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MAD Dental Side Effects

While Mandibular Advancement Devices boast high compliance rates for OSA treatment, their mechanism of action applies continuous mechanical force to the teeth and jaw joint, carrying long-term risks.

The Physics of Advancement

A custom MAD anchors to the upper and lower dental arches to pull the mandible forward. According to Newton's third law, the force holding the jaw forward exerts an equal and opposite reciprocal force on the anchoring teeth. The upper teeth are pushed backward, and the lower teeth are pushed forward.

Long-Term Occlusal Changes

Clinical studies following MAD patients over 5+ years demonstrate that the vast majority experience some degree of measurable occlusal (bite) change. The most common manifestations include:

  • Decreased Overjet: The horizontal distance between the upper and lower front teeth shrinks.
  • Decreased Overbite: The vertical overlap of the front teeth lessens, sometimes resulting in an anterior open bite.
  • Molar Mesialization: The lower molars tilt forward.
  • Interproximal Gaps: Spaces opening up between teeth, particularly in the lower arch.

Patient Perception vs. Clinical Measurement

Interestingly, while almost all long-term users show measurable cephalometric changes, only a small percentage (usually <15%) report being bothered by the changes. The shifts happen so slowly that the patient adapts. However, for a patient with extensive anterior dental work (like veneers), these changes can be highly problematic.

Mitigation Strategies

To minimize dental side effects, Dental Sleep Medicine specialists employ several protocols:

  • Morning Repositioners: A hard acrylic wafer the patient bites into for 10-15 minutes every morning to help guide the mandible back into its native centric occlusion.
  • Maximal Coverage: Custom devices cover all teeth in the arch, distributing the force as evenly as possible to prevent individual tooth tipping.
  • Conservative Titration: Advancing the jaw only as far as absolutely necessary to resolve the apnoea, rather than advancing to maximum protrusion.