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Completely digital workflows for the fabrication of implant-supported removable restorations are not yet common in clinical dental practice. The aim of the current case report is to illustrate a reliable and comfortable workflow that reasonably merges conventional and digital workflows for the CAD/CAM‑fabrication of implant-supported overdentures....
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This clinical report describes a mandibular full-arch rehabilitation by means of an implant-supported overdenture on four zirconia implants. A female patient with an edentulous mandibular arch attended our dental clinic seeking a metal-free mandibular restoration. After oral and radiographic evaluation, four one-piece zirconia implants with conical...
Citations
... Implant overdenture bars are traditionally fabricated by casting methods, which are time-consuming and need many laboratory steps. Recently, the bar framework can be made by CAD/CAM technology [9,10]. CAD/CAM technology has enabled highquality dental restorations in less time, improving efficacy, and providing new materials for dental prostheses [2,11,12]. ...
Aim:
To compare the BioHPP (biocompatible high-performance polymer) as a substructure for the hybrid prosthesis versus the BioHPP bar supporting and retaining implant overdenture by radiographic evaluation to identify bone height alteration around the implants and to evaluate satisfaction based on visual analoge scale questionnaire.
Materials and methods:
Ill-fitting mandibular dentures were chosen for 14 fully edentulous male patients with adequate dental hygiene, enough interarch space, and free of systemic diseases and parafunctional habits. Patients who received new dentures (CDs) were randomly allocated into each group using computer software, and four interforaminal implants were inserted in parallel using a surgical guide. Three months after osseointegration, the patients received either CAD-CAM BioHPP framework hybrid prosthesis (Group I) or BioHPP bar supported and retained overdenture (Group II). Using digital preapical radiography, the bone loss is evaluated 6, 12, and 18 months after insertion. The subjective patient evaluation was done using a questionnaire based on the VAS includes five points for chewing, comfort, esthetics, speech, oral hygiene, and general satisfaction.
Results:
The overall marginal bone loss (MBL) revealed that Group I (hybrid prosthesis) was more than Group II (bar overdenture) at all intervals in the anterior and posterior implants' mesial and distal surfaces. The patient satisfaction survey results showed that, after 18 months, the difference was statistically not significant between them all (P > 0.05) except for the comfort (for the overdenture group, 4.43 ± 0.53 while the fixed hybrid was 5.00 ± 0.00).
Conclusion:
BioHPP framework material is an alternative material for implant rehabilitation of edentulous mandible with minimal MBL in BioHPP bar overdenture compared to BioHPP hybrid prosthesis.
... Un flujo de trabajo mixto permite solucionar este problema a través del escaneado digital de la impresión funcional convencional o de los modelos de yeso obtenidos. También se ha sugerido la impresión 3D de enfilados de prueba en resina económica cuando se requiera evaluar el impacto de la futura prótesis en los tejidos blandos (27). ...
Digital technologies are taking a predominant position in implant dentistry today, both in the planning and in the execution of the surgical and prosthetic phases. For this purpose, patient selection is fundamental and a comprehensive evaluation should be carried out, including a correct anamnesis, clinical and functional examination, photographic records and, at a local level, identification of the anatomical characteristics of the edentulous ridges. The case report presents a female patient, 42 years old, with no relevant medical-surgical history, who attended the Oral Implantology Clinic of the Dental Specialties Service of the Barros Luco Hospital. A workflow is performed with digital technology elements, for the treatment of a complete edentulous patient, by means of a conventional maxillary complete removable denture and a implant-retained mucosa-supported overdenture, focusing on the surgical phase of mandibular implants placement.
... CAD/CAM technology in IROD and ISOD fabrication can reduce treatment times significantly for patients. More development is needed in CAD/CAM technology as intraoral scanners are unable to digitalize the various tissues in the oral cavity as well as the functional movements of the patient (11,12). The use of implants is especially beneficial for patients due to their aesthetics, better quality of life, and improved denture retention. ...
... Overdentures are one of the recognized methods of prosthetic treatment of the mandible. Relatively reasonable costs and uncomplicated clinical management with a significant improvement in retention and stabilization make this type of restoration an attractive treatment option for both patients and dentists [1][2][3]. Precision elements, such as bars, ball or locator clips, telescopic crowns, and magnets [4][5][6][7], limit denture mobility both vertically and horizontally. Precision attachments used with implant-retained overdenture counteract free rotation, so a greater occlusal force may be exerted because of the perceived better denture stability. ...
This paper aims to compare, in vitro, the biomechanical properties of an overdenture retained by two bar-retained implants and an overdenture retained by two bar-retained implants with ball attachments. An edentulous mandible model was prepared for the study based on the FRASACO mold with two implants. In the first system, the “rider” type (PRECI-HORIX, CEKA) retention structure and the complete mandibular denture with the matrix were made. In the second system, the “rider” type retention suprastructure was also used. In the distal part, (CEKA) clips were placed symmetrically, and a complete mandibular denture, together with the matrix on the bar, and the clip patrices were made. A numerical model was developed for each system where all elements were positioned and related to geometric relations, as in reality. The FEA analysis (finite element analysis) was carried out for seven types of loads: with vertical forces of 20, 50, and 100 N and oblique forces of 20 and 50 N acting on individual teeth of the denture, namely central incisor, canine, and first molar. Displacements, stresses, and deformations within the systems were investigated. Maximum denture displacement in the first system was 0.7 mm. Maximum bar stress amounted to 27.528 MPa, and implant stress to 23.16 MPa. Maximum denture displacement in the second system was 0.6 mm. Maximum bar stress amounted to 578.6 MPa, that of clips was 136.99 MPa, and that of implants was 51.418 MPa. Clips cause smaller displacement of the overdenture when it is loaded but generate higher stress within the precision elements and implants compared to a denture retained only by a bar. Regardless of the shape of the precision element, small deformations occur that mainly affect the mucosa and the matrix.
Additive manufacturing (AM) technologies build physical three‐dimensional (3D) geometries by a consecutive layer‐by‐layer addition of material. AM technologies can also produce 3D structures that can actively change their properties under environmental influences. When using subtractive or additive fabricating methods or computer‐aided design (CAD) and computer‐aided manufacturing procedures, the manufacturing workflow of a dental device starts with its virtual design, normally obtained using a dental or non‐dental CAD software program. In dentistry, vat‐polymerization, material jetting technologies, and material extrusion have been frequently used to process polymers and fabricate dental devices, such as dental casts, custom trays, silicone indexes, positioning guides for custom abutments, tooth preparation guides, interim dental restorations, removable prostheses, occlusal devices, and surgical guides. Powder bed fusion technologies are the most frequent metal AM technology used to manufacture cobalt–chromium and titanium frameworks in restorative dentistry.
Computer-aided design and computer-aided manufacturing (CAD/CAM) have become a significant part of modern dentistry as a diagnostic and treatment planning tool and a means to fabricate various dental prosthetics. In recent years, key advancements and increased market competition have led to this technology becoming more affordable than ever before. The purpose of this chapter is to guide dental professionals on the use of dental CAD/CAM, its present state, and possible future outcomes. The focus is on the computer-aided design workflow and everything it entails: acquisition, design of dental prosthetics and various auxiliary appliances, and manufacturing of these designs. There will also be a discussion about the advantages and limitations of digital dentistry and digital dental technology.Readers will learn about basic categorizations and types of dental CAD software, file formats, and common dental designing software (exocad, 3Shape, CEREC software, and inLab). Nowadays, specialized programs and software modules are used in many dental disciplines, such as restorative dentistry, implantology, orthodontics, prosthodontics, and maxillofacial surgery. This chapter will further describe how computer-generated designs and prosthetics can be manufactured either chairside in a dental office or a laboratory.KeywordsDental CAD/CAMDental CAD softwareDental technologyDigital dentistryDental designCAD/CAM workflowChairside CAD/CAMLaboratory CAD/CAMIntraoral scanner
