共查询到20条相似文献,搜索用时 58 毫秒
1.
不同牙位、部位的牙体组织构成与牙体形态的差异决定了不同牙位、部位牙冠颜色的差异 ,深入研究牙冠颜色的变化规律对临床修复的比色、配色有重要意义。本项研究应用人体牙齿颜色测量系统对我国西南地区 194 4枚前牙进行测量 ,分析了不同牙位、部位牙冠颜色的差异。1.材料和方法 :采用CIEL a b 色度参数 ,应用人体牙齿颜色测量系统对出生于中国西南地区的 16 2名志愿者的上下前牙中 1/ 3、切 1/ 3与颈 1/ 3进行颜色测量。比较 3个位置之间、上颌前牙之间、下颌前牙之间、上下颌同名前牙之间以及对侧同名牙之间L 、a 、b 值的… 相似文献
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患儿女,4岁,因6 1牙冠发红1个月,出血1d来就诊。患儿母亲1个月前发现患牙牙冠发红,当时无自觉症状,未做处置。2d前,患牙出现咀嚼痛,1d前患牙牙冠出血。既往患牙无任何不适,亦无外伤史。检查:6 1牙冠呈粉红色,形态基本完整,舌窝中央处有针尖大小破裂点,露髓,探痛明显,探触溢血,且溢血较多。患牙无龋损,叩诊(- ) ,松动(- ) ,牙龈组织无充血、肿胀。X线片示:6 1髓室扩大,约占牙冠体积的2 / 3,髓室壁薄,边缘不规则,牙根发育良好,尖周组织无明显异常,与对侧同名牙的牙根形态近似。71髓室、根管形态均完整清晰。印诊:6 1髓室内吸收致牙冠破裂。处… 相似文献
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目的:评价牙周基础治疗及牙冠延长术治疗前牙不良冠修复所致牙周病的临床疗效。方法:选取30例前牙冠修复所致牙周病患者共105颗患牙,均采用牙周基础治疗及牙冠延长术后再行冠修复,观察不同时段临床冠长度的变化,记录各相关牙周指数并进行分析,评估术后全冠修复的临床效果。结果:术后短期内临床冠长度增加效果确切,治疗组术后的各项牙周指数均优于术前(P<0.05),与对照组比较无明显差异(P>0.05),在1年的观察期内保持相对稳定(P>0.05);全冠修复体的固位良好,边缘密合,龈缘与冠缘的位置关系相对稳定。结论:牙周基础治疗及牙冠延长术有利于不良冠修复所致牙周病的治疗,且冠延长术解决了生物学宽度的问题,确保了牙周健康的长期稳定。 相似文献
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255例牙冠折裂的临床分析 总被引:2,自引:0,他引:2
目的分析长期咀嚼过程中牙冠折裂的发生情况,并初步探讨冠折发生的相关因素。方法以2005年12月-2007年12月在兰州市第一人民医院口腔科就诊的255颗冠折牙为研究对象,对折裂牙的患者性别、年龄、牙位、折裂位置及形态等进行分析。结果255颗冠折牙中,1)上颌第一磨牙76颗(29.8%),下颌第一磨牙45颗(17.6%),上颌第二磨牙41颗(16.1%),下颌第二磨牙37颗(14.5%),上颌第二前磨牙32颗(12.5%),上颌第一前磨牙15颗(5.9%),下颌第二前磨牙9颗(3.5%);2)折裂位置与窝沟重叠者158颗(62.0%),发生于牙尖斜面者97颗(38.0%)。3)正常者85颗(33.3%),面形态异常者55颗(21.6%),型异常者115颗(45.1%)。结论牙位及形态等与牙冠折裂的发生具有一定的关系。力是牙冠折裂的基本因素,但不是唯一因素。 相似文献
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目的:临床观察利用种植体与畸形邻牙联合修复治疗缺失牙。方法:治疗前牙区缺失牙,用种植体与畸形邻牙牙冠,包括小牙、锥形牙、滞留无松动的乳牙、过度磨损变色或牙冠缺损等经治疗后的前牙联合治疗。结果:治疗能修复失牙;改善形牙冠;克服种植体的旋转移位;能增进美观又能达到较好的种植效果。结论:这植联合修复可以治疗缺失牙和邻近的畸形牙。 相似文献
7.
目的:比较正常牙合与安氏Ⅱ1类错牙合模型上下颌临床牙冠中心高度,为安氏Ⅱ1类错牙合矫治设计提供参考。方法:收集正常牙合,安氏Ⅱ1类错牙合模型各50例,用数显游标卡尺分别测量各组模型的临床牙冠高度并计算出临床牙冠中心高度,进行对比分析。结果:安氏Ⅱ1类错牙合组上下颌临床牙冠高度及临床牙冠中心高度均较正常牙合组小,大部分测量值间的差异有统计学意义。结论:安氏Ⅱ1类错牙合畸形患者正畸治疗中应注意托槽定位,以期获得更完美的咬合状态。 相似文献
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目的 探讨并观察对死髓牙牙冠劈裂后进行再修复,提高牙齿保存率的方法,方法 将56颗劈裂牙重做根管治疗,然后做全冠修复,结果 经1-3年的临床观察,成功率为76.79%,94.64%的牙齿具有咀嚼功能。结论 对具备适应症的牙冠嬖裂的死髓牙可以进行保存治疗和修复,并可达到较满意的临床效果。 相似文献
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乳磨牙预成冠的临床应用 总被引:2,自引:0,他引:2
自1968年Mink及Bennett等成功地运用合金预成冠对乳磨牙及第一恒磨牙的广泛龋坏缺损进行牙体修复以来,在国外儿童牙科逐步推广应用,成为儿童牙体修复的先进技术。Dawson等(1981)的研究报告中指出: 相似文献
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目的:收集华北地区上颌第一乳磨牙形态数据,分析其形态特征.方法:使用3d扫描仪对116名儿童重建上颌第一乳磨牙,使用Creo 2.0测量软件测量牙冠最大近远中径、颊舌径、冠指数、冠面积、冠周径、冠高等.结果:获得了华北地区上颌第一乳磨牙冠周径频数表和各检测项医学参考值范围.最大近远中径、颊舌径、冠面积、颌面周径、最大周... 相似文献
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Satu Apajalahti Päivi Hölttä Lauri Turtola Sinikka Pirinen 《Acta odontologica Scandinavica》2013,71(1):56-59
Short-root anomaly (SRA), occurring mostly in maxillary incisors, is defined as developmentally very short, blunt dental roots. The condition has a genetic background and is related to hypodontia. Earlier population studies have been based on schoolchildren with developing dentitions and have indicated prevalence figures between 1% and 10%. We studied a random sample of existing panoramic radiographs of 2000 university students for SRA. Roots as long as or shorter than the crowns in the incisors and visually evaluated as very short, blunt roots bilaterally in the posterior teeth were classified as SRA. The prevalence was 1.3%. According to anamnestic information, half the SRA patients had undergone orthodontic therapy, but pre-treatment radiographs were unavailable. In 70% of the SRA patients the short-rooted tooth pairs were upper incisors, but also involved were maxillary premolars, lateral incisors, and lower second premolars. Women were significantly more often affected. We discuss other factors known to cause short-rooted teeth and conclude that the population prevalence for genetic SRA in fully developed dentitions is close to our 1.3%. 相似文献
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Marjatta Nyström Liisa Aine Leena Peck Kaarina Haavikko Matti Kataja 《Acta odontologica Scandinavica》2013,71(2):49-56
Development of teeth was studied from 2483 dental panoramic tomograms of 1651 healthy Finns ranging in age from 2 to 25 years. Dental maturity was assessed using a method based on developmental stages of 7 left mandibular teeth. We give sex-specific tables of maturity scores as a function of ages and of ages as a function of maturity scores. Also generated are percentile graphs for visual evaluations of dental maturity in children and adolescents. Since maturity scales do not tolerate any missing data, a great limitation for their use, we have developed linear regression models for predicting the formation stages of each of the 7 mandibular teeth. It was easiest to predict the formation stage of the mandibular first molars (correct in 87% within the study material) and most difficult to predict second molars and second premolars (correct in 69% and 70%, respectively). We expect the data and formulae presented in this study to prove useful in research and in clinical and forensic dentistry. 相似文献
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目的:调查距今约1 100~1 300年前古人牙齿的磨耗状况,以探求牙齿磨耗的发生发展趋势。方法:观察记录62例陕西长安区出土1 000年前人骨架的全部牙齿的磨耗状况,并进行统计学分析。结果:不同磨耗程度牙齿的构成比中,2度磨耗的比例最高(36.80%)。尖牙和第一磨牙的磨耗程度最重,第三磨牙的磨耗程度最轻。所有上下对称牙位牙齿之间的磨耗程度及上下颌牙齿总的磨耗程度差异均没有显著性(P>0.05)。随年龄的增长,牙齿磨耗程度逐渐加重(P<0.05)。男性各牙位牙齿的磨耗程度均高于女性(P<0.05)。结论:本研究反映了1 000年前古人牙齿磨耗的一般状况;分析了不同时期饮食结构、模式与牙齿磨耗之间的相互关系和演化发展规律。 相似文献
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目的:从临床疗效、牙周愈合情况两方面探索微创拔牙技术对拔牙再植法治疗纵折后牙成功率影响。方法:来我院诊治的符合适应症的纵折后牙共50例进行拔牙再植法的治疗,局麻下拔除折裂牙,其中25例常规拔牙作为对照组,25例使用微创拔牙,然后在体外粘结,再植入牙槽窝,术后2周临时冠修复。定期复查,根据临床表现、牙周状况分级,统计分析。结果:拔牙过程中,对照组断根2例,而微创组无断根,2年随访成功率分别为对照组56%和微创组84%,对照组牙周膜愈合(4%)明显少于骨粘连愈合(72%),而微创组牙周膜愈合达44%,与骨粘连愈合(52%)接近。结论:拔牙再植法是一种保存纵折后牙的有效方法,微创拔牙技术有利于再植后的牙周愈合及预后。 相似文献
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Hugo Gaêta-Araujo Matheus Bronetti da Silva Camila Tirapelli Deborah Queiroz Freitas Christiano de Oliveira-Santos 《The Angle orthodontist》2019,89(5):781
Objectives:To evaluate and compare the detection of gubernacular canals (GC) and their characteristics in normal and abnormal tooth eruption.Materials and Methods:Patients with unerupted teeth were classified according to sex and age. Each tooth was classified according to dental group, eruption status, formation status, angulation, and GC detection. The opening of the GC in the alveolar crest and the attachment sites in relation to the dental follicle were assessed. Data were analyzed by the chi-square and Kruskal-Wallis tests, with a significance level of 5%.Results:Cone-beam computed tomography scans of 159 patients were evaluated. The final sample (N = 598) consisted of 423 teeth with normal eruption, 140 impacted teeth, and 35 teeth with delayed eruption. The overall detection rate of GC was 90.6%. These rates were 94.1%, 87.1%, and 62.9% for normal eruption, impacted teeth, and delayed eruption, respectively. GC detection rates were higher in the early stages of tooth formation in normal tooth eruption and in impacted teeth. The rate of GC detection was even lower in delayed teeth when they were angulated. Unusual attachment sites of the GC to the dental follicle were associated with abnormal eruption status.Conclusions:The results of the present study suggest that GC characteristics may indicate an abnormal eruption status. 相似文献
16.
Background
It is unclear whether or not untreated bounded edentulous spaces (BES) can cause patients problems because of migration of unopposed and adjacent teeth.Objectives
To quantitatively assess BES-related occlusal changes and the level of evidence available.Material and methods
A systematic search of the literature was conducted in triplicate in the PubMed and Cochrane Register of Controlled Trials (CENTRAL) databases up to and including February 2010 to assess studies related to the topic. The LILACS database also was searched by one of the authors (CMF). Quantitative mesio-distal changes and overeruption were the outcome measures. Manual searching of the reference lists of studies retrieved from the electronic databases was also conducted. Google Scholar in English, French, German, Greek, Italian, Portuguese, and Spanish was also searched to retrieve potential studies. Grey literature was searched in OpenSIGLE (System for Information on Grey Literature in Europe) for more potential papers. The quality of the retrieved literature and the strength of recommendations were assessed by use of the GRADE system. A decision-tree-like scheme was produced to depict treatment options.Results
The available evidence demonstrated that for most cases occlusal changes in BES after tooth loss might be limited (on average up to 2 mm). The quality of evidence was regarded as very low, however.Conclusions
Tooth replacement should not necessarily be regarded as the mainstay of therapy for posterior BES, although more robust studies are necessary to clarify the long-term effects of non-treatment. The GRADE approach may be useful for enhancing the transparency of the decision-making process in dentistry, especially when evidence of only limited quality is available. 相似文献17.
目的:探讨折裂磨牙的分类及手术拔除方法。方法:统计分析486例折裂磨牙的折裂类型,在拔除方法上随机分为实验组和对照组,实验组386例先用牛角钳拔,对照组100例先用磨牙钳拔。对牙钳夹碎牙冠后的残留部分,先分根再分别挺出;对残留的牙根分别采用普通牙挺或根尖挺、三角挺挺出;对于残留牙槽窝内位置较深的断根,采用根尖挺或翻瓣去骨的办法拔除,统计各种方法拔除牙的数量。应用SPSS13.0软件包对数据进行多元方差分析。结果:上颌磨牙以纵折为主,下颌磨牙以斜折为主。上颌第一磨牙用牛角钳和磨牙钳完全拔除率分别是35%(50/143)和12.5%(8/40),差异有显著性(P=0.041);上颌第二磨牙用牛角钳和磨牙钳完全拔除率分别是40%(30/75)和23.5%(4/17),差异有显著性(P=0.016);下颌第一磨牙用牛角钳和磨牙钳完全拔除率分别是37.5%(45/120)和21.4%(6/28),差异具有显著性(P=0.004);下颌第二磨牙用牛角钳和磨牙钳完全拔除率分别是48%(23/48)和20%(3/15),差异无显著性(P=0.662)。结论:对于折裂磨牙的拔除,应首选牛角钳,约40%的牙可以完整拔除,70%以上的牙可以不同程度地拔除,然后再选用牙挺或三角挺拔除残留牙根;对个别残留较深的断根,采用根尖挺或翻瓣去骨法拔除。按此流程操作,可以快速拔除折裂牙,减少创伤,减少手术时间,减轻患者痛苦。 相似文献
18.
高压氧用于年轻恒牙再植术的临床研究 总被引:16,自引:1,他引:15
目的 探讨年轻恒牙脱位再植后,高压氧(hyperbaric oxygen,HBO)治疗对牙髓牙周损伤修复的作用。方法 对69例年轻恒前牙脱位患者的138颗患牙行再植术,术后分为HBO组和对照组,HBO组给予HBO治疗10d,对照组不给予HBO治疗,进行对照。结果 HBO组和对照组的牙再植总成功率分别为97.26%和70.77%,二者差异有显著性(P〈0.05);1年后失牙情况;HBO组1颗(1.3 相似文献
19.
甄敏;危伊萍;胡文杰;荣起国;张豪;孔繁军 《中华口腔医学杂志》2016,51(6):362-367
目的 构建上中切牙不同冠根折类型行改良冠延长术后桩核冠修复的三维有限元模型,研究术后牙齿应力大小和分布情况,从力学角度对比分析常规和改良牙冠延长术的适应证。 方法 采用显微CT扫描技术和三维激光扫描技术、DICOM数据直接建模法、逆向工程技术和有限元法,构建9种上中切牙冠根折类型行改良冠延长术后桩核冠修复的三维有限元模型(简称不同改良冠延长术模型),分析牙体、牙周和修复体各结构(牙本质、牙周膜、牙槽骨、桩、核)的等效应力(von Mises stress)峰值及其分布位置、牙周膜面积、牙周膜极限阈值,并与本课题组既往研究中常规冠延长术模型的相关结果进行比较。 结果 不同改良牙冠延长术模型中不同结构的等效应力大小:牙本质>桩>核>牙槽骨>牙周膜;牙本质的应力峰值(44.37~ 80.58 MPa)出现在舌侧中央肩台处;改良冠延长术术后牙周膜面积减少了6%~28%,在相同折裂条件下,改良冠延长术模型保留的牙周膜面积大于常规冠延长术模型;改良冠延长术模型中仅B3L1m、B3L2m、B3L3m模型的牙周膜应力超过了牙周膜的极限阈值,而常规冠延长术模型中的B2L2c、B2L3c、B3L1c、B3L2c、B3L3c模型的牙周膜应力均超过了牙周膜的极限阈值。 结论 改良冠延长术较常规法保留了相对多的牙周支持组织,有利于术牙的远期疗效;改良冠延长术的适应证范围大于常规冠延长术;唇侧折裂平齐龈缘且舌侧折裂至牙槽嵴顶及其根方的上前牙冠根折不是改良冠延长术的适应证。 相似文献