微螺钉种植体支抗在内收上前牙中的应用

目的探讨微螺钉种植体支抗在内收上前牙中的应用。方法采用宁波慈北医疗器械有限公司生产的1.6 mm×11 mm自攻型支抗微螺钉,植入26例安氏Ⅱ类错合患者上颌双侧第二前磨牙和第一磨牙根间,利用种植体支抗内收前突上前牙。结果 26例患者植入52枚微螺钉,内收前牙过程中松动脱位6枚,平均8个月关闭所有拔牙间隙,矫治结束后所有患者表现为Ⅰ类合关系,覆盖减小,软组织侧面型得到显著提高。结论微螺钉种植体具有体积小,操作简单,创伤轻微等特点,在内收上前牙中能提供稳定、高效、持久的支抗力。     

酸蚀面螺纹状牙种植体的表面分析

目的:评价酸蚀面与机械面螺纹状牙种植体的表面差异.方法:应用扫描电镜(SEM)对10枚酸蚀面、10枚机械面螺纹状牙种植体进行表面分析,采用小鼠成纤维细胞(L929)进行细胞毒性试验.结果:酸蚀面螺纹状牙种植体表面呈无数微米级微孔,表面粗糙度Ra为2.1 μm.细胞毒性试验显示酸蚀面和机械面螺纹状牙种植体均无细胞毒性反应,生物相容性良好.结论:酸蚀面螺纹状牙种植体具有良好的细胞相容性,表面呈比较均匀的微米级微孔,是一种较理想的表面状况.     

数字牙种植体印模与传统牙种植体印模临床准确性比较

目的 比较数字牙种植体印模与传统牙种植体印模的临床准确性。方法 选择2022年4月至2023年4月在郑州大学第一附属医院治疗的120例牙体缺损患者为研究对象。按照种植体印模的不同分为两组,观察组67例患者选择数字印模,对照组53例患者选择传统印模。比较两组患者的种植体距离、垂直位移、角度、旋转差异,修复效果及不良反应发生率等指标。结果 与对照组比较,观察组种植体距离、垂直位移、角度差异更小(P<0.05)。观察组修复体的邻面接触情况、咬合度显著优于对照组,差异有统计学意义(P<0.05)。两组修复体的解剖外形、边缘适合性比较,差异未见统计学意义(P>0.05)。观察组不良反应总发生率为14.93%(10/67),明显低于对照组[45.28%(24/53)],差异有统计学意义(P<0.05)。结论 数字牙种植体印模相较于传统牙种植体印模,在临床准确性、修复效果方面表现出显著优势,并且不良反应更少。     

钛种植体表面改性的研究现状及应用进展

近年来,纯钛因其具有良好的生物相容性,而被应用于口腔种植领域,但其本身仍存在着许多问题.随着钛种植体广泛应用于临床,如何提高其种植的成功率引起了人们越来越多的关注.学者们研究了多种改善方法,其中钛种植体的表面处理对提高种植成功率起着重要作用,目前常用的表面处理方法主要包括:化学处理方法、物理方法,以及生物方法等,且不同处理方法都有其各自的优点.文章就目前国内外对钛种植体表面处理方法的研究现状及进展进行综述.     

即刻种植倾斜种植体在牙缺失修复中应用的效果分析

目的：分析牙缺失修复中采用即刻种植倾斜种植体的效果。方法：前瞻性选取开封市中心医院口腔科2021年1~12月收治的50例牙缺失患者,按照简单随机化法分为A组与B组。A组25例接受延期种植牙修复,B组25例接受即刻种植倾斜种植体修复。评估两组种植体修复效果,对比两组治疗前后种植体稳定系数（ISQ）、改良菌斑指数（mPLI）、改良龈沟指数（mSBI）、改良出血指数（mSBI）、探诊深度（PD）、红色美学评分（PES）、白色美学指数评分（WES）,统计两组种植体留存率及并发症的发生率。结果：A组修复成功21例（84.00%）,B组修复成功23例（92.00%）,两组修复成功率相比无显著性差异（P＞0.05）;两组治疗后1个月、3个月、6个月ISQ指数组间对比无显著性差异（P＞0.05）;两组治疗后3个月、6个月ISQ指数均较治疗后1个月提高（P＜0.05）;两组治疗后1个月mPLI、mSBI指数及PD、PES、WES评分对比无显著性差异（P＞0.05）;两组治疗后3个月的mPLI、mSBI指数及PD均比治疗后1个月降低,且B组低于A组（P＜0.05）;两组治疗后6个月PES、WES评分均较治疗后1个月提高,且B组高于A组（P＜0.05）;B组并发症总发生率（12.00%）与A组（16.00%）对比无显著性差异（P＞0.05）。结论：即刻种植倾斜种植体与延期种植牙修复在牙缺失修复中应用均能够获得理想的修复效果,但即刻种植获得的美学效果更佳,且更利于维持牙周组织健康,改善患者生活质量。     

天然牙联合种植体治疗牙列缺损的临床修复效果及影响因素分析

目的：探讨天然牙联合种植体治疗牙列缺损的临床修复效果及其影响因素。方法：选取莆田市荔城区医院口腔科2020年1月至2021年1月收治的牙列缺损患者76例为研究对象,均给予天然牙联合种植体治疗,分析患者临床修复效果,并进行单因素分析与Logistic多因素回归分析,分析临床修复效果的影响因素。结果：76例患者中,67例（88.16%）修复成功,9例（11.84%）修复失败。失败组年龄较成功组更大（P<0.05）,Ⅰ类牙槽骨骨质、牙周炎、种植位点感染、吸烟、骨质疏松、糖尿病、心血管疾病患者占比更高（P<0.05）;Logistic多因素分析结果显示,年龄（OR=2.596）、Ⅰ类牙槽骨骨质（OR=12.315）、牙周炎（OR=1.345）、种植位点感染（OR=8.473）、吸烟（OR=5.468）、骨质疏松（OR=4.361）、糖尿病（OR=6.371）、心血管疾病（OR=6.645）是牙列缺损患者临床修复失败的独立危险因素（P<0.05）。结论：天然牙联合种植体治疗牙列缺损的临床修复效果较好,修复失败与年龄、牙槽骨骨质、牙周炎、种植位点感染、吸烟、骨质疏松、糖尿病、心血...     

即刻种植倾斜种植体修复牙缺失的疗效观察

[目的]探讨即刻种植倾斜种植体修复牙缺失的疗效.[方法]前瞻性选择2015年1月至2017年1月在本院行单种即刻种植倾斜种植体修复牙缺失的患者18例,以术后6个月为基线,进行4年随访,随访时间点分别为放置即刻(T0)、6个月(T1)、1年(T2)和4年(T3).统计种植体成功率,比较不同时刻边缘骨水平(MBLs)、颊黏...     

种植体直径对天然牙-牙种植体联合桥应力影响

种植义齿修复伴随基础理论和临床技术的建立,已成为一项成熟的技术逐渐推广普及。1986年基于骨性结合理论,Branemark小组成员之一即Albrektsson提出了新的种植义齿成功率的标准,即5年成功率不低于85%,10年成功率不低于80%。此后种植义齿这一新技术便在全球范围内迅速发     

Mesh词表主题词扩展:牙种植体-Dental implants

A dental implant is a root device,usually made of titanium,used in dentistry to support restorations that resemble a tooth or group of teeth to replace missing teeth.Virtually all dental     

种植材料生物学特性对牙种植体生物相容性的影响

牙种植体材料主要分为:钛及其合金、生物活性陶瓷、碳和高分子材料.文章从这几种材料的生物学特性入手,介绍了这几种材料的优点及存在的问题:探讨了种植体表血形态、种植体的长度和直径对应力分布的影响;证实了种植体表面的涂层、种植体的生物力学对种植体材料的生物相容性都发挥着不同程度的作用.     

Dissolution of metal oxides in task-specific ionic liquid

Due to their typically low reactivity, the activation of metal oxides, as found in ores, earths and minerals, is in general performed by high temperature reactions, which consume much energy. Owing to the prevalence of fossil fuels, this is accompagnied by the generation of large amounts of CO₂. Alternatively, ionic liquids (ILs) can be used as solvents for metal oxide dissolution and downstream chemistry at much lower temperatures. The dissolution ability of the dry ionic liquid betainium bis(trifluoromethylsulfonyl)imide, [Hbet][NTf₂], was investigated for 30 metal oxides at 175 °C and compared to chloride containing IL [Hbet]₂[NTf₂]Cl. A general dissolution-promoting effect of chloride anions was found, regarding reaction time as well as the variety of dissolved metal oxides. Up to now, the dissolution in [Hbet]₂[NTf₂]Cl is limited to basic or amphoteric metal oxides and assumed to be influenced by multiple factors, such as reaction conditions and the lattice energy of the metal oxide as well as its crystal structure. Comprehensive investigations were performed for the dissolution of CuO, which led to the discovery of the water-free complex compound [Cu₂(bet)₄(NTf₂)₂][NTf₂]₂. Proceeding from this compound, a complete exchange of the O-coordination sphere by other ligands was demonstrated, opening up promising possibilities for downstream chemistry.

Investigation on the dissolution of 30 metal oxides in the water-free ionic liquid [Hbet][NTf₂] and the catalytic effect of chloride for the application in green ore processing.     

Visualization of osseointegration of maxilla and mandible dental implants

Purpose  

We present a new, hybrid visualization method that can assist in assessing the degree of osseointegration of dental implants.     

纳米含氟羟基磷灰石牙种植体的生物相容性

背景：有关纳米含氟羟基磷灰石牙种植体材料生物相容性的报道较少。目的：检测纳米含氟羟基磷灰石牙种植体材料的体外生物相容性。方法：采用溶胶凝胶技术分别制备羟基磷灰石与纳米含氟羟基磷灰石。①溶血性实验：在0.2 mL稀释兔抗凝血中分别加入0.01,0.15,0.2 g/L纳米含氟羟基磷灰石溶液、生理盐水及蒸馏水各10 mL,检测各组上清液吸光度值。②体外细胞毒性实验：分别以100%,50%纳米含氟羟基磷灰石浸提液、100%羟基磷灰石浸提液、苯酚溶液及RPMI1640培养液培养传至第2代的L929细胞,MTT法检测培养2,4,7 d的吸光度值。结果与结论：体外溶血性实验显示,各浓度梯度纳米含氟羟基磷灰石的溶血率均在5%以内,符合医用材料的溶血要求。体外细胞毒性实验显示,随着培养时间的增加,100%,50%纳米含氟羟基磷灰石浸提液组细胞贴壁覆盖率增加,细胞密度增高,细胞为长梭形或多角形,细胞增殖及形态与RPMI1640培养液组、羟基磷灰石组无明显差别,细胞毒性为0级。     

A method for segmentation of dental implants and crestal bone

Purpose   Medical imaging and in particular digital radiographic images offer a great deal of information to dentists in the clinical diagnosis and treatment processes on a daily basis. This paper presents a new method aimed to produce an accurate segmentation of dental implants and the crestal bone line in radiographic images. With this, it is possible computing several measures to biomechanical and clinical evaluation of dental implants positioning and evolution. Methods   The proposed segmentation method includes two major steps: (1) the preprocessing that combine denoising filters, morphological operations and histogram threshold techniques and (2) the final segmentation involving made-to-measure adjusted and trained active shape models for detecting the precise location of the intended structures. Results   Resulting measurements were compared to manual measurements made by experts on representative radiographs from patients. The calculated intraclass correlation coefficient was 0.75 and showed good reliability of the method, and the Bland-Altman analysis showed 95 % of the values within the limits of agreement. The mean of the differences between the manual and method-driven measurements was 0.049 mm ( $-0.137; -0.040$ ) 95 % CI, inferior to the established limit (0.15mm). Conclusions   It was demonstrated that the method achieved a precise segmentation of the intended structures. The validation process on standardized periapical radiographs showed good agreement between the manual measurements and the ones produced by the new method. Future work will be focused on making the method more robust to densitometry changes and to validate the method on non-standardized radiographs.     

Synthesis of anti-perovskite-type carbides and nitrides from metal oxides and melamine

Four anti-perovskite-type compounds, ZnNNi₃, ZnCNi₃, SnNCo₃, and SnCCo₃, are synthesised through reactions between metal oxides and organic compound melamine (C₃H₆N₆). ZnNNi₃ and ZnCNi₃ are selectively synthesised by choosing different reaction temperatures and nominal oxide-to-melamine ratios. SnNCo₃ is synthesised for the first time by this melamine method. Resistivity, magnetisation, and heat capacity measurements reveal that SnNCo₃ is a correlated metal with a high density of states at the Fermi level. The results demonstrate that this feasible synthetic route using melamine is useful in the search for complex metal carbides and nitrides toward novel functional materials.

Four anti-perovskite-type compounds, ZnNNi₃, ZnCNi₃, SnNCo₃, and SnCCo₃, are synthesised through reactions between metal oxides and organic compound melamine (C₃H₆N₆).     

Antibacterial prophylaxis for dental, GI, and GU procedures

Indications, drugs and dosage for prevention of endocarditis and prosthetic joint infection.     

Rehabilitation of recurrent unicystic ameloblastoma using distraction osteogenesis and dental implants

Ameloblastoma is a true neoplasm of odontogenic epithelial origin. Surgical resection of the ameloblastoma is well-documented and an accepted treatment modality. Vertical distraction of the alveolar process is an efficient method for augmentation. This method of providing additional bone and soft tissue for implant placement is becoming more common. This clinical report describes the use of distraction osteogenesis and fixed implant supported prosthesis to treat a post-surgical alveolar defect as a result of the resection of a unicystic ameloblastoma in the anterior mandibular region. As a result of alveolar distraction a segment of mature bone was transported vertically in order to lengthen the crest, for better implant anchorage. Further clinical and experimental studies of the technique with long-term follow-up are needed, to confirm bone and implant stability, as it relates to alveolar height.     

Properties of titanium dental implants produced by electro-discharge compaction

Highly porous dental implants of a cylindrical shape were fabricated from commercial grade titanium REP-atomized powders by EDC. They were intended to have the maximum porosity for maximum osseointegration, but to maintain the minimum mechanical properties functionally required. Two level full factorial experiments were conducted with respect to the sample weight, capacitance, input energy and electrode configuration. All samples were X-rayed prior to tests to ascertain the presence, extent and distribution of internal macroscopic voids. Torque and compression tests were conducted to evaluate the yield or ultimate strengths (34-90 cm N and 205-502 MPa, respectively). These results indicate that macroscopic void-free, highly porous implants can be fabricated.     

不同材料烤瓷冠在后牙种植修复中的对比

背景：种植体上部结构牙冠材料的选择十分重要,其临床修复效果直接影响到种植体的寿命和患者的牙周健康状况。目的：比较Lava氧化锆全瓷、金铂合金烤瓷与银钯合金烤瓷冠在后牙单颗缺失口腔种植修复中的临床效果。方法：选择60例120颗第一磨牙缺失病例,完成单颗牙缺失种植牙修复治疗,上部结构修复牙冠材料分别为Lava氧化锆全瓷冠、金铂合金烤瓷冠与银钯合金烤瓷冠,每种材料40颗,比较3种修复体的临床修复效果。结果与结论：通过6-48个月的随访发现,Lava氧化锆全瓷冠组和金铂合金烤瓷冠组的牙龈边缘着色、龈缘密合度、修复体颜色优于银钯合金烤瓷冠组,Lava氧化锆全瓷冠组的牙龈边缘着色和修复体颜色优于金铂合金烤瓷冠组,金铂合金烤瓷冠组的龈缘密合度优于Lava氧化锆全瓷冠组;银钯合金烤瓷冠抗折程度最强,最具临床优越性,但其牙龈指数最高,牙龈健康程度最差,菌斑形成速度最快、程度最重。由此可见,在种植修复完成后需要选择较为适合的冠部修复体进行种植修复,Lava氧化锆全瓷冠具有卓越的生物相容性,而金铂合金烤瓷冠在边缘密合性方面更具优势,此两种修复体在临床治疗中具有一定的优势。