1) Which is the initial bone ridge heigth required for this technique ?
For a good stability of the implant, the technique requires a bone ridge heigth of 4mm or more

2) Is it possible to use threaded implants with this technique?
You can use any shape of implants : after the lifting of the membrane with the grafting material, you just need to prepare the final site choosing between the final drill or the thread tap depending on the implant you want to insert.

3) Which grafting materials can we use ?
The best grafting material is the autogenous bone which, according to the availability, is mixed in different proportion with DFDBA ± 70%, and resorbable TCP ±30%, changing the proportion according to the available quantity of autogenous bone.

4) How big is the amount of grafting material that I should insert for the positioning of the implant ?
It's hard to answer because it strictly depends on the shape of the sinus : points of reference can be given only from intraoperative x-ray following the Rinn technique.

5) How long do we have to wait before loading the implants ?
As for all the implants inserted with any sinus lifting technique we have to follow the progressive loading technique. The exposure time of the implants is related to the initial heigth of the crestal bone : when it is 6-7mm or more, we can expose after 6-7 months, when it's less we must delay the exosure to about 10 months postoperatively.

6) How long after the surgery can the patient wear his old prosthesis again ?
After about 10 days, unless complications .It's important to unload the prosthesis on the fresh wound to avoid compression.

7) What is the correct prophilaxis after this surgery ?
Daily disinfection of the oral cavity and a broad spectrum antibiotic for 1 week.

8) Which is the advantage of the drills versus the osteotomes ? .
The technique is straight forward and atraumatic; and since the cortical bone is perforated and not fractured, the risk of accidental laceration of the membrane is prevented. Using the specific sequence of drills, the clinician slowly approaches the Schneiderian membrane. The shape of the drill tip prevents the perforation of the membrane.