Digital modeling technology for full dental crown tooth preparation

Dai, Ning; Zhong, Yicheng; Líu, Hao; Yuan, Fusong; Sun, Yuchun

doi:10.1016/j.compbiomed.2016.02.008

Cited by 7 publications

(7 citation statements)

References 17 publications

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“…Las preparaciones dentarias y las líneas de terminación son consideradas como factores importantes que afectan la longevidad clínica de la corona, (13)(14)(15)(16)(17)(18)(19)(20)(21) contrariamente en este estudio, los estudiantes tuvieron dificultad para cumplir con las recomendaciones de preparación para coronas, no se observaron correctos diseños morfológicos, no se lograron ángulos de convergencia ideales ni correctos diseños de la línea de terminación, se detectó presencia de socavados en las paredes axiales de la preparación, en tal virtud, la longevidad de las prótesis fijas también sería afectada.…”

Section: Discussionunclassified

Ángulos de convergencia en preparaciones dentarias realizadas en tipodontos por estudiantes de Odontología, Unach

Colcha¹,

Velastegui

Vaca

2020

EUGENIO ESPEJO

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El objetivo de esta investigación fue analizar los ángulos de convergencia en preparaciones dentarias para coronas realizadas en tipodontos, por estudiantes de décimo semestre de Odontología Unach. Las preparaciones dentales para coronas poseen características de retención y resistencia, principios fundamentales que ofrecen éxito y longevidad de la corona definitiva. Varios investigadores a nivel mundial han desarrollado diversos métodos para evaluar los ángulos de convergencia de las preparaciones extracoronarias; sin embargo, en nuestro medio, no existen estudios acerca de la medición de estos ángulos. Esta investigación fue de carácter experimental, transversal y observacional, se obtuvieron 32 preparaciones dentarias para coronas de recubrimiento completo, cada estudiante tuvo 60 minutos para tallar dos preparaciones dentarias en simuladores clínicos. Los tipodontos fueron escaneados y digitalizados mediante el escáner CAD-CAM Ceramill Database versión 1.0 año 2010 del Laboratorio “BrothersDent” para producir imágenes tridimensionales. El software iTero midió los ángulos vestíbulo-lingual (VL) y mesio-distal (MD) de cada preparación. Los ángulos más pequeño y más grande observados fueron 3.1° y 102.5° para molares mandibulares. El promedio del ángulo VL para dientes anteriores fue 40,38 ±4,38° en varones y 36,97 ±3,95° en mujeres y el promedio del ángulo MD fue 44,68 ±5,51° en varones y 40,08 ±3,99° en mujeres. Para dientes posteriores el promedio VL fue 27,46 ±7,82° en varones y 40,98 ±4,63° en mujeres; y el promedio del ángulo MD fue 40,73 ±5,95° en varones y 50,62 ±7,00° en mujeres. En conclusión, los ángulos de convergencia logrados por estudiantes fueron mayores que los ideales recomendados según Shillingburg.

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Section: Discussionunclassified

Ángulos de convergencia en preparaciones dentarias realizadas en tipodontos por estudiantes de Odontología, Unach

Colcha¹,

Velastegui

Vaca

2020

EUGENIO ESPEJO

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“…This increase followed technological advances in intraoral scanners’ precision, handling, ease of use, compatibility, and interconnectivity with commonly used dental design software such as ExoCAD (ExoCAD Int., San Jose, CA, USA), Trios 3Shape (Trios, Denmark), and InLine (Dentsply-Sirona Co., Charlotte, NC, USA). Clinical implementation of new technologies calls for modifications and optimizations of clinical and technical protocols [ 10 , 11 ]. Within technical protocols are also those dealing with the production of dental prosthodontic appliances regarding input material quality and characteristics, input material handling protocols, production specifics, and output quality control with final standardized products regarding mechanical and biochemical properties, biopotentials, cytological dynamics, and forensic aspects [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Additively Manufactured Commercial Co-Cr Dental Alloys: Comparison of Microstructure and Mechanical Properties

et al. 2021

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Laser-powder bed fusion (LPBF) is one of the preferred techniques for producing Co-Cr metal structures for dental prosthodontic appliances. However, there is generally insufficient information about material properties related to the production process and parameters. This study was conducted on samples produced from three different commercially available Co-Cr dental alloys produced on three different LPBF machines. Identically prepared samples were used for tensile, three-point bending, and toughness tests. Light microscopy (LM), scanning electron microscopy (SEM), and electron backscatter diffraction (EBSD) analyses of microstructure were performed after testing. Differences were observed in microstructures, which reflected statistically significant differences in mechanical properties (one-way analysis of variance (ANOVA) and Scheffé post hoc test (α = 0.05)). The material produced on the 3D Systems DMP Dental 100 had 24 times greater elongation ε than the material produced on the Sysma MySint 100 device and the EOS M100 machine. On the other hand, the material produced on the EOS M100 had significantly higher hardness (HV0.2) than the other two produced materials. However, the microstructure of the Sysma specimens with its morphology deviates considerably from the studied group. LPBF-prepared Co-Cr dental alloys demonstrated significant differences in their microstructures and, consequently, mechanical properties.

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“…parameters, which can reach 2 mm and have a certain fault tolerance [7]. Unlike complete coronal restoration, veneer preparation preserves the original tooth body as much as possible, the preparation morphology is more personalized, and the requirements for preparation parameters are stricter than coronal restoration.…”

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confidence: 99%

“…It is impossible to quantify and visualize the morphology of the target tooth, so it is not easy to accurately design the preparation. A large number of repetitive micro-adjustments of the target tooth need to be performed in combination with manual operations, and it is difficult to avoid visual deviations of the human eyes and manual positioning control errors, making it difficult for the precision of the preparation to meet individualized expected restorative results and manual operation is inefficient [7]. Therefore, there is an urgent need to adopt digital and automated technologies in oral prosthetics to ensure the precise design and processing quality of tooth preparations.…”

mentioning

confidence: 99%

“…Therefore, in preparation design, [10] designed marginal, occlusal, and axial preparation areas for complete crown restorations of first molars based on Geomagic and Imageware software to assist in trajectory planning of dental preparations. [7] used a semi-automatic interactive approach to design marginal lines for dental preparations to achieve feature parameter-based modeling of complete crown preparations. This system quickly and accurately enabled individualized design of parameters such as shoulder width and convergence angle.…”

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confidence: 99%

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Digital Interactive Design and Robot-Assisted Preparation Experiment of Tooth Veneer Preparation: An in Vitro Proof-of-Concept

et al. 2023

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In the fixed prosthesis process dental prosthesis treatment, the dentist needs to conceive the morphology of the tooth preparation and make numerous micro-adjustments by manual operation. This study aims to establish a digital design system for accurate designing of veneer preparation and study the trajectory planning of the robot-assisted preparation. According to the standard operation requirements, the projection line segmentation method based on point drawing is proposed for interactive selection to ensure the margin smoothness of the preparation area. The preparation depth is parameterized, and the foldback point correction method based on secondary segmentation is used for repairing the offset preparation area to ensure surface smoothness. The fenestration preparation model was obtained in the digital interactive design software. The model is divided into two feature areas which are interpolated by the B-spline curve and NURBS surface, respectively. The isoparametric curve method is used to plan the preparation trajectory. The experimental and theoretical values of the target feature points from the X, Y and Z coordinate directions were also calculated and analyzed. The experiment is carried out by the physical prototype of the tooth preparation robot. The maximum error of the feature points on the preparation are 0.180 mm, 0.104 mm and 0.142 mm in X, Y and Z directions, respectively. The confidence interval of the system error is stable within 0.30 mm. The error of the feature points verifies the feasibility of the digital interactive design system and the correctness of the trajectory planning of tooth veneer preparation. The system could have the potential to assist dentists in the precise design of the veneer preparation, improve the processing efficiency and ensure the effect of tooth veneer prosthesis.

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Digital modeling technology for full dental crown tooth preparation

Cited by 7 publications

References 17 publications

Ángulos de convergencia en preparaciones dentarias realizadas en tipodontos por estudiantes de Odontología, Unach

Ángulos de convergencia en preparaciones dentarias realizadas en tipodontos por estudiantes de Odontología, Unach

Additively Manufactured Commercial Co-Cr Dental Alloys: Comparison of Microstructure and Mechanical Properties

Digital Interactive Design and Robot-Assisted Preparation Experiment of Tooth Veneer Preparation: An in Vitro Proof-of-Concept

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