Please assess the completion status of the following clinical trial:

Trial Title: Piezo-surgery Technique and Intramuscular Dexamethasone Injection to Reduce Postoperative Pain After Impacted Mandibular Third Molar Surgery

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE4
- Number of Arms: 4.0

Eligibility Criteria:
Inclusion Criteria:~* Age from 15 to 30 years,~* Having mandibular impacted third molars,~Exclusion Criteria:~* Heavy smokers (≥20 cigarettes),~* Uncontrolled systemic conditions,~* Infection of the surgery site,~* Psychological problems,~* History of allergy to dexamethasone, amoxicillin, or acetaminophen.

- Gender: ALL
- Minimum Age: 15 Years
- Maximum Age: 30 Years
- Healthy Volunteers: t

Study Arms:
- Rotatory Instruments without Dexamethasone injection (Type: EXPERIMENTAL): Surgical extraction of Impacted Mandibular Third Molar using conventional rotatory instruments to perform osteotomy without Intramuscular Dexamethasone injection
- Rotatory Instruments with Dexamethasone injection (Type: EXPERIMENTAL): Surgical extraction of Impacted Mandibular Third Molar using conventional rotatory instruments to perform osteotomy with 8 mg Intramuscular Dexamethasone injection 30 min before surgery
- Piezosurgery technique without Dexamethasone injection (Type: EXPERIMENTAL): Surgical extraction of Impacted Mandibular Third Molar using the piezosurgery technique without Intramuscular Dexamethasone injection
- Piezosurgery technique with Dexamethasone injection (Type: EXPERIMENTAL): Surgical extraction of Impacted Mandibular Third Molar using the piezosurgery technique with 8 mg Intramuscular Dexamethasone injection 30 min before surgery

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