Please assess the completion status of the following clinical trial:

Trial Title: Impact of Treatment of Periodontis on Endothelial Function in Patients With Obstructive Sleep Apnea

Study Design Characteristics:
- Allocation: NON_RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* severe OSA defined by an apnea hypopnea index \> or = 30 per hour~* with or without chronic parodontitis~Exclusion Criteria:~* non equilibrated diabetes~* obesity (BMI \> or = 40)~* active smoker (\> 1 pack per day (20 cigarettes))~* pregnancy~* antibiotics within the preceding three months~* prophylactic antibiotherapy required for the parodontitis treatment~* acute parodontitis or all parontal pathology requiring immediate therapy~* less than 10 teeth

- Gender: ALL
- Minimum Age: 30 Years
- Maximum Age: 70 Years
- Healthy Volunteers: f

Study Arms:
- Obstructive sleep apnea with chronic parodontis (Type: EXPERIMENTAL): patients with severe obstructive sleep apnea (OSA) and chronic parodontis treated for OSA by continuous positive airway pressure (CPAP) and intensive periodontal treatment
- Obstructive sleep apnea without chronic parodontis (Type: NO_INTERVENTION): patients with severe OSA treated by CPAP

Based on this trial design, predict the completion outcome and termination type (if applicable).