Thank you for contacting CPAP SUPPLY USA.COM. At this time, there is not a Full face mask that offers that feature. You may want to take a look at the Fisher and Payckal 431, the 432 and the new Forma Full face masks. These full face mask actually fit under the chin more to give more support.
You also may want to try sleeping with your head tilted back slightly using a pillow that provides neck support and will position your head back slightly.
Another option is to work with a dentist that specializes in fitting oral devices that help facilitate this. There are other options, such as the CPAP Pro which utilizes a mouth piece and nasal pillows.
Please check our website www.cpapsupplyusa.com We offer all of the mask mentioned. Your dentist may be able to suggest someone locally that can help from his perspective.
Please contact us again if we can be of further help.
Debbie Shirley,RRT