牙根吸收

牙根吸收 , 【Key words】 root resorption Orthodontics CBCT Tooth movement , Intrusion and Extrusion 牙齿升高与压低移动; , facial type 面型 14. Faltin RM, Faltin K, Sander FG, Arana-Chavez VE. Ultrastructure of cementum and periodontal ligament after continuous intrusion in humans: a transmission electron microscopy study. Eur J Orthod. 2001;23:35–49. 【正题名】:Apical root resorption comparison between Frankel and eruption guidance appliances. 【作者】:Janson,G; Nakamura,A; de-Freitas,MR; Henriques,JF; Pinzan,A 【作者单位】:Department of Orthodontics, Bauru Dental School, University of Sao Paulo, Sao Paulo, Brazil. jansong@travelnet.com.br publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics 【刊名】:American Journal of Orthodontics and Dentofacial Orthopedics 【年卷期】:vol.131 【出版年】:2007 【ISSN】:0889-5406 【期号】:no.6 【页码】:P.729-735 【总页数】:7 【分类号】:R78 【关键词】:Malocclusion, Angle Class II; Orthodontic Appliances, Functional; Root Resorption; 错|HE|, 安 氏?类; 正畸矫治器, 功能性; 牙根吸收 【正文语种】:eng 【文摘】:INTRODUCTION: The objectives of this study were to compare the amounts of apical root resorption that occur after treatment with 2 removable appliances-the Frankel function regulator and the eruption guidance appliance (EGA)-in an untreated control group, and to determine the prevalence of root resorption in the maxillary and mandibular incisors and the dental arches. METHODS: After treatment, periapical radiographs were obtained of the maxillary and mandibular incisors with the long-cone paralleling technique from 72 patients divided into 3 groups. Group 1 included 24 patients treated with the Frankel appliance, group 2 consisted of 24 patients treated with the EGA, and group 3 comprised 24 untreated subjects. Some patients in groups 1 and 2 were also treated with fixed appliances. Subgroups of patients who had used exclusively 1 functional appliance were also formed and evaluated. Root resorption was scored according to the method of Levander and Malmgren. RESULTS: Results of the Kruskal-Wallis testsshowed significantly greater resorption in the Frankel group, the EGA group, and the EGA subgroup in relation to the control group. However, there were no statistically significant differences between the Frankel and the EGA groups and the subgroups. The amounts of resorption were predominantly small and similar in the experimental groups and the subgroups. The prevalence of resorption for the incisors was greatest for the maxillary central, followed by the maxillary lateral, mandibular central, and mandibular lateral. CONCLUSIONS: It was concluded that the Frankel group, the EGA group, and the EGA subgroup had significantly greater resorption than the control group. There was no difference in the amount of resorption between the Frankel and the EGA groups. 馆藏单位: 中国医学科学院图书馆 固定正畸后牙根吸收的部分影响因素分析 姜若萍 张丁 傅民魁 【摘要】 目的 研究影响正畸治疗后牙根吸收的部分临床因素。方法 随机选择经过固定正 畸治疗,有清晰可辨的矫治前后全口曲面断层片者96 例。以改良根吸收分级法评估每名患者矫治前 后全口牙齿根吸收情况。通过多元方差分析及多元回归分析,探讨正畸后平均根吸收值( root resorption after treatment ,RRAT ) 与性别、年龄、减数与否、部位、疗程和治疗前平均根吸收值( root resorption before treatment ,RRBT ) 的关系。结果 ?女性RRAT 校正均值为0141 ,男性为0134 ,差异有 高度显著性( P < 0. 05) 。?拔牙组的RRAT 校正均值为0143 ,未拔牙组为0131 ,差异有高度显著性 ( P < 0. 001) 。?前牙区RRAT 校正均值为0159 ,后牙区为0112 ,差异有高度显著性。?上牙RRAT 校正均值为0140 ,下牙为0137 ,差异无显著性。?RRAT 与年龄、疗程及RRBT 呈正相关,复相关系数 R = 0159 ,判定系数R2 = 0135。结论 性别、年龄、减数与否、疗程、部位及治疗前牙根状况对正畸治疗 后牙根吸收均有影响。 【关键词】 牙根吸收; 正畸; 牙移动 青少年正畸治疗中影响牙根吸收的因素探讨 林焱, 钟萍萍, 张端强 (福建医科大学口腔医学院正畸科, 福建福州350002) [摘要] 目的:探讨影响青少年错!畸形患者正畸矫治后牙根吸收的相关因素。方法:选择已完成正畸固定矫治的青少 年患者78 例, 在其矫治前后的曲面断层片上, 对4 个上切牙进行根尖形态的分析, 以获得正畸矫治后牙根吸收的定 性数据。在对受试者按年龄、性别、牙位、牙龄、拔牙与否及疗程分组后, 利用SPSS12.0 软件对所得数据进行非参数检 验分析。结果:所有正畸患者都存在一定程度的牙根吸收, 根尖形态分析显示: ?牙龄?A 期患者比?C 期的患者存 在更严重的牙根吸收(P<0.01),但按年龄比较不存在显著差异; ?拔牙组比不拔牙组有更加严重的牙根吸收(P<0.01); ? 疗程越长, 牙根吸收也越明显(P<0.05); ?牙根吸收的严重程度与性别及上切牙牙位之间无相关性。结论:在第二恒磨 牙完全建!前( ?A 期前) 进行正畸治疗、不拔牙矫治、缩短矫治疗程, 均可以减少正畸治疗中的牙根吸收。 [关键词] 牙根吸收; 正畸治疗; 青少年 [Key words ] Root resorption; Orthodontic treatment; Adolescents 正畸治疗中拔牙与牙根吸收关系的临床研究 李春雷’ 李长霞王大为张春元 摘要」目的评价拔牙对正畸治疗中的牙根吸收的影响。方法选取例年龄在一岁经方丝弓矫治器固定矫治治 疗的青少年, 分为拔牙组和不拔牙组, 两组病人治疗前后分别拍摄全日曲面断层片, 牙根形态按等级分级, 计算机进行统讨 一分 析各等级频数分布变化。结果两组病例在治疗后牙根吸收均以、级居多拔牙组治疗后牙根、级吸收多于未拔牙组, 两组之间的差异有显著性尸。结论拔牙治疗会加重正畸治疗中的牙根吸收 〔关键词〕正畸拔牙牙根吸收牙根等级全口曲面断层片 正畸治疗前后牙根吸收的临床研究 姜若萍张丁傅民魁 摘要】目的调查正畸治疗前后牙根吸收的临床特征。方法随机选择至少经过十二个月固定 正畸治疗, 有清晰可辨的矫治前后全口曲面断层片的病例例, 用根吸收分级评估法记录每人矫治前后 全口牙齿根吸收情况, 并统计分析。结果正畸治疗前的牙齿存在根吸收, 治疗后的牙 齿有程度不等的根吸收治疗前的根吸收绝大部分为轻度, 治疗后仍以轻度吸收为主, 但也有部分中 重度吸收治疗前的根吸收主要在上领前牙区治疗后根吸收上下领没有显著性差异, 但前牙明显高 于后牙。结论正畸后的根吸收较为常见大部分正畸过程中的牙根吸收是可接受的正畸治 疗后有一部分牙齿出现重度根吸收, 主要分布于上前牙, 成为危害患者颜面美观及功能的隐患, 应引起足够的重视。 【关键词】根吸收正畸治疗 正畸治疗中不同治疗时间对支抗牙根 吸收影响的临床研究 李春雷 李长霞 朱双林 摘 要 目的:探讨不同的治疗时间在正畸治疗中对支抗牙根吸收的影响。方法:选用160 例经方丝弓矫治 器固定矫治治疗的病人,分为长期组和短期组两组,每组病人治疗前后分别拍摄头颅侧位定位片,配对测量正畸治 疗前后支抗牙根长度,将牙根长度改变量进行统计分析,并评价牙根吸收情况。结果:长期组和短期组正畸治疗前 后支抗牙根长度改变有统计学意义( P < 01001) 。但两组之间不同的吸收量除了上前牙支抗组有统计学意义( P < 011) 外,其余各组均没有统计学意义( P > 0105) 。结论:在正畸治疗中不同治疗时间对前后支抗牙根吸收的影响有 一定的差异。 关键词 牙根吸收 正畸学,矫正 牙根长度 头颅侧位定位片 【Key words】 Root resorption Orthodontics , corrective Root Lenth Cephalograms 正畸治疗时,易受影响的牙大致顺序是:上中切牙、上侧切 牙、下颌切牙、下颌第一磨牙远中根、下颌第二前磨牙和上颌第 二前磨牙[3 ] 。 以往的研究表明，年龄因素并不是造成 牙根吸收的关键因素，它的影响是有限的，而治疗时间、矫 治力、矫治器类型、弓丝材料、牙齿移动的类型和距离等却 是相对重要的因素,4-5, ,4, 李长霞. 正畸治疗中年龄因素对牙根吸收影响的研究,J,. 广 东牙病防治，2002，10(2):102 - 105. ,5, 齐娟，毛靖.正畸治疗过程中的牙根吸收与相关的临床治疗因 素,J,. 临床口腔医学杂志，2004，20(2):124 - 125. 前牙相对于后牙容易引起 根吸收,且上颌前牙更易造成根尖吸收。正畸治疗 时,易受影响的牙大致顺序是:上颌中切牙、上颌侧 切牙、下颌切牙、下颌第一磨牙远中根、下颌第二前 磨牙和上颌第二前磨牙 正畸治疗导致的牙 根吸收一般主要发生在上下颌前牙,切牙易吸收的 顺序是上中切牙、上侧切牙、下中切牙、下侧切 牙[4 ] 。但也有人认为上下前牙无差异 4 Sameshima GT , Sinclair PM. Predicting and preventing root resorption: Part I. Diagnostic factors. Am J Orthod Dentofacial Orthop ,2001 ,119 (5) :505 - 510. 2. 4. 3 力的作用方向 有研究表明[ 19 ] ,对牙齿施加压低的力会引起更 多的牙根吸收。施加压低力的牙齿会多出0. 4 mm 的牙根吸收。然而,若施加轻的压低力,根吸收的程 度是可以忽略的。转矩力是诱导牙根吸收的另一个 直接因素,有学者[ 20 ]通过对前磨牙施加根舌向转 矩,发现根吸收发生在舌侧根尖1 /3处和颊侧根中 1 /3处,且吸收程度与力矩和作用时间有关 [ 19 ] Costopoulos G, Nanda R. An evaluation of root resorp tion inci2 dent to orthodontic intrusion[ J ]. Am J O rthod Dentofac O rthop, 1996, 109 (5) : 543 - 548 [ 20 ] CasaMA, Faltin RM, Faltin K, et al. Root resorp tions in upper first p remolars after app lication of continuous torque movement. Intra - individual study[ J ]. J O rofacO rthop, 2001, 62 (4) : 285 - 295 牙根吸收与牙根形态密切相关[ 23 ] ,不正常的 牙根形态更易引起根吸收,较细的牙根引起更多的 根吸收。治疗前6个月有明显根吸收者在以后的 治疗中更易有根吸收。大多数学者认为与发育完 成的牙齿相比较,未发育成熟的牙齿极少出现牙根 吸收的情况[ 24 ] [ 23 ] Jon A, Isolde S, Faraj B, et al. Ap ical root resorp tion six and 12 months after initiation of fixed orthodontic app liance therapy [ J ]. Angle O rthod, 2005, 75 (6) : 919 - 927 [ 24 ] 曾祥龙. 现代口腔正畸学诊疗手册[M ]. 北京:北京医科大 学出版社, 2000. 141,143 Owman2Moll等[ 2 ]研究发现,矫治力去除之后2 周和5 周,分别有38%和82%的人类前磨牙牙根吸收发生修复。 2 Owman2Moll P, Kurol J1 The early reparative p rocess of orthodontically induced root resorp tion in adolescents22location and type of tissue. Eur J Orthod, 1998, 20 (6) : 72727321 最近研究证实低强度的脉冲超声可减少牙根吸收,通过 修复牙骨质可加速根吸收的愈合,其可刺激生长因子产生, 骨蛋白上调,具有抗炎作用,促进牙体组织形成,减少吸收陷 窝表面积和吸收腔隙,促进牙根吸收的修复[ 18 ] 18 El2Bialy T, El2Shamy I, Graber TM1 Repair of orthodontically induced root resorp tion in ultrasound in humans1 Am J Orthod Dentofacial Orthop, 2004, 126 (2) : 18621931 0851 Diagnosis of orthodontically induced root resorption by orthopantomography and cone-beam-CT C. GIANNOPOULOU, A. DUDIC, M. LEUZINGER, A. MOMBELLI, and S. KILIARIDIS, School of Dental Medicine, University of Geneva, Switzerland Objectives:To compare panoramic radiography (OPT) with cone-beam-CT (CBCT) in evaluating apical root resorption after orthodontic tooth movement. Methods: The study sample comprised of 246 teeth in 22 patients who had completed orthodontic treatment with fixed appliances.Two calibrated examiners assessed blindly the presence or absence and the severity of apical root resorption on the OPT obtained after treatment and the corresponding reconstructed CBCT images. The degree of resoprtion was assessed using grades from 0 to 3, corresponding to no, mild, moderate and severe root resorption, respectively. To compare the differences between the two methods (OPT vs CBCT), the Pearson's Chi-Square test was performed. Results: On the OPT, 4% of the teeth could not be evaluated.Significant differences were detected between the two methods, the OPT underestimating the presence and severity of root resorption, as presented in the Table (p<0.001). no mild moderate severe Degree of resorption 40% 38% 16% 2% OPT 22% 47% 28% 3% CBCT Conclusion:Apical root resorption after orthodontic tooth movement, is underestimated when evaluated on OPT. Seq #89 - Orthodontics 11:30 AM-1:00 PM, Friday, September 12, 2008 Queen Elizabeth II Conference Centre Poster Hall 1 Back to the PEF IADR 2008 Program Back to the Pan European Federation of the International Association for Dental Research (September 10-12, 2008) Top Level Search Clinical indications for digital imaging in dento-alveolar trauma. Part 2: root resorption. ORIGINAL ARTICLE Dental Traumatology. 23(2):105-113, April 2007. Cohenca, Nestor 1; Simon, James H. 2; Mathur, Aeshna 2; Malfaz, Jose Maria 2 Abstract: Common complications of dento-alveolar trauma are pulp necrosis, pulp canal obliteration, periapical pathosis and root resorption. Different types of root resorption have been identified with traumatic injuries. Repair-related (surface), infection-related (inflammatory), ankylosis-related (osseous replacement) or extraradicular invasive cervical resorption are among the most common. Recent developments in imaging systems have enabled clinicians to visualize structural changes effectively. The diagnosis and three-dimensional imaging assessment of the resorption is important in order to determine the treatment complexity and expected outcome based on the location and extension of the root defect. This article discusses and illustrates the clinical application of cone beam computed tomography for diagnosis and treatment plan of root resorption. Four clinical cases are presented to illustrate the potential use of the NewTom 3G for root resorption. Copyright (C) 2007 Blackwell Publishing Ltd. Three-dimensiona evaluations of supernumerary teeth多生牙 using cone-beam computed tomography for 487 cases Deng-gao Liu, SMDa, Wan-lin Zhang, DDSa, Zu-yan Zhang, DDS, PhDb, Yun-tang Wu, DDSb, Xu-chen Ma, DDS, PhDc Received 23 December 2005; received in revised form 24 March 2006; accepted 28 March 2006. published online 04 August 2006. Purpose The purpose of this article is to introduce the use of cone-beam computed tomography (CBCT) for evaluation of supernumerary teeth. Methods The study group comprised 487 patients with a total of 626 supernumerary teeth who were examined by CBCT. Patient characteristics were recorded, and the number, location, shape, and 3-dimensional position of the supernumeraries were analyzed. The ability of CBCT to visualize dental and skeletal structures relative to supernumerary teeth was also evaluated. Results Males were affected more than females in a ratio of 2.64:1. Seventy-two percent of the patients had 1 supernumerary tooth, 27.3% had 2, and 0.6% had 3 supernumeraries. Supernumerary teeth were most frequently located in the anterior maxilla (92%), and their sagittal location relative to the neighboring teeth could be used for classification purposes. Supernumeraries were most commonly conical in shape (83.5%). CBCT yielded accurate 3-dimensional pictures of the dental and bony structures. The sagittal positions of the 578 supernumerary teeth in the anterior maxilla were divided into 6 types, of which types I and III were most commonly associated with local malocclusions. Moreover, 43.4% of the premaxillary supernumeraries were inverted and 21.1% were transversely oriented. Conclusions CBCT imaging yields accurate 3-dimensional pictures of local dental and bony structures, which is helpful for pretreatment evaluation of supernumerary teeth. The use of cone beam computed tomography in the management of external cervical resorption lesions. CLINICAL SECTION International Endodontic Journal. 40(9):730-737, September 2007. Patel, S. 1,2; Dawood, A. 2 Abstract: Aim: To report the use of cone beam computed tomography in the assessment of external cervical resorption lesions. Summary: Asymptomatic external cervical resorption lesions were diagnosed radiographically in two patients. Clinical examination in both cases was unremarkable. Cone beam computed tomography scans revealed the true nature of the lesions in three dimensions. The resorption lesion in case 1 was confined predominantly to the buccal aspect of the root, the lesion had not perforated into the root canal. A mucoperiosteal flap was raised to gain access to the lesion, the resorptive lesion was excavated and the defect repaired with glass ionomer cement. In case 2 the cone beam computed tomography scan revealed that the resorptive lesion was more extensive than it appeared radiographically, making the prognosis of reparative treatment very poor. In this case, the patient was advised to have the tooth extracted. Key learning points: Diagnosis of artificially induced external root resorption using conventional intraoral film radiography, CCD, and PSP: an ex vivo study. Oral and maxillofacial radiology Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, & Endodontics. 106(6):885-891, December 2008. Kamburo[latin small letter g with caron]lu, Kcvanc DDS, MSc, PhD a,b; Tsesis, Igor DMD c; Kfir, Anda DMD c; Kaffe, Israel DMD a Abstract: Objective: To compare diagnosis of artificially induced external root resorption cavities using conventional intraoral film radiography (Kodak Insight), CCD sensor (Sopix wireless) and PSP sensor (Orex Digident). Study design: Two mandibles were obtained from cadavers and teeth extracted from their alveolus. Artificial external root resorptions were simulated using ISO 0.5 mm, 0.8 mm, and 1.2 mm diameter round burs by drilling to the entire depth in different locations at the cervical, middle, and apical thirds of the proximal and buccal root surfaces of 6 teeth in increasing order. Conventional and digital radiographs were obtained from 3 different views of each tooth in 3 steps (small = 0.5 mm; medium = 0.8 mm; and large = 1.2 mm diameter round burs). Three observers examined all images for the presence of resorption cavities. In the first session, each image was evaluated separately; in the second, examiners had access to all views. Data were statistically analyzed using 4-way analysis of variance. Pair-wise comparison between receptors, projection views, size, and location were made by Tukey test. Results: Higher proportions of correct readings were obtained with the conventional film (Kodak Insight) and CCD receptor compared with the PSP receptor used in this study (PSP < CCD <= Film; P < .001). Best results were obtained when examiners had access to all views. Most difficult locations in determining true diagnosis were the apical regions. Highest correct readings were obtained at the proximal cervical regions. Conclusion: Conventional intraoral film and CCD sensor produced similar results in diagnosing simulated external root resorption. Radiographic Interpretation of Experimental Lesions in Radicular Tooth Structure of Human Maxillary Anterior Teeth Joseph A. Bernier-Rodriguez, DDS, Stephanie J. Sidow, DDS, Anthony P. Joyce, DDS†, Kathleen McNally, DDS, James C. McPherson III, PhD‡ published online 27 October 2008. Abstract External resorption is often first detected radiographically. Early detection can lead to timely intervention and improvement of treatment outcome. The purpose of this study was to determine the minimal radicular defect size in maxillary anterior teeth that is radiographically detectable. Six teeth were selected in a cadaver maxilla (#6–11) and extracted. The teeth were then replanted in the maxilla, and three horizontally angled radiographs (0?, 30? from the mesial, and 30? from the distal) were exposed as a baseline. Then, a sequence of tooth removal, placement of a 0.1-mm deep defect in the interproximal and midroot surface, tooth replantation, and radiograph exposure was begun and repeated eight times. Each time the defect depth was increased by 0.1 mm. Ten clinicians interpreted the subsequent radiographs to determine if they visualized a defect on each tooth and the location of the defect. The evaluators' ability to detect experimental lesions according to the depth of the defect was shown to be statistically significant for both tooth type and location of the radicular defect (analysis of variance, p < 0.05). The average size of defect needed for radiographic visualization was as follows: central incisor (0.28 mm on the interproximal [IP] and 0.74 mm on the midroot [MR] [palatal], lateral incisor (0.39 mm on the IP and 0.55 mm on the MR); and canine [0.45 mm on the IP and 0.71 mm on the MR). Based on the results of this study, the minimal defect size detected was 0.28 mm to 0.74 mm depending on defect location and tooth selected. External resorption, radicular, radiograph, radiographic detection Key Words: