Effect of ultrasonic instrumentation on the retention of simulated cast crowns

McQuade, Michael J.; Huget, Eugene F.; Simon, Laszlo B. De; Levin, Marvin P.

doi:10.1016/s0022-3913(78)80074-2

Cited by 9 publications

(6 citation statements)

References 11 publications

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“…10,14 Other investigators also indicated its use for the removal of crowns. 12,15 However, the findings of these studies are contradictory, and this discrepancy might be explained by factors such as conicity of the preparation, time of instrumentation, type of cementing agent and thermal cycling. 13,15 In the present study, a 16 o conicity was prepared since it provides adequate tensile bond strength for crowns cemented with zinc phosphate cement and it is closest to the convergence angle obtained in clinical practice.…”

Section: Discussionmentioning

confidence: 99%

“…16,17 The time of instrumentation seems to be decisive in the reduction of the tensile bond strength of crowns cemented with zinc phosphate cement. 12 Bond strength is provided by mechanical interlocking between cement and crown and between cement and tooth due to the fact that, no matter how smooth a surface seems, it contains irregularities at the microscopic level.…”

Section: Discussionmentioning

confidence: 99%

“…7,8 The possibility that ultrasonic instrumentation may cause fragility of the zinc phosphate cement has been widely accepted for intraradicular retainers 9-11 but little is known about its action on crowns and fixed partial dentures. 12,13 Thus, the objective of the present study was to determine the in vitro effect of ultrasonic instrumentation on the bond strength of crowns cemented with a zinc phosphate agent to teeth receiving standardized preparations compared to that observed on teeth not submitted to instrumentation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of ultrasonic instrumentation on the bond strength of crowns cemented with zinc phosphate cement to natural teeth. An in vitro study

Filho¹,

Mori

Jardini³

et al. 2008

Braz. oral res.

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Several studies have reported the benefits of sonic and/or ultrasonic instrumentation for root debridement, with most of them focusing on changes in periodontal clinical parameters. The present study investigated possible alterations in the tensile bond strength of crowns cemented with zinc phosphate cement to natural teeth after ultrasonic instrumentation. Forty recently extracted intact human third molars were selected, cleaned and stored in physiologic serum at 4°C. They received standard preparations, at a 16º convergence angle, and AgPd alloy crowns. The crowns were cemented with zinc phosphate cement and then divided into four groups of 10 teeth each. Each group was then subdivided into two subgroups, with one of the subgroups being submitted to 5,000 thermal cycles ranging from 55 ± 2 to 5 ± 2°C, while the other was not. Each group was submitted to ultrasonic instrumentation for different periods of time: group 1 -0 min (control), group 2 -5 min, group 3 -10 min, and group 4 -15 min. Tensile bond strength tests were performed with an Instron testing machine (model 4310). Statistical analysis was performed using ANOVA and Tukey's test at the 5% level of significance. A significant reduction in the tensile bond strength of crowns cemented with zinc phosphate and submitted to thermal cycles was observed at 15 min (196.75 N versus 0 min = 452.01 N, 5 min = 444.23 N and 10 min = 470.85 N). Thermal cycling and ultrasonic instrumentation for 15 min caused a significant reduction in tensile bond strength (p < .05).

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of ultrasonic instrumentation on the bond strength of crowns cemented with zinc phosphate cement to natural teeth. An in vitro study

Filho¹,

Mori

Jardini³

et al. 2008

Braz. oral res.

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“…Vibration of well-fitting cemented cast restorations with ultrasound had little effect on retention in a laboratory study (12). The patient bites down and compresses the resin block to about two-thirds of the original thickness.…”

Section: The Richwell Crown and Bridge Removermentioning

confidence: 96%

Disassembly techniques to gain access to pulp chambers and root canals during non‐surgical root canal re‐treatment

Rhodes¹

2008

Endodontic Topics

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“…Its disadvantage is time consuming. The effect of ultrasonic vibration on retention of restorations has been proved to be negative [23]. Melo Filho et al [24] concluded that the application of ultrasonic vibration at the gingival margin of the crown for 15s may cause a reduction in tensile bond strength due to breakdown the cement layers [1] [8].…”

Section: Ultrasonicmentioning

confidence: 99%

Systems and Techniques for Removal of Failed Fixed Partial Dentures: A Review

Moaleem¹

2016

AJHR

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Abstract:FPDs have a long life span but sometimes they should be removed for several reasons at which they are; secondary caries, the need for root canal treatment, severe gingival recession or periodontal disease, loosened retainer of a bridge, post loosening, root fracture, over contoured and unaesthetic restorations. The removal of temporary crowns and bridges are usually straightforward, while the removing of permanent cemented restorations are always an unpleasant, anxietyridden, risky subject for both dentist and patient. So the objective of the bridge removal is the ability to reuse them and to avoid damaging of the underlying tooth and supporting structures. The FPDs removal instruments are: large spoon excavator, scalar tip, brass ligature wires, matrix band, chisel and hammer. In addition to that, there are also coronal disassembly crown remover forceps, precision-made air-activated units; modified techniques have also been highlighted in this article for ease of use for the clinician. The aim of this review is to give an overview and describe the various available systems and techniques to remove the FPDs and to provide different options for each clinical condition. A PubMed literature was conducted up to June 2015 using the keywords: Crown and bridge (removal, disassembly, failure). Additionally, the bibliographies of 5 previous reviews, their cross references were manually searched.

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Effect of ultrasonic instrumentation on the retention of simulated cast crowns

Cited by 9 publications

References 11 publications

Effect of ultrasonic instrumentation on the bond strength of crowns cemented with zinc phosphate cement to natural teeth. An in vitro study

Effect of ultrasonic instrumentation on the bond strength of crowns cemented with zinc phosphate cement to natural teeth. An in vitro study

Disassembly techniques to gain access to pulp chambers and root canals during non‐surgical root canal re‐treatment

Systems and Techniques for Removal of Failed Fixed Partial Dentures: A Review

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