Biobloc Appliances

For correction of severe arch constriction and overjets

The Biobloc (Stage 1, 2 and 3) appliances are useful alternative arch development methods in MRC's treatment systems. The appliances are used sparingly as they cannot be combined with MRC's appliances to improve function and, when used, it is mainly the Biobloc Stage 1 (BB1) or, very rarely, the Stage 3 (BB3). The BB1 is useful for severe arch restrictions (especially transverse) when the BWS cannot be used. It is reserved mainly for use in the primary or early mixed dentition, as well as approximating the central incisors. The Biobloc is proficient in quick expansion of the arches in all three dimensions but is very technique sensitive and tends to worsen patients' function. The BB3 is used for patients with a severe overjet who cannot retain their Myobrace® appliance. This page will focus on the BB1 appliance, since the others are not commonly used in Myobrace® treatment. For more information on the Biobloc appliances, please complete our advanced online courses.

BB1 Design Features

The design features of the Biobloc Stage 1 (BB1) are ideally suited to provide efficient expansion of the upper arch, especially transverse expansion, while allowing for approximation of the incisors.

Directions for Use

The Biobloc Stage 1 (BB1) interferes with patient function, thus it is recommended that the patient remove their Biobloc and wear their Myobrace® for one hour while awake, then immediately placing the Biobloc back into their mouth. The patient is instructed to turn the expansion screw one quarter of a full turn, every 24 hours, until sufficient arch development is achieved. The patient is seen every two to four weeks and, in that time, the practitioner adjusts the appliance while ensuring the appliance is being turned correctly. The Biobloc should not be used for any more than four to six months. 

Instructions for adjustment:

  • Step 1

    Remove the Biobloc from the patient's mouth, paying attention to the retention of the appliance and the patient's oral hygiene. 

    Step 1
  • Step 2

    Advance the labial bow 1-2mm in the anterior direction.

  • Step 3

    Adjust the catenary wires by 1-2mm in the anterior direction.

  • Step 4

    Adjust the retention clasps and replace the Biobloc in the patient's mouth, ensuring that it is tightly retained and stable. Also ensure that the patient can remove and replace it.

    Step 4
  • Step 5

    Instruct the patient to turn the expansion screw 1/4 of a full turn every 24 hours. The patient should remove the Biobloc and wear their second stage Myobrace® appliance for one hour every day (before returning the Biobloc). Recall the patient again in two to four weeks.

Important Notice

The Biobloc requires further training in order to become competent in its use. For more information on the Biobloc, please complete our advanced online courses.

Incorrect usage of the appliance can result in adverse side effects.

Biobloc - Case Studies


Appliance Instructions

Downloadable pdf document with instructions specifically for the Biobloc.

Download Resource

Myobrace® Appliance Catalogue

Downloadable pdf document detailing the Myobrace® appliance range.

Download Resource

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