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Indirect Sinus Lift

A sinus lift procedure is essentially done to increase bone height and density in the posterior maxilla. Also known as subantral augmentation, the procedure is extremely effective in increasing bone height using the following techniques:


  • The lateral window technique the direct sinus lift procedure or lateral approach
  • The one step antrostomy technique
  • The osteotome sinus floor elevation technique or crestal approach which is also called the indirect sinus lift procedure

Considered as one of the best treatment modalities, the implant dentistry can be jeopardized due to insufficient bone quantity with pneutamization of the sinus and resorption of the ridge. The obvious choice would restore such an anatomic deficiency by lifting up the floor of the sinus.

Features and advantages of the indirect sinus lift procedure:

  • The procedure is performed on the sites that have < 5mm between the floor of the maxillary sinus and crest of the bone
  • Procedure is performed with simultaneous implant placement
  • Vertical height of the bone is enough to stabilize the implant
  • Indirect sinus lift procedure is less invasive than direct sinus lift
  • Damage to the sinus is minimal without affecting the sinus pressure



Dr. Sudhakar Reddy thoroughly pre-evaluates the implant site with detailed radiographic examinations. The hard and soft tissues are fully inspected and diagnostic information collected before the surgery.

  • Gingival health is assessed: texture, colour, bleeding and depth of the pocket are examined
  • Ridge mapping technique requires evaluation of the bone topography to enable ridge mapping
  • Measurements are carried out for:
  • alveolar height to sinus floor
  • mesio-distal and bucco-lingual width of the edentulous space using IOPA (intra-oral peri-apical), CT dentascans and OPG (orthopantamogram)
  • The infraorbital nerve, the posterior superior alveolar nerve and greater palatine nerve blocks are administered with sensorcaine. Local infiltration may be done with 2% lignocaine HCL
  • 2 -3 mm incision is made on the palatal side of the ridge crest
  • Full-thickness mucoperiosteal flap is reflected and retracted
  • Surgical stent is inserted into the site
  • Implant position is marked with a round bur
  • Pilot drill is used to prepare implant bed (1-2 mm short of sinus floor)
  • The sinus floor is broken with an osteotome
  • The bone mobilized at the sinus floor is raised with the osteotome
  • The implant is inserted at the site prepared for it
  • Titanium cover screw is inserted on the implant
  • The mucoperisosteal flap is repositioned and sutured


Where a bone graft may be done blindly, the indirect sinus augmentation procedure requires skill, precision and experience and Dr. Sudhakar Reddy is one of the few doctors who possesses excellent knowledge and is technically skilled to perform the procedure.


                        Authored By DR. SUDHAKARA REDDY - Implantologist, Bangalore 



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