en تخصصي Special مقالات اصيل Original Article <span style="font-size:11pt"><span style="line-height:150%"><span style="unicode-bidi:embed"><span calibri="" style="font-family:"><span class="a" new="" roman="" style="font-family:" times=""><span style="color:#2e74b5"><span style="font-weight:bold"><span style="font-size:12.0pt"><span style="line-height:150%">Background:</span></span></span></span></span><b> </b><span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Regarding the impact of orthognathic surgery on the airway and voice, this study was carried out to investigate</span></span></span> <span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">the effects of maxillary impaction surgery on patients&#39; voices through acoustic analysis and articulation assessment.</span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:150%"><span style="unicode-bidi:embed"><span calibri="" style="font-family:"><span class="a" new="" roman="" style="font-family:" times=""><span style="color:#2e74b5"><span style="font-weight:bold"><span style="font-size:12.0pt"><span style="line-height:150%">Methods: </span></span></span></span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">This quasi-experimental, before-and-after, double-blind study aimed at examining the effects of maxillary impaction surgery on the voice of orthognathic surgery patients. Before the surgery, a speech therapist conducted acoustic analysis, which included fundament frequency (F0), Jitter, Shimmer, and the harmonic-to-noise ratio (HNR), as well as first, second, and third formants (F1, F2, and F3). The patient&#39;s age, sex, degree of maxillary deformity, and impaction were documented in a checklist. Voice analysis was repeated during follow-up appointments at one and six months after the surgery in a blinded manner. The data were statistically analyzed using SPSS 23, and the significance level was set at 0.05.</span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:150%"><span style="unicode-bidi:embed"><span calibri="" style="font-family:"><span class="a" new="" roman="" style="font-family:" times=""><span style="color:#2e74b5"><span style="font-weight:bold"><span style="font-size:12.0pt"><span style="line-height:150%">Results</span></span></span></span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">: Twenty two patients (18 females, 4 males) were examined, with ages ranging from 18 to 40 years and an average age of 25.54 years. F2, F3, HNR, and Shimmer demonstrated a significant increase over the investigation period compared to the initial phase of the study (<i>P</i> <0.001 for each). Conversely, the Jitter variable exhibited a significant decrease during the follow-up assessments in comparison to the initial phase of the study (<i>P</i>< 0.001).</span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:150%"><span style="unicode-bidi:embed"><span calibri="" style="font-family:"><span class="a" new="" roman="" style="font-family:" times=""><span style="color:#2e74b5"><span style="font-weight:bold"><span style="font-size:12.0pt"><span style="line-height:150%">Conclusion:</span></span></span></span></span><span style="font-size:12.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> Following maxillary impaction surgery, improvements in voice quality were observed compared to the preoperative condition. However, further studies with larger samples are needed to confirm the relevancy.</span></span></span></span></span></span></span><br> &nbsp; Maxillary impaction surgery, Acoustic analysis, Orthognathic surgery 44 56 http://wjps.ir/browse.php?a_code=A-10-466-52&slc_lang=en&sid=1 Hamide Ghaemi 100319475328460015091 100319475328460015091 No Department of Speech Therapy, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran Ricardo Grillo 100319475328460015092 100319475328460015092 No Department of Oral & Maxillofacial Surgery, Traumatology and Prosthesis – Faculty of Dentistry of the University of São Paulo, Brazil Omid Alizadeh 100319475328460015093 100319475328460015093 No Student Research Committee, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran Alireza Shirzadeh 100319475328460015094 100319475328460015094 No Department of Oral & Maxillofacial Surgery, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran Behnoush Ejtehadi 100319475328460015095 100319475328460015095 No Student Research Committee, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran Masoud Torkzadeh 100319475328460015096 100319475328460015096 No Dental Research Center, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran Sahand Samieirad SamieeRadS@mums.ac.ir 100319475328460015097 100319475328460015097 Yes Department of Oral & Maxillofacial Surgery, Mashhad Dental School, Mashhad University of Medical Sciences, Mashhad, Iran