients. Methods: The position of multiple implants in an edentulous patient was recorded by modified scan body with extensional structure to increase the accuracy of digital impressions, and the prosthesis was designed and made by computer aided design/computer aided manufacturing(CAD/CAM). Results: The prosthesis made for edentulous patient achieved passive positioning in the mouth. Through X-ray examination, there was no gap between the Uni-abutment and the cutting support. Conclusion: New digital techniques such as modified intra-oral scan technology could provide a reliable alternative to conventional impression. References | Related Articles | Metrics

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The application of hybrid veneer technique in occlusion rehabilitation: A case report Wei Ren, Chunxiao Jin, Shengtao Yang, Shanshan Gao, Li Yue 2023, 26(2):  95-102.  DOI: 10.12337/zgkqjxjyzz.2023.02.002 Abstract ( 141 )   PDF (27579KB) ( 142 )   Objective: Hybrid porcelain veneer technology was used for occlusal reconstruction. Methods: Through diagnosis and treatment design, the treatment process is divided into disease control stage, aesthetic and functional recovery stage and final repair stage. Results: The abnormal discharge of masticatory muscles decreased after the patient wore the stable occlusal plate; Stable and repeatable movement; The shape of the tracing curve is smooth, smooth and symmetrical. The wax shape of the anterior teeth can improve the aesthetics and guide the reconstruction function at the same time; The wax pattern of the posterior teeth restored the shape of the mandibular surface and maintained the vertical distance, and reconstructed the masticatory function.Try to wear the temporary prosthesis in the mouth, and obtain good guidance of the front teeth, coordination of the occlusal relationship of the rear teeth, and balance of bilateral masticatory muscles. In the final restoration stage, the palatal cast porcelain veneer and labial feldspathic porcelain veneer were used to form an integrated composite porcelain veneer for the restoration of anterior teeth, and the posterior teeth were repaired with cast porcelain veneer. The examination showed that the median occlusion was stable and the lateral movement was canine protection. After 1, 3, and 6 months of treatment, the oral and maxillofacial function was stable, the patient had no obvious discomfort, and the symptoms of muscle tenderness completely disappeared after treatment. Conclusion: The hybrid veneer provides a new reference for the design of anterior restorations of full-mouth rehabilitation. References | Related Articles | Metrics

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A case of complete denture base food retention was solved using closed mouth impression muscle molding Na Li, Xia Liu, Jinghuan Li, Mengran Zhang 2023, 26(2):  103-106.  DOI: 10.12337/zgkqjxjyzz.2023.02.003 Abstract ( 85 )   PDF (12712KB) ( 23 )   Objective: To solve the problem of food storage on polished surface with complete denture. Methods: The correct shape of the polished surface of the denture was restored using the closed impression muscle molding. Results: The adjusted denture alleviates the problem of food retention in the polished surface. Conclusion: The closed mouth impression muscle molding can effectively guide the technician to make the correct denture polishing surface. References | Related Articles | Metrics

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Application of digital prosthodontic technology in the fabrication of complete-duplicated denture Bing Wang, Modi Heng, Danni Guo, Shaoxia Pan, Lili Guo, Tianhao Guo, Jian Qu, Hailan Feng 2023, 26(2):  107-115.  DOI: 10.12337/zgkqjxjyzz.2023.02.004 Abstract ( 120 )   PDF (72347KB) ( 188 )   Objective: To explore the workflow and clinical efficacy of fabricating duplicate dentures using digital prosthodontic technology. Methods: Using digital techniques, the model scanner was used to obtain the complete surface morphology information of the existing dentures. The generated STL file from this technique represented a digital duplicate of the scanned dentures. A wax-up duplicate denture was milled by five-axis CNC equipment. The occlusal relationship and fullness were re-determined after wax-up tried in. The initial models reproduced with silicone rubber and jaw relationship were transferred to the articulator. After wax teeth replaced with artificial teeth, the occlusal relationship was verified by dentist. After border molding, the wax-up was used to take close-mouth impression. The final models were poured using plater. The duplicate denture was completed after installing the plastic to the press box and heating. The patient’s satisfaction was measured using the visual analogue scale after denture delivery. Results: All restorations of ten patients were completed. The duplicate dentures with good retention and stability, and proper extension of the base edge got good aesthetics and high patients’ satisfaction. Occlusal balance was achieved by a bit of adjustment. Follow-up visit, the patients had no tenderness, and had good chewing function and good aesthetic effect. The visual analogue scale scores of the patients of digital duplicate dentures showed high satisfaction. The scores of the patients’ satisfaction of duplicate denture were higher than ninety-six in six aspects, including general satisfaction, easy cleaning, pronunciation ability, comfort, aesthetics and chewing function. Conclusions: The digital technology could be used to fabricate duplicate denture for edentulous patient who wore complete denture for a long time without discomfort to reduce clinical visits, simplify the clinical and technical procedures, and improve clinical outcomes and patient’s satisfaction. References | Related Articles | Metrics

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Application of digital temporary restoration in immediate implant restoration in anterior dental area: a case report Tingting Shu, Na Yu, Yuanyuan Wang 2023, 26(2):  116-122.  DOI: 10.12337/zgkqjxjyzz.2023.02.005 Abstract ( 89 )   PDF (5809KB) ( 54 )   Objective: To Improve the pink and white aesthetics of the patient’s anterior teeth and achieve better treatment effect. Methods: Using digital technology, DSD smile design was performed with patient smile photo before surgery, digital guide plate was used for surgery, the temporary restoration made in advance was placed immediately after surgery, and the perforating contour of the temporary restoration was personalized during the final repair. Results: The pink and white aesthetics of the patient’s anterior teeth area were better restored, and the results were better. Conclusion: Implant restoration of continuous multiple tooth loss in the anterior tooth area has always been considered an aesthetic challenge. For patients with delayed implant restoration, the anterior tooth area is often accompanied by soft and hard tissue defects, gingival papilla retreat and other physiological conditions, and the patient’s red and white aesthetic construction is even more difficult to control. References | Related Articles | Metrics

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Wax design and intraoral implementation of occlusal reconstruction cases Peng Liu, Shi Cheng, Jinghuan Li, Hongyan Deng 2023, 26(2):  123-128.  DOI: 10.12337/zgkqjxjyzz.2023.02.006 Abstract ( 84 )   PDF (7595KB) ( 41 )   Objective: To introduce the fabrication process of technician part in occlusal reconstruction through a case of occlusal reconstruction. Methods: A patient with severe mandibular tooth wear accompanied by porcelain of anterior prosthesis was selected. A stable occlusal plate was used to restore the vertical distance, the function and shape of the tooth was diagnostic wax-up, the temporary crown was directly transformed by pressing occlusal pad, and the temporary crown shape was reproduced by computer aided design/computer aided manufacturing(CAD/CAM) to make permanent prosthesis. Results: After the final repair, the patient's pronunciation and condylar track recorder were checked and satisfactory results were achieved. After treatment, follow up examination at 1, 3, 6 and 12 months later showed that the patient had no abnormal facial shape, clear articulation, no abnormal joint muscles, uniform distribution of bite force and smooth extension and lateral movement without interference by T-scan. Conclusions: The patient’s appearance and function were restored by the sequence therapy of occlusal reconstruction, and good results were obtained. References | Related Articles | Metrics

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Application of CAD/CAM process in orthodontic-restoration resin crowns Tingting Pu, Shimin Wang, Xiaoli Li, Lu Jia, Yu Sun, Dai Tong 2023, 26(2):  129-136.  DOI: 10.12337/zgkqjxjyzz.2023.02.007 Abstract ( 109 )   PDF (5238KB) ( 27 )   Objective: The study aimed to improve the fabrication process of orthodontic-restorative resin crowns from manual stacking method into CAD/CAM milling method, so as to achieve the effect of completely replicating the shape of crowns. Methods: The dentitions were scanned, and the temporary crowns was digital designed. The PMMA resin tray was digitally milled, and the resin crowns was sent to the clinic for intraoral trial. After adjustment, the resin crowns was scanned and the scan data was saved so that it could be manufactured later. The resin crowns was then returned to the clinic and cemented. Questionnaires were issued to physicians simultaneously to evaluate the satisfaction of retention, insertion time and adjustment convenience. In order to verify that another resin crown (Crown-02), which is identical to the resin crown cemented (Crown-01), can be milled with the scan data, the consistency of both crowns was verified. The PMMA resin tray was digitally milled to obtain Crown-02, and the two crowns were scanned for 3D deviation analysis. Results: A total of 21 crowns were included and the clinical effect was good. The result of dentists’ satisfaction was 92.9% for crown retention, 100% for wearing time, and 100% for adjustment convenience. The average deviation between the modified crown and the re-milled crown was 0.032±0.064mm, and the RMS value was 0.129±0.063mm. Conclusion: In the study, the CAD/CAM milling resin crowns can meet clinical requirements, and can be milled again to be exactly the same as the original resin crowns when needed, so as not to affect the orthodontic treatment. References | Related Articles | Metrics

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A novel technique to directly transfer casts scan to the virtual articulator by scanning maxillary bite registration of the bite fork Bo Dong, Xingqiang Yang, Wei Ren, Heyun Wang, Li Yue, Shengtao Yang 2023, 26(2):  137-144.  DOI: 10.12337/zgkqjxjyzz.2023.02.008 Abstract ( 87 )   PDF (13797KB) ( 56 )   Objective: To introduce a novel technique to directly transfer casts scan to the virtual articulator by scanning the maxillary bite registration of the bite fork, so as to improve the accuracy of casts transferring, and simplify the conventional facebow transferring and articulator mounting process. Methods: Transfer fork with the maxillary bite registration is first obtained and fixed to the transfer platform of a lab scanner, then the bite fork is scanned using the scanner, thus transferring the spatial position of the maxillary bite registration to the matched virtual articulator, and then the maxillary cast scan is transferred through the bite registration by matching the same landmarks. The mandibular cast scan is subsequently transferred by matching the maxillomandibular bite registration scan. Results: The casts were successfully transferred to the virtual articulator using the proposed technique, eliminating the conventional transferring and mounting process. Conclusion: Casts scan could be directly transferred to the virtual articulator through scanned bite fork with the maxillary bite registration, which improves the efficiency and accuracy of the virtual articulator transferring procedures. References | Related Articles | Metrics

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Thinking on the online teaching model of oral prosthetic technology Chang Liu, Na Li, Jing-Huan Li 2023, 26(2):  145-148.  DOI: 10.12337/zgkqjxjyzz.2023.02.009 Abstract ( 65 )   PDF (738KB) ( 32 )   Objective: We used digital denture design software to assist the online teaching of dental technology, and discussed the advantages and disadvantages of online teaching,in the context of COVID-19 pandemic. Providing the reference basis to further improve the quality of online teaching dental technology. Methods: The students of Capital Medical University School of Stomatology who participated in the practice from 2021—2022 were selected as the research objects, including 29 students of grade 2018 as the online teaching group and 22 students of grade 2017 as the traditional teaching group. The stage assessment results of the two groups were compared, and questionnaires were collected to analyze the teaching effect. Results: In the theoretical knowledge assessment, the score of the online teaching group was slightly higher than that of the traditional teaching group, and the difference was statistically significant(P<0.05). In the practical operation ability assessment, the score of the online teaching group was lower than that of the traditional group, and the difference was statistically significant(P<0.05). The questionnaire survey showed that most of the students thought that the digital denture design software combined with online teaching was helpful to understand the knowledge. Conclusion: Online teaching can not replace offline teaching, but it can combine with digital technology to help students understand the teaching content and serve as a supplement to offline teaching. References | Related Articles | Metrics

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Research on teaching practice of the blended teaching mode based on UMOOC V8 in the course of oral digital technology Jing Wang, Man Xu, Junying Wang, Dewu Yang 2023, 26(2):  149-153.  DOI: 10.12337/zgkqjxjyzz.2023.02.010 Abstract ( 90 )   PDF (807KB) ( 40 )   Objective: To explore the application value of the blended teaching mode based on the high-quality Massive Open Online Courses (MOOC) platform V8 in the teaching of oral digital course of stomatology technology specialty in higher vocational colleges. Methods: Select 35 students of the five-year stomatology technology major of the Beijing Health Vocational College in 2020 as the observation group and 35 students of the 2019 level as the control group. The mixed teaching mode based on high-quality MOOC V8 were adopted respectively. Compare the total course scores, participation and teaching evaluation results of the two groups of students. Results: The students in the observation group had higher scores in daily performance, final skill practice examination and quality evaluation than those in the control group, with statistically significant differences between the groups(t=3.168, t=3.876, t=3.932; P<0.05); The completion rate and participation frequency of the students in the observation group were better than those in the control group, with a statistically significant difference between the groups(t=4.906, t=4.306; P<0.05); The scores of self-worth evaluation of individual skills, method ability, internal drive and professional quality of students in the observation group were better than those in the control group, with statistically significant differences between the groups (t=3.171, t=4.843, t=4.512, t=5.769; P<0.05). Conclusion: Teaching design based on blended teaching mode based on UMOOC V8 in the course of oral digital technology can effectively solve the existing problems in teaching, improve students’ enthusiasm and learning effect, improve the overall level of course construction, and has a high application value in the course. References | Related Articles | Metrics

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Digital application in dental technology practical teaching Heyun Wang, Qianqian Zhang, Xingqiang Yang, Bo Dong, Wei Ren, Li Yue 2023, 26(2):  154-159.  DOI: 10.12337/zgkqjxjyzz.2023.02.011 Abstract ( 120 )   PDF (18865KB) ( 103 )   Objective: Explore the application effect of digitalization in the practical teaching of stomatology technology. Methods: In practical teaching, the teacher matched the clinical cases with the knowledge system and simulated the complete clinical process while students collected, settled and made the cases independently. Results: According to the final examination and questionnaire survey of 56 students (classes 2017~2019) who were highly satisfied with the course arrangement and teaching plan setting, the test scores improved significantly. The use of digital technology, teamwork, and other abilities have all improved. Conclusion: The teaching mode combined with clinical cases make students have a good command of knowledge, establish critical thinking, and cultivate their thinking about prosthodontics. References | Related Articles | Metrics