Purpose: Haircutting in the beauty field demands precision and expertise. It serves as a foundational step in shaping hairstyle structure and achieving design completeness. Providing quantified educational resources based on slicing techniques and cranial reference points enables professionals to predict shape line results in advance, improving both accuracy and consistency in haircutting.Methods: Haircuts were performed by applying slicing tilt angles of 0°, 10°, 20°, 30°, 40°, 50°, 60°, and 70°at cranial reference points E.P, E.B.P, N.S.P, and N.P. Parallel and backward diagonal cutting lines were used. Hair length variation was measured at each point, and shape line changes were observed through photographic analysis. A structured survey targeting licensed beauty professionals was conducted to examine the influence of tilt angle and slicing line on shape line suitability, haircut efficiency, and ease of technique. The survey also evaluated perceptions of front–back length differences, slicing line necessity, applicability, and design relevance.Results: A 10°increase in slicing angle resulted in 1–3 cm of hair length variation. Optimal tilt angles for shape lines were 0° (parallel), 30° (U-line), and 70° (V-line). Preferred front–back length differences were 5±1 cm for U-lines and 7±1 cm for V-lines. Professionals cited “achieving desired design outcomes” as the primary reason for using slicing lines, along with positive responses on ease of sectioning, applicability, and shape line satisfaction.Conclusion: Slicing techniques and quantified shape line data enhance predictive accuracy and provide a scientific foundation for high-quality beauty education and haircut design.
Moon et al. (Fri,) studied this question.