Comparison of chamfer and deep chamfer preparation designs on the fracture resistance of zirconia core restorations

Jalalian, E; Rostami, Roghayeh; Atashkar, Berivan

doi:10.5681/joddd.2011.009

Cited by 9 publications

(4 citation statements)

References 15 publications

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“…Los tres modelos con línea de terminación tipo chamfer de 0,6 mm 17 , hombro de 0,5 mm 18 y chamfer profundo de 0,5 mm 19 fueron diseñados con propiedades estructurales como el módulo de elasticidad y el coeficiente de Poisson ( Tabla 1 ). Un mallado fue confeccionado mediante 169 449 nodos para el análisis más minucioso de los modelos ( Figura 1 ).…”

Section: Resultsunclassified

“…El proceso de diseño mediante el software siguió este orden: diseño de un diente con anatomía de una primera molar inferior derecha con raíces mesial y distal de longitud 14 mm; preparación dentaria posterior con la reducción de 2 mm en la superficie oclusal siguiendo la anatomía de cúspides y de los surcos; y reducción uniforme de 1,2 mm en paredes axiales, 1 mm en la cara vestibular y 1 mm en la cara lingual. Las configuraciones marginales o líneas de terminación de cada modelo diseñado tuvieron diferentes medidas compuestas por chamfer de 0,6 mm 17 , hombro de 0,5 mm 18 y chamfer profundo de 0,5 mm 19 .…”

Section: Materiales Y Métodosunclassified

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Compressive stress in three types of finishing lines with lithium disilicate crowns in permanent teeth: finite element analysis

Yanapa Márquez,

Chávez-Méndez

2024

Rev Cient Odontol (Lima)

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Introduction: In oral rehabilitation, the use of ceramic restorations is widely accepted due to its aesthetic capacity to mimic the naturalness of the dental tissue, provide longevity of the material, and present a greater marginal fit compared to crowns with a metal structure. Termination lines are biological preparations whose function is to minimize the cervical opening of the marginal seal. Consequently, analyzing the behavior of restorative materials under compressive forces decreases the risk of fracture and increases the success of the treatment. Objective: To compare the compressive stresses of lithium disilicate crowns with three different finishing lines. Methodology: In silico study of the simulation of a dental preparation on a lower right first molar with chamfer (0.6 mm), shoulder (0.5 mm) and deep chamfer (0.5 mm) finish lines. Using the SolidWorks®️ version 2017 software, the maximum stresses, minimum stresses, and location of the compressive force were collected on the Megapascal (Mpa) measurement scale. Results: The chamfer type termination line (0.6mm) obtained a lower compressive stress compared to the other two shoulder type termination lines (0.5mm) and deep chamfer (0.5mm). Conclusions: It was shown that the chamfer type finishing line (0.6mm) presented a better force distribution, determining greater reliability in the selection of this finishing line with the use of a lithium disilicate crown in a unitary manner.

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Section: Resultsunclassified

Section: Materiales Y Métodosunclassified

Compressive stress in three types of finishing lines with lithium disilicate crowns in permanent teeth: finite element analysis

Yanapa Márquez,

Chávez-Méndez

2024

Rev Cient Odontol (Lima)

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“…Comparing the chamfer and the heavy chamfer finish line, Jalalian et al demonstrated a higher fracture resistance for the heavy chamfer margins than the chamfer margins. The heavy chamfer finish line is recommended for posterior aesthetic restorations since it improves the biomechanical performance of posterior single zirconia crowns [ 25 ]. In an article-type review performed by Camille Haddad and Kathy Azzi, the conclusions showed that the monolithic zirconia crowns with knife-edge margins displayed superior fracture resistance at maximum occlusal forces compared to other types of finish lines [ 21 ].…”

Section: Discussionmentioning

confidence: 99%

Influence of the Operator`s Experience, Working Time, and Working Position on the Quality of the Margin Width: In Vitro Study

Janosi

Cerghizan

Rétyi³

et al. 2023

Medicina

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Background and Objectives: Appropriate tooth preparation is mandatory to obtain a perfect marginal fit of fixed restorations. The heavy chamfer is the most commonly used finish line, especially for minimally invasive tooth preparation. The aim of the study was to compare the width of the finish line obtained during tooth preparation performed by experienced (university lecturers) and inexperienced persons (dental students) in different working times and positions. Materials and Methods: Forty left upper-second molars were prepared on the simulator by each participant, totalizing 160 prepared teeth. A new round-end tapered diamond was used to obtain the 0.5 mm width of the heavy chamfer. The prepared teeth were photographed using a Canon D5300 camera with a macro lens attached to a tripod. The measurements were made with the Image-Pro Insight software selecting the same eight reference points. From these points, perpendicular lines were drawn above the finish line to the axial walls and the distance between the chamfer’s outer edge and the axial wall’s inner edge was measured. GraphPad Instat and NCSS Dowson Edition software were used. The statistical significance was set at p < 0.05. The mean (M) and standard deviation (SD) were calculated. The used tests: one sample t-test, ANOVA test, and Tukey–Kramer Multiple Comparisons Test. Results: Statistically significant differences were obtained according to the experience of the participant, preparation time, patient’s position, and the chamfer width on the prepared tooth different surfaces. Conclusions: Daytime or weeklong tiredness and patient position do not affect the width of the heavy chamfer prepared by experienced and inexperienced persons. The experience and the operator’s working position influence the width of the prepared finish line.

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“…Kongkiatkamon et al performed a comparative analysis of four popular translucent zirconia brands (AmannGirrbach, Cercon HT, Cercon XT, and Vita YZ XT) and concluded that Cercon HT had the best strength qualities and the largest fracture load [ 5 ]. The elastic modulus of the core’s supporting materials influenced its fracture resistance [ 6 ]. Epoxy resin dies have more elastic modulus than brass dies and are dimensionally more stable.…”

Section: Discussionmentioning

confidence: 99%

Comparative Effect of No Finish Line, Heavy Chamfer, and Shoulder Marginal Designs on the Fracture Resistance of Zirconia (Cercon) Ceramic Restoration: An In Vitro Study

Gavara,

Jain,

Gupta

et al. 2023

Cureus

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Background Because all-ceramic crowns are more aesthetic and biocompatible than metal-ceramic crowns, they have grown in popularity among patients and dentists. Poor finish line layout can result in restoration margin fracturing, hence, finish line arrangement is critical to maintaining the restoration’s marginal integrity. The goal of this in-vitro study is to evaluate zirconia’s resistance to fracture (Cercon) ceramic restorations with three marginal designs (no finish line, heavy chamfer, and shoulder). This study is important in contributing to the ongoing debate about the optimal finish line design for zirconia restorations. Methodology Three different finish lines, namely, biologically oriented preparation technique (BOPT) with a marginal width of less than 0.3 mm, heavy chamfer with a marginal width of up to 0.3 mm, and shoulder with a marginal width greater than 0.3 mm, were made on 10 extracted maxillary first premolar tooth to make 30 epoxy resin dies on which zirconia (Cercon) coping was done using CAD/CAM technology, and marginal discrepancies were measured using a three-dimensional scanner. All the copings were affixed to their respective dies using GIC luting cement, and fracture resistance was measured using a digital universal testing machine. Results The Kruskal-Wallis test revealed that the mean fracture resistance was more in the heavy chamfer finish line, followed by the no finish line (BOPT) and the shoulder finish line. No statistically significant difference was seen between the no finish line and the heavy chamfer finish line. There was a significant difference between the heavy chamfer and shoulder finish lines (p = 0.004). Conclusions To increase the biomechanical performance of posterior single zirconia restorations, heavy chamfer margins are indicated.

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Comparison of chamfer and deep chamfer preparation designs on the fracture resistance of zirconia core restorations

Cited by 9 publications

References 15 publications

Compressive stress in three types of finishing lines with lithium disilicate crowns in permanent teeth: finite element analysis

Compressive stress in three types of finishing lines with lithium disilicate crowns in permanent teeth: finite element analysis

Influence of the Operator`s Experience, Working Time, and Working Position on the Quality of the Margin Width: In Vitro Study

Comparative Effect of No Finish Line, Heavy Chamfer, and Shoulder Marginal Designs on the Fracture Resistance of Zirconia (Cercon) Ceramic Restoration: An In Vitro Study

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