VERTICAL DIMENSION’S CONTROLE BY TAD’S(Temporary anchorage devices); A Systematic Review

Objectives:
The objectives of this review are to find the evidence regarding;

- The amount of stable intrusion achieved with the help of TAD’s (Temporary Anchorage Devices).
- The factors affecting stability of TAD’s in skeletally high vertical dimensions.

Methods: The steps in a systematic review;
Following steps were used for review;
Step 1: Framing questions for this review
Step 2: Identifying relevant work
Step 3: Assessing the quality of studies
Step 4: Summarizing the evidence
Step 5: Interpreting the findings

Over 315 articles on Google and 228 articles on Pub med were reviewed;
Results: Stability;
Factors not related to stability are;
Screw length
Time of loading
Method of placement;
Location of implant
Age
Gender
TMD symptoms
Anteroposterior jaw relationship
Controlled periodontitis
Risk Factors; for mobility
High mandibular plane angle
Tissue inflammation after implant placement
1mm has lower success rate than greater diameter (1.5 and 2.3mm)
There have been no reports on long term stability of cased treated by orthodontic implants yet.
Intrusion;
The amount of intrusion during active treatment (T0-T1) was 2.2±0.8 and relapse during retention period (T1-T2) was 0.5±0.2 and the remaining intrusion 1.7±0.5 mm was stable throughout entire treatment (T0-T2).
Conclusions:
Maxillary molar intrusion was found to be 3.2 mm roughly with mini implants or miniplates.
Using maximum insertion torque as an indication for primary stability should be avoided.
However the most efficient control may result from simultaneous application of intrusion force from buccal and palatal aspects.