Browsing by Author "Mendes, Ana Lia Almeida"
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- Effects of color and special geometric forms on scan speed and trueness of complete arch digital implant scans using Trios 4Publication . Mendes, Ana Lia Almeida; Marques, Tiago Miguel Santos; Fernandes, Danilo; Araújo, Filipe Miguel Soares Framegas deBackground: Intraoral scanners (IOS) are widely used in implant dentistry for capturing digital impressions, offering advantages in accuracy, efficiency, and patient comfort. However, their performance in complete-arch digital implant scanning can be affected by scanbody (SB) design and surface properties. This study aimed to evaluate the effects of SB color and geometry on scan speed and trueness using a intraoral scanner. Materials and methods: A master cast with four angulated implants in an edentulous mandibular model was scanned using five scanbody (SB) configurations. All SBs shared the same cylindrical base design; however, they differed in the presence and design of removable flags. Three prototypes were developed for this study with removable flags of varying shapes and sizes (referred to as “ivory”, “blue”, and “small blue”), one SB had no flag (“metallic”), and one was a commercial scanbody with integrated flags (MedentiWings®, Medentika GmbH, Straumann Group, Hügelsheim, Germany). Each configuration was scanned ten times under controlled laboratory conditions using an intraoral scanner. The resulting standard tessellation language (STL) files were compared to a reference model obtained from a desktop scanner, using three-dimensional (3D) deviation analysis in Geomagic Control X® 2022 (3D Systems Inc, Rock Hill, USA). Trueness was evaluated using the root mean square (RMS) deviation. Scanning time and deviations at specific implant positions were statistically analyzed using analysis of variance (ANOVA) and Tukey’s post hoc tests. Results: The metallic SB achieved the shortest scan time (00:47±00:06) and the highest trueness (RMS: 0.089±0.010). The ivory SB flag showed the highest deviation (RMS: 0.171±0.005) and longest scan time (01:32±00:12). MedentiWings and blue SBs flags showed intermediate performance. A statistically significant positive correlation (p < 0.01) was observed between scanning time and RMS deviation, indicating that longer scanning durations tend to result in reduced trueness. Additionally, deviations were consistently higher in the posterior regions than in the anterior regions, regardless of SB type. Conclusions: SB material, color, and geometry significantly influence scan speed and trueness in full-arch implant digital impressions. Metallic SBs offered the best performance, while bright-colored or geometrically complex designs compromised accuracy and efficiency. Selecting SBs with favorable optical and geometric properties can enhance digital workflow outcomes.