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Find here the most frequently asked questions on SICAT Air and OPTISLEEP.


Minimal demands on the patient’s dentition?

The basic prerequisite for successful therapy is that the OPTISLEEP has a good and retentive fit on the existing teeth.

The patient’s dentition should fulfil the following requirements:

  • no removable dentures
  • no loose teeth, no pronounced periodontosis
  • no restorations planned
  • no missing teeth in the area of the connector pins (tooth area 13-15, 23-25, 36-38, 46-48) or in the American dental notation (4-6, 11-13, 17-19, 30-32)
  • at least 3 teeth in the area of the premolars and molars
  • Tooth 5 or teeth 20 or 29 (odontograms) should not be the ending teeth
  • Sufficient undercut regions providing retention (crown margins, dental ridges, poor buccal fillings etc. cannot be used).

To be considered:

  • Elongated teeth in the retral region might have to be omitted. This will result in a shortened splint and might affect retention.
  • The midline deviation should not exceed 2.5 mm.


Cerec Scan

  • During intraoral scanning, the complete teeth and in particular the areas below the tooth equator must be included to ensure retention.
  • Verify proper alignment of 3D X-ray and optical surface data within SICAT Air.
How do I position my patient for the CBCT scans?

For the CBCT scan which will be used for the analysis of the upper airway, position the patient’s chin on the chinrest and stabilize the patient’s head.

The patient should gently bite onto a bite stick or some cotton rolls without cramping. The tongue should lie loosely on the palate. Please select the appropriate exposure setting to show the airway.

For a second CBCT scan, which is then used for selecting the therapeutic position, the patient should carefully bite on a white 5mm George Gauge bite fork with registration material or a MATRx bite block which brings him in a therapeutic position.

Are two 3D scans necessary to order an OPTISLEEP appliance?

No, you don’t have to necessarily scan the patient twice. Two scans enable you to compare and show your patient how the treatment with OPTISLEEP will open the airway.

If you want to proceed without a CBCT scan used for the airway analysis, just conduct a CBCT scan with the appropriate protrusion of the mandible with 5 mm vertical clearance in the front and order the OPTISLEEP based on this data.

Can I use a CBCT scan without the patient being in protrusion to order an OPTISLEEP?

No, the scan in protrusion (= final therapeutic position) is required for ordering an OPTISLEEP.

What is the required CBCT volume size?

In order to capture the airway, the recommended minimal volume size is 11×10. It is not mandatory to capture the TMD for OPTISLEEP. To order an OPTISLEEP appliance without analysis of the upper airway, a volume size of 8×8 is sufficient.

How should I have the patient act during the 3D scan?

Please have the patient rest his chin on the chin holder and that he stands still afterwards. He should breath normally and must not swallow. His tongue should lie loosely at the roof of the mouth.

Where can I purchase a George Gauge bite fork?

To learn more about pricing and how to purchase George Gauge bite forks, please inquire with your local dental supply representative. You can also use other bite forks if the vertical opening is a minimum of 5mm in the incisal area with the ability to measure the grade of protrusion.

Why does the vertical clearance between the front teeth need to be 5mm?

The OPTISLEEP must fit between both arches. It features a flat plane comparable to a plastic disk between the teeth.

To make a quick test of the necessary opening between the front teeth in order to ensure the requested clearance of 2.5mm overall the arch, you might put a plastic plate of 2.5mm thickness between the patient’s teeth.

Measure the distance between the front teeth. Place the bite fork between the teeth and add sufficient registration material between the front teeth to achieve the appropriate incisal clearance previously measured.

What is the recommended protrusion degree during the scan?

We recommend following the indicated protrusion degree in the George Gauge manual.

What is the minimum age the OPTISLEEP appliance may be used?

The appliance can be used by patients 18 years and older.

Can I use an OPTISLEEP therapeutic appliance for an edentulous case?

No, the OPTISLEEP appliance is tooth-borne and not indicated for patients who wear removable partial or full dentures.


The patient should have

  • at least 3 teeth in each quadrant in the premolar and molar area
  • no temporary prosthetics
  • no elongated teeth, if so, they must be considered by additional clearances while the interocclusal recording with the bite fork

For further information, please note the Instructions for use for the medical professional which is available in the download area.

Will health-insurance cover the treatment?

In many cases the treatment is covered by medical insurances. Patients should contact their health insurance company to evaluate if the OPTISLEEP appliance is covered.

What is required for ordering an OPTISLEEP?
  • SICAT Air Software
  • 3D CBCT system (note volume depending on use, OPTISLEEP order min 8×8, airway analysis min 10×11)
  • George Gauge or other bite fork with determination of the degree of protrusion
  • Optical scans of entire upper and lower jaw or latest stone models sent to our laboratory
Can I match optical impressions from other systems than CEREC?

Yes, from the SICAT SUITE version 1.4, you can match STL, SSI and SIXD files.

Where can I learn more about the OPTISLEEP workflow?

The SICAT OPTISLEEP workflow is described on the OPTISLEEP page of this website as well as in our manual. The manual is available for download in the download area as well as on

What does AHI stand for?

AHI stands for APNEA HYPOPNEA INDEX which indicates the severity of sleep apnea and is represented by the number of times the patient stops breathing for longer than 10 seconds during an hour of sleep. It is determined during the sleep examination.

Up to which AHI value can be treated with the OPTISLEEP?

The OPTISLEEP is indicated for mild and moderate cases of Obstructive Sleep Apnea (AHI values between 5 and 29). In certain cases, the doctor can also use OPTISLEEP for more severe OSA cases.

Can Obstructive Sleep Apnea be cured by oral appliance treatment?

No, all appliances are considered a long-term treatment but not a cure.

What is the turnaround time for an OPTISLEEP?

General turnaround for OPTISLEEP appliance is 10 working days in our laboratory.

Can I do measurements within the software?

Yes, you can carry out distance and angle measurements manually. The relevant values for the airway comparison are automatically calculated within SICAT Air.

How can I adjust the grade of protrusion for OPTISLEEP?

You can adjust the grade of protrusion for OPTISLEEP with the help of exchangeable connectors which are available in 10 different sizes (1 mm increments). This is described in detail in the Instructions for use for the medical professional which you can download in the download area.

Is it possible to reorder connectors?

Yes, you can order the complete set of connectors in the SICAT shop.

Are there possible contraindications for oral appliance therapy?

OPTISLEEP therapeutic appliances may not be used in the following cases:

  • Central sleep apnea
  • Severe respiratory diseases
  • Loose teeth
  • Advanced periodontal disease
  • Persons under 18 years
  • Edentulous jaw

For any further questions concerning OPTISLEEP please refer to the OPTISLEEP manuals: Application and care information (for patient) and the Instructions for use for the medical professional. You can download these manuals in the download area, category manuals > sleep medicine.


Find detailed information on the Sleep Medicine sub-page.


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Last Update: 2019-10-21