Measurement of the cement film thickness beneath full crown restorations

Dimashkieh, Mohiddin R.; Davies, E.R.; Fraunhofer, Von

doi:10.1038/sj.bdj.4803306

Cited by 28 publications

(12 citation statements)

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“… 49 – 51 It has been shown in the crown cementation procedure that wall tapering affects zinc phosphate filtration phenomenon and escapement at cementation procedure 52 , 53 and alleviates hydrostatic pressure during cementation. 8 , 53 – 55 The taper degree was also shown to improve the cementation and seating of cast post and core similar to the cementation of crowns.…”

Section: Discussionmentioning

confidence: 97%

Effect of tapering internal coronal walls on fracture resistance of anterior teeth treated with cast post and core: In vitro study

Shamseddine¹,

Eid²,

Homsy³

et al. 2014

Journal of Dental Biomechanics

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When fabricating indirect post and core, internal coronal walls are tapered to remove undercuts and allow a better adaptation. To evaluate the fracture strength of anterior tooth reconstructed with post and core and crowned, with two different taper of internal coronal walls, 6° and 30° to the long axis, two groups of 30 clear plastic analogues simulating endodontically treated maxillary central incisors were prepared. The analogues crowned were subjected to a compressive load with a 1-kN cell at a crosshead speed of 0.05 mm/min at 130° to the long axis until fracture occurred. Data were analyzed by Lillifors and Mann–Whitney tests. Mean failure loads for the groups were as follows: group I 1038.69 N (standard deviation ±243.52 N) and group II 1231.86 N (standard deviation ±368.76 N). Statistical tests showed significant difference between groups (p = 0.0010 < 0.01). Increasing the taper of internal coronal walls appears to enhance the fracture resistance of anterior maxillary teeth post and core reconstructed.

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Section: Discussionmentioning

confidence: 97%

Effect of tapering internal coronal walls on fracture resistance of anterior teeth treated with cast post and core: In vitro study

Shamseddine¹,

Eid²,

Homsy³

et al. 2014

Journal of Dental Biomechanics

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“…Venting of crowns decreases the film thickness (Jorgensen, 1960a; Jones et al, 1971; Dimashkieh, Davies & von Fraunhofer, 1974;Ishikiriama et al, 1981;Van Nortwick & Gettleman, 1981). Venting reduces the distance which the cement must flow under pressure.…”

Section: Discussionmentioning

confidence: 99%

The effective minimum cement thickness of zinc phosphate cement for luted non‐precious crowns

Grajower

Lewinstein

Zeltser

1985

J of Oral Rehabilitation

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Non-precious metal crowns were prepared for natural teeth which were ground to a taper angle of 5 degrees. The movement of the crowns on teeth during repeated try-on seating was measured with a micrometer. Increasing the applied load from 2 to 10 kg resulted in an average crown movement of 63 micron. For most samples this movement continued when try-on was repeated. Casting irregularities were found to create furrows on some regions of the axial tooth surface during try-on seating. The diameter of the ADA specification consistency disk for zinc phosphate cement was found to depend strongly on the P:L ratio and the ambient temperature. The castings were cemented with zinc phosphate cement of controlled consistency. Cementation with a load of 10 kg gave rise to an average crown elevation of 54 micron and a range of measurements between -8 and 113 micron. The effective minimum cement thickness corresponding to this average was calculated to be 4.7 micron. Small negative values of elevation were attributed to deepening of tooth furrows during cementation. An analysis is given of data from the literature, relevant to the cement flow and irregularities in cement thickness.

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“…As Dimashkieh and others found, the time of final seating with venting was reduced from 60 seconds to 15 seconds, thus preventing the restriction of cement flow due to curing viscosity. 24 Van Nortwick and Gettleman found that the combination of venting and internal relief seated full crowns more accurately than with either alone. 6 Jorgensen considered the hydrodynamic condition created during cementation as the primary consideration to overcome in obtaining the thinnest cement film thickness.…”

Section: Ventingmentioning

confidence: 99%

“…5 Oliveira and others found that vibration improved the adaptation of MOD inlays. 24 Ishikiriama and others found that the mechanical vibration of crowns at cementation promotes a better fit. 4 …”

mentioning

confidence: 99%

Effect of Venting and Seating Techniques on the Cementation of Complete Coverage Restorations

Cruz¹,

Sorenson²,

Johnson³

2008

Operative Dentistry

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The best seating of complete crowns during cementation can be achieved by venting the crown and using a tapping cementation technique. When the crown is not vented, a dynamic seating method provides the best seating. 39 Impressions were made, stone dies fabricated, die spacer was applied and the crowns were waxed and cast in type III gold. The respective crowns were placed on the teeth and preloaded. The distance between reference marks on the tooth and crown were measured at four points around each tooth. Zinc phosphate cement was mixed and the crowns were cemented in the following groups: 1) vented, tapping the crown into place with a mallet, 2) non-vented, tapping the crown into place, 3) vented static seating with a 25 kg load, 4) non-vented dynamic seating, 5) non-vented static loading with a 25 kg load. A 25 kg load was then maintained on the crowns during the cement setting time. Distances between reference marks were then measured and the change in post-cementation distances calculated.Results. ANOVA (F=14.995, p<.0001) and multiple range tests revealed significant differences between the groups. The mean increased postcementation distances for the seating groups were (µm): 1) 132 ± 20, 2) 372 ± 26, 3) 367 ± 59, 4) 239 ± 35, 5) 537 ± 45.

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Measurement of the cement film thickness beneath full crown restorations

Cited by 28 publications

References 0 publications

Effect of tapering internal coronal walls on fracture resistance of anterior teeth treated with cast post and core: In vitro study

Effect of tapering internal coronal walls on fracture resistance of anterior teeth treated with cast post and core: In vitro study

The effective minimum cement thickness of zinc phosphate cement for luted non‐precious crowns

Effect of Venting and Seating Techniques on the Cementation of Complete Coverage Restorations

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