Introduction
Malocclusion type 1 ‘Neutrocclusion’ can lead to abnormal tooth to tooth or soft tissue contact, that could be associated with trauma or oronasal fistula or ulceration or pulpites or erosion or pulp exposure and interrupt normal rostral cross bite. in cases like this we should handle the case without extraction or crown amputation as we can deal with this by orthodontic art and correct the situation within 4 to 6 weeks maximum and preserve the function of the teeth normally. This abnormal position of canines could be mesioversion, distoversion, linguversion or labioversion.
 
Technique
• Principle of anchorage
• WHAT IS anchorage? It is the resistance to undesired tooth movement, and it is the most important factor for success and failure of orthodontic treatment.
 • Why anchorage? According to Newton 3rd rule For every action there is a reaction equal in magnitude and opposite in direction. ( picture of premolar tooth as dental anchorage) illustration 1 - Mini screw is easy to use as it has smaller size, ease of insertion and removal, low cost than implants on plates and mini plates in addition to no waiting period needed before loading no need for laboratory work and improved treatment outcome.

Explanation
 Mini screw is a temporary anchorage device (TADs), Mini plates surgical. (picture of mini screw as temporary anchorage) illustration 2 Indication:
1. (Absolute anchorage) in high anchorage demand situation.
2. In adequate number of anchored units (hypodontia or extracted)
3. Specific tooth movement.
4. Provide support for skeletal treatment (Implant supported RME)

Contraindication
1. Medical problems (Bleeding disorders- allergy- bone disease- diabetes etc)
2. Poor oral hygiene.
3. Inadequate bone depth and quality.
4. Bone pathology status.

Material
Most mini screws are made of titanium or Titanium alloy

Advantages
1. Biocompatible and make a direct contact between bone and metal surface
2. Corrosion resistance
3. Enhanced physical properties (strength- wear resistance etc.)

Composition:
1. Tip: a) self taping b) self drilling
2. Body- cylindrical
3. Neck and head: low profile to facilitate oral hygiene

Parameters affecting successful rate
A) Pet factor
- Age Before 9 months success rate decreased as bone density decreased
- Oral hygiene If poor decrease success rate

B) Mini screw factor
- Diameter If less than 1.1 mm decrease successful rate If more than 1.5 mm no difference
- Length depends on breed size
10 mm to 12 mm available for large breeds
8 mm to 10 mm Medium breeds
6 mm to 8 mm Toy breeds
No difference in stability if it more than 12 mm long
- Head Cylindrical Self drilling Self tapping
- Shape Small diameter and low profile to enhance oral hygiene

C) Operator factor
- Insertion sites Most common sites are between premolar and molar however other sites are acceptable according to biomechanics.
- Insertion angle Decrease insertion angle decrease stability as it approach root surface However systematic review ( no relation )
- Loading protocol Immediate loading does not decrease success rate
- Experience Increase success rate