Axial-wall inclination angle and vertical height interactions in molar full crown preparations

Bowley, John F.

doi:10.1016/j.jdent.2006.06.002

Cited by 26 publications

(26 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Previous in vitro studies revealed that the best marginal accuracies of zirconia copings produced by CAD/CAM systems occurred when the angles of the axial walls were prepared with a 12-degree axial taper 18,19) . Other studies have shown that the retention forces on abutments, especially for conventionally luted restorations, are signifi cantly higher when the axial walls are prepared such that they are nearly parallel to each other (convergence angles≤5°) 20,21) . An increased axial taper of the preparation will decrease the retention characteristics.…”

Section: Introductionmentioning

confidence: 99%

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

et al. 2012

View full text Add to dashboard Cite

This study evaluated the effect of different parameters on the marginal precision of CAD/CAM-fabricated zirconia copings. Specimens (n=60) were fabricated with two different scanners and two milling systems. The copings were evaluated with respect to their mean and average maximum marginal gaps. A two-way analysis of variance (ANOVA) (α=0.05) was used to evaluate the effect of different parameters (scanner, milling process) on marginal accuracy. The mean (averaged maximum) marginal gaps ranged from 57.9 (112.2 μm) to 71.0 (144.6 μm) in the "as machined" state. After manual adaptation, the respective values ranged from 54.6 (98.0 μm) to 59.9 (107.7 μm). The system and manual adaptation variables were found both to have multiple signifi cant effects on the marginal gap size and to have a complex interaction. Thus, synchronized/validated processing chains should be preferentially used to guarantee optimal fi tting accuracy for CAD/CAM zirconia restorations.

show abstract

Section: Introductionmentioning

confidence: 99%

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Unfortunately, they generally do not incorporate variations in axial wall height around the periphery of the margin. Instead, they are lim-ited to a single geometry with fixed axial wall height and focus on other crown design factors, including taper of the axial wall, [8][9][10] crown and/or core thickness, 11 margin configuration (e.g., chamfer vs. shoulder), 9,12,13 uniformity and thickness of cement space, 12,14 and other issues of clinical relevance. Thus, they provide little insight into the role the variations in axial wall height might play in stress distribution and fracture evolution.…”

Section: Introductionmentioning

confidence: 99%

Effects of geometry on fracture initiation and propagation in all‐ceramic crowns

et al. 2008

View full text Add to dashboard Cite

The complex and patient-unique geometry of posterior all-ceramic dental crowns represents a particularly interesting set of challenges to understanding stress concentration and fracture evolution in response to loading. A series of numerical and physical experiments, with both single cycle and fatigue loading, show that geometry profoundly influences the stress concentration and fracture initiation and propagation. In stylized crowns with uniform axial wall height, stresses concentrate beneath the indenter. As the height of the axial wall increases, loads to cause failure increase linearly. In crowns with variation in axial wall height around the periphery, stresses concentrate both beneath the indenter and at the margin of the core ceramic. The magnitude of the stress concentration at the margin is directly related to the amount of variation in axial wall height around the periphery of the crown. Anatomically correct veneered zirconia core crowns subjected to single-cycle loads, fracture in areas of greatest stress concentration identified by finite element models. Fractures and stress concentrations that occur in response to single-cycle loading are important indicators of initiation sites for fatigue failure. (c) 2008 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 2009.

show abstract

“…Clinically, a crown would hardly undergo such great tensile efforts as those applied in this study, but the tested experimental conditions serve as parameters to evaluate different properties and behaviors of the materials used. 8,9 The results of the present study may be explained by the fact that higher preparation height promotes greater superficial area with the crown. Although other factors may influence on crown retention, the preparations were standardized (cervical diameter, taper, roughness, piece fit), thus eliminating or minimizing the interference of these variables on the results.…”

Section: Discussionmentioning

confidence: 60%

Effect of different preparation heights and luting agents on tensile bond strengths in Nickel Chromium crown – a comparative invitro study

Babar¹,

Bhide²,

jadhav³

2016

IOSR

View full text Add to dashboard Cite

Axial-wall inclination angle and vertical height interactions in molar full crown preparations

Cited by 26 publications

References 13 publications

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

Multifactorial analysis of the impact of different manufacturing processes on the marginal fit of zirconia copings

Effects of geometry on fracture initiation and propagation in all‐ceramic crowns

Effect of different preparation heights and luting agents on tensile bond strengths in Nickel Chromium crown – a comparative invitro study

Contact Info

Product

Resources

About