# Midline

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## midline

[′mid‚līn]
(mathematics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

## Midline

(1) A midline of a triangle is the line segment joining the midpoints of two sides of the triangle. The midline is parallel to the third side, or base, of the triangle. The length of the midline is one-half that of the base. The areas of the two parts into which the midline divides the triangle are in the ratio 1:3.

(2) The midline, or median, of a trapezoid is the line segment joining the midpoints of the nonparallel sides of the trapezoid. The midline is parallel to the bases of the trapezoid, and its length is one-half the sum of the lengths of the bases.

References in periodicals archive ?
Subjects were included in the data analysis if they were admitted to the NCU between January 1, 2015, and April 30, 2017, and had an order for a PICC and/or midline catheter.
An algorithm (Supplemental Digital Content 1, available at http://links.lww.com/JNN/A162) was developed based on the MAGIC criteria to serve as a decision support system (DSS) for placement of a CVC or a midline catheter.
As shown in Table 1, at admission, the VAD decision was scored as accurate if (1) a peripheral venous catheter is placed and the patient did not receive IV medications that would require central venous access, (2) a midline is placed and the patient did not receive IV medications that would require central venous access, (3) a CVC is placed and the patient received a peripherally incompatible medication, or (4) a PICC is placed and the patient received a peripherally incompatible IV medication or received IV medications for a prolonged duration (Table 2).
Maxillary midline diastema is usually normal after the eruption of maxillary central incisors.
The appliance presented in this case report is aesthetic, convenient for the patient, and sufficient to close maxillary midline diastema, particularly when the patient does not want fixed orthodontic treatment.
The midline diastema: a review of its etiology and treatment.
In an ideal occlusion bilateral symmetric class I molar and canine relationship, normal over jet, over bite and coincident dental midlines must be present.
Etiology of asymmetric molar and canine relationship is multi-factorial and it include presence of impacted or supernumerary teeth, congenitally missing teeth, drifting of teeth in the space which is created due to caries or after premature loss of primary teeth and ectopic tooth eruption.2-7 Etiology of non-coincident dental midlines include premature loss of one primary canine, crowding and missing teeth.8
Observable deviation of facial and anterior tooth midlines prosthet dent 2003; 89: 282-85.
The objective of the present study was to determine the role of facial mid line as a guide for positioning maxillary dental midline for Prosthodontic patients during fabrication of prosthesis.
For an adult patient with a severe skeletal Class III malocclu- sion and a midline deviation, combined surgical-orth- odontic therapy is often the treatment of choice be- cause of its satisfying outcome and stability.1 Camou- flage treatment is usually considered only for border- line patients.2,3 Case reports of nonsurgical treatment of mandibular asymmetries in nongrowing patients are rare because of the difficulty of reducing the skeletal asymmetry without growth.
Maxillary midline had shifted 3mm to the right and mandibular midline was shifted 3mm to the left side.

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