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- Title
Push-Out Force and Microleakage of Screw Access Hole Filling Materials in Monolithic Zirconia Implant Crowns.
- Authors
Moilanen, Pauliina; Lassila, Lippo V. J.; Hjerppe, Jenni; Närhi, Timo O.; Lassila, Lippo Vj
- Abstract
<bold>Purpose: </bold>To test the push-out force and marginal leakage of different screw hole-sealing methods in monolithic zirconia implant crowns.<bold>Materials and Methods: </bold>Ninety monolithic zirconia (Prettau, Zirkonzahn) specimens were milled with two different screw access hole designs: conventional smooth hole or threaded screw hole (for group PMMA-SC), and divided into five groups (n = 18) according to filling method: unbonded composite (UBC); bonded composite (BC); airborne-particle abrasion of screw hole and unbonded composite (ABR-UBC); airborne-particle abrasion of screw hole and bonded composite (ABR-BC); and PMMA screw plugs (PMMA-SC). Twelve specimens per group were subjected to static push-out force with a universal testing machine. Before testing, 6 specimens per group were stored in dry conditions, and 6 were kept in water storage (+37°C) for 7 days. For the remaining specimens (n = 6), cotton pellets were placed under the screw access hole fillings, and the specimens were immersed in 0.5% basic fuchsin solution for 2 weeks. Dye in cotton pellets was dissolved in 2 mL of water, and absorbances of the solutions were measured with a spectrophotometer at 465 nm. Data are reported as mean and SD. Statistical analysis was made using a generalized linear model with logarithmic transformation.<bold>Results: </bold>PMMA-SC specimens showed the highest push-out forces (P < .0001) and lowest fuchsin penetration (P = .009). Airborne-particle abrasion increased the push-out force and decreased the microleakage in composite groups. The storage conditions affected the results of both unbonded groups.<bold>Conclusion: </bold>The design and sealing method of the screw access hole affect push-out force and microleakage.
- Subjects
MICROLEAKAGE (Dentistry); DENTAL screws; DENTAL crowns; DENTAL fillings; DENTAL implants; ZIRCONIUM oxide; DENTAL materials
- Publication
International Journal of Prosthodontics, 2022, Vol 35, Issue 2, p194
- ISSN
0893-2174
- Publication type
journal article
- DOI
10.11607/ijp.7445