Pozdrav BabaTunde,
Dok su radili, nisu mi stavljali tu gumu u usta. Što se tiče procedure, jedan stomatolog mi je objasnio da se all-porcelain krune mogu „zalepiti” cementom kao obične krune, ili „lepkom” isto kao venirs. Rekao mi je da je taj lepak bolji jer je cvrsci i ne curi kao cement.
Pokusao sam da nađemnešto na internetu, ali zubari kriju svoje tajne kao zmija noge :)
Nasao sam par linkova koji su možda korisni.
http://kricd.com/data/database/D0004/1226065520436.pdf
Na strani 6, pri dnu kaže:
It is a clinical fact that grease-free, clean, and dry surface
conditions cannot be fulfilled in most cases. Consequently,
the bond can be so bad that polymerization
shrinkage of the resin luting media plays a major role in
quality of the bond. Plaque accumulation is also higher
with resins than with other materials in the oral cavity,
which could lead to secondary caries or discoloration in
the marginal area. The longevity of dentin bonding is
still questionable and needs further investigation. Compared
to conventional GICs, the use of hybrid cements
has more disadvantages (water uptake and questionable
biocompatibility) than advantages.
Conclusion
The conclusion can be drawn that the stability of all-ceramic
crowns might be better when they are bonded to
enamel. If enamel is not available, the advantages of resin
cements are questionable. From the clinical and prac-
194
Fig. 7 Pros and cons for the use of resin cements in fixing all-ceramic
crowns
tical points of view, there seems to be greater benefit in
using glass-ionomer cements, which are „adhesive,” release
fluoride, and have been clinically well-proven over
years. Nevertheless, ceramics have different material
traits than alloys. Dentists and technicians have to adopt
a „ceramic thinking” to recognize the specific requirements
of ceramics. Then, successful clinical work with
all-ceramic systems is possible, even if crowns are „only”
conventionally cemented.
http://www.fitzpatrickdmd.com/crowns.html
pri dnu strane kaže:
Cementation of All-Porcelain crowns will follow the protocol utilized for porcelain inlays and onlays, namely, the restoration is cemented into place utilizing a new and uniquely designed bonding cement, which in effect fuses the restoration to the tooth, creating a strong and durable tooth and restoration. The cement is typically light cured. While the patient may eat immediately, in the case of anterior crown placement, we still recommend that the patient refrain from eating for up to one hour to allow proper final set of the cement.
http://uk.answers.yahoo.com/question/index?qid=20080912124409AAc41hs
http://www.mynewsmile.com/allporcelaincrowns.h tm
Vrlo je teško naći neke korisne informacije o ovome na internetu. S obzirom da sam ranije radio bonding, kao i nekoliko veneers, mogu da kažem da ove all-porcelain krune su „zalepljene” na isti način, samo sto dentist nije korektno (i to s namerom) postovao proceduru s namerom da krune sto pre otpadnu. to mi se i ranije desilo s jednim veneer-om, koji je otpao i stomatolog je rekao da nije bilo dovoljno „lepka” na veniru.