Improve the control effect of bollworm, and rational selection of drugs is the key. Among the pyrethroid pesticides, enemy-killed, cypermethrin, beta-cypermethrin, and kung fu are effective in controlling cotton bollworms, and are mainly used to control three generations of bollworms. However, cotton aphid production on the production of this type of pesticide has a high degree of resistance, almost no effect to control cotton aphid. When the cotton aphid and the cotton bollworm are mixed together, pyrethroid pesticides are generally not used. Among organophosphorous pesticides, phoxim had a good effect on controlling bollworm, but phoxim was easily decomposed with light, and the efficacy period was short. The number of medications should be increased when used. Monocrotophos has a wide insecticidal spectrum and has control effects on bollworm, cotton aphid, and spider mites, but the effect is general. It is difficult to control the harm with monocrotophos alone when the bollworm occurs, and it should be mixed with other medicaments. Among carbamate pesticides, methomyl (Wan Ling) is effective in preventing and controlling cotton bollworms and can kill young larvae and eggs. Among the compounding agents, cotton bollworm, de-lingling, Xinguang No. 1 had a prominent effect on the control of cotton bollworm. In biological pesticides, Bt preparations prevent and control bollworm, which can be sprayed during the hatching period, 2 to 3 days ahead of spraying chemical pesticides, and have a higher control effect on newly hatched larvae. In addition, investigation of insect pests, timely spraying of pesticides, improvement of spraying methods, and improvement of control quality; alternating use of pesticides, delaying the production of pest resistance, etc., are also key measures for the prevention and control of cotton bollworm. The chair side CAD / CAM repair system has obvious advantages in aesthetic effect, operation time, patient participation and operation convenience. Discussion: traditional repair method: after the model is transferred, it will be sent to the technician's room for processing and making the final prosthesis. About one week, the final prosthesis will be tried on, grinded and bonded. The prosthesis was made in the technician's room. The patients need to accept the aesthetic effect of the prosthesis passively without any sense of participation. The implant repair method of chair side CAD / CAM system: obtain computer three-dimensional model by blue light scanning method, design and make personalized abutment and all ceramic restoration on computer, dye, glaze and bond after trial wearing, the whole restoration is made by chair side, patients can directly participate in the restoration design, and feel more involved. Conclusion: in the implant area of the anterior teeth, compared with the traditional implant repair method, the chair side repair system can get more satisfactory results, which is worthy of clinical application and promotion. Desktop Type Dental Milling Machine Dental Equipment For Lab,Dental Implant Milling Machine,Titanium Dental Milling Machine,Glass Ceramic Dental Milling Machine Shandong Carved Intelligent Technology Group Co.,Ltd , https://www.demetdent.com