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MICROIMPLANT  CHOICE

Several sizes of Absoanchor microimplants are available for different tasks and sites. No.12cylinder (1.2mm diameter), NO.13 cylinder (1.3mm in diameter) and No. 13 tapered (1.3mm in dismeter) can all withstand up
to 450g of orthodontic force. (有不同大小的骨釘可以供臨床使用,依據其承載力與位置),最大可以達450g的矯正力 

However most of the forces needed will measure less than 300g , clinicians should select  No.14( 1.4mm in diameter), 15( 1.5mm in diameter), or 16( 1.6mm diameter) cylinder or tapered. When there is no initial tightness with Nos.12 and 13 microimplants, clinicans should select the next larger sizes until there is a close fit between screw and bone.

(若是小於300g的力值時,使用上述的型號會較好)

 We have found that the tapered types of microimplants offer more tighness initially, wheres cylinder types give more retention in the latter stages of their use.(有一點傾斜的骨釘其固持效果會較好一點)

Ordinarily, the first choice of Absoanchor microimplant should be either a No. 12 or 13 cylinder or tapered.
Nos. 17 and 18 tapered types are designed for intermaxillary fixtion during orthognathic surgery.

In the mandible, the buccal surfaces and retroimolar areas offer adequate thickness and high quality cortex
for the acceptance of microimplants (Fig. 12). Usually, those of 4 -5mm in lenght with 1.2 -1.3mm in diameter improve adequate retention.  

A microimplant with 1.4 -1.6mm might improve retention when cortical bone is less dense or greater force is needed; e.g.,when moving the entire mandibular dentition distally. From time to time mandibular lingual microimpants are needed, and tori offer excellent implant sites. 

The cortical surfaces of the maxilla are thinner and less compact then those of the mandible and require longer
microimplants; e.g., 6 -8mm with 1.2 -1.3mm diameter. A general rule of thumb advises one to use the longest
microimplant  possible without jeopardizing the health of adjacent tissues. The proper lenght microimplant is best selected during the pilot drilling. 

On the palatal surface, the mucosal thickness is measured with the anesthetic needle, and then a microimplant chosen that will place at least 6mm of metal in to the bone. when placing microimplants in the palate, always review the positions of the greater palatine artery(注意這一條血管) and nerve so as to avoid them. Excellent impalnt sites in the
maxilla are below the anterior nasal spine and the midline of the palate.

These areas contain very good quality of cortical bone. However they contain osseous sutures. so when we place the
microimplant in to the suture area is not enough, we can place the microimplant just adjacent to suture.(不要把骨釘打入suture內,retention不好) 

Whenever a microimplant impinges on movable soft-tissue rather than attached gingiva, it is often preferable to
use anon-button type microscrew and place it completely under the gingiva with an emerging wire hook made from a
ligature for the acceptance of elastic forces. This lessens the risk of inflammation and/or infection.