Amaç: Bu çalışmanın amacı, dental alçı modeller üzerinde yapılan manuel ve dijital lineer ölçümleri karşılaştırmak ve bilgisayar destekli 3 boyutlu ölçüm yönteminin etkinliğini göstermektir. Gereç ve Yöntemler: Üzerinde 5 adet prepare edilmiş diş bulunan (sağ-sol I. molarlar, sağ-sol kaninler ve 1 keisici diş) mandibulayı temsil eden ark şeklinde bir ana model, bilgisayar destekli tasarım ile tasarlanmış ve bilgisayar destekli üretim (CAD/CAM) teknolojisi ile CoCr alaşım tozundan üretilmiştir. Ana modelden vinil siloksan eter (VSE) ile ölçü alınmış ve toplamda 10 alçı model elde edilmiştir. Ana model ve çalışma modelleri optik ekstraoral tarayıcı ile dijitalleştirilmiştir. Alçı çalışma modelleri üzerindeki manuel lineer ölçümler (VSE Manuel) dijital kumpas ile dijital modeller üzerindeki lineer ölçümler (VSE Dijital) ise 3 boyutlu (3D) analiz yazılımı ile yapılmıştır. Ayrıca çalışma modelleri üzerinde 3D analizler de yine aynı yazılım ile yapılmış ve renk kodlu haritalar oluşturulmuştur. Tek değişkenli varyans analizi kullanılarak farklılıklar analiz edilmiş ve çoklu karşılaştırmalar için post hoc testleri kullanılmıştır. Bulgular: VSE Manuel ve Dijital grupları arasında istatistiksel olarak anlamlı farklılıklar bulunmuştur (p<.001, p=.001, p=.037, p=.022). Dijital ölçümlerde ana modele göre farklılıklar 0.018-0.146 mm arasında değişirken, manuel ölçümlerde 0.059-0.168 mm çıkmıştır. 3D analizlerde ise çalışma modellerinin hassasiyeti ortalama 0.0142 mm olarak ölçülmüş ve çalışma modelleri ana modele göre daha küçük çıkmıştır. Sonuç: Çalışmamızda 3D analizler ve dijital ölçümler, manuel ölçümlere göre daha hassas sonuçlar vermiş ve bulunan farklar istatistiksel olarak anlamlı çıkmıştır. Çalışma modellerinin değerlendirilmesinde, boyutları bilinen bir ana model ile bilgisayar destekli ölçüm yönteminin, objektif ve standart bir yöntem olarak kullanılabileceği düşünülmektedir. Anahtar Kelimeler: Lineer ölçüm, dijital model, hassasiyet, bilgisayar destekli ölçüm COMPARISON OF MEASUREMENT METHODS TO DETERMINE DIMENSIONAL DIFFERENCES ON DENTAL CASTS ABSTRACT Purpose: The purpose of this study is to compare the linear measurements with the digital measurements on dental casts and to demonstrate the effectiveness of the computer-aided 3-dimensional measurement method. Material and Methods: An arc-shaped master model consisting of 5 prepared teeth (right-left first molars, right-left canines and one incisor) was designed with computer-aided design and fabricated with CoCr alloy powder using computer-aided manufacturing (CAD/CAM) technology. A total of 10 impressions were made with vinyl siloxanether (VSE) impression material from the master model. The master model and definitive casts were digitized with an optical extraoral scanner. Measurements on definitive casts (VSE Manuel) were made with digital micrometer and measurements on digitized casts (VSE Digital) with 3-dimensional (3D) analysis software. In addition, model analyzes were done with the same software and color-coded maps were created. Differences were analyzed using univariate analysis of variance and Tukey HSD post hoc tests were used for multiple comparisons. Results: Statistically significant differences were found between Manuel and Digital groups (p<.001, p=.001, p=.037, p=.022). With digital measurements differences ranged between 0.018-0.146 mm and with manuel measurements differences ranged between 0.059-0.168 mm. According to the 3D analysis, the accuracy of the digital models was 0.0142 mm for average values and definitive casts were smaller than the master model. Conclusion: In this study 3D analysis and digital measurements shows more accurate results than manuel measurements and the differences were statistically significant. In the evaluation of the definitive casts, it is considered that computer aided measurement with a master model with known dimensions can be used as an objective and standard method. Key words: Linear measurement digital model accuracy computer-aided measurement
Purpose: The aim of this study is to compare manual and digital linear measurements made on the dental wire models and to demonstrate the effectiveness of the computer-backed 3D measurement method. Tools and Methods: A main model in the shape of the ark representing the mandibula with 5 prepared teeth (right-left I. molars, right-left crowns and 1 coating teeth), designed with computer-supported design and made from CoCr alloy powder with computer-supported production (CAD/CAM) technology. The main model was measured with vinyl siloxan ethereum (VSE) and a total of 10 wheels model was obtained. The main models and work models are digitized with an optical extraoral scanner. Manual linear measurements (VSE Manual) and linear measurements on digital models (VSE Digital) are made using 3D (3D) analysis software. In addition, 3D analyses on the work models were again done with the same software and maps with color codes were created. Differences were analyzed using one-variant variance analysis and post-master tests were used for multiple comparisons. Results: There were statistically significant differences between the VSE Manual and the Digital Groups (p<.001, p=.001, p=.037, p=.022). In digital measurements, the differences varied between 0.018-0.146 mm according to the main model, while in manual measurements it was 0.059-0.168 mm. In 3D analyses, the sensitivity of the work models is 0. Measured at 0142 mm and the working models were smaller than the main model. In our study, 3D analyses and digital measurements gave more sensitive results than manual measurements, and the differences found were statistically meaningful. In the assessment of the work models, it is considered that the main model known for the sizes and the computer-backed measurement method can be used as an objective and standard method. The purpose of this study is to compare the linear measurements with the digital measurements on dental casts and to demonstrate the effectiveness of the computer-aided 3-dimensional measurement method. Material and Methods: An arc-shaped master model consisting of 5 prepared teeth (right-left first molars, right-left canines and one incisor) was designed with computer-aided design and manufactured with CoCr alloy powder using computer-aided manufacturing (CAD/CAM) technology. A total of 10 impressions were made with vinyl siloxanether (VSE) impression material from the master model. The master model and definitive casts were digitized with an optical extraoral scanner. Measurements on definitive casts (VSE Manuel) were made with digital micrometer and measurements on digitized casts (VSE Digital) with 3-dimensional (3D) analysis software. In addition, model analyzes were done with the same software and color-coded maps were created. Differences were analyzed using univariate analysis of variance and Tukey HSD post hoc tests were used for multiple comparisons. Results: Statistically significant differences were found between Manuel and Digital groups (p<.001, p=.001, p=.037, p=.022). With digital measurements differences ranged between 0.018-0.146 mm and with manual measurements differences ranged between 0.059-0.168 mm. According to the 3D analysis, the accuracy of the digital models was 0.0142 mm for average values and definitive casts were smaller than the master model. Conclusion: In this study; 3D analysis and digital measurements show more accurate results than manual measurements and the differences were statistically significant. In the evaluation of the definitive casts, it is considered that computer aided measurement with a master model with known dimensions can be used as an objective and standard method. Key words: linear measurement ; digital model ; accuracy ; computer-aided measurement
Dergi Türü : Ulusal
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