Effect of anterior mandibular movement by non-fixed sagittal sprit ramus osteotomy on postoperative skeletal formation

Effect of anterior mandibular movement by non-fixed sagittal sprit ramus osteotomy on postoperative skeletal formation - Effect of anterior mandibular movement by non-fixed sagittal sprit ramus osteotomy on postoperative skeletal formation

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

JPRN

Registry ID

JPRN-UMIN000050112

Enrollment

Registered

2023-01-23

Start date

2022-03-01

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

jaw deformity

Interventions

None listed

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: (1) Patients who underwent mandibular anterior movement surgery using PPS for skeletal mandibular retraction cases at Nagasaki University Hospital Oral Surgery and Imakiire General Hospital from April 1, 2008 to June 30, 2021. (2) Patients with head standard X-ray photographs before surgery (T1), immediately after surgery (T2), and 6 months after surgery (T3)

Exclusion criteria

Exclusion criteria: (1) Patients who underwent other jaw deformity surgery until T3. (2) Patients with jaw deformity as a symptom of systemic disease or syndrome.

Design outcomes

Primary

Measure	Time frame
During the period from April 1, 2008 to June 30, 2021, at Nagasaki University Hospital Oral Surgery and Imaikire General Hospital, a mandibular anterior movement surgery was performed in a case of skeletal mandibular retraction before surgery (T1). Immediately after surgery (T2), The subjects were patients who had a head standard X-ray photograph 6 months after the operation (T3). In the lateral head X-ray standard photograph, the one in which the SN is rotated clockwise by 7 degrees is called the x-axis (x-axis), and the straight line that goes straight to this and passes through S (sella) is called the y-axis (y-axis). This method is a commonly used method for evaluating the translation of the skeleton. 1) Angle analysis SNB: The angle between the SN (sella-nasion) line and the NB (nasion-point B) line. (2) Mandibular plane (FMA): The angle between the Frankfurt plane (FH) and the mandibular plane (MP). The angle between the FH plane and the plane of the anterior margin of the mandibular branch. U1-FH: The angle between the axis of the maxillary central incisor (U1) and the FH plane. L1-MP (IMPA): The angle between the axis (L1) of the mandibular central incisor and MP. L1-FH (FMIA): The angle between the axis of the mandibular central incisor and the FH plane. 2) Coordinate measurement Me (x, y) The vertical length from Menton (Me) to the x-axis or y-axis. 3) Distance measurement U1 to PP: Vertical length from the end of the maxillary central incisor to the palatal plane (PP). L1 to MP: Vertical length from the end of the central mandibular incisor to the mandibular surface.	—

Measure

Time frame

During the period from April 1, 2008 to June 30, 2021, at Nagasaki University Hospital Oral Surgery and Imaikire General Hospital, a mandibular anterior movement surgery was performed in a case of skeletal mandibular retraction before surgery (T1). Immediately after surgery (T2), The subjects were patients who had a head standard X-ray photograph 6 months after the operation (T3). In the lateral head X-ray standard photograph, the one in which the SN is rotated clockwise by 7 degrees is called the x-axis (x-axis), and the straight line that goes straight to this and passes through S (sella) is called the y-axis (y-axis). This method is a commonly used method for evaluating the translation of the skeleton. 1) Angle analysis SNB: The angle between the SN (sella-nasion) line and the NB (nasion-point B) line. (2) Mandibular plane (FMA): The angle between the Frankfurt plane (FH) and the mandibular plane (MP). The angle between the FH plane and the plane of the anterior margin of the mandibular branch. U1-FH: The angle between the axis of the maxillary central incisor (U1) and the FH plane. L1-MP (IMPA): The angle between the axis (L1) of the mandibular central incisor and MP. L1-FH (FMIA): The angle between the axis of the mandibular central incisor and the FH plane. 2) Coordinate measurement Me (x, y) The vertical length from Menton (Me) to the x-axis or y-axis. 3) Distance measurement U1 to PP: Vertical length from the end of the maxillary central incisor to the palatal plane (PP). L1 to MP: Vertical length from the end of the central mandibular incisor to the mandibular surface.

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Countries

Japan

Contacts

Public ContactSHUN NARAHARA

nagasaki-university hospital oral surgery

narashun@nagasaki-u.ac.jp095-819-7704

Outcome results