Marginal accuracy of metal ceramic restorations with porcelain facial margins

Boyle, John J.; Naylor, W. Patrick; Blackman, Ronald B.

doi:10.1016/0022-3913(93)90234-f

Cited by 16 publications

(8 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Before the next margin correction build-up, the technician had to grind and correct the inner portion of the margin porcelain to adapt the FPD on the die, so the internal angle of facial porcelain veneer might become round, and the internal gap might become greater. There were some reports that the internal marginal gap was greater than the external marginal gap in porcelain margin of collarless metal-ceramic crowns 20,21. This phenomenon could have caused the lower fracture strength of the porcelain margin groups.…”

Section: Discussionmentioning

confidence: 95%

A study on the fracture strength of collarless metal-ceramic fixed partial dentures

et al. 2010

View full text Add to dashboard Cite

PURPOSEThe objective of this study was to evaluate fracture strength of collarless metal-ceramic FPDs according to their metal coping designs.MATERIALS AND METHODSFour different facial margin design groups were investigated. Group A was a coping with a thin facial metal collar, group B was a collarless coping with its facial metal to the shoulder, group C was a collarless coping with its facial metal 1 mm short of the shoulder, and group D was a collarless coping with its facial metal 2 mm short of the shoulder. Fifteen 3-unit collarless metal-ceramic FPDs were fabricated in each group. Finished FPDs were cemented to PBT (Polybutylene terephthalate) dies with resin cement. The fracture strength test was carried out using universal testing machine (Instron 4465, Instron Co., Norwood MA, USA) at a cross head speed of 0.5 mm/min. Aluminum foil folded to about 1 mm of thickness was inserted between the plunger tip and the incisal edge of the pontic. Vertical load was applied until catastrophic porcelain fracture occurred.RESULTSThe greater the bulk of unsupported facial shoulder porcelain was, the lower the fracture strength became. However, there were no significant differences between experimental groups (P > .05).CONCLUSIONAll groups of collarless metal-ceramic FPDs had higher fracture strength than maximum incisive biting force. Modified collarless metal-ceramic FPD can be an alternative to all-ceramic FPDs in clinical situations.

show abstract

Section: Discussionmentioning

confidence: 95%

A study on the fracture strength of collarless metal-ceramic fixed partial dentures

et al. 2010

View full text Add to dashboard Cite

show abstract

“…The acceptable clinical marginal opening is between 40 and 120 um [14,15] . There was no significant difference found between the three ceramic types before and after aging which is similar to findings of other studies [16,17] .…”

Section: Discussionmentioning

confidence: 99%

“…Otherwise, complications that include dissolution of the luting cement, plaque accumulation with subsequent gingival inflammation, caries, pulpal involvement, and the creation of stress concentrations (which may reduce the strength of the restoration with subsequent fracture [13] ) may result. The most widely accepted clinical marginal opening ranges from 40 to 120 µm [14,15] .…”

Section: Introductionmentioning

confidence: 99%

Effect of artificially accelerated aging on margin fit and color stability of laminate veneers

Hamza¹,

Al-Baili²,

Abdel‐Aziz³

2018

SDS

View full text Add to dashboard Cite

Aim: The purpose of the study was to evaluate the effect of artificially accelerated aging on marginal fit and color stability of three CAD/CAM materials used to fabricate laminate veneers. Methods:A typodont maxillary central incisor tooth was prepared to receive a ceramic veneer, then duplicated to create 15 epoxy resin teeth equally divided into three groups according to the ceramic used to fabricate laminate veneers. Three groups were established: Group (N) nano-hybrid ceramic (Lava™ Ultimate; 3M ESPE); Group (L) CAD/CAM lithium disilicate glass ceramic block (IPS e.max ® CAD; Ivoclar Vivadent); and Group (F) leucite-reinforced glass ceramic block (IPS Empress ® CAD; Ivoclar Vivadent). All of the specimens were subjected to artificial aging using a weathering process in a Weather-O-meter for 300 h. Margin fit and color measurements were carried out before and after artificial aging of the laminates. Results:The results for the marginal fit revealed that there was no statistically significant difference between the mean marginal gap distance of the aged and non-aged specimens in the nano-hybrid ceramic. However, lithium disilicate glass ceramic and leucite-reinforced glass ceramic blocks showed a statistically significant change in the marginal gap. For color measurement, Lava™ Ultimate demonstrated a significant decrease in (a*) value while the (L*) and (b*) values did not show a statistically significant change. Conclusion:Within the limitation of this study, it can be concluded that aging the nano-hybrid ceramic had a superior marginal fit and inferior color stability.

show abstract

“…All‐ceramic crowns and fixed partial denture retainers made with high strength alumina and zirconia core materials do not need to be strengthened by resin bonding but may have visible margins or fit discrepancies and can benefit from using aesthetic, tooth shade, resin cement. It should be recalled that porcelain margins round to a degree during firing and various all‐ceramic systems differ in their quality of marginal fit 17,18 . Therefore, more cement exposure may be anticipated for all‐ceramic (or resin) restorations as compared to metal or metal‐ceramic restorations and solubility, resistance to wear, and aesthetics all dictate the use of resin cement.…”

Section: Introductionmentioning

confidence: 99%

A clinically focused discussion of luting materials

Hill

Lott

2011

Australian Dental Journal

139

131

View full text Add to dashboard Cite

A luting agent's primary function is to fill the minute void between an indirect restoration (definitive or provisional) and tooth (or implant abutment) and mechanically lock the restoration in place to prevent dislodgement during function. The purpose of this paper is to provide a clinically focused discussion on the broad spectrum of luting materials currently available to help the general practitioner make appropriate choices. Resins are typically formulated for a specific function or restoration and offer strength, aesthetics, flexible working times, and very low solubility yet are technique sensitive, expensive and often hard to clean-up. Glass-ionomers offer good strength and optical properties plus the potential for fluoride release ⁄ recharge but may have short working times, are sensitive to moisture or dehydration early on, and take time to fully set. Resin-modified glass-ionomers are hybrid, dual-phase materials which are manipulated like glass-ionomer but set quicker and are stronger. Zinc phosphate cement, used successfully for over a century to lute well-fitting metal and metal-ceramic definitive restorations, is a very inexpensive, rigid material which displays very high early compressive strength yet acidity and solubility can be problems. Polycarboxylate cement (a hybrid of zinc phosphate) has lower compressive strength but high tensile strength and may be less injurious to the pulp. Zinc oxide eugenol and zinc oxide noneugenol cements typically have good sealing abilities but their relatively low compressive and tensile strengths, inherent brittleness, and high solubility limit usage to provisional restorations or implant supported crowns. Claims for multipurpose or universal use by manufacturers can be somewhat confusing and overwhelming. Even so, the busy general practitioner must have sufficient knowledge to help choose an appropriate luting agent for each unique clinical situation.

show abstract

Marginal accuracy of metal ceramic restorations with porcelain facial margins

Cited by 16 publications

References 15 publications

A study on the fracture strength of collarless metal-ceramic fixed partial dentures

A study on the fracture strength of collarless metal-ceramic fixed partial dentures

Effect of artificially accelerated aging on margin fit and color stability of laminate veneers

A clinically focused discussion of luting materials

Contact Info

Product

Resources

About