Sleep Apnoea and Dentistry: An Underestimated Connection
Obstructive sleep apnoea (OSA) arises from intermittent obstruction of the upper airway during sleep. The result is repeated breathing pauses, oxygen drops, and sleep disruptions — with systemic effects on the cardiovascular system, metabolism, and immune function. For implantology, three aspects are particularly relevant:
Bruxism Co-Factor
Sleep apnoea and bruxism frequently co-occur. Studies show a coincidence of 30–50 %. Both conditions increase mechanical load on implants.
Systemic Comorbidities
OSA is associated with hypertension, type 2 diabetes, cardiac arrhythmias, and elevated inflammatory status — all factors that can influence osseointegration.
Splint Interaction
Mandibular advancement devices (MAD) permanently alter the occlusion. These changes must be considered during implant planning.
Risk Assessment: How Dangerous Is Sleep Apnoea for Implants?
The evidence is nuanced: sleep apnoea per se is not a contraindication for dental implants. The risk arises from associated factors — particularly uncontrolled bruxism, systemic inflammatory activity, and the mechanical effects of splint therapy.
| Factor | Risk for Implant | Mechanism |
|---|---|---|
| OSA alone (treated) | Low | No direct effect on osseointegration |
| OSA + bruxism | Elevated to high | Mechanical overload, micro-movements |
| OSA + diabetes | Elevated | Impaired healing, increased infection susceptibility |
| OSA + hypertension | Slightly elevated | Reduced microcirculation in bone |
| MAD splint (ongoing) | Moderate | Occlusal change, temporomandibular joint stress |
| OSA untreated | High | Systemic inflammation, hypoxia, bruxism |
CPAP Therapy and Implant Treatment: What to Consider
Patients under CPAP therapy (Continuous Positive Airway Pressure) are generally well managed — the sleep apnoea is controlled, and systemic inflammatory status normalises. Nevertheless, practical considerations arise for implant treatment:
- 01Perioperative CPAP use: During the healing phase, the CPAP mask should fit correctly and not cause pressure sores in the implant region. This is particularly important for anterior maxillary implants.
- 02Dry mouth from CPAP: CPAP devices can cause xerostomia, which increases the risk of peri-implantitis. Humidified devices and consistent oral hygiene are essential.
- 03Bruxism screening: Bruxism can persist even under CPAP. A polysomnogram or EMG measurement before implantation is recommended for OSA patients.
- 04Systemic control: Comorbidities (diabetes, hypertension) should be optimally managed before implantation — coordination with the treating internist or sleep medicine specialist is advisable.
Mandibular Advancement Device (MAD) and Implant Planning
Patients wearing a mandibular advancement device (MAD) present a particular challenge. The MAD advances the lower jaw to keep the airway open — but permanently alters the occlusion and temporomandibular joint position in the process.
Clinical Effects of MAD
- Occlusal change: Anterior shift of bite position, possible change in vertical dimension
- TMJ stress: Permanent protrusion stresses the articular disc
- Tooth movement: Long-term wearers often show changes in anterior tooth position
- Muscle adaptation: Masticatory muscles adapt to new jaw position
Consequences for Implant Planning
- Occlusal analysis with MAD: Planning must account for the bite with the splint in place
- Prosthetic design: Crown shape and occlusal surface must be MAD-compatible
- TMJ status: CMD screening recommended before implantation
- Sleep medicine coordination: Coordinate MAD adjustments after implantation
Important: Implant planning for MAD wearers must account for the bite with the splint in place. Planning based on the natural bite without MAD leads to occlusal conflicts after restoration.
Digital Treatment Protocol for Sleep Apnoea Patients at IIDZ Vienna
IIDZ Vienna has developed a structured digital protocol for implant patients with sleep apnoea. It integrates sleep medicine findings into digital implant planning and ensures that all relevant factors are captured and considered before treatment.
Sleep Medicine History
Recording OSA severity (AHI), current therapy (CPAP/MAD/none), bruxism screening, comorbidities, and medication.
Digital Occlusal Analysis
3D scan of the dentition with and without MAD splint. Digital analysis of bite position, occlusal contacts, and TMJ position using T-Scan system.
CBCT-Based 3D Planning
Implant positioning accounting for MAD-altered occlusion. Bone quality and quantity are analysed using the CBCT dataset.
Polysomnography Coordination
When uncontrolled bruxism is suspected: referral for polysomnography or home EMG measurement before implantation.
CAD/CAM Protective Splint
For patients with bruxism co-factor: fabrication of a CAD/CAM occlusal splint alongside the implant restoration. The splint protects the implant during the healing phase.
Interdisciplinary Follow-Up
Regular monitoring in coordination with the sleep medicine specialist. Adjustment of MAD after completed implant restoration if required.
The Bruxism Co-Factor: When Sleep Apnoea and Grinding Coincide
The combination of sleep apnoea and bruxism is clinically particularly relevant. Both conditions share neurobiological mechanisms (central nervous arousal reactions, dopaminergic dysregulation) and co-occur in 30–50 % of those affected. For implant patients, this means a doubling of risk factors:
| Situation | 10-Year Success Rate | Primary Risk |
|---|---|---|
| No OSA, no bruxism | 95–98 % | Peri-implantitis |
| OSA treated, no bruxism | 93–96 % | Dry mouth, peri-implantitis |
| OSA + bruxism, untreated | 65–75 % | Mechanical failure, early loss |
| OSA + bruxism, treated + splint | 88–93 % | Screw loosening, marginal bone loss |
| OSA + MAD + digital protocol | 90–94 % | Occlusal conflict (if not coordinated) |
Conclusion: Sleep Apnoea Requires Interdisciplinary Planning — Not Exclusion
Sleep apnoea is not a contraindication for dental implants — but it requires careful, interdisciplinary planning. The decisive factors are whether the condition is treated, whether a bruxism co-factor is present, and how splint therapy affects the occlusion.
Patients under CPAP therapy without bruxism have only a slightly elevated risk, which is manageable through consistent oral hygiene and regular follow-up. Patients with a MAD splint require a digital occlusal analysis that accounts for the bite with the splint in place. Patients with a bruxism co-factor additionally receive a CAD/CAM protective splint.
At IIDZ Vienna, sleep apnoea history-taking is part of every implant consultation. Coordination with the treating sleep medicine specialist is standard — not the exception — for complex cases.
Guide
Bruxism: Causes, Consequences and Treatment
Complete patient guide
Article
Dental Implant and Bruxism
How grinding jeopardises osseointegration
Institut für Implantologie und digitale Zahnmedizin Wien
Wissenschaftliche Redaktion
Weitere Artikel
Thematisch verwandt
Hinweis: Diese Inhalte dienen ausschließlich der allgemeinen Information und ersetzen keine individuelle zahnärztliche Beratung. Das Institut für Implantologie und digitale Zahnmedizin Wien ist eine gemeinnützige, unabhängige Wissenschaftsplattform — kein Behandlungsbetrieb. Alle Angaben entsprechen dem aktuellen Stand der wissenschaftlichen Literatur; individuelle Behandlungsentscheidungen müssen stets mit einem approbierten Zahnarzt oder Facharzt getroffen werden.