Subjective Evaluation of the Accuracy of Video Imaging Prediction Following Orthognathic Surgery in Chinese Patients

Chew, Ming Tak; Koh, Chay Hui; Sandham, Andrew; Wong, Hee-Kit

doi:10.1016/j.joms.2007.06.629

Cited by 9 publications

(6 citation statements)

References 13 publications

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“…The determination of an ideal soft to hard tissue ratio is the first condition for making an ideal surgical prediction. Chew et al 12 reported that skeletal Class III patients undergoing bimaxillary orthognathic surgery had much more difficulties than Class II patients. This study aimed to establish the predictive soft to hard tissue ratios that can be used in patients underwent Class III bimaxillary jaw surgery.…”

Section: Discussionmentioning

confidence: 99%

Soft to Hard Tissue Ratios After Bimaxillary Orthognathic Surgery in Class Iii Patients

Demirsoy

Kurt

2022

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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Bu çalışmada, çift çene cerrahisi geçirmiş iskeletsel Sınıf III hastalarda yumuşak doku profilindeki değişiklikleri değerlendirmek ve yumuşak-sert doku takip oranlarını belirleyerek iki boyutlu simülasyon sistemleri için bir formülasyon oluşturmak amaçlanmıştır. Bireyler ve Yöntem: Bu çalışmaya 20 iskeletsel Sınıf III hasta dâhil edilmiştir. Ameliyat öncesi (T0) ve ortodontik tedavi bittikten sonra (T1) sefalometrik değişkenler lateral sefalogramlarda ölçülmüştür. Yöntem hatası, ilk ölçümlerden üç hafta sonra on hastanın ölçümlerinin yeniden tekrarlanmasıyla belirlenmiştir. T0 ve T1 sefalometrik ölçümlerini karşılaştırmak için bağımlı iki örneklem t-testi kullanılmış ve istatistiksel anlamlılık P<0.05 olarak belirlenmiştir. Bulgular: Bireylerin cinsiyet, maksiller ve mandibular hareket açısından homojen dağılım gösterdiği belirlenmiştir. Sagital düzlemde maksilla için yumuşak-sert doku takip oranları; Burun ucu için %23, Subnasale için %45, yumuşak doku A* noktası için %70 ve üst dudak en ön noktası (Ls) için %60 olarak bulunmuştur. Mandibulada sagital düzlemde yumuşak-sert doku takip oranları ise; alt dudak en ön noktası (Li) için %77, yumuşak doku B* noktası için %101, yumuşak doku Pogonion* noktası için %83, yumuşak doku Gnathion* için %81 ve yumuşak doku Menton* noktası için %95 olarak bulunmuştur. Burun ucu alttaki iskelet yapısının hareketinden en az etkilenen anatomik alan olurken (%23), yumuşak doku B noktası (B*) iskeletsel B noktası ile neredeyse eşit oranda hareket eden anatomik nokta olmuştur (%101). Sonuçlar: Maksilladaki yumuşak ve sert doku arasındaki korelasyonun mandibulaya göre daha düşük olduğu ve çift çene ortognatik cerrahi hastalarının yüz profillerindeki belirgin düzelmenin öncelikli sebebinin mandibulanın geriye doğru hareketi ile ilgili olduğu bulunmuştur. Bu çalışma ile çift çene cerrahisi sonrası yumuşak doku değişikliklerini tahmin etmek için formülasyonlar ve yumuşak-sert doku oranları geliştirilmiştir.

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Section: Discussionmentioning

confidence: 99%

Soft to Hard Tissue Ratios After Bimaxillary Orthognathic Surgery in Class Iii Patients

Demirsoy

Kurt

2022

Atatürk Üniversitesi Diş Hekimliği Fakültesi Dergisi

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“…In the literature, soft tissue predictions achieved by traditional methods and computer software were evaluated and concluded that no prediction method could predict each point in such an excellent way for it to be the same as the treatment result. [9][10][11][14][15][16][17][18][19]29,30 To make an ideal prediction of the final appearance and the treatment success, overbite, and overjet degree, the presence or absence of lip seal, contraction, or tension degree in muscles, subcutaneous tissues, skin tissue, and ethnic differences must be taken into account before surgery. 45 According to the findings of our study:…”

Section: Discussionmentioning

confidence: 99%

“…10,11,[14][15][16] The investigation of various skeletal malocclusions in one study may also lead to incorrect results. [15][16][17] Therefore, the cases with the only type of malocclusion (skeletal class III) were included in our study. The type of skeletal malocclusion was determined in the cephalometric analysis performed, and the patients with the angle between hard tissue A, hard tissue Nasion and hard tissue B point angles smaller than 0 degrees were included in the study.…”

Section: Discussionmentioning

confidence: 99%

Accuracy of 3 Soft Tissue Prediction Methods After Double-Jaw Orthognathic Surgery in Class III Patients

Demirsoy¹,

Kurt²

2021

Ann Plast Surg

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Purpose: We aimed to evaluate the accuracy and validity of conventional manual prediction method (CM) and 2-dimensional and 3-dimensional (3D) soft tissue prediction methods for Class III bimaxillary orthognathic surgery patients. Methods: Twenty skeletal Class III patients were included in this study. Soft tissue prediction was achieved with a traditional manual technique, 2-dimensional software (Dolphin Imaging, version 11.5), and 3-dimensional software (SimPlant Master, version 16.0) on preoperative lateral cephalometric radiographs and cone beam computurized tomography (CBCT) images and then compared with postoperative lateral cephalometric radiographs obtained at least 6 months after surgery (mean, 11.5 ± 6.77 months). Forty-eight measurements were done to determine the reliability of the methods. Results: All prediction methods have limited postsurgery prediction accuracy for the subnasal upper lip area. Most of the differences were not more than 3 mm for all study groups, except the 3D software, which predicted the upper lip area to be, on average, 3.08 ± 1.38 mm further back (P < 0.001). Although the conventional method predicted 20 of 48 measurements similar to the final results, the poorest predictions were found at the nasal and labiomental areas (P < 0.001). Twodimensional software predicted 23 of 48 measurements very close to the final results but made significantly different predictions for the nasolabial and labiomental angles, labrale superius point, and the chin area. Conclusions: The 3D method predicted, especially the upper lip area, to be significantly and clinically incorrect, and its soft tissue prediction was insufficient compared with the other 2 methods. The 3D software needs to be updated, especially in evaluating soft tissue A point and upper lip changes after surgery.

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“…32 In addition, patients tend to be less impressed by surgical outcomes than the medical professionals, 33 and corrections of skeletal Class III patients with bimaxillary surgery were rated to be the least accurately predicted. 20 The purpose of this study was to assess the prediction accuracy of a photocephalometric method for Class III adult female patients treated with bimaxillary surgery. The method utilized tracings of cephalograms and photographs to predict changes in the post-surgical profile by manipulating sectioned photographs of facial regions.…”

Section: Discussionmentioning

confidence: 99%

Investigation into the prediction accuracy of photocephalometry for skeletal Class III adult female patients treated with two-jaw surgery

Lin

Lai

Yen

et al. 2012

Journal of Dental Sciences

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Background/purpose: Surgical predictions for skeletal Class III patients have been reported to be the least accurate. Additionally, female patients tend to focus more on improving their facial esthetics. Therefore, this study was aimed at assessing the prediction accuracy of photocephalometry for skeletal Class III adult female patients treated with two-jaw surgery. Materials and methods: A photocephalometric investigation was undertaken to assess the prediction accuracy in a sample of 16 skeletal Class III female patients requiring bimaxillary orthognathic surgery. Tracings of cephalograms and one-to-one predicted photographs were carried out. Selected landmarks were digitized with a user-defined computer program. The prediction accuracy of the facial profile was estimated by evaluating discrepancies in landmark positions between post-surgical cephalograms and pre-planning photographs. Results: Predictions were generally accurate for all horizontal landmark variables and also for the upper lip in the vertical direction. Inaccuracies tended to occur in the vertical direction of the nasal base and lower lip. Mean differences in the predicted nasal base ranged from 1.00e 1.06 mm inferior to the actual position. In the lower lip, predictions tended to place the position as more superior, and mean discrepancies were 1.38 mm (for the lower stomion), 2.38 mm (labrale inferius), and 2.06 mm (inferior labial sulcus). Conclusions: In this study predictions were generally accurate in skeletal Class III adult female patients treated with two-jaw surgery. Compared to surgical outcomes, the predictions tended to locate the nasal base more inferior and the lower lip in a more superior position. Prediction

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Subjective Evaluation of the Accuracy of Video Imaging Prediction Following Orthognathic Surgery in Chinese Patients

Cited by 9 publications

References 13 publications

Soft to Hard Tissue Ratios After Bimaxillary Orthognathic Surgery in Class Iii Patients

Soft to Hard Tissue Ratios After Bimaxillary Orthognathic Surgery in Class Iii Patients

Accuracy of 3 Soft Tissue Prediction Methods After Double-Jaw Orthognathic Surgery in Class III Patients

Investigation into the prediction accuracy of photocephalometry for skeletal Class III adult female patients treated with two-jaw surgery

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