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Abstract
The lip-splitting approach enables excellent access to all areas of the mouth and pharynx to remove tumors; however, traditional lower lip-splitting incisions produce an unsatisfactory scar. To achieve better functional and aesthetic results, we used a Z-shaped incision and compared the functional and aesthetic outcomes of the straight and Z-shaped incisions. Sixty patients who fulfilled the inclusion criteria were randomly divided into two groups and underwent lip-splitting between March 2021 and September 2023. Eventually, 77 patients were reviewed within 6 months and evaluated using the lip function assessment scale, patient and observer scar assessment scale, naïve observer scar assessment scale, and a clinical examination. The Z-shaped incision group performed better in terms of the lip pout movement at 3 months and in the subjective overall opinion, color, irregularity, and pigmentation at 6 months. The Z-shaped incision group had a lower incidence of notched vermilion. In conclusion, Z-shaped lower lip-splitting incisions have better functional and aesthetic outcomes than traditional straight incisions.
Trial registration: Public title: Difference between the effect of Z-shaped and vertical incisions of labiobuccal flap on the recovery of lower lip scars. Registration date: 09/03/2021. Registration number: ChiCTR2100044084. Registry URL: http://www.chictr.org.cn.
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1 Sichuan University, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581); Sichuan University, Department of Head and Neck Oncology, West China Hospital of Stomatology, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581); Tohoku University Graduate School of Dentistry, Division for Globalization Initiative, Sendai, Japan (GRID:grid.69566.3a) (ISNI:0000 0001 2248 6943)
2 Chengdu Sixth People’s Hospital, Chengdu, China (GRID:grid.460068.c) (ISNI:0000 0004 1757 9645); Sichuan University, West China School of Nursing, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581)
3 Sichuan University, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581); Sichuan University, Department of Head and Neck Oncology, West China Hospital of Stomatology, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581)
4 Sichuan University, State Key Laboratory of Oral Diseases & National Center for Stomatology & National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581); Sichuan University, West China School of Nursing, Chengdu, China (GRID:grid.13291.38) (ISNI:0000 0001 0807 1581)
5 Tohoku University Graduate School of Dentistry, Division for Globalization Initiative, Sendai, Japan (GRID:grid.69566.3a) (ISNI:0000 0001 2248 6943)