Comparison of marginal and internal fit of 3-unit monolithic zirconia fixed partial dentures fabricated from solid working casts and working casts from a removable die system
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Purpose: This study aimed to assess the marginal and internal fit of 3-unit monolithic zirconia fixed partial dentures (FPDs) fabricated via computer-aided design and computer-aided manufacturing (CAD/CAM) from solid working casts and removable die system. Materials and Methods: The tooth preparation protocol for a zirconia crown was executed on the mandibular right first premolar and mandibular right first molar, with the creation of a reference cast featuring an absent mandibular right second premolar. The reference cast was duplicated using polyvinyl siloxane impression, from which 20 working casts were fabricated following typical dental laboratory procedures. For comparative analysis, 10 FPDs were produced from a removable die system (RD group) and the remaining 10 FPDs from the solid working casts (S group). The casts were digitized using a dental desktop scanner to establish virtual casts and design the FPDs using CAD. The definitive 3-unit monolithic zirconia FPDs were fabricated via a CAM milling process. The seated FPDs on the reference cast underwent digital evaluation for marginal and internal fit. The Mann-Whitney U test was applied for statistical comparison between the two groups (α = 0.05). Results: The RD group showed significantly higher discrepancies in fit for both premolars and molars compared to the S group (P < 0.05), particularly in terms of marginal and occlusal gaps. Color mapping also highlighted more significant deviations in the RD group, especially in the marginal and occlusal regions. Conclusion: The study found that the discrepancies in marginal and occlusal fits of 3-unit monolithic zirconia FPDs were primarily associated with those fabricated using the removable die system. This indicates the significant impact of the fabrication method on the accuracy of FPDs.
Abstract
Purpose: This study aimed to assess the marginal and internal fit of 3-unit monolithic zirconia fixed partial dentures (FPDs) fabricated via computer-aided design and computer-aided manufacturing (CAD/CAM) from solid working casts and removable die system. Materials and Methods: The tooth preparation protocol for a zirconia crown was executed on the mandibular right first premolar and mandibular right first molar, with the creation of a reference cast featuring an absent mandibular right second premolar. The reference cast was duplicated using polyvinyl siloxane impression, from which 20 working casts were fabricated following typical dental laboratory procedures. For comparative analysis, 10 FPDs were produced from a removable die system (RD group) and the remaining 10 FPDs from the solid working casts (S group). The casts were digitized using a dental desktop scanner to establish virtual casts and design the FPDs using CAD. The definitive 3-unit monolithic zirconia FPDs were fabricated via a CAM milling process. The seated FPDs on the reference cast underwent digital evaluation for marginal and internal fit. The Mann-Whitney U test was applied for statistical comparison between the two groups (α = 0.05). Results: The RD group showed significantly higher discrepancies in fit for both premolars and molars compared to the S group (P < 0.05), particularly in terms of marginal and occlusal gaps. Color mapping also highlighted more significant deviations in the RD group, especially in the marginal and occlusal regions. Conclusion: The study found that the discrepancies in marginal and occlusal fits of 3-unit monolithic zirconia FPDs were primarily associated with those fabricated using the removable die system. This indicates the significant impact of the fabrication method on the accuracy of FPDs.
참고문헌 (25)
- Pereira ALC, "Accuracy of CAD-CAM systems for removable partial denture framework fabrication : A systematic review", J Prosthet Dent, 125, pp.241~248 (2021)
- Lee YS, "A comparative study of the accuracy of dental CAD programs in designing a fixed partial denture", J Prosthodont, 31, pp.215~220 (2022)
- Kim SH, "Effects of thermal and mechanical cycling on the mechanical strength and surface properties of dental CAD-CAM restorative materials", J Prosthet Dent, 128, pp.79~88 (2022)
- Parize H, "Digital versus conventional workflow for the fabrication of physical casts for fixed prosthodontics : A systematic review of accuracy", J Prosthet Dent, 128, pp.25~32 (2022)
- Takaichi A, "A systematic review of digital removable partial dentures. Part II : CAD", CAM framework, artificial teeth, and denture base, 2022, pp.66, 53~67
- Revilla-León M, "A guide for maximizing the accuracy of intraoral digital scans : Part 2-Patient factors", J Esthet Restor Dent, 35, pp.241~249 (2023)
- Baghani MT, "In vitro evaluation of the accuracy and precision of intraoral and extraoral complete-arch scans", J Prosthet Dent, 126, pp.665~670 (2021)
- Huang MY, "Effect of distance between the abutment and the adjacent teeth on intraoral scanning : An in vitro study", J Prosthet Dent, 125, pp.911~917 (2021)
- Son K, "Effect of finish line locations of tooth preparation on the accuracy of intraoral scanners", Int J Comput Dent, 24, pp.29~40 (2021)
- Chen Y, "Influence of liquid on the tooth surface on the accuracy of intraoral scanners : an in vitro study", J Prosthodont, 31, pp.59~64 (2022)
- Rekow ED, "Digital dentistry : The new state of the art-Is it disruptive or destructive?", Dent Mater, 36, pp.9~24 (2020)
- AlRumaih HS, "Clinical applications of intraoral scanning in removable prosthodontics : a literature review", J Prosthodont, 30, pp.747~762 (2021)
- Yilmaz B, "Effect of printing layer thickness on the trueness and fit of additively manufactured removable dies", J Prosthet Dent, 128, pp.1318~ (2022)
- Azpiazu-Flores FX, "Positional trueness of three removable die designs with different root geometries manufactured using stereolithographic 3D printing", J Prosthet Dent, pp.S0022-3913(23)00606-6~ (2023)
- Yu BY, "Effect of abutment superimposition process of dental model scanner on final virtual model", J Korean Acad Prosthodont, 57, pp.203~210 (2019)
- Conrad HJ, "Current ceramic materials and systems with clinical recommendations : a systematic review", J Prosthet Dent, 98, pp.389~404 (2007)
- Ceylan G, "Evaluating the accuracy of CAD", CAM optimized stones compared to conventional type IV stones, 2023, pp.18, e0282509~
- Sivakumar I, "A comparison of the accuracy of three removable die systems and two die materials", Eur J Prosthodont Restor Dent, 21, pp.115~119 (2013)
- Serrano JG, "An accuracy evaluation of four removable die systems", J Prosthet Dent, 80, pp.575~586 (1998)
- Covo LM, "Accuracy and comparative stability of three removable die systems", J Prosthet Dent, 59, pp.314~318 (1988)
- Hoffman M, "Interproximal distance analysis of stereolithographic casts made by CAD-CAM technology : An in vitro study", J Prosthet Dent, 118, pp.624~630 (2017)
- Loetzerich JM, "Verification of a digital approach for three-dimensional evaluation of marginal and internal fit", J Prosthet Dent, pp.S0022-3913(23)00618-2~ (2023)
- Holst S, "A new triple-scan protocol for 3D fit assessment of dental restorations", Quintessence Int, 42, pp.651~657 (2011)
- Dahl BE, "Internal fit of single crowns produced by CAD-CAM and lost-wax metal casting technique assessed by the triple-scan protocol", J Prosthet Dent, 117, pp.400~404 (2017)
- Park JM, "Digital technique for in vivo assessment of internal and marginal fit of fixed dental prostheses", J Prosthet Dent, 118, pp.452~454 (2017)