CMI Definition
C Fixation
Fixation condition where fixation is achieved in the coronal 1/3 of the implant.
M Fixation
A fixation sate in which fixation is achieved in the middle 1/3 of the implant.
I Fixation
A fixation state in which fixation is achieved at the apex 1/3 of the implant.
C Fixation
Fixation condition where fixation is achieved in the coronal 1/3 of the implant.
M Fixation
A fixation sate in which fixation is achieved in the middle 1/3 of the implant.
I Fixation
A fixation state in which fixation is achieved at the apex 1/3 of the implant.
Detailed description
•The “I” in I-Fixation should originally be Apical, but it is represented by the “I” in Inferior instead of “A” to represent cases where fixation is obtained from the Inferior wall of the maxillary sinus.
•The surgical protocol and implantation concept involve dividing the bone at the implant site into three parts—coronal, middle, and inferior—to achieve optimal initial fixation strength in each part.
•The location where the implant is installed in the alveolar bone is divided into three parts: coronal, middle, and apical (inferior) by comparing it to the tooth structure, and the implantation concept is to obtain a stable fixation value according to the bone quality of each part.
•Tapping in Cortical Bone / Compaction in Cancellous Bone (Hard Bone is Passive Placement / Soft Bone is Active Placement)
•The surgical protocol and implantation concept involve dividing the bone at the implant site into three parts—coronal, middle, and inferior—to achieve optimal initial fixation strength in each part.
•The location where the implant is installed in the alveolar bone is divided into three parts: coronal, middle, and apical (inferior) by comparing it to the tooth structure, and the implantation concept is to obtain a stable fixation value according to the bone quality of each part.
•Tapping in Cortical Bone / Compaction in Cancellous Bone (Hard Bone is Passive Placement / Soft Bone is Active Placement)
D1
D2
D3
D4
•The bone quality of each part of CMI (vertical position where the implant is placed) is divided into 4 types, D1 to D4.
Sinus CMI Fixation
Class I
CMI fixation in the posterior maxilla without engaging the inferior cortical wall of the sinus.
Class II
CMI fixation in the posterior maxilla with engagement of the implant apex into the inferior cortical wall of the sinus without bone grafting into the sinus.
Class III
CM or C fixation in the posterior maxilla with sinus elevation and bone graft through a crestal approach.
Class IV
CM or C fixation in the posterior maxilla with sinus elevation and bone graft through a lateral approach.
Class I
CMI fixation in the posterior maxilla without engaging the inferior cortical wall of the sinus.
Class II
CMI fixation in the posterior maxilla with engagement of the implant apex into the inferior cortical wall of the sinus without bone grafting into the sinus.
Class III
CM or C fixation in the posterior maxilla with sinus elevation and bone graft through a crestal approach.
Class IV
CM or C fixation in the posterior maxilla with sinus elevation and bone graft through a lateral approach.
CMI Fixation Indication
CM Fixation
When CM areas of an implant make contact with the residual bone, while the I area remains uncontacted, it is referred to as a ‘CM fixation’.
C Fixation
It is referred as a ‘C fixation’ when less than 3to 4mm of the residual bone remains in the posterior maxilla. It is also considered as a C fixation if the MI area in the posterior mandible consists almost entirely of hollow cancellous bone due to severe osteoporosity(D5), with cortical bone present only in the crestal area. It is also an example of C fixation if implant fixation is achieved only in the C area due to the presence of severe labial concavity in the maxillary anterior area.
MI Fixation
In cases of bone defects in the crestal area or immediate implant placement in an extraction socket, achieving C fixation can be challenging. When a sufficient level of fixation is attained in the MI area, it is referred to as an ‘MI fixation.
I Fixation
When implant fixation is achieved solely in the apical area, it is referred to as ‘I fixation.’ This is commonly observed in cases of immediate implant placement in an extraction socket or in the presence of a severe vertical bone defect.
