Crestal Sinus Approach
K2 Crestal Sinus Lift Approach increase
the success rate in sinus lift. (Crestal Sinus approach)
The socket lift technique has an advantage of a minimally invasive operation compared with the lateral window technique.
However, patients suﬀer from beats by a mallet and there is a limitation to increase a vertical bone height. K2 Crestal Sinus
Approach was developed as a safer, and simpler, more minimally invasive technique with high success by Dr. Miyoshi andDr. Shiratori who are ones of experts in the ﬁeld of dental implant.

Minimal invasion can be achieved, compared with the lateral window technique.
There is no impact like beating by a mallet.
Due to reducing strain of the maxillary sinus membrane, the membrane damage
would be prevented and more higher sinus membrane lift could be achieved.

36-371 K2 Sinus instrument #1

Left：palatal
Right:mesial

36-372 K2 Sinus instrument #2

Left：mesial
Right:palatal

36-373 K2 Sinus instrument #3

Left：buccal
Right:distal

Left：distal
Right:buccal

New technique of sinus lift

（Photo by Shiratori Dental Clinic Implant Center）I think everyone feels “An implant treatment in the maxillary molar region is diﬃcult”
because of limited bone quantity due to the presence of maxillary sinus cavity andpoor bone quality. Even though high success rate of the sinus lift can beexpected, once complication, such as infection, occurs, not only thepatient, but the clinician will be aﬀected too. Furthermore, it has
been observed that, sometimes, bone around the implant apex
has resorbed a few years later, resulting in the appearance of
implant protruding into the maxillary sinus cavity. Thistechnique was introduced to ensure a “predictable andsafe” sinus lift procedure. (Dr. Shiratori)

New minimally invasive technique of Sinus lift

（Photo by Miyoshi Dental Clinic）

The lateral window technique is generally selected for the sinus lift, however, stress ofpatients after the surgery such as a pain, swelling and infection is severe. I thought thecrestal sinus approach technique could reduce the risk of invasion. However,ver,there was no suitable instrument for the technique at that time. Therefore,,
I created this with Dr. Shiratori. This instrument can be approached throughgh
the implant osteotomy to elevate the maxillary sinus and place an implanttwith a minimally invasive technique. In addition, the ﬂapless surgery could
be operated with this technique in some cases, this would be a big
advantage for the patients. (Dr. Miyoshi)

K2 Crestal Sinus Approach

1〜2mm

OT5

Driling-1

Drilling-2

Detachment-1

Perform the osteotomy
at 1-2mm below themaxillary sinus ﬂoor.

Perforate the sinus ﬂoor by K2 drill in accordancewith the diameter of the implant.
*In case the maxillary sinus ﬂoor is not ﬂat, Piezosurgery is helpful.

Detach the schneiderian membrane aroundthe aperture using the tip of the K2 instrument#1 hanging on the sinus ﬂoor.

Detachment-2

Detachment-3

Measuring (checking)

Implant Placement

Push up the head of
the K2 instrument #1
toward to all direction
in sinus.

Detach the sinus membrane higher using the tip ofthe K2 instrument #2 or #3 along the sinus cavity.
Each end of #2 and 3 faces a diﬀerent direction,
therefore, all directions could be covered using both
#2 and 3 as the right ﬁgure showing.

Measure and check theelevated height using
the K2 instrument #1.

Fill the bone graft if
needed, and insert
the implant.