The Experts below are selected from a list of 726 Experts worldwide ranked by ideXlab platform
Byung Ho Choi - One of the best experts on this subject based on the ideXlab platform.
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a technique for digital impression and Bite Registration for a single edentulous arch
Journal of Prosthodontics, 2019Co-Authors: Yiqin Fang, Jing Huan Fang, Seung Mi Jeong, Byung Ho ChoiAbstract:Few studies have reported the application of digital technology for the process of impression and interocclusal recordings in edentulous patients. This article describes a digitizing system for generating digital edentulous models with a jaw relationship by taking direct digital impressions and a virtual Bite Registration using intraoral digital scanning. A specialized scan retractor was used to make digital impressions of edentulous jaws in patients' mouths using an intraoral scanner. Virtual Bite Registration was obtained with optical scanning of the buccal surfaces of both jaws at the occlusal vertical dimension. The Registration was then used as a reference for aligning both jaws. Digital edentulous models that include the jaw relationship would be clinically beneficial for the fabrication of complete dentures in edentulous patients.
Lukas Kamer - One of the best experts on this subject based on the ideXlab platform.
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virtual Bite Registration using intraoral digital scanning ct and cbct in vitro evaluation of a new method and its implication for orthognathic surgery
Journal of Cranio-maxillofacial Surgery, 2016Co-Authors: Johanna Nilsson, R G Richards, Andreas Thor, Lukas KamerAbstract:Abstract Three-dimensional (3D) computer-assisted planning requires detailed visualisation of the craniomaxillofacial region and interocclusal relationship. The aim of this study was to establish and evaluate a method to create a 3D model of the craniomaxillofacial region and to adopt intraoral digital scanning to place the lower jaw into a centric relation (CR) without the need of additional plaster casts and model surgery. A standard plastic skull modified by metallic dental wires and brackets was subjected to computed tomography (CT), cone beam computed tomography (CBCT), and intraoral digital scanning. We evaluated two different virtual Bite Registrations, a digital scan of the buccal dental surfaces and scanning of the wax Bites to position the lower jaw into a CR, and assessed the accuracy of the integration of intraoral scanning to the CT/CBCT scans. The mean Registration error of corresponding mesh points for the CT and intraoral scanned images was 0.15 ± 0.12 mm, while this error was 0.18 ± 0.13 mm for the CBCT and intraoral scanned images. The mean accuracy of the two virtual Bite Registrations ranged from 0.41 to 0.49 mm (buccal scan technique) and from 0.65 to 1.3 mm (virtualised wax Bite technique). A method for virtual Bite Registration was developed. It has the potential to eliminate plaster casts and model surgery and may facilitate 3D computer-assisted planning of orthognathic surgery cases.
Berna Saglik - One of the best experts on this subject based on the ideXlab platform.
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modified record base featuring postpalatal seal using silicone Bite Registration material
Journal of Prosthodontics, 2011Co-Authors: Berna SaglikAbstract:This article describes a simple method of fabricating a stable and retentive record base to ensure an accurate Registration of the maxillomandibular relationship. A postpalatal seal is established along the posterior end of the record base on the definitive cast using a silicone Bite Registration material to create a border seal along with the lip/cheek draping actions and to evaluate adequacy of the post dam.
Yiqin Fang - One of the best experts on this subject based on the ideXlab platform.
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a technique for digital impression and Bite Registration for a single edentulous arch
Journal of Prosthodontics, 2019Co-Authors: Yiqin Fang, Jing Huan Fang, Seung Mi Jeong, Byung Ho ChoiAbstract:Few studies have reported the application of digital technology for the process of impression and interocclusal recordings in edentulous patients. This article describes a digitizing system for generating digital edentulous models with a jaw relationship by taking direct digital impressions and a virtual Bite Registration using intraoral digital scanning. A specialized scan retractor was used to make digital impressions of edentulous jaws in patients' mouths using an intraoral scanner. Virtual Bite Registration was obtained with optical scanning of the buccal surfaces of both jaws at the occlusal vertical dimension. The Registration was then used as a reference for aligning both jaws. Digital edentulous models that include the jaw relationship would be clinically beneficial for the fabrication of complete dentures in edentulous patients.
Norsiah Yunus - One of the best experts on this subject based on the ideXlab platform.
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evaluation of accuracy of complete arch multiple unit abutment level dental implant impressions using different impression and splinting materials
International Journal of Oral & Maxillofacial Implants, 2013Co-Authors: Muaiyed Mahmoud Buzayan, Mirza Rustum Baig, Norsiah YunusAbstract:PURPOSE: This in vitro study evaluated the accuracy of multiple-unit dental implant casts obtained from splinted or nonsplinted direct impression techniques using various splinting materials by comparing the casts to the reference models. The effect of two different impression materials on the accuracy of the implant casts was also evaluated for abutment-level impressions. MATERIALS AND METHODS: A reference model with six internal-connection implant replicas placed in the completely edentulous mandibular arch and connected to multi-base abutments was fabricated from heat-curing acrylic resin. Forty impressions of the reference model were made, 20 each with polyether (PE) and polyvinylsiloxane (PVS) impression materials using the open tray technique. The PE and PVS groups were further subdivided into four subgroups of five each on the bases of splinting type: no splinting, Bite Registration PE, Bite Registration addition silicone, or autopolymerizing acrylic resin. The positional accuracy of the implant replica heads was measured on the poured casts using a coordinate measuring machine to assess linear differences in interimplant distances in all three axes. The collected data (linear and three-dimensional [3D] displacement values) were compared with the measurements calculated on the reference resin model and analyzed with nonparametric tests (Kruskal-Wallis and Mann-Whitney). RESULTS: No significant differences were found between the various splinting groups for both PE and PVS impression materials in terms of linear and 3D distortions. However, small but significant differences were found between the two impression materials (PVS, 91 μm; PE, 103 μm) in terms of 3D discrepancies, irrespective of the splinting technique employed. CONCLUSIONS: Casts obtained from both impression materials exhiBited differences from the reference model. The impression material influenced impression inaccuracy more than the splinting material for multiple-unit abutment-level impressions.
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evaluation of accuracy of complete arch multiple unit abutment level dental implant impressions using different impression and splinting materials
International Journal of Oral & Maxillofacial Implants, 2013Co-Authors: Muaiyed Mahmoud Buzayan, Mirza Rustum Baig, Norsiah YunusAbstract:Purpose This in vitro study evaluated the accuracy of multiple-unit dental implant casts obtained from splinted or nonsplinted direct impression techniques using various splinting materials by comparing the casts to the reference models. The effect of two different impression materials on the accuracy of the implant casts was also evaluated for abutment-level impressions. Materials and methods A reference model with six internal-connection implant replicas placed in the completely edentulous mandibular arch and connected to multi-base abutments was fabricated from heat-curing acrylic resin. Forty impressions of the reference model were made, 20 each with polyether (PE) and polyvinylsiloxane (PVS) impression materials using the open tray technique. The PE and PVS groups were further subdivided into four subgroups of five each on the bases of splinting type: no splinting, Bite Registration PE, Bite Registration addition silicone, or autopolymerizing acrylic resin. The positional accuracy of the implant replica heads was measured on the poured casts using a coordinate measuring machine to assess linear differences in interimplant distances in all three axes. The collected data (linear and three-dimensional [3D] displacement values) were compared with the measurements calculated on the reference resin model and analyzed with nonparametric tests (Kruskal-Wallis and Mann-Whitney). Results No significant differences were found between the various splinting groups for both PE and PVS impression materials in terms of linear and 3D distortions. However, small but significant differences were found between the two impression materials (PVS, 91 μm; PE, 103 μm) in terms of 3D discrepancies, irrespective of the splinting technique employed. Conclusions Casts obtained from both impression materials exhiBited differences from the reference model. The impression material influenced impression inaccuracy more than the splinting material for multiple-unit abutment-level impressions.