רפואת הפה והשיניים - עיתון ההסתדרות לרפואת שיניים בישראל - כרך ל"ז, גיליון מס' 2 אייר תש"פ

Table 1: Four main treatment modalities of skeletal class III. The table describes the design, age, time & duration, forward movement of the maxilla, downward and backward mandibular rotation, dental effect and total skeletal effect of the four main modalities Modalities Design Age Dental Effect

Time & Duration

Forward Movement of Maxilla

Downward and Backward Mandibular Rotation

Total Skeletal Effect

Frankel's FR-III appliance

2.5 years full time wear

Functional appliance that is constructed while the mandible is positioned posteriorly and integrated with pads to stretch the upper lip forward.

Early

Little if any

++

1. Proclination of maxillary incisors and lingual tipping of the lower incisors. 2. rotation of the occlusal plane 1.Forward movement of the maxillary dentition 2. Lingual tipping of the lower incisors

Limited changes in extremely mild cases.

Facemask

1.Maxillary bonded or banded

In young children ages 8 or younger. Maximal

350-400 grams per

Total 3.0 mm in one year

++

Mild to moderate

side for 12-14 hours per day

removable splint 2.Fixed appliance with extension arms to trans- palatal arch 3. Bonded to the maxilla

age is 10-11.

Chin cup

An orthopedic restraining appliance

Early

Continuously until the completion of facial growth 400 grams per side for a minimum of 16 hours per day

No effect

+-

Lingual tipping of the lower incisors.

Not effective

Skeletal anchorage

Early

1 Miniplates combined with facemask protraction 2. Miniplates connected to lower jaw with class III elastics.

0.45 mm and more per month

Minimal

Minimizes dento-alveolar changes

Not suitable under the age of 10.5-11

14

.2 רפואת הפה והשיניים, אייר תש״פ, כרך ל״ז, גיליון