Developing A Mathematical Formula to Estimate The Occlusal Vertical Dimension.

ÖZGÜN ARAŞTIRMA ORIGINAL RESEARCH Med J SDU / SDÜ Tıp Fak Derg u 2020:27(1):79-84 doi: 10.17343/sdutfd.596669 DEVELOPING A MATHEMATICAL FORMULA TO ESTIMATE OCCLUSAL VERTICAL DIMENSION OKLÜZAL DİKEY BOYUTUN TAHMİNİ İÇİN MATEMATİKSEL BİR FORMÜLÜN GELİŞTİRİLMESİ Nurullah TÜRKER¹, Ulviye Şebnem BÜYÜKKAPLAN¹, Mehmet Mustafa ÖZARSLAN¹, Mutlu ÖZCAN². ¹Akdeniz University, Faculty of Dentistry, Department of Prosthodontics, Antalya, Türkiye. ²University of Zürich, Dental Materials Unit, Center for Dental and Oral Medicine, Clinic for Fixed and Removable Prosthodontics and Dental Materials Science, Zurich, Switzerland. Cite this article as: Türker N, Büyükkaplan UŞ, Özarslan MM, Özcan M. Developing A Mathematical Formula To Estimate Occlusal Vertical Dimension. Med J SDU 2020; 27(1): 79-84. Öz Amaç Bu çalışmanın amacı antropometrik noktalar arasındaki mesafeyi kullanarak oklüzal dikey boyutu yüksek hassasiyetle hesaplayabilen matematiksel bir formülün elde edilmesidir. Sonuç Yüzdeki antropometrik noktalar arasındaki mesafelerin bir kısmı oklüzal dikey boyutla anlamlı bir ilişkiye sahiptir.. Bu mesafelerin uzunluk değerlerinin istatistiksel analizi ile oluşturulan matematiksel bir formül, oklüzal dikey boyutun hesaplanmasında kullanılabilir. Gereç ve Yöntem Çalışmaya yüz kırk sekiz gönüllü (74 erkek, 74 kadın) dahil edildi. Subnasion-Menton ve yüzdeki diğer on altı mesafeyi ölçmek için dijital bir kumpas kullanıldı. Subnasion-Menton mesafesini tahmin etmek için korelasyon ve regresyon analizi yapıldı. Regresyon analizi ile elde edilen verilerle okluzal dikey boyutu açıklayan matematiksel bir formül geliştirildi. Formülün doğruluğu bireylerden elde edilen veriler üzerinde test edildi. Anahtar Kelimeler: Oklüzal dikey boyut, regresyon formula, tam dişsizlik, antropometri. Bulgular Subnasion-Menton mesafesi Tragus-Tragus, Pupil-Pupil, Inner Canthus-Inner Canthus, Extra Chantus-Extra Chantus, Tragus-Chelion, Pupil-Nose Tip, Pupil-Subnasion , Pupil-Chelion, Tragus-Extra Chantus mesafeleri ile anlamlı korelasyon gösterdi. Toplam R2, 0.5926 idi. Elde edilen formül ile katılımcıların SnMe uzaklıklarının hesaplanmasında % 54 doğruluk oranı gözlendi. Subnasion Menton mesafesi, 1 mm hata payıyla % 61, 2,5 mm hata payıyla % 73 oranında doğru olarak hesaplandı. Material and Methods One hundred and forty-eight subjects (74 males, 74 females) were included in the study. A digital calliper was used to measure the Subnasion-Menton (SnMe) and the sixteen other distances on the face. The correlation and regression analysis were performed to predict the SnMe distance. A mathematical formula was developed to explain the occlusal vertical dimension with the data obtained by the regression analysis. The accuracy of the formula was tested on data from individuals. Abstract Objective The aim of this study is to obtain a mathematical formula that can calculate occlusal vertical dimension with high accuracy, using the distance between the anthropometric points. İletişim kurulacak yazar/Corresponding author: Müracaat tarihi/Application Date: 25.07.2019 • Kabul tarihi/Accepted Date: 02.10.2019 Available online at http://dergipark.gov.tr/sdutfd Makaleye http://dergipark.gov.tr/sdutfd web sayfasından ulaşılabilir. t 79 Süleyman Demirel Üniversitesi Tıp Fakültesi Dergisi Estimating Occlusal Vertical Dimension Results Tragus-Tragus, Pupil-Pupil, Inner Canthus-Inner Canthus, Extra Chantus-Extra Chantus, Tragus-Chelion, Pupil-Nose Tip, Pupil-Subnasion , Pupil-Chelion, Tragus-Extra Chantus Vertical distances had a significant correlation with SnMe. The Total R2 was 0.5926. With this formula, 54% accuracy was observed in calculating participants' SnMe distances. The SnMe distance was estimated to be 61% with an error margin of 1 mm and 73% with an error margin of 2.5 mm. Conclusions Some of the distances between the anthropometric points on the face have a significant relation with the occlusal vertical dimension. A mathematical formula, to be generated by the statistical analysis of the length values of these distances, can be used to calculate the occlusal vertical dimension. Introduction demographic data. The research was conducted with full accordance with the World Medical Association Declaration of Helsinki. Vertical dimension which occurs when the teeth in maxilla and mandible are in occlusion is called as occlusal vertical dimension (OVD) (1). Re-obtaining of this distance in individuals who lost their OVD due to tooth loss is one of the most important stages of prosthetic treatment. Several methods were reported for the detection of OVD (2). Additionally, none of these methods are sufficient when they are used separately so OVD determination is achieved via a combination of several techniques (2). Anthropometric methods are also used besides several methods in order to determine OVD. In these methods, OVD determination is achieved via numeric data which are obtained by measuring the distances between several parts of the head. Therefore, the possibility to experimentally verify the result is higher when compared to other methods. There is a number of studies which researched the relation between the distances of anthropometric points and OVD (3-7). Some researchers who studied different populations tried to obtain mathematical formulas which can explain OVD for the entire population (7-10). The relation between anthropometric distances can vary according to the races (11). Distances between soft tissue in face and head are measured via different methods in determination of OVD (3-5,12). Due to the differences in the methods used in obtaining the measurements and the anthropometric points taken into consideration, different results were obtained in the studies related to the subject (2). The aim of this study is to obtain a mathematical formula that can calculate OVD with high accuracy using the distance between anthropometric points. Material and Methods The study has been reviewed by independent reviewers and approved by Akdeniz University Faculty of Medicine Clinical Researches Ethics Committee. All individuals had given a written informed consent for taking their photographs and using them and other t 80 Keywords: Occlusal vertical dimension, regression formula, total edentulism,anthropometrics. The study was conducted in the Akdeniz University Faculty of Dentistry. Individuals with Class I occlusion who had no congenital or acquired defect on their faces and had no tooth loss or dental wear that could cause a loss of vertical dimension were included in the study. All the measurements between the anthropometric points were performed on the photographs taken from the individuals. Recommendations in previous studies were followed in the photo-shooting phase (5,13,14). In the study, a 24.2-megapixel camera and a macro lens with focal length between 90 and 120 mm, 1/50 shutter release speed and f/5 lens opening (Nikon D5200, Tokyo, Japan) were used. White light source (100485 HR S (...truncated)