Person:
Abad Coronel, Cristian Gustavo

Birth Date

1974-11-24

ORCID

0000-0002-5326-681X

Scopus Author ID

57191820951

Afiliación

Universidad de Cuenca, Cuenca, Ecuador
Universidad de Cuenca, Facultad de Odontología, Cuenca, Ecuador

País

Ecuador

Organizational Units

Organizational Unit

Facultad de Odontología

La Facultad de Odontología se estableció en 1958, es la unidad académica responsable de la carrera que lleva el mismo nombre y que desarrolla actividades de docencia, investigación y de servicio comunitario, en modalidad presencial y con duración de 10 ciclos. Las actividades académicas descritas en el plan de carrera y matriz curricular se desempeñan en aulas, laboratorios y clínicas, modernamente equipadas acorde a los avances tecnológicos y a las exigencias de los organismos de control.

Job Title

Profesor (T)

Last Name

Abad Coronel

First Name

Cristian Gustavo

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Now showing 1 - 10 of 28

Desmitificando la evidencia científica, hacia su aplicación clínica.
(2018) Abad Coronel, Cristian Gustavo; Reyes Arevalo, Giuseppe Antonio; Bravo Calderón, Manuel Estuardo
Intraoral scanning devices applied in fixed prosthodontics
(2019) Abad Coronel, Cristian Gustavo; Naranjo Yepez, Marix Belen; Valdiviezo Zhunio, Claudia Pamela
Workflow in fixed prosthesis requires a strict compliance of the exploration, diagnosis and treatment plan processes. Execution of this plan begins with the dental preparations and the impressions to obtain the working models. New technologies to design and machine fixed prosthesis are giving way to a higher frequency of digital impressions through intraoral scanners (IOS). It is expected that the use of these scanners generates an absolute digitalization in the fixed prosthodontics protocol. This review of the literature aims to provide knowledge by collecting the findings of several studies on dental prostheses manufactured from intraoral digital impressions. Likewise, it aims to describe the different IOS systems used; in addition to its advantages and disadvantages over conventional impressions for the manufacture of prosthetic restorations. The results of this review provide data on each of the systems currently available. The possibilities of use in the realization of partial restorations, crowns and bridges are viable using impressions by intraoral scanners.
Resistance to fracture of lithium disilicate feldspathic restorations manufactured using a CAD/CAM system and crystallized with different thermal units and programs
(2021) Abad Coronel, Cristian Gustavo; Ordoñez Balladares, Andrea Dolores; Fajardo Seminario, Jorge Isaac; Martín Biedma, Benjamín José
The aim of this study was to determine the resistance to fracture of feldspathic restorations with lithium disilicate and crystallized with different ovens and programs. Methods: Sixty monolithic restorations (LD) (EMAX CAD™ LT, Ivoclar-Vivadent™) were designed with the same parameters and milled with a CAD/CAM system (CEREC SW 5.1, CEREC MCXL, Dentsply-Sirona™, Bensheim). Each restoration was randomly assigned by randomization software (RANDNUM) to one of the three groups: (a) (NF) Oven P310 (Ivoclar, Vivadent) normal crystallization program, (b) (FF) Ivoclar P310 oven (Ivoclar-Vivadent™) rapid crystallization program, or (c) (SF) SpeedFire oven (DentsplySirona™). Results: There were statistically significant differences between the groups (ANOVA, p < 0.05). The NF and FF groups showed the highest values of resistance to fracture, with statistically significant differences with the SF group. Conclusions: Using a furnace from the same dental company with predetermined programs from the material manufacturer, as well as using a predetermined program for rapid crystallization, has no effect on fracture resistance, and would save clinical time when performing ceramic restorations with lithium disilicate, while keeping their mechanical properties.
Computer-aided design in restorative dentistry
(Springer, Cham, 2019) Abad Coronel, Cristian Gustavo; Tamimi, Faleh; Pradies Ramiro, Guillermo Jesús; Hassan, Bassam; Ferreiroa Navarro, Alberto
As 3D printing, computer-aided machining, and optical scanners keep improving and are becoming more accessible, design software is rapidly becoming the next frontier in digital dentistry. Rapid prototyping technologies in dentistry were initially operated with generic software that was not specifically designed for dental applications. This was very inefficient and a limiting factor for digitalization of dentistry. The arrival of specialized software for different dental applications has made digital dentistry a reality by making it efficient and bringing it to its full potential. This chapter addresses the different types of software that has been developed for restorative dentistry. This includes software for fixed, removable, and implant prosthodontics as well as software for treatment planning
Comparative Fracture Resistance Analysis of Translucent Monolithic Zirconia Dioxide Milled in a CAD/CAM System
(2023) Ulloa Wilches, Ana Liz; Fajardo Seminario, Jorge Isaac; Abad Coronel, Cristian Gustavo; Paladines Diaz, Maria De los angeles; Paltán Zhingre, César Antonio
The aim of this study was to evaluate and compare the fracture resistance of definitive zirconia dioxide restorations obtained using a computer-aided design and manufacturing (CAD/CAM) system. Methods: Two groups of ten samples were analyzed for each material (n: 20); the first group was Zolid Gen X Amann Girrbach (ZGX) and the second group was Cercon HT Dentsply Sirona (CDS). The restorations were designed with identical parameters and milled with a CAD/CAM system. Each specimen was load tested at a speed of 0.5 mm/min, with a direction parallel to the major axis of the tooth and with an initial preload of 10 N until fracture using a universal testing machine (Universal/Tensile Testing Machine, Autograph AGS-X Series) equipped with a 20 kN load cell. The results obtained were recorded in Newtons (N), using software connected to the testing machine. Results: Statistically significant differences were found, and the fracture resistance of the monolithic zirconia crowns was lower in the CDS group (1744.84 172.8 N) compared to the ZGX group (2387.41 516 N). Conclusions: The monolithic zirconia CAD-CAM zirconia crowns showed sufficient fracture resistance when used in posterior molar and premolar zones with either material, as they withstood fracture loads greater than the maximum masticatory force.
Digital Volumetric Analysis of CAD/CAM Polymeric Materials after Tooth Brushing
(2022) Aliaga Sancho, Jenny Paulina; Abad Coronel, Cristian Gustavo; Palomeque, Andrea; Mena Cordova, Nancy Cecilia
The objective of the study was to evaluate the volumetric wear of four composite materials for CAD/CAM (computer-aided design/computer-aided manufacturing) systems. The materials evaluated were: Cerasmart (CER), Shofu Block HC (SBH), Tetric CAD (TEC) and Brava (BRA). All the samples (n = 40) were subjected to simulated brushing (100,000 cycles). Wear was evaluated by superimposing pre-and post-brushing scans obtained with an intraoral optical scanner (CEREC Primescan; Dentsply Sirona, Germany), which were subsequently imported into the OraCheck software 5.0 (Dentsply Sirona, Germany). The data were analyzed by ANOVA test and Tukey’s HSD test was used for multiple comparisons. Cerasmart showed the least wear after brushing. All the tested materials exhibited mass loss.
Evaluation of resin composites for dental restorations
(Elsevier, 2019) Abad Coronel, Cristian Gustavo; Pradíes Ramiro, Guillermo; Ja Y, Pastor; Palacios García, Teresa
In the production of dental restorations, there are, currently, two main types of materials: ceramics and resin composites. These latter kinds are typically suggested because of their quick fabrication, easy reparation and increased crossed link density compared with conventional light-cured materials. However, it is not clear for the specialist what is the best option among the many commercially available materials for each precise clinical case. For that reason, this work aims to clarify the real mechanical performance of resin-based composites for indirect dental restorations obtained by material removal processes and their most suitable application. Two kinds of resin CAD/CAM blocks were selected: LavaTM Ultimate and CerasmartTM, which were tested under two conditions: in the as received by the manufacturer state and after storage in artificial saliva during 30 days. The mechanical properties of both materials were analysed (density, hardness, flexural strength, fracture toughness) but also the influence on the degradation of the mechanical performance due to the contact with the saliva. Results indicate a better mechanical performance of the Lava Ultimate material in the as-received condition, despite its coarser microstructure. However, Cerasmart shows a stabilised microstructure with a smaller degradation of the mechanical properties in contact with the artificial saliva; in other words, improved durability inside the mouth
Comparative analysis of fracture resistance between CAD/CAM materials for interim fixed prosthesis
(2021) Abad Coronel, Cristian Gustavo; Carrera Calahorrano, Elena Alejandra; Mena Cordova, Nancy Cecilia; Fajardo Seminario, Jorge Isaac; Aliaga Sancho, Jenny Paulina
The aim of this study was to evaluate and compare the resistance to fracture of interim restorations obtained through additive techniques (3D impressions) and subtractive techniques (milling) using a computer-aided design and manufacture (CAD/CAM) system of a three-unit fixed dental prosthesis (FDP) to ascertain its clinical importance. (1) Materials and methods: In total, 40 samples were manufactured and divided into two groups (n = 20) using: (1) light-curing micro hybrid resin for temporary crowns and bridges (PriZma 3D Bio Prov, MarketechLabs, São Paulo, Brazil) for the rapid prototyping group (RP) and (2) a polymethylmethacrylate (PMMA) CAD/CAM disc (Vipiblock Trilux, VIPI, São Paulo, Brazil) for the computer-assisted milling (CC). The resistance to fracture was determined with a universal testing machine. (2) Results: The strength and the standard deviation for the computer-assisted milling group were higher (1663.57 ± 130.25 N) than the rapid prototyping (RP) group, which had lower values of (1437.74 ± 73.41 N). (3) Conclusions: The provisional restorations from the computer-assisted milling group showed a greater resistance to fracture than the provisional restorations obtained from the rapid prototyping group.
Analysis of the mesh resolution of an .STL exported from an intraoral scanner file
(2022) Abad Coronel, Cristian Gustavo; Pendola, Martin; Mena Cordova, Nancy Cecilia; Cornejo, Julián; Romero Muñoz, Carla Estefania; Atria, Pablo J; Blatz, Markus
Objectives: This study aimed to provide information on the accuracy of exported digital files with the different resolutions available in the CEREC 4.6.2 software obtained by means of an intraoral scanner (IOS), in addition to establishing differences between materialized models with different exported resolutions, and how these different exported files can influence finite element analysis (FEA) simulations. Materials and Methods: The upper complete arch of 10 patients was scanned through an IOS (CEREC Omnicam 1.0/Dentsply Sirona). Files of three resolution meshes digitalized by a CAD software (Cerec SW, 4.6.2) high, medium and low (IOSH, IOSM, and IOSL) were exported. Each file was evaluated by a software (NETFABB) about the number of triangles obtained and compared with the number announced by the manufacturer. Also, with a superimposition with a specialized software (GEOMAGIC X), the digital models were compared. The files of each resolution were printed (Sprintray 3D Printer), and the printed models were scanned with IOS (Omnicam 1.0) and compared with the control group (intraoral scanned high-resolution file, IOSH). FEA simulations were imported into COMSOL and analyzed under different loading conditions. Results: The number of exported triangles coincided with that reported by the manufacturer. The digital models from files of different resolution did not show significant differences (less than 1.5 um) between each other. Models printed (H, M, L) from files of the same resolution mesh (H, M, L) did not show significant differences between them either in partial measures of the arch and neither in the complete arch. FEA showed significant differences in stress concentration between different exported models. Clinical Significance: Digital models can be exported and printed in three resolutions of the mesh, without differences clinically significative. On the other hand, for future FEA applications further research should be performed in order to determine the optimal number of triangles.
Saliva influence on the mechanical properties of advanced CAD/CAM composites for indirect dental restorations
(2021) Palacios, Teresa; Pastor, José Ygnacio; Abad Coronel, Cristian Gustavo; Tarancón, Sandra
This study aims to evaluate the microstructural and mechanical properties of three commercial resin-based materials available for computer-aid design and manufacturing (CAD/CAM)- processed indirect dental restoration: LavaTM Ultimate Restorative (LU), 3M ESPE; Brilliant Crios (BC), COLTENE and CerasmartTM (CS), GC Dental Product. The three types of resin-based composite CAD/CAM materials were physically and mechanically tested under two conditions: directly as received by the manufacturer (AR) and after storage under immersion in artificial saliva (AS) for 30 days. A global approximation to microstructure and mechanical behaviour was evaluated: density, hardness and nanohardness, nanoelastic modulus, flexural strength, fracture toughness, fracture surfaces, and microstructures and fractography. Moreover, their structural and chemical composition using X-ray fluorescence analysis (XRF) and field emission scanning electron microscopy (FESEM) were investigated. As a result, LU exhibited slightly higher mechanical properties, while the decrease of its mechanical performance after immersion in AS was doubled compared to BC and CS. Tests of pristine material showed 13 GPa elastic modulus, 150 MPa flexural strength, 1.0 MPa·m1/2 fracture toughness, and 1.0 GPa hardness for LU, 11.4 GPa elastic modulus; 140 MPa flexural strength, 1.1 MPa·m1/2 fracture toughness, and 0.8 GPa hardness for BC; and 8.3 GPa elastic modulus, 140 MPa flexural strength, 0.9 MPa·m1/2 fracture toughness, and 0.7 GPa hardness for CS. These values were significantly reduced after one month of immersion in saliva. The interpretation of the mechanical results could suggest, in general, a better behaviour of LU compared with the other two despite it having the coarsest microstructure of the three studied materials. The saliva effect in the three materials was critically relevant for clinical use and must be considered when choosing the best solution for the restoration to be used