Evidence Trace, complete trial record

In plain terms

In plain terms: Oral appliance (mandibular advancement) for obstructive sleep apnea has some human trial evidence supporting it, but the evidence is not yet strong enough for EBL to call it established. It is worth knowing about and worth discussing with your clinician.

Oral appliance (mandibular advancement) for obstructive sleep apnea

B Supported: a good trial, backed by more

Category Devices

Evidence A randomized crossover against CPAP and network meta-analyses of randomized trials

Reviewed October 2026

PMIDs 23413266 · 26624827 · 26497082 · 16437429

The endpoint this grade is based on: Surrogate biomarker endpoint

The evidence as the record states it

Evidence record

PMID 23413266 PMID 26624827 PMID 26497082 PMID 16437429

Phillips et al. (Am J Respir Crit Care Med, 2013; PMID 23413266): randomized crossover, 126 adults, 1 month on each treatment. Bratton et al. (JAMA, 2015; PMID 26624827): network meta-analysis of 51 randomized trials on blood pressure. Bratton et al. (Lancet Respir Med, 2015; PMID 26497082): network meta-analysis of 67 randomized trials on sleepiness, with possible publication bias noted by the authors. Giles et al. (Cochrane Database Syst Rev, 2006; PMID 16437429): CPAP lowered the apnea-hypopnea index about 8 events an hour more than an oral appliance in crossover trials.

PMID 23413266 PMID 26624827 PMID 26497082 PMID 16437429

Evidence by specific use

Apnea severity, daytime sleepiness and blood pressure against inactive control and against CPAP

Grade B

In a crossover of 126 adults, CPAP lowered the apnea-hypopnea index further (4.5 against 11.1 events an hour) while the appliance was worn longer, and sleepiness, driving simulator results and quality of life improved by similar amounts (Phillips et al., Am J Respir Crit Care Med, 2013; PMID 23413266). Against inactive control the appliance lowered systolic pressure about 2 mmHg, the same as CPAP (Bratton et al., JAMA, 2015; PMID 26624827), and Epworth scores 1.7 points, 0.8 less than CPAP (Bratton et al., Lancet Respir Med, 2015; PMID 26497082). Surrogate and self-reported outcomes cap the letter at B.

PMID 23413266 PMID 26624827 PMID 26497082 PMID 16437429

Why Grade B and not Grade A

Grade B reflects moderate human evidence -- typically a single strong trial, multiple smaller trials, or surrogate endpoint data without hard clinical outcome replication. To reach Grade A, Oral appliance (mandibular advancement) for obstructive sleep apnea would require at least one additional independent randomized trial demonstrating a hard clinical endpoint or objectively measured functional outcome in a comparable population.

What this grade covers and what it does not

Grade B on apnea severity, daytime sleepiness and blood pressure, from a randomized crossover against CPAP (Phillips et al., 2013; PMID 23413266) and two network meta-analyses of randomized trials (Bratton et al., 2015; PMIDs 26624827, 26497082). WHY NOT A: the outcomes are breathing counts, a questionnaire and blood pressure. WHAT THIS GRADE DOES NOT COVER: cardiovascular events, which no oral appliance trial cited here measured; people without enough healthy teeth to hold the device; and over-the-counter boil-and-bite mouthguards, which the trials did not test.

What would move this grade

An independent randomized trial demonstrating a hard clinical endpoint -- mortality, major adverse event, or objectively confirmed functional improvement -- in an adequately powered sample, with results independently replicated, would support Grade A.

How to track whether this is working Apnea-hypopnea index on a retest with the appliance in place, the Epworth Sleepiness Scale, and nightly hours of wear.