NiTi 片段弓联合2×4矫治器治疗替牙期上切牙重度扭转

介绍一种矫治上颌中切牙重度扭转的方法。先应用 NiTi 片段弓减轻重度扭转的上颌中切牙,再用2×4矫治技术进一步矫治扭转。矫治效果良好,临床使用方便。     

三联别针簧临床应用体会

三联别针簧是一种半固定矫治器,用于纠正上颌中切牙扭转。我们在临床应用中取得了满意疗效,认为这是一种纠正混合牙列早期前牙扭转和防止拥挤发生的理想矫治器,现将体会介绍如下;１临床资料 男性２３例,女性１９例,共４２例。年龄８．５～１４岁。两侧上颌中切牙同时扭转者１６例,单侧上颌中切牙扭转者２１例,１扭转,１反　者１例,中切牙和一个侧切牙同时扭转者４例。２结果 应用三联别针簧后,每周复诊加力调整一次。经矫治５周扭转纠正者１３例,７～１０周扭转纠正者１８例,１１～１６周扭转纠正者１１例,其中１例扭转约８０…     

上颌中切牙间四个多生牙1例报告

多生牙好发于上颌前牙区 ,多呈圆锥状 ,单个或 2个以上颌两中切牙之间或唇腭侧萌出较多见。笔者遇到 1例四颗多生牙 ,两颗埋伏两颗对称分布在上颌中切牙之间的病例 ,现报告如下。患者 ,男性 ,10岁。因上颌中切牙间多生两颗畸形牙齿来我院求治。专科检查 :颌面部发育正常 ,上颌两中切牙间有两颗多生牙 ,牙冠较大近似中切牙 ,舌侧有一多生牙尖 ,近中轻度扭转 ,之间有 2ｍｍ间隙。 11在 2 2的远中 3 3的位置萌出 ,1外翻扭转 4 5°,1外翻扭转 3 0°。 2 2 在中切牙近中腭侧萌出 ,与两颗萌出的多生牙重叠 ,ⅢⅡⅠⅠⅡⅢ 已脱落 ,3 3未萌出 ,局部…     

上颌中切牙间两多生牙对称分布1例

多生牙好发于上颌前牙区，多呈圆锥状，单个从上颌两中切牙之间或唇胯侧萌出，笔者遇到一例两颗多生牙对称分布在上颌两中切牙之间的病例，现报告如下。患者，女性，9岁，因上颌中切牙间多生两颗圆锥状牙齿来我院求治。专科检查：颌面部发育正常，已萌出，但稍扭转，之间有两颗圆锥状的多生牙对称分布在中线两侧，已脱落，未萌出．X线片示根管粗大，很尖孔呈喇叭状，两多生牙发育完好，根细长，稍弯曲，根管清晰通畅，很尖孔闭锁。拔除两多生牙5个月后复查，见两中切牙之间的间隙逐渐缩小，的扭转亦得到纠正。上颌中切牙间两多生牙对称分布…     

牙齿扭转畸形的调查及原因分析

本资料对602例原始记存模型的观察测量,发现有大于15°牙齿扭转的患者369例,占总调查人数的61.3％,共查出大于15°扭转牙783枚,其中上颌440枚,下颌343枚。90°严重扭转的牙齿共26枚,其中上颌16枚,而下颌为10枚。52例发生中切牙外翻,上颌40例,下颌为12例,远比上颌少。调查统计表明,在上颌扭转牙的好发部位是中切牙区和前磨牙区,而在下颌第二前磨牙区的扭转错位发病率最高,其次是下颌的切牙区。可以看出在上下颌牙齿扭转错位的发生率是有差别的。本文分析和研究了产生牙齿扭转错位的主要原因。尤其注意到拥挤与牙位扭转畸形有着非常密切的关系。     

上颌中切牙扭转90°的早期矫治

作者介绍了一种矫治上颌中切牙扭转90°的活动矫治器,对矫治适应症与注意事项进行了讨论。强调替牙早期矫治,可利用牙弓的天然间隙,缩短疗程,并能阻断牙扭转造成的错(牙合)畸形。     

正畸患者对女性上颌中切牙和侧切牙牙龈高度不对称的审美评价

目的：调查正畸患者对女性上颌中切牙和侧切牙牙龈高度变化的关注程度和审美评价。方法建立女性上颌中切牙和侧切牙牙龈向切端偏移的模型（上颌中切牙和侧切牙牙龈向切端偏移0.5 mm、1.0 mm、1.5 mm和2 mm）,利用调查问卷对正畸患者进行调查。结果上颌中切牙和侧切牙左右牙龈对称和上颌中切牙牙龈向切端偏移0.5 mm时,是患者认为最美观的笑容;上颌中切牙和侧切牙牙龈向切端偏移1.0 mm时,患者开始察觉上颌中切牙和侧切牙牙龈不对称（P<0.05）;上颌中切牙和侧切牙牙龈向切端偏移1.5 mm到2.0 mm时,患者认为已经影响了美观和笑容（P<0.05）。结论上颌中切牙和侧切牙牙龈不对称的牙龈高度变化1.0 mm到1.5 mm以上时,患者开始察觉和开始认为影响了美观和笑容。     

正畸力对上中切牙牙根继续发育影响的初步研究

目的 研究正畸力对未发育完全的上颌中切牙牙根继续发育的影响.方法 选择替牙期牙根未闭合的上颌中切牙16颗,唇向开展上前牙矫治反(牙合).选择恒牙期牙根闭合的上颌中切牙16颗,采用镍钛丝排齐整平的方式进行不拔牙正畸治疗.患者在一年后结束治疗,治疗前后拍摄CBCT,进行Mimics15.0重建分析上颌中切牙的牙根长度和体积变化.结果 治疗后替牙期患者的上颌中切牙的牙根长度和体积得到增加(P＜0.05).恒牙期患者的上颌中切牙的长度减少(P＜0.05),体积无明显变化(P＞0.05).结论 未发育完全的中切牙的牙根可以继续正常发育.     

上颌中切牙的唇面形态观察及修复塑形的建议

上颌中切牙在口腔中的位置决定了其在牙科美容中的重要地位,这表现在两个方面:在各种意外事故中上颌中切牙是最易受伤害的;在整个牙列中上颌中切牙是最引人注目的.因此,在做牙体修复时理应对上颌中切牙加以特别的关注.笔者对上颌中切牙的唇面形态进行了观察,以冀为修复时的表面塑形提供可循的原则.材料与方法对一百余例完好的中切牙的唇面形态进行观察并记录以下两个特征见附图:     

58例自体牙齿再植术成败原因分析

1993～1996年4年间作者共进行牙再植术86例,现随访到58例72个牙齿,报告如下:1　临床资料随访到的58例患者,年龄9～51岁,男39例,女19例,35岁以下者47例,占81.3%。下颌牙24个,上颌牙48个。下颌中切牙9个,上颌中切牙15个;下颌侧切牙7个,上颌侧切牙13个;上颌尖牙11个,下颌前磨牙4个,上颌前磨牙8个;下颌磨牙4个,上颌磨牙1个。　　外伤脱位53个:其中中切牙20个,侧切牙16个,尖牙8个;前磨牙9个。错位阻生5个:其中尖牙2个,前磨牙3个。扭转畸形9个:其中中切牙4个,侧切牙4个,尖牙1个。慢性尖周炎2牙均为磨牙。智齿拔除致邻牙脱位3个,均为磨牙。2　操作…     

Orthodontic treatment for an unerupted and severely rotated maxillary central incisor. A case report.

BACKGROUND: Many reports have indicated the treatment for permanent teeth with disturbed eruption due to the presence of supernumerary teeth. However, successful treatment for an unerupted maxillary incisor with severe rotation and another maxillary incisor with disturbed eruption by a supernumerary tooth is quite rare. CASE REPORT: We treated a 7-year-old Japanese male with an unerupted and severely rotated maxillary right incisor, along with a maxillary left incisor due to interference with eruption by an inverted supernumerary tooth. Orthodontic treatment using surgical exposure, traction and guidance of the rotated right incisor, and maxillary expansion following extraction of the supernumerary tooth were performed. FOLLOW-UP: At 27 months following extraction of the supernumerary tooth, and comprehensive orthodontic treatment led the malposititioned central incisors to a functional position and stable occlusion.     

Orthodontic treatment of fused and geminated central incisors: a case report

A 10-year old Egyptian male presented with a geminated upper right central incisor along with a fused and rotated upper left central incisor in cross bite. He also had severe crowding in the maxillary arch and a congenitally missing lower right first permanent premolar. Orthodontic treatment was carried out to align upper right and left central incisors, lateral incisors, and canines. Treatment options were discussed.     

Treatment of an impacted dilacerated maxillary central incisor.

Impacted Incisor With Dilaceration refers to a dental deformity characterized by an angulation between crown and root causing noneruption of the incisor. Surgical extraction used to be the first choice in treating the severely dilacerated incisor. In this article, a horizontally impacted and dilacerated maxillary central incisor was diagnosed radiographically. By combining two stages of the crown exposure surgery with light force orthodontic traction, the impacted dilacerated incisor was successfully moved into proper position. However, long-term monitoring of the stability and periodontal health is critical after orthodontic traction.     

Malformation and delayed eruption of maxillary incisors caused by a warty tooth

A 7-year-old boy presented a delayed eruption of the maxillary left central incisor. Upon investigation the maxillary left central incisor was found to be fused, to an irregular and complicated mass that resembled a complex odontoma. The left central incisor and odontoma-like structure were extracted together as a single mass to prevent the risk of displacement and eruption disturbance of the maxillary left lateral incisor and canine. After enucleation of the malformed maxillary left central incisor, the mesially inclined maxillary left lateral incisor was restored with composite resin temporarily to resemble the morphology of the maxillary left central incisor and the canine was allowed to erupt naturally, resulting in esthetically aligned anterior teeth.     

AP relationship of the maxillary central incisors to the forehead in adult white females

OBJECTIVE: To evaluate and compare the anteroposterior relationship of the maxillary central incisors to the forehead in adult white females with harmonious profiles and in adult white female orthodontic patients. MATERIALS AND METHODS: Ninety-four photographic images of adult white females with good facial harmony (control sample) were compared with 94 photographs of adult white females seeking orthodontic treatment (study sample). All images were of the face in profile with the maxillary central incisors and the forehead in full view. The images were scanned, resized, and rotated to the upright head position. Reference lines were constructed to assess the anteroposterior positions of the maxillary central incisors as well as forehead inclinations. RESULTS: In the control sample, 93% had maxillary central incisors positioned between the FFA point and glabella, 4% posterior to the FFA point, and 3% anterior to glabella. The positions of the maxillary central incisors were strongly correlated with forehead inclination (r2 = .642). In the study sample, 21% had maxillary central incisors positioned between the FFA point and glabella, 64% posterior to the FFA point, and 15% anterior to glabella. The positions of the maxillary central incisors were poorly correlated with forehead inclination (r2 = .094). The difference between the means for anteroposterior maxillary incisor position was statistically significant (P = .0001). CONCLUSION: The forehead is an important landmark for anteroposterior maxillary incisor positioning for adult white female patients seeking improved facial harmony.     

Esthetic improvement in the patient with one missing maxillary central incisor restored with porcelain laminate veneers

This article describes esthetic improvement in a patient with a missing maxillary left central incisor. Space analysis of the anterior dentition showed that minor tooth rearrangement was needed. Optimal space distribution for restorations was attained by orthodontic treatment. Through transforming tooth shape with porcelain laminate veneers, the maxillary left lateral incisor was transformed into central incisor and the maxillary left canine into a lateral incisor. The maxillary right central incisor was also restored for esthetic improvement. In a case of changing a tooth shape with porcelain laminate veneers, pre-treatment evaluation, space analysis and diagnostic wax-up are important factors.     

Determination of approximate size of maxillary anterior denture teeth when mandibular anterior teeth are present. Part III: Relationship of maxillary to mandibular central incisor widths

The average width of a natural maxillary central incisor is 8.92 mm. This value is determined from the results of three studies of natural dentitions. The average width of a mandibular central incisor is 5.5 mm. The average ratio produced by dividing the average maxillary central incisor width by the average mandibular incisor width is 1.62. The factor of 1.5 times the width of a mandibular central incisor produces a maxillary central incisor width that is too narrow. The width of a mandibular central incisor plus half the width of the mandibular lateral incisor also produces a maxillary central incisor width that is too narrow. There may be a tendency to undersize the maxillary prosthetic dentition. The ratio of 1.62 can be used to select the appropriate width for a missing maxillary central incisor when given the width of the mandibular central incisor. This ratio of 1.62 is also valuable to verify the dimension of a selected artificial maxillary central incisor when the patient complains that the tooth is too large. If substitutions or adjustments are made in the mold, the desired canine-to-canine measurement produced by the ratio range of 1.3 to 1.38 reported in Parts I and II of this study should be maintained.     

Trauma-induced dentigerous cyst involving the anterior maxilla

The dentigerous cyst is the most common developmental odontogenic cyst of the jaws. The purpose of this article was to report the case of a dentigerous cyst associated with a permanent maxillary central incisor in a 5-year-old boy who had suffered severe facial trauma at age 4. Panoramic and periapical radiographs revealed a well-defined radiolucent area with radiopaque borders surrounding the permanent maxillary left central incisor, causing displacement of the tooth buds of the permanent maxillary left lateral incisor and canine and root resorption of the deciduous maxillary left lateral incisor. Treatment was performed by aspiration and enucleation; the permanent maxillary left central incisor was part of the cyst and, thus, was also removed.     

Management of root dilaceration of an impacted maxillary central incisor following orthodontic treatment: an unusual therapeutic outcome

Abstract – There are rare cases of impacted permanent central incisors with dilaceration, a dental deformity characterized by pronounced angulation of the longitudinal tooth axis. This paper presents the orthodontic alignment of a permanent maxillary left central incisor in a 7.5‐year‐old boy, which appeared impacted radiologically and displayed root dilaceration. Following surgical exposure with the closed‐eruption technique and appropriate orthodontic traction, the tooth was successfully aligned into the dental arch and the root was radiologically shown to be straightened and relatively well developed.     

Multidisciplinary evaluation and clinical management of mesiodens

Supernumerary teeth are a disorder of odontogenesis relatively common in the oral cavity and characterized by an excess number of teeth. The term mesiodens is used to refer to an unerupted supernumerary tooth in the central region of the premaxilla between the two central incisors. The complications associated with mesiodens include: lack of eruption of permanent teeth, the deviation of the eruption path, rotations, retention, root re-absorption and pulp necrosis with loss of vitality, and diastema. Early detection of mesiodens is most important if such complications are to be avoided. This report describes the treatment of a maxillary central incisor impacted by a mesiodens. The case initially required only surgical treatment, to remove the supernumerary tooth. Successively, orthodontic therapy was done to bring into position the left permanent central incisor, which erupted physiologically, but rotated 90 degrees around along its long axis.