Tek Kronlar İçin Farklı İmplant Derinliklerinde Dijital ve Konvansiyonel Ölçülerin Doğruluğunun İn Vitro Değerlendirilmesi

Abstract

Amaç: Bu in vitro çalışmanın amacı, tek implantlı restorasyonlarda implantın dikey konumunun dijital ve konvansiyonel ölçü tekniklerinin doğruluğu üzerindeki etkisini üç boyutlu süperimpozisyon analizleri kullanarak değerlendirmektir. Gereç ve Yöntemler: Mandibular birinci molar bölgesinde yer alan bir implant analogu, üç farklı gingival derinlikte (2 mm, 4 mm, 6 mm) olacak şekilde ana modele yerleştirildi. Dijital ölçüler Trios 3Shape ve Cerec Omnicam tarayıcılarıyla, konvansiyonel ölçüler ise polivinilsiloksan (PVS) ve kondenzasyon tipi silikon (C-silikon) ile alındı. Toplam 96 test modeli (her grup için n=8) oluşturuldu. Tüm modeller dijitalize edilerek referans STL modeliyle karşılaştırıldı ve 3D sapma analizleri Rapidform yazılımı ile gerçekleştirildi. İstatistiksel değerlendirmede Kruskal-Wallis ve Mann-Whitney U testleri kullanıldı (α=0,05). Bulgular: Dijital ölçü grupları arasında anlamlı bir fark saptanmadı (p>0,05). Konvansiyonel yöntemlerde C-silikonla alınan ölçüler, PVS grubuna kıyasla anlamlı derecede daha yüksek sapma gösterdi (p<0,05). Gingival derinlik arttıkça tüm eksenlerde, özellikle 6 mm derinlikte y- ve z-ekseni sapmalarında belirgin artış gözlendi (p<0,05). Sonuç: İmplantın dikey gingival derinliği ölçü doğruluğunu anlamlı düzeyde etkilemektedir. Dijital ölçü teknikleri farklı derinliklerde yüksek doğruluğu korurken, konvansiyonel yöntemler—özellikle C-silikon—daha derin implant konumlarında belirgin doğruluk kaybı göstermektedir.

Keywords

• Dijital ölçü
• konvansiyonel ölçü
• implant derinliği
• doğruluk
• in vitro çalışma

IN VITRO EVALUATION OF ACCURACY OF DIGITAL IMPRESSIONS VERSUS CONVENTİONAL IMPRESSIONS AT VARYING IMPLANT DEPTHS FOR SINGLE CROWNS

Abstract

Objective: This in vitro study aimed to evaluate the effect of implant vertical positioning on the accuracy of digital and conventional impressions for single implants using three-dimensional superimposition analysis. Material and Methods: A master model with a single implant analog (Biohorizons, 5.7 mm) was prepared at three different gingival depths (2 mm, 4 mm, and 6 mm) in the mandibular first molar region. Digital impressions were obtained using two intraoral scanners (Trios 3Shape and Cerec Omnicam), while conventional impressions were taken using polyvinylsiloxane (PVS) and condensation silicone (Type C silicone). In total, 96 test models (n=8 per group) were generated. All models were digitized and compared to the reference STL model using reverse-engineering software (Rapidform) for 3D deviation analysis. Statistical analysis was performed using the Kruskal-Wallis and Mann-Whitney U tests (α=0.05). Results: No statistically significant differences were observed between the digital impression groups (p>0.05). Among conventional techniques, the group using C-silicone showed significantly higher deviations than the PVS group (p<0.05). Increasing gingival depth resulted in significantly greater deviation values in all axes, especially in the y- and z-axes at 6 mm depth (p<0.05). Conclusion: The vertical gingival depth has a significant influence on impression accuracy. Digital techniques maintain higher accuracy across varying depths, whereas conventional techniques, particularly those using C-silicone, exhibit reduced performance at deeper levels.

Keywords

• Digital impression
• conventional impression
• implant depth
• accuracy
• in vitro study

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