 Hello everyone, welcome back to another session in dentistry and more. So we're continuing our operating instrument sessions. So today we have four-handed dentistry or close supported dentistry. It is a approach where the fatigue of the operator or dentist will be so much less when he has or she has an assistant. So when aspirating the dental nurse should place the aspirator in the mouth before the dentist position the mirror and handpiece. So always we have an assistant, he can do the half of the work. So she first retracts the lips with a finger or the tip of the three-in-one syringe and then places the aspirator tip in position. So it helps the operator or dentist to perform well. He has a better visibility, a good access and he has no worry about the moisture because the assistant is taking care of all the moisture and soft tissues. So the dentist can perform well. So his fatigue is less, the efficiency is more. So if this order is reversed, the dentist view is likely to be abstract. So the tip of the aspirator should never contact the patient's soft palate as this might cause itching. So the orifice of this aspirator tip may be positioned either on site or behind the last tooth. In either position, the aspirator tip also retracts the soft tissue. So when on site is placed next to the tooth being prepared, level with its occlusion plane on the side of the arch nearest to the dental nurse. So this bevel of the aspirator tip should be parallel to the arch and about one centimeter away from the tooth so that the coolant spray is not diverted away from the tooth. And alternatively, the aspirator tip can be placed in a rupture molar area that is just distilled to the last molar which is where water will naturally collect with the patient supine position. So the first thing is we need to educate the dental nurse or auxiliary properly where to keep the suction tip, how to keep it and what all. Whenever she should adjust according to the patient's position and all those things will definitely improve the dentist performance. So the dental nurse also assesses with soft tissue retraction in other ways mainly with the tissues on her side of the arch. Thus when working on the left side of the mouth, the cheek and lips on the patient's left side are the responsibility of the dental nurse while tongue retraction is the responsibility of the dentist. And conversely when working on the right side tongue and tongue retraction is the responsibility of the dental nurse while the dentist retracts the lips and cheeks. When cutting with air turbine the mirror surface quickly becomes obscured by so the dental nurse should keep the mirror clear by washing it with spray and blowing air over to it. Simultaneously she should do it so each time the cutting stops the dental nurse should wash and dry the cavity and the mirror so that the dentist can see clearly. So moisture control is basically we can run using cotton rolls, rubber dams or celeber ejectors. Celeber ejectors are various types and sometimes we have the metal types and this is plastic types. The metal celeber ejector on the left side has flans to retract and protect the tongue and this is a kind of disposable one. So that was all about the close supported dentistry or four-handed dentistry where the role of auxiliary or dental nurses very crucial. So that was all about this session. I will come up with the instrument sharpening in my next session. Thank you.