The effect of preparation taper on the retention of cemented cast crowns under lateral fatigue loading

Cameron, Stephen M.; Morris, W. Jack; Keesee, Stephen M.; Barsky, Todd B.; Parker, M. Harry

doi:10.1016/j.prosdent.2006.03.021

Cited by 36 publications

(34 citation statements)

References 13 publications

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“…However, Palacios et al used prepared human teeth with a relative small taper of 10° which can boost the mechanical retention of the crowns. This mechanical retention can specially improve the retention of the conventional luting agents [83][84][85], which explains the difference of the current study.…”

Section: Influence Of the Luting Cement On Crown Retentionmentioning

confidence: 77%

“…However, Derand et al performed their experiment with air-abraded roughened steel dies with a surface area of 112 mm 2 , which will provide very high mechanical retention. This mechanical retention can specially improve the retention of conventional luting agents (zinc phosphate cement) [83][84][85]. Also, the pressure used for air-abrasion of zirconia was relatively high (5 bar) compared to the pressure used in the present study (2.5 bar).…”

Section: Influence Of Air-abrasion On Crown Retentionmentioning

confidence: 79%

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Effect of air-abrasion on the retention of zirconia ceramic crowns luted with different cements before and after artificial aging

Shahin

Kern

2010

Dental Materials

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Section: Influence Of the Luting Cement On Crown Retentionmentioning

confidence: 77%

Section: Influence Of Air-abrasion On Crown Retentionmentioning

confidence: 79%

Effect of air-abrasion on the retention of zirconia ceramic crowns luted with different cements before and after artificial aging

Shahin

Kern

2010

Dental Materials

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“…5,7,[13][14][15][16][17][18][19] In the era of digital diagnostic aids, digital imaging, and computer-aided design (CAD)/ computer-aided manufacturing (CAM)-based restorative treatments, the study on resistance and retention form based on measurements on digital impressions of clinical tooth preparations, to best of our knowledge, have very rarely been undertaken. Apart from that, the study also utilized two methods simultaneously to assess the resistance and retention form to provide an unbiased result.…”

Section: Discussionmentioning

confidence: 99%

“…Retention and resistance forms are the characteristics of a preparation that prevent castings from becoming uncemented, debonded, or cement failures, which are one of the top three reasons for the replacement of castings. 13,14 Tier et al's 12 study on dislodged crowns and retainers revealed that there was a fundamental relation between clinical success or failure and the all-or-none nature of resistance form. They proved dislodged crowns came almost exclusively from preparations with tapers that did not provide resistance form and over 95% of all castings that failed by becoming uncemented lacked resistance form.…”

Section: 5005/jp-journals-10024-2228mentioning

confidence: 99%

Assessment of Retention and Resistance Form of Tooth Preparations for All Ceramic Restorations using Digital Imaging Technique

Muruppel

Thomas

Saratchandran

et al. 2018

The Journal of Contemporary Dental Practice

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Aim: This in vitro study evaluated the resistance form of die preparations for all ceramic restorations and, thereby, explored the concept of effective taper and its correlation between the ideal in theory and actual in the clinical situation by analyzing the digital images of the die preparations. Materials and methods:Scanned digital images of 114 die preparations for all ceramic restorations (n = 114) were collected from a dental laboratory. All the images were also analyzed digitally using Adobe Photoshop ® software to analyze the degree of taper (angle of convergence) of each preparation and then applied the Zuckerman's circle, and the Lewis perpendicular methods were used to measure the resistance form.Results: For the current study, the overall average degree of taper was found to be 20.9° (range, 2-80°), which is more than what is recommended by most previous studies and also sharply greater than the textbook ideal of 3 to 6°. Mean degree of taper for maxillary was 17.56° (anterior-10.50°, posterior-23.7°), and for mandibular teeth, it was 25.22° (anterior-15°, posterior-28.45°). Out of the 64 analyzed images of maxillary teeth, 61 presented resistance form, while 3 were without it. Out of the 50 mandibular teeth analyzed, 38 possessed resistance form, whereas 12 were without. All the anterior teeth showed resistance form irrespective of the arch. Conclusion:The degree of taper showed a significant relationship with resistance and retention form, which was inversely Thodupuzha, Kerala India, e-mail: abhinavjoyce@gmail.com proportional to each other. The recommended "degree of taper" is not always the clinically achievable as advocated in textbooks, as it is modified by various factors in the actual clinical situation. Assessment of Retention and Resistance Form of Tooth Preparations for All Ceramic Restorations using Digital Clinical significance:The study provides scientific background regarding the relationship between the degree of taper with resistance and retention form, and the relationship was found to be inversely proportional to each other. The recommended "degree of taper" is not always the clinically achievable as advocated in textbooks, and it is modified by various modifying or limiting factors in the actual clinical situation.

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“…Se han propuesto técnicas para alcanzar un AC adecuado (Parker et al, 2003). Y finalmente se ha realizado investigación asociando el AC a la cantidad de superficie dentaria (Chan et al), a su resistencia a la carga (Cameron et al, 2006), y al complemento con surcos y cajas (Bowley & Lai, 2007). Ninguno de estos estudios ha mostrado una forma de calcular el AC de las preparaciones de manera directa.…”

Section: Discussionunclassified

Algoritmo Matemático para Cuantificar Directamente el Ángulo de Convergencia en Preparaciones de Dientes Artificiales

Flores¹,

Lebrecht²,

Figueroa³

2011

Int. J. Morphol.

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RESUMEN: El objetivo de este trabajo fue determinar un algoritmo matemático para cuantificar directamente el ángulo de convergencia (AC) en troqueles de preparaciones dentarias. El modelo experimental consistió en preparaciones coronarias simuladas sobre troqueles de yeso, en el cual el AC fue calculado por tres formulas trigonométricas. Las formulas fueron obtenidas de un modelo matemático en el cual la preparación coronaria representa una forma de pirámide truncada, la cual permite una proyección triangular en un plano. Fueron realizadas 60 mediciones in situ sobre las paredes de 15 troqueles. Se obtuvo una imagen de cada troquel usando una cámara digital (Schick® CDR). El AC fue medido usando la herramientas del software (Control). Los datos fueron analizados estadísticamente y se aplicaron test de propagación de errores. Los ángulos calculados con las tres fórmulas matemáticas ([F1], [F2] y [F3]) mostraron un alto nivel de correlación con el grupo control excepto para dos muestras. Dentro de las limitaciones de este estudio podemos concluir que a través de este algoritmo matemático, es posible cuantificar directamente el AC de las preparaciones coronarias en troqueles. Actualmente la evaluación de los AC tanto en preparaciones realizadas por alumnos de pregrado de odontología como por dentistas, se hacen de manera subjetiva. Las tres fórmulas presentadas en el algoritmo tiene una correlación alta para cuantificar el AC en troqueles. La [F3], es la que mas correlación logra en todas las muestras (0,89).

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The effect of preparation taper on the retention of cemented cast crowns under lateral fatigue loading

Cited by 36 publications

References 13 publications

Effect of air-abrasion on the retention of zirconia ceramic crowns luted with different cements before and after artificial aging

Effect of air-abrasion on the retention of zirconia ceramic crowns luted with different cements before and after artificial aging

Assessment of Retention and Resistance Form of Tooth Preparations for All Ceramic Restorations using Digital Imaging Technique

Algoritmo Matemático para Cuantificar Directamente el Ángulo de Convergencia en Preparaciones de Dientes Artificiales

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