目的：观察根管治疗后的下颌磨牙冠缺损类型与冠根折的关系。
Objective: To evaluate the relationship between crown defect types and crown fractures of root-canal-treated mandibular molars.
目的观察牙冠延长术治疗断缘位于龈下的冠根联合折断牙的临床效果。
Objective:To observe the clinical effect of tooth extrusion with progressive methods for anterior teeth with crown-root fracture.
结论短期内冠根向预备技术比逐步后退技术成形的根管更有利于根管充填后根尖孔的密封。
Conclusion it is better apical sealing ability in root canals prepared by crown-down technique than step-back technique.
方法：通过观察4 7例冠根纵折的病例，对牙位、牙髓状态、牙髓治疗情况进行回顾性分析。
Methods: 47 cases were analyzed by respective study to analysis the cauese , clinical characters . diagnosis and prevention methods of vertical root fracture.
切根苗的高径比与冠根比均在壮苗的适宜范围内，须根数量多，菌根感染率高，均明显优于未切根的普通大田亩，这将有效地提高造林质量。
Ratio of height and diameter, crown and root, of root cutting seedling were strong with more fibrous root, and higher rate of fungus root infection than untreated normal field seedlings.
法国人想拔出那根因为没能在国王杯和欧冠半决赛与巴萨对战而刺于心头的刺。
The Frenchman wants to pull out the thorn of not playing the cup final or the semifinals of the Champions League against FC Barcelona.
方法对下颌后牙残根、残冠累及根分叉病变的24个患牙，采用分根法作保存修复。
Methods Separating roots was used for the conservative prosthetics of 24 mandibular posterior teeth with furcation involvement.
方法：对87颗残根残冠采用改良法进行根管取模，观察其临床效果，并进行分析、总结。
Methods: We took dental impression with this method for 87 residual roots or crowns, Clinical effect was analyzed and summarized.
目的：观察恒切牙外伤冠折后行一次性根管治疗与断冠再接术的临床效果。
Objective To investigate the clinical effect of one-time root canal therapy and reattachment of permanent incisors with crown fracture.
目的：探讨根管完全闭锁钙化残冠、残根的临床修复设计与方法，为修复临床对这类病例提供解决方案。
Objective: to explore the prosthetic design and procedure of residual crown with complete root canal imperforation so as to solve the clinical problem of such cases.
结论用铸造法制作桩冠桩核强度高，与根管壁密合，粘固手不易脱落与原烤瓷牙冠密合，不需要重新制作，节约了时间和费用，延长了烤瓷冠的使用寿命。
Conclusion This method could obtain the strength of crown dowel with root cavity without fall and cleft so that to save time and payment and prolong the use of ceramic teeth.
结果：本组病例各种类型冠折207例，根折23例。
Results: 207 cases were crown fractures, while 23 cases were root fractures.
目的：评价应用预成圆柱形根管钉对前牙牙体缺损患者冠再接后烤瓷修复体的临床效果。
Objective: To evaluate the clinical of using prefabricated cylindrical root canal pin to lengthen the clinical crown and restoring anterior tooth and premolar defect with PFM.
红门兰和美冠兰属东半球干燥兰花根磨制而成的一种食用淀粉，用作食品，以前作药材。
A starchy meal ground from the dried roots of various Old World orchids of the genera Orchis and Eulophia, used for food and formerly as medicine.
目的采用不平行就位道桩核烤瓷冠修复磨牙残根残冠多根管。
Objective To repair the residual roots and crowns of the molars with multi-canals using unparalleled posts and cores and ceramic crowns.
前牙残根残冠经过完善的根管治疗后，利用桩核冠修复在目前是主要的修复方法。
After perfect root canal therapy to the residual root and crown of the front tooth, it is the main repair method to utilize a post and core crown at present.
用游标卡尺分别测量牙长、冠长、根长、颈宽、颈厚、冠宽和冠厚；
The Tooth Length, Crown Length, Root Length, Cervix Width, Cervix Thickness, Crown Width and Crown Thickness were measured with a vernier caliper.
结论：在对根、冠髓细胞的原代培养中，组织块法优于组织块酶解法。
CONCLUSIONS: tissue explant method was superior to tissue explant-collagenase digestion method for the culturing of human dental coronal and root pulp cells.
方法分别制作两种桩核冠修复体比较其桩核折断、根管折断、桩松动脱落、颈缘等情况。
Methods:Two kinds of pile nuclear crown prosthesis were made and the break of pile nuclear and root canal, the fall off of the pile and cervical margin were compared.
方法选择磨牙的残根残冠，经完善的根管治疗后，采用分根法作保存修复。
Methods Separating roots was used for the conservative prosthetics of the molars residual roots and crowns which were selected. All these must be done after excellent root canal therapy.
理想全株型包括理想冠层构型和理想根构型。
The optimal plant shape includes optimal canopy structure and optimal root structure.
方法87例残根残冠经过完善的根管治疗后，用螺纹根管钉、光固化树脂核、金属烤瓷全冠进行修复。
Methods87 cases were treated with routine post-and-core PFM crowns after root canal therapy respectively.
“杰冠”公司坚持以“技术为根，质量为本”积极树立品牌形象，使“杰冠”成为知名品牌企业。
Jieguan insists "based on technology and quality" to establish brand image in order to be a renowned company.
但做完根管治疗的牙齿通常会慢慢变色，在前牙可能会影响美观，若病人在意的话，可做上金属瓷牙或全瓷冠。
But finished his teeth root canal therapy usually will gradually change color, front teeth may affect the appearance, if the patient care, can be done on metal ceramic tooth or all-ceramic crowns.
方法选择85例患者110颗患牙经过根管治疗，给予金属烤瓷冠修复，修复时在它的邻牙腭或舌侧设计金属翼以加强固位。结果经1～5年观察修复效果良好。
Method Because the metal roast porcelain hat is widely used in left root or top repairs, We cured 85 patients in 110 treatments by using root pipes.
又用荆棘编了一个茨冠，戴在他头上，拿一根芦苇放在他右手里；
Weaving a crown out of thorns, 17 they placed it on his head, and a reed in his right hand.
结果：根管钉植入有1颗断冠碎裂，1颗断冠脱落，1颗根管劈裂；
Results: Root canal nail was planted into 1 tooth precededs crackedly, 1 tooth precededs loose, 1 root crack;
结果无痛治疗（27.3%）、冠髓切断术（21.6%）、橡皮障的应用（1.4%）、氟化物的使用、咬合诱导等工作开展情况还有待加强。而根管治疗、窝沟封闭的应用情况比较好。
Results It is necessary to improve the use of analgesia ( 27.3% ), pulpotomy ( 21.6% ), rubber dam ( 1.4% ) and fluoride, the related work of occlusion guidance should be reinforced.
结果无痛治疗（27.3%）、冠髓切断术（21.6%）、橡皮障的应用（1.4%）、氟化物的使用、咬合诱导等工作开展情况还有待加强。而根管治疗、窝沟封闭的应用情况比较好。
Results It is necessary to improve the use of analgesia ( 27.3% ), pulpotomy ( 21.6% ), rubber dam ( 1.4% ) and fluoride, the related work of occlusion guidance should be reinforced.
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