Eligibility criteria for participants
tooth
PERIODONTAL INFLAMMATION

The inclusion criteria were as follows:1) Patients are indicated for the surgical removal of IMTMs and agreeable to sign an informed consent.2) Patients aged between 18 to 65 years old.3) CBCT demonstrated that the IMTM was in horizontal position and the crown was located below the cervical line of the M2s (Class C) (Fig 4) There was no acute soft tissue and periodontal inflammation of the posterior molars, and the M2 was firm.Preoperative CBCT image. #38 was in a horizontal position and the crowns were located below the cervical line of #37
Patients were excluded in the following cases:1) Patients were not willing to be enrolled in the study.2) Patients with contraindications for tooth extraction.3) Patients did not attend the post-operative follow-up.The data were collected in the Department of Oral Surgery, Hospital of Stomatology, Wuhan University.The new method (NM) group is the “Root Removal First” strategy and the traditional method (TM) group is the “Crown Removal First” strategy. Patients were assigned to each group using a computer-generated randomization list (a computer-generated block randomization technique). An independent clinician generated a random allocation sequence and all participants were kept blinded. The allocation sequence was concealed in sequentially numbered, opaque, and sealed envelopes, which were kept by the research officer. The sealed envelope containing the allocation sequence was opened by the clinician once the informed consent for this research was obtained. Both groups were operated by a single operator.