Akan, BurcinErhamza, Turkan Sezen2025-01-212025-01-2120212029-283Xhttps://doi.org/10.5037/jomr.2021.12204https://hdl.handle.net/20.500.12587/24533Objectives: The purpose of this retrospective study was to compare the pre- and post-treatment values of patients treated with monoblock and twin-block appliances with the values of the skeletal Class I individuals. Material and Methods: The initial lateral cephalometric radiographs of the pubertal untreated skeletal class I patients and cephalometric radiographs of 60 (30 monoblock, 30 twin-block) patients before and after the functional treatment were included in the study. Skeletal, dental, and soft tissue measurements were performed by a single researcher using Dolphin Imaging software version 11.95 (Dolphin Imaging, Chatsworth, CA, USA). Paired t-test was used for statistical evaluation and P < 0.05 was considered statistically significant. Results: In both monoblock and twin-block groups, there was a statistically significant increase in the measurements of the lower jaw and the vertical direction values (sella nasion B point (SNB), pogonion nasion perpendicular, Y-axis, sella nasiongonion gnathion, palatal-mandibular angle, anterior facial height, mandibular length P < 0.05); however, in the Twin-block group, the lower jaw was found to be displaced more forward (change for twin-block; SNB = 2.35, Wits appraisal = -4.77). The most measurements of the twin-block treated group were similar to the control group. Conclusions: Both functional appliances have been identified to be useful in achieving treatment targets; however, with twinblock, results closer to ideal values are obtained.eninfo:eu-repo/semantics/openAccessgrowth and development; mandible; orthodontics; retrognathia; treatment outcomeArticle12210.5037/jomr.2021.1220434377381WOS:001077307600004N/A