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2012, vol. 28, br. 66, str. 1171-1179
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Ispitivanje čvrstine veze između pločastih zubnih proteza i materijala za izradu mekog podlaganja
Strength testing of the relation between plate dentures and materials for making soft liners
aUniverzitet u Nišu, Mašinski fakultet, Srbija bUniverzitet u Nišu, Medicinski fakultet, Srbija + Univerzitet u Nišu, Medicinski fakultet, Katedra Stomatološka protetika, Srbija cUniverzitet u Nišu, Medicinski fakultet, Katedra Stomatološka protetika, Srbija
e-adresa: dulep@masfak.ni.ac.rs
Ključne reči: materijali za meko podlaganje; pločasta zubna proteza; zatezna čvrstina veze; potapanje u vodi
Sažetak
Uvod. Gubitak adhezije između zubne proteze izrađene od toplopolimerizovanog poli (metil metakrilata) i materijala za meko podlaganje (rezilijentan materijal) može dovesti do apsorpcije vode, naseljavanja bakterija, pa čak i gubitka funkcije same proteze. Cilj rada bio je određivanje čvrstine veze između poli (metil metakrilata) i materijala za podlaganje proteze i njene zavisnosti od potapanja u vodeno kupatilo na temperaturi od 37°C. Materijal i metode. Četiri materijala za meko podlaganje (2 na bazi mekanih akrilata i 2 silikonska elastomera) vezana su za toplo polimerizovani akrilat prema uputstvima proizvođača. Za ispitivanje čvrstine veze korišćeno je četrdeset uzoraka (po 10 za svaki tip podlaganja). Polovina uzoraka testirana je neposredno nakon pripreme (kontrolna grupa; n=5). Preostali uzorci potopljeni su u vodu na temperaturi od 37°C (eksperimentalna grupa; n=5) u trajanju od nedelju dana, nakon čega su testirani . Rezultati. Čvrstina veze na uzorcima neposredno nakon izrade značajno je veća kod podlaganja na bazi silikona, u odnosu na meke akrilate. Čvrstina veze između poli (metil metakrilata) baze i sloja materijala za meko podlaganje jača je nakon jednonedeljnog potapanja u vodu temperature 37 °C. Zaključak. Veći priraštaj čvrstina veze uočen je kod silikonskih elastomera u odnosu na meke akrilate. Nije bilo promene tipa loma uzoraka pre i nakon stajanja u vodi, izuzev kod GC Reline Soft materijala za meko podlaganje, gde je ujedno izmeren i najmanji priraštaj čvrstoće.
Abstract
Introduction. In clinical practice, the loss of adhesion between the denture base resin and reliner might cause the loss of material softness, water sorption, bacterial colonization and functional failure of the prosthesis. Aim. This study evaluated the effect of immersion on tensile bond strengths of four soft relining materials to a denture base acrylic resin. Material and methods. Four soft lining materials were bonded to heatpolymerized acrylic resin according to the manufacturers' directions. Forty specimens for bond strength test (10 for each liner type) were fabricated. Half of them (control group; n=5) were tested immediately after the fabrication. The other twenty specimens were stored in water at 37°C (test groups; n=5) for one week and then tested. Results. Bond strength of samples right after the fabrication is significantly higher in cases of the samples with silicone elastomer base reliner compared to the samples with soft acrylic base. Bond strength of soft reliners to a denture base resin increases after storing the samples in a water bath for one week at 37°C. Conslusion. Higher increment of tensile bond strength appeared for silicone elastomers in comparison with soft acrylic resins. There were no changes of failure mode except for GC Reline Soft application with the lowest tensile bond strength increment.
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