A Retrospective Analysis of the Effectiveness of Fractional <scp>CO</scp>₂ Laser Therapy in Treating Linear Scars: Investigating the Ideal Timing for Intervention
Bibliographic record
Abstract
BACKGROUND: Linear scars, resulting from surgical incisions or traumatic injuries, can pose both aesthetic and functional dilemmas. Ablative fractional CO₂ laser (AFCL) therapy has been recognized for its ability to enhance the appearance and flexibility of scars; however, the ideal timing for such treatments remains a subject of debate. AIMS: This study retrospectively evaluates the effectiveness of AFCL in treating linear atrophic and hypertrophic scars, with a focus on identifying the optimal timing to achieve the best possible outcomes. METHODS: Patients who underwent treatment for linear scars using AFCL at our hospital between January 2022 and July 2024 were included in the study. Participants were categorized into two groups: those with atrophic scars and those with hypertrophic scars. Hypertrophic scars were assessed using the Vancouver Scar Scale (VSS), whereas atrophic scars were evaluated with the Scar Cosmesis Assessment and Rating (SCAR) scale. Furthermore, considering the timing of scar formation-with a six-month period as the threshold-two subgroups were categorized as early treatment and late treatment. The disparities in scar improvement rates were then computed and subjected to analysis. RESULTS: Among 55 patients, 31 had atrophic scars and 24 had hypertrophic scars. AFCL treatment significantly improved clinical scores in both groups. The SCAR score for atrophic scars decreased from 6.50 (SD 1.31) to 4.92 (SD 1.71) (p < 0.001), and the VSS score for hypertrophic scars decreased from 6.02 (SD 0.46) to 2.73 (SD 0.39) (p < 0.001). The early-treatment subgroup showed a 35.38% (SD 24.54%) improvement in atrophic scars, significantly higher than the 12.53% (SD 25.65%) in the late-treatment subgroup (p = 0.018). No significant timing effect was found for hypertrophic scars (p = 0.764). CONCLUSION: AFCL is an effective treatment for linear scars. Early intervention, specifically within the first 6 months, leads to superior outcomes for atrophic scars. In contrast, the timing of treatment is less critical for hypertrophic scars. TRIAL REGISTRATION: Chinese clinical trial registry: Registration no. ChiCTR2400092038.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".