Roth Vs MBT Brackets- which one to choose ?

Additional Notes:-

When you place a lot of tip on the brackets, especially on the canine bracket, it causes the canine crown to tip mesially and the root distally. This leads to mesial movement of the posterior teeth, resulting in anchorage loss. This phenomenon is known as the "Rowboat effect"

Not only will it cause loss of anchorage but it will also extrude the upper incisors deepening the bite

modifications to the MBT had to be made to address this problem. They made the tip to be much less than the Roth , preserving the anchorage without compromising aesthetics

In Roth prescription the bracket tip is higher than those of the MBT

Torque:

To ensure versatility in treatment, it was also decided that upper canine brackets in the MBT™ system would be offered with torque values of -7°, 0°, and +7°. Among these, the 0° and +7° torque options are particularly preferred in cases involving a narrow maxillary arch form and/or prominent canine roots . Lower canine torque is -6°, but 0° or even +6° is available for some cases , if needed.

TIp:

The MBT system incorporated torque and tip modifications to optimize orthodontic treatment mechanics.

In the maxillary incisors, palatal root torque was increased to counteract the common issue of torque loss and to better preserve proper incisor inclination.

Conversely, in the mandibular incisors, labial root torque was enhanced to minimize unwanted proclination during alignment and incase we are going to use class II elastics.

For the maxillary molars, additional buccal root torque was applied to prevent the palatal cusps from hanging down (useful when doing upper arch expansion)

In the mandibular posterior segments, a reduction in buccal root torque was implemented to control the tendency of the molars to exhibit lingual tipping as they move along the archwire.

Illustration showing the "Row-Boat Effect" that happens when correcting the tip of a distally tipped canine , this effect is further exaggerated with the Roth brackets due to the increased tip in the upper canine brackets

Other factors that play a role in the choice of canine bracket is:

• Arch form (-7 torque square / 0 Ovoid / +7 Tapered)

• Extraction decision (Preferable to use +7 in extraction cases to move canine root away from cortical bone)

• Presence or absence of lateral incisor (+7 in cases of lateral incisor substitution)

• Periodontal status (+7 is preferred in a compromised periodonteum)

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