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Register a new userIn Vitro Study the Differential Thickness Strength of Porcelain Laminate Veneers to Fracture Forces
دراسة مخبرية لمقاومة الثخانات المختلفة لوجوه البورسلين لقوى الكسر
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سهام سايس( باحث )
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يستخدم البورسلين بسماكات رقيقة لصنع الوجوه التجميلية. إن البورسلين الفلدسباري المنخفض درجة الانصهار المستخدم في صناعة الوجوه التجميلية هو خزف قصف سهل الكسر قبل إلصاقه إلى الأنسجة السنية، إن إلصاق وجوه البورسلين إلى الأنسجة السنية بالإسمنت الراتنجي بعد تخريشه بحمض الفلور و تطبيق مادة السيلان يحسن من مقاومته للكسر تحسناً كبيراً. هدف البحث: هو دراسة الثخانة المناسبة للصفائح المصنوعة من البورسلين الفلدسباري، و علاقة ذلك بمقاومتها للانحناء.
Porcelain is used in thin thicknesses to fabricate ceramic veneers. The low fusing feldspathic porcelain used to fabricate porcelain veneers is easily fractured, brittle porcelain before cementation to tooth structure. However, its fracture resistance improves significantly after etching with hydrochloric acid, applying the silane and luting to tooth structure with resin cement. Aim of the study: to evaluate the appropriate thickness of laminates made from feldspathic porcelain and its relation to flexural strength.
References used
Belser UC, Magne P, Magne M. Ceramic laminate veneers: continuous evolution of indications. J Esthet Dent 1997;9:197-207
Edelhoff D, Soresen JA. Tooth structure removal associated with various preparation designs for anterior teeth. J Prosthet Dent 2002;87:503-9
Scherrer SS, de Rijk WG. The fracture resistance of all-ceramic crowns on supporting structures with different elastic moduli. Int J Prosthodont 1993;6:462
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This study aimed to test the efficiency of debonding porcelain laminate veneers
(PLV) by using two application modes of Er:YAG laser (contact and non-contact mode),
and testing the change in dental pulp temperature for both application modes.
Sixt
een extracted, non-carious human maxillary premolars, prepared for receiving
PLV, which fabricated of e.max and bonded by light cured resin cement. They divided into
two groups, each of them had 8 samples based on the application mode; group A with noncontact
mode, and group B with contact mode. Veneers of both groups debonded by the
same laser parameters (360mJ, 15Hz) during loading of a 20newton force on a specially
fabricated cervical margin of veneers. Debonding time and change of temperature was
recorded, then entered into SPSS V.19 and T-test for independent samples was applied.
All veneers were debonded, samples of non-contact mode group had much lower
debonding time (12.6 second) than contact mode samples (96.3 second), but with higher
change of temperature in non-contact (4.2 centigrade) than in contact mode (2.9
centigrade).p value was much less than 0.05%.
Within limits of this study, we can conclude that non-contact application mode was
more efficient in reducing debonding time than contact application mode at same laser
energy and frequency parameters, but with a higher change in pulp temperature.
The results discussion confirms that we have to treat all grinded porcelain
surfaces and not to leave them rough if we could not send them back to the
lap. for reglazzing.
this study shows the possibility of using shoufu kit to polish the
grinded
porcelain in state of re-glazing it.
Porcelain Laminate Veneers have shown promising results recently
when used as an alternative to metal ceramic restorations for the
anterior teeth. Long-term success for any restoration depends on the
marginal fit, because marginal gaps increase pl
aque accumulation
and causing periodontitis. The aim of this study was to Asses
marginal fit changes according to were curing the bond agent before
or after cementation.
Background& Objective: This study was carried out to test fracture resistance of crowns with Zirconia
core made by CAD/CAM of two thicknesses, and test the influence of decreasing the core thickness on its
fracture resistance, and study the patterns of failure.
The of this study was to evaluate the bonding strength of a
posterior composite restorations when two different types of
equipment methods were used for preparation of dentin (Erbium-doped
yttrium aluminum garnet laser (Er:YAG ) and diamond burs).
This study specimen consisted of Eighty molars, was divided
randomly into two main groups (40 molars were prepared with
diamond burs, and 40 molars were prepared with laser Er: YAG).
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