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

BOPT, una filosofía que nace analógica pero que debe transformarse en digital
(2022) Abad Coronel, Cristian Gustavo
Actualmente, las nuevas tecnologías son de gran utilidad para ejecutar tratamientos restauradores más precisos utilizando diversos equipamientos de adquisición de imágenes, diseño y fabricación, utilizando modernos materiales. El concepto BOPT es una terapia que tiene como objetivo conseguir una adecuada relación entre el tejido dentario, los tejidos blandos circundantes y la restauración protética. Utilizar la digitalización dentro del desarrollo del concepto BOPT es un reto importante que requiere de un adecuado entendimiento del protocolo clínico y de laboratorio. Este artículo pretende mostrar, mediante la presentación de un caso clínico, un protocolo de tratamiento que incluye la digitalización del protocolo tanto clínico como de laboratorio desde una impresión de la preparación vertical hasta lograr una restauración coronaria con un perfil de adaptación protética individualizado a través de un caso clínico con un periodo de seguimiento de 2 años.
Desmitificando la evidencia científica, hacia su aplicación clínica.
(2018) Abad Coronel, Cristian Gustavo; Reyes Arevalo, Giuseppe Antonio; Bravo Calderón, Manuel Estuardo
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.
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.
Comparative Analysis between 3D-Printed Models Designed with Generic and Dental-Specific Software
(2023) Larriva Loyola, Jaime Alejandro; Abad Coronel, Cristian Gustavo; Pazan Morales, Domenica Patricia; Hidalgo Tamayo, Maria Lorena
With the great demand in the market for new dental software, the need has been seen to carry out a precision study for applications in digital dentistry, for which there is no comparative study, and there is a general ignorance regarding their applications. The purpose of this study was to investigate the accuracy differences between digital impressions obtained using generic G-CAD (general CAD) and D-CAD (CAD dental) software. Today, there is a difference between the design software used in dentistry and these in common use. Thus, it is necessary to make a comparison of precision software for specific and generic dental use. We hypothesized that there is no significant difference between the software for specific and general dental use. Methods: A typodont was digitized with an intraoral scanner and the models obtained were exported in STL format to four different softwares (Autodesk MeshMixer 3.5, Exocad Dental, Blender for dental, and InLAB). The STL files obtained by each software were materialized using a 3D printer. The printed models were scanned and exported in STL files, with which six pairs of groups were formed. The groups were compared using analysis software (3D Geomagic Control X) by superimposing them in the initial alignment order and using the best fit method. Results: There were no significant differences between the four analyzed software types; however, group 4, composed of the combination of D-CAD (Blender– InLAB), obtained the highest average (􀀀0.0324 SD = 0.0456), with a higher accuracy compared to the group with the lowest average (group 5, composed of the combination of the Meshmixer and Blender models), a generic software and a specific software (0.1024 SD = 0.0819). Conclusion: Although no evidence of significant difference was found regarding the accuracy of 3D models produced by G-CAD and D-CAD, combinations of groups where specific dental design software was present showed higher accuracy (precision and trueness). The comparison of the 3D graphics obtained with the superimposition of the digital meshes of the printed models performed with the help of the analysis software using the best fit method, replicating the same five reference points for the six groups formed, evidenced a greater tolerance in the groups using D-CAD.
Fracture Resistance Comparative Analysis of Milled-Derived vs. 3D-Printed CAD/CAM Materials for Single-Unit Restorations
(2023) Abad Coronel, Cristian Gustavo; Bravo, Manuel Estuardo; Tello López, Salome; Cornejo Alava, Ana Emilia
The aim of this study was to evaluate and compare the fracture resistance of a singleunit fixed prosthesis, using a CAD/CAM PMMA material and two printed materials (3DPPa and 3DPPb). A typodont with a specific preparation for a full crown was used; a digital impression was made with a state-of-the-art scanner (PrimeScanTM, Dentsply-SironaTM, New York, NY, USA), and a full coverage restoration was designed using a biogeneric design proposal by means of specific software (InLAB 22.1, Dentsply-Sirona, NY, USA). Sixty crowns were prepared, divided into three groups according to the material: 3DPPa (n = 20), 3DPPb (n = 20), both 3D-printed from the .STL file with a resolution of 50 m, and PMMA (n = 20) milled-derived, which were subjected to a thermocycling process. A universal testing machine (Universal/Tensile Testing Machine, Autograph AGS-X Series) with integrated software (TRAPEZIUM LITE X) equipped with a 20 kN load cell was used to determine the fracture resistance. Significant differences were found by Kruskal–Wallis test and multiple comparisons (p < 0.05) in fracture resistance between materials. The fracture resistance for the PMMA material was higher, and the standard deviation was lower (x = 1427.9; sd = 36.9 N) compared to the 3DPPa (x = 1231; sd = 380.1 N) and 3DPPb (x = 1029.9; sd = 166.46 N) prints. The restorations from the milled-derived group showed higher average fracture resistance than the provisional restorations obtained from the printed groups. However, the results demonstrated that all three materials analyzed in single-unit restorations are capable of withstanding the average masticatory forces.
Restauraciones realizadas mediante un sistema CAD/CAM chairside sobre preparaciones verticales
(2020) Abad Coronel, Cristian Gustavo
Validation of the distance between upper canine gingival margin zenith to ipsilateral lower canine gingival margin zenith as method for determination of the occlusal vertical dimension
(2020) Abad Coronel, Cristian Gustavo; Arindia Torres, Ruben Patricio
Background: The vertical dimension of occlusion (VDO) is one of the most important parameters to consider for diagnosis and treatment planning in a prosthetic rehabilitation. Various methods to determine it have been proposed throughout the scientific literature, without establishing a universally accepted method. Various factors, such as the differences in the biotype and phenotypic characteristics of the patients in certain populations, could generate variations in the measurements obtained. Objective: This study aimed to validate a method of evaluation and determination of VDO in subjects belonging to a particular population. Methods: 142 individuals belonging to an Ecuadorian population with healthy and complete dentition were evaluated. The VDO was recorded by taking a distance from the gingival margin zenith of the upper canine to the gingival margin zenith of the ipsilateral lower canine. Results: The results obtained were consistent among the evaluated subjects, determining an average value of 17 mm corresponding to the VDO. The higher frequency of individuals presented a value of 18 mm, which is in agreement with previous findings. Conclusion: The method replicated in this study could be suggested as a valid reference for determining and evaluating VDO in patients with a normal occlusion, which would serve to diagnose and to plan future comprehensive restorative treatments.
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
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