2 research outputs found
ΠΠ½Π°Π»ΠΈΠ· ΠΌΠ°ΡΠ³ΠΈΠ½Π°Π»ΡΠ½ΡΡ ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΠΉ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠΊΠ΅ΡΠ°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ ΠΊΠΎΡΠΎΠ½ΠΎΠΊ Π² ΠΏΡΠΎΡΠ΅ΡΡΠ΅ ΡΠΆΠΈΠ³Π°Π½ΠΈΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ ΠΊΠΎΠ½Π΅ΡΠ½ΡΡ ΡΠ»Π΅ΠΌΠ΅Π½ΡΠΎΠ²
Considering the deformations appeared after the firing process of ceramic, we tried to establish if there is any relation between these and the type of peripheral preparation, on the one hand, and the coefficient of thermal expansion of metal and porcelain, on the other hand.The study is original and was conducted in COSMOS DesignSTAR, consisting in finite element analysis of firing process. The tested objects were created in RhinoCeros Nurbs modeling for Windows, version 4.0. It consists of three models, each one with abutment, metal cape and ceramic veneer, but with different type of peripheral preparation: shoulder with metal collar, shoulder without metal collar and chamfer with metal collar.The results suggested that the shoulder without metal-collar model recorded the highest marginal distortion and the chamfer model the smallest, and the higher the difference between thermal expansion coefficients the higher the marginal distortion .ΠΡΡ
ΠΎΠ΄Ρ ΠΎΡ ΠΏΠΎΡΠ²Π»Π΅Π½ΠΈΡ ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΠΉ ΠΈ Π΄Π΅ΡΠΎΡΠΌΠ°ΡΠΈΠΉ Π²ΠΎ Π²ΡΠ΅ΠΌΡ ΠΏΡΠΎΡΠ΅ΡΡΠ° ΡΠΆΠΈΠ³Π°Π½ΠΈΡ ΠΏΡΠΈ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½ΠΈΠΈ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠΊΠ΅ΡΠ°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΠΎΡΠΎΠ½ΠΎΠΊ, Π² ΡΡΠΎΠΉ ΡΠ°Π±ΠΎΡΠ΅ ΠΌΡ ΠΏΡΠ΅Π΄Π»Π°Π³Π°Π΅ΠΌ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΡ ΡΠΎΠ»Ρ Π²Π»ΠΈΡΠ½ΠΈΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΏΡΠ΅ΠΏΠ°ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π·ΡΠ±Π½ΡΡ
ΡΡΠ±ΡΡΡΡΠΊΡΡΡ ΠΈ ΠΊΠΎΡΡΡΠΈΡΠΈΠ΅Π½ΡΠ° ΡΠ΅ΡΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΊΡΠΏΠ°Π½ΡΠΈΠΈ Π½Π° ΡΠΈΠ½Π°Π»ΡΠ½ΡΡ ΠΌΠ°ΡΠ³ΠΈΠ½Π°Π»ΡΠ½ΡΡ Π°Π΄Π°ΠΏΡΠ°- ΡΠΈΡ.ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΎΡΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π‘ΠΠΠΠΠ Design STAR. Π’Π΅ΡΡΠΈΡΠΎΠ²Π°Π½Π½ΡΠ΅ ΠΌΠΎΠ΄Π΅Π»ΠΈ Π±ΡΠ»ΠΈ ΠΈΠ·Π³ΠΎΡΠΎΠ²Π»Π΅Π½Ρ Π² Rhino-Ceros Nurbs modeling Π΄Π»Ρ Windows version 4.0. ΠΠ° ΠΎΡΠ½ΠΎΠ²Π°Π½ΠΈΠΈ ΡΠΊΡΠΏΠ΅ΡΠΈΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΌΠΎΠΆΠ½ΠΎ ΠΊΠΎΠ½ΡΡΠ°ΡΠΈΡΠΎΠ²Π°ΡΡ ΡΡΠΎ ΠΊΠΎΠ΅ΡΠΈΡΠΈΠ΅Π½Ρ ΡΠ΅ΡΠΌΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠΊΡΠΏΠ°Π½ΡΠΈΠΈ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ ΠΏΡΠ΅ΠΏΠ°ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π·ΡΠ±ΠΎΠ² Π΄Π»Ρ ΠΌΠ΅ΡΠ°Π»Π»ΠΎΠΊΠ΅ΡΠ°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΠΎΡΠΎΠ½ΠΎΠΊ ΠΈΠ³ΡΠ°Π΅Ρ Π²Π°ΠΆΠ½ΡΡ ΡΠΎΠ»Ρ Π² ΡΠΈΠ½Π°Π»ΡΠ½ΠΎΠΉ ΠΌΠ°ΡΠ³ΠΈΠ½Π°Π»ΡΠ½ΠΎΠΉ Π°Π΄Π°ΠΏΡΠ°ΡΠΈΠΈ
ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠ΅ Π²Π»ΠΈΡΠ½ΠΈΡ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΏΡΠ΅ΠΏΠ°ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΊΠ°ΡΠΈΠΎΠ·Π½ΡΡ ΠΏΠΎΠ»ΠΎΡΡΠ΅ΠΉ Π½Π° ΠΌΠ°ΡΠ³ΠΈΠ½Π°Π»ΡΠ½ΠΎΠ΅ ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠ΅ ΠΏΡΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ ΡΠ΅ΡΡΠ°Π²ΡΠ°ΡΠΈΡΡ
Due to their morphological and clinical-biological particularities, the occlusal surfaces benefit from a special therapeutic management. Modern preparation of the cavity surfaces may be carried out with air abrasion devices or aerated salt powder polishing devices (Prophyjet). The adhesion of composite resins is obtained nowadays with 7th generation monocomponent selfetching agents whose marginal sealing nevertheless proved to be inferior to the one obtained by the application of the adhesive system in 3 separate times. The purpose of our study was to assess marginal sealing of occlusal restorations through a colorimetric method in different clinical situations in which we used the afore-mentioned devices and to which either selfetching adhesive system was applied alone or together with an additional acid conditioning. The outcomes statistically analyzed demonstrated that marginal sealing improved significantly by the use of one of the 2 devices and the additional acid conditioning of the enamel margins.ΠΠ΅ΡΠ΅Π½ΠΈΠ΅ ΠΊΠ°ΡΠΈΠ΅ΡΠ° ΠΆΠ΅Π²Π°ΡΠ΅Π»ΡΠ½ΡΡ
ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ΅ΠΉ ΡΡΠ΅Π±ΡΠ΅Ρ ΡΠΏΠ΅ΡΠΈΠ°Π»ΡΠ½ΡΠΉ ΡΠ΅ΡΠ°ΠΏΠ΅Π²ΡΠΈΡΠ΅ΡΠΊΠΈΠΉ ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ ΠΈΠ·-Π·Π° Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠ½ΡΡ
ΠΌΠΎΡΡΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ ΠΊΠ»ΠΈΠ½ΠΈΠΊΠΎ-ΡΠ΅ΡΠ°ΠΏΠ΅Π²ΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΡΡΠΈΡ
Π·ΠΎΠ½. ΠΠΎ Π°ΠΊΡΡΠ°Π»ΡΠ½ΡΠΌ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌ Π΄Π»Ρ ΡΠ°Π΄ΡΡΠ΅Π³ΠΎ ΠΏΡΠ΅ΠΏΠ°ΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠ΅ΠΉ ΠΌΠΎΠΆΠ΅ΠΌ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°ΡΡ Π²ΠΎΠ·Π΄ΡΡ
ΠΎ-Π²ΠΎΠ΄Π½ΠΎ-Π°Π±ΡΠ°Π·ΠΈΠ²Π½ΡΠΉ ΠΌΠ΅ΡΠΎΠ΄ (Fluid-air-abrazion) ΠΈΠ»ΠΈ Prophyjet. ΠΡΠΈ ΡΠ΅ΡΡΠ°Π²ΡΠ°ΡΠΈΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ°ΠΌΠΈ ΠΈΡΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ Π°Π΄Π³Π΅Π·ΠΈΠ²Π½Π°Ρ ΠΌΠΎΠ½ΠΎΡΠΈΡ- ΡΠ΅ΠΌΠ° VII Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ, ΠΊΠΎΡΠΎΡΠ°Ρ ΠΎΠΊΠ°Π·ΡΠ²Π°Π΅ΡΡΡ ΠΈΠΌΠ΅Π΅Ρ Π½Π΅ΠΊΠΎΡΠΎΡΡΠ΅ Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΈ Π² ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΈ Ρ ΡΡΡΡ
ΡΡΠ°ΠΏΠ½ΠΎΠΉ ΡΠΈΡΡΠ΅ΠΌΠΎΠΉ. Π¦Π΅Π»Ρ Π½Π°ΡΠ΅ΠΉ ΡΠ°Π±ΠΎΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΡ ΠΌΠ°ΡΠ³ΠΈΠ½Π°Π»ΡΠ½ΠΎΠ΅ Π°Π΄Π³Π΅Π·ΠΈΠ²Π½ΠΎΠ΅ ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠ΅ ΠΏΡΠΈ ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠ½ΡΡ
ΡΠ΅ΡΡΠ°Π²ΡΠ°ΡΠΈΡΡ
ΠΊΠΎΠ»ΠΎΡΠΈΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΌΠ΅ΡΠΎΠ΄ΠΎΠΌ Π² ΡΠ°Π·Π½ΡΡ
ΠΊΠ»ΠΈΠ½ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠΈΡΡΠ°ΡΠΈΡΡ
, ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΡ Π°Π΄Π³Π΅Π·ΠΈΠ²Π½ΡΡ ΠΌΠΎΠ½ΠΎΡΠΈΡΡΠ΅ΠΌΡ VII Π³Π΅Π½Π΅ΡΠ°ΡΠΈΠΈ ΠΈΠ»ΠΈ ΡΡ ΠΆΠ΅ ΡΠΈΡΡΠ΅ΠΌΡ ΠΏΠ»ΡΡ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΠΎΠ΅ ΠΊΠΈΡΠ»ΠΎΡΠ½ΠΎΠ΅ ΠΏΡΠΎΡΡΠ°Π²Π»ΠΈΠ²Π°Π½ΠΈΠ΅.ΠΡΠΈ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΎΠΌ Π°Π½Π°Π»ΠΈΠ·Π΅ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ Π΄Π΅ΠΌΠΎΠ½ΡΡΡΠΈΡΡΡΡ ΡΡΠΎ ΠΌΠ°ΡΠ³ΠΈΠ½Π°Π»ΡΠ½ΠΎΠ΅ ΡΠΎΠ΅Π΄ΠΈΠ½Π΅Π½ΠΈΠ΅ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΡΠ»ΡΡΡΠ°Π΅ΡΡΡ ΠΊΠΎΠ³Π΄Π° ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ ΠΎΠ΄ΠΈΠ½ ΠΈΠ· Π΄Π²ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΏΡΠΈΠΌΠ΅Π½ΡΠ΅ΠΌΡΡ
Π½Π°ΠΌΠΈ ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΠΎ Ρ Π΄ΠΎΠΏΠΎΠ»Π½ΠΈΡΠ΅Π»ΡΠ½ΡΠΌ ΠΏΡΠΎΡΡΠ°Π²Π»ΠΈΠ²Π°Π½ΠΈΠ΅ΠΌ ΡΠΌΠ°Π»ΠΈ