The Step-by-Step Roncone PhysioDynamicSystem (PDS) Prescription

The Roncone PhysioDynamicSystem of interactive SLB’s, wire forces, wire sizes, archform, and bracket prescription will be shown to be very physiological and move teeth very quickly with “directional” forces. Additionally, there are little to no side effects which have to be compensated for during treatment. It will also virtually eliminate root resorption.

Let’s begin with the goals of the Roncone PhysioDynamicSystem.

They are:

  1. To eliminate posterior balancing interferences
  2. To eliminate anterior “overcoupling”
  3. To control anchorage without adding to the bracket system
  4. To allow full tooth alignment and “arch fulfillment” with a light, round, titanium wire
  5. To eliminate excessive curves of Spee and Wilson
  6. To allow full functional finishing to be accomplished in a gentle manner in less than a full-sized wire

Upper Incisors

Increased torque so that finishing in less than a full sized wire will still give the torque necessary to eliminate “over-coupling” of the upper and lower anteriors, thus eliminating fremitus and post treatment relapse, or condylar displacement when fixed lower retainers are used.

U1 Torque 19          U2 Torque 10

Tip 5                        Tip 8

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Upper Canine

Zero torque eliminates the heavy contact between the upper and lower canines, eliminating the lingual displacement of the lower canine and eventual lower anterior crowding. The angulation is appropriate to achieve proper canine guidance in both extraction and non-extraction cases.

Torque 0

Tip 8

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Upper Premolars

The increased buccal root torque eliminates the lingual cusp interferences of other techniques and assists in “seating” the posterior occlusion. The distal root angulation counteracts any Class II elastic forces, seats buccal cusps, and achieves the most aesthetic tooth position. The best tooth aesthetics occur with an increased distal tip from incisors through premolars.

Torque -10

Tip 4

Rotation 2D

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Upper Molars

The increased buccal root torque eliminates lingual cusp balancing interferences. It provides incredible anchorage and virtually eliminates the need for TPAs, TAD’s, Nance’s, etc. Minimum anchorage cases can use the 20°/12° molar.

Anchorage Molar

In combination with large diameter round wires (.018 HANT or (2) .014 HANT) typical flaring of incisors is non-existent when bringing down high or impacted canines. No ligation of incisors is required.

Torque -20

Tip 0

Rotation 20D

Non-Anchorage Molar

Used when anchorage is not a factor in treatment planning.

Torque -20

Tip 0

Rotation -12D

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Lower Incisors

The positive torque of 2° is appropriate for finishing in less than a full-sized wire and for mechanics that are not totally dependent on heavy, Class II mechanics such as Herbst, and heavy, long term Class II elastics, etc.

Torque 2

Tip 0

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Lower Canine

The decreased torque allows for a more upright and aesthetic lower canine which harmonizes with the lower incisors and the upright lower first premolars. It also achieves, in combination with the zero torque upper canine, excellent guidance without too heavy of a contact. There is no mesial lingual rotation built into the slot which avoids the lingual rotation of the canine. The bracket can be placed in the middle of the crown.

Torque -3

Tip 5

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Lower First Premolar

Decreased lingual crown torque keeps excellent arch form, avoids balancing interferences and a forward slide from C.R. to C.O. This slide is very common and is due to the excessive lingual tip of the first premolar in most techniques.

Torque -7

Tip -2

Rotation 2D

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Lower Second Premolar

This tooth is also very upright in keeping with the full arch philosophy.

Torque -10

Tip -2

Rotation 2D

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Lower First Premolar

The large decrease in lingual crown torque eliminates the very common lingual “roll-in” of these teeth. Balancing interferences are eliminated also. The slight disto-lingual rotation fits beautifully with either the maxillary anchorage (20° T, 20° R) or non-anchorage (20° T, 12° R) molars.

Torque -13

Tip 0

Rotation 4D

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Lower Second Molar

Again the lingual crown torque is significantly reduced from the majority of preadjusted prescriptions. The lower arch finishes with an upright, natural wide result which coordinates beautifully with the upper arch.

Torque -10

Tip 0

 

This prescription is ideal for use with the .022 x .028 slot size. The largest wire used is a .019 x .025 beta titanium wire (FMA). Stainless steel wires are essentially never used. The Roncone PDS archform is necessary to achieve superb results.

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