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Anterior teeth vulnerable to the impact of external forces and crown fracture occurs, The crown fracture repair in addition to composite resin directly repair, and porcelain crown, veneer repair broken crown followed by its beautiful appearance, easy to operate, inexpensive attention. Interrupt crown followed by repair crown fracture repair compared to how intensity strength binder followed after how retention form and other clinicians are more concerned about the problem of direct composite resin. This study around the question, is divided into three parts: (1) First, a review of the last 20 years (1989 to 2008) the relevant literature broken crown followed; (2) followed by a series of in vitro studies, including the establishment of former crown fracture model, comparing a broken crown draw a line and the shear strength of the composite resin directly repair compared two binders, three retention form off crown were followed by strength; (3) The last preliminary observation followed the clinical efficacy of the front teeth broken crown. The first part of the front teeth off the crown were followed by 20 years (1989 to 2008) literature review of the materials and methods in accordance with the search strategy and inclusion exclude the the standard retrieval in English Indexed front teeth broken crown followed by the last 20 years (1989 to Document 2008). Two evaluators carefully read the full text quality evaluation according to the standards recommended by the Committee of Medical Journal Editors, and cross-checked disagreement with relevant expertise professor re-evaluation decision. Results A total of 90 of the English literature, Chinese literature 82, nearly 20 years showed a rising trend; evaluation of which 153 clinical class literature demonstrate strength, results: the argumentation strength V, IV, Ⅲ, the Ⅱ level I literature 71, 77, 4, 1, 0. Conclusion nearly 20 years (1989-2008) came off the crown were followed by more and more attention, but less quality clinical class literature. The second part of the front teeth broken in vitro studies of the effect of crown followed a crown fracture model material and methods complete vitro maxillary central incisors 60 self-curing resin-embedded, exposed crown cut 1/3; specimens fixed on a universal testing machine, the shovel-shaped tool, perpendicular to the lip surface of a tooth, the role of the embedding at sustained load to the speed of 1mm/min, and to break. The recorded fracture when the shear force; observed crown broken, broken 2 as a model to create the \Maxillary central incisors cut 1/3 of the range of shear force from 623.1N to 1184N, an average of 855.94 ± 147.43N; 60 samples, 43 (71.67%) successfully completed crown fracture model. Conclusion We have successfully established a crown fracture model. 2 off the crown were followed by the effect of repair and composite resin directly compare the Materials and Methods homemade the cut crown fracture in the human maxillary model 36, were randomly divided into two groups, group A followed by repair broken crown group B the direct repair of composite resin ; 24h after the labial surface of the sample placed in the load stage, universal testing machine Spade tool perpendicular to the tooth, the role of the crown fracture line at a maximum load of 10 kN load speed of 1 mm / min until broken . The results after the repair of the two sets of shear force were: (326.78 ± 70.66) N, (351.74 ± 54.11) N, no statistically significant difference (t = 1.190, P = 0.242). Conclusions crown fracture, broken crown followed after strength not less than direct repair of composite resin. 3 binders for broken crown followed the effect of materials and methods homemade Hang maxillary to cut crown fracture model 40. Randomly divided into two groups, group A followed by B group with one step of the CTB and the same binder resin AP-X followed by a two-step method of binder CSE and composite resin AP-X; 24h and placed The universal testing machine loading table, shovel-shaped lip of the tool perpendicular to the tooth surface, acting on the crown at the fracture line, the maximum load of 10 kN, the speed of 1 mm / min loading, until broken. A, B group followed the shear force, respectively (324.32 ± 65.91) N, (263.08 ± 55.88) N group A was significantly stronger than group B, the two groups have a statistically significant difference (t = 3.17, P = 0.003). The different conclusions binder off the strength of the crown were followed, the cola a two-step method Li Fei Lu binder followed after the intensity higher than the one-step binder. 4 retention form off crown were followed by the impact of the materials and methods of homemade the constant cut crown fracture in the maxillary model 40, were randomly divided into four groups. A control group, the B group bevel, C group dentin intraparietal D group overcontour. Samples followed by 24h after the tool perpendicular to the labial surface of the tooth placed in the universal testing machine loading table, spade, acting on the crown at the fracture line, the maximum load of 10 kN, the speed of 1 mm / min loading until broken. The results of the shear force in the group followed were: (211.31 ± 59.30) N, (300.29 ± 89.81) N, (349.24 ± 86.84) N, (327.03 ± 85.85) N, a statistically significant difference (F = 5.528, P = 0.003). Twenty-two compare B, C, D groups were followed by shear force is greater than the A group, a statistically significant difference (P lt; 0.05); B, C, D group followed the shear force is no obvious differences (P gt; 0.05). Conclusion The preparation the retention form can enhance strength followed after. Materials and methods of clinical studies of the third part of the front teeth broken crown followed traumatic crown fracture of maxillary central incisors 11, proper dental pulp processing, prepare the appropriate retention form, using the two-step method binder the CSE and resin AP off crown-X followed. Respectively, in the immediate postoperative, 3 months, 6 months investigating the patient (or guardian), and physician satisfaction. Results After treatment, the patients or patient guardians Instant Rating: 10 patients were \Three months later: satisfied, more satisfied, not satisfied with the number of patients who were 8, 1 patients. After 6 months: satisfied, more satisfied with the number of dissatisfied patients were 7,2,0. Immediate evaluation of treatment after doctors: 11 teeth satisfied, more satisfied, not satisfied with the number of teeth were 10,1,0. After 3 months: satisfied, more satisfied, not satisfied with the number of teeth were 9,1,1. After 6 months: satisfied, more satisfied, not satisfied with the number of teeth were 8,2,0. The conclusion by the six-month review, only one patient is \
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