Repair Bond Strength of Conventionally and Digitally Fabricated Denture Base Resins to Auto-Polymerized Acrylic Resin: Surface Treatment Effects In Vitro

Abstract

Denture base fracture is one of the most annoying problems for both prosthodontists and patients. Denture repair is considered to be an appropriate solution rather than fabricating a new denture. Digital denture fabrication is widely spreading nowadays. However, the repair strength of CAD-CAM milled and 3D-printed resins is lacking. This study aimed to evaluate the effect of surface treatment on the shear bond strength (SBS) of conventionally and digitally fabricated denture base resins. One l heat-polymerized (Major base20), two milled (IvoCad, AvaDent), and three 3D-printed (ASIGA, NextDent, FormLabs) denture base resins were used to fabricate 10 × 10 × 3.3 acrylic specimens (N = 180, 30/resin, n = 10). Specimens were divided into three groups according to surface treatment; no treatment (control), monomer application (MMA), or sandblasting (SB) surface treatments were performed. Repair resin was bonded to the resin surface followed by thermocycling (5000 cycles). SBS was tested using a universal testing machine where a load was applied at the resin interface (0.5 mm/min). Data were collected and analyzed using ANOVA and a post hoc Tukey test (α = 0.05). SEM was used for failure type and topography of fractured surfaces analysis. The heat-polymerized and CAD-CAM milled groups showed close SBS values without significance (p > 0.05), while the 3D-printed resin groups showed a significant decrease in SBS (p < 0.0001). SBS increased significantly with monomer application (p < 0.0001) except for the ASIGA and NextDent groups, which showed no significant difference compared to the control groups (p > 0.05). All materials with SB surface treatment showed a significant increase in SBS when compared with the controls and MMA application (p < 0.0001). Adhesive failure type was observed in the control groups, which dramatically changed to cohesive or mixed in groups with surface treatment. The SBS of 3D-printed resin was decreased when compared with the conventional and CAD-CAM milled resin. Regardless of the material type, SB and MMA applications increased the SBS of the repaired resin and SB showed high performance.

Surface Modification Methods of Self-Cured Acrylic Resin Repaired with Resin Composite Using a Universal Adhesive

“…It has been suggested that a variety of micromechanical surface modification techniques and chemical surface treatment through adhesive systems can improve the ability to repair bonds in acrylic resin repaired using resin composite [16][17][18]. Additionally, surface treatment of acrylic resin with MMA (methyl methacrylate) has been shown to enhance the bonding ability of acrylic resin when repaired with resin composite [5,[19][20][21][22][23].…”

Application of digital technologies to prosthetic rehabilitation of patients after surgical treatment of head and neck neoplasms.

“…Podczas frezowania dochodzi do strat materiału, w przeciwieństwie do druku 3D, który jest procesem bardziej wydajnym, pozwalającym na pozyskiwanie większych obiektów o dowolnym kształcie. 1,12,19,20 Szeroko opisywane w piśmiennictwie jest wykorzystanie metod cyfrowych do projektowania i wytwarzania stałych uzupełnień protetycznych, komponentów implantologicznych, takich jak: szablony, indywidualne łączniki czy elementy precyzyjne, oraz coraz częściej również uzupełnień ruchomych. 1,21,22 Po resekcji tkanek w zakresie podniebienia wskazane jest jak najszybsze uzupełnienie powstałego ubytku w celu przywrócenia funkcji i poprawy jakości życia.…”

“…Zastosowanie monomeru zwiększało siłę wiązania w próbkach polimeryzowanych termicznie i frezowanych, natomiast wszystkie materiały poddane piaskowaniu wykazywały wyższą siłę wiązania z materiałem do naprawy. 20 W badaniach przeprowadzonych przez Awad i wsp. oceniano między innymi siłę wiązania elastycznych (Coe Soft, GC, Japonia i PermaSoft, Dentsply Sirona, USA) i twardych (Tokuyama Rebase II, Tokuyama Dental, Japonia; Kooliner, GC, Japonia i ProBase Cold, Ivoclar Vivadent, Liechtenstein) materiałów do podścielania protez z materiałami na płyty protez frezowanymi (IvoBase CAD, Ivoclar Vivadent, Liechtenstein) i drukowanymi (Denture Base LP Resin; Formlabs Inc, USA).…”

In vitro comparative study of red blood cell and VWF damage on 3D printing biomaterials under different blood-contacting conditions

“…Among them, acrylic, PCISO, and Somos EvoLVe 128 are often used in medical fixtures and injection instruments while stainless steel is commonly used in body implantable devices. 14–18…”

“…Among them, acrylic, PCISO, and Somos EvoLVe 128 are often used in medical fixtures and injection instruments while stainless steel is commonly used in body implantable devices. [14][15][16][17][18] The average shear stress of the normal circulatory system in the human body is approximately 1-7 Pa. [19][20][21][22][23] To exclude the blood damage caused by supraphysiological shear stress, the two experimental platforms in this study were controlled within the range of physiological shear stress. In addition, most of the previous studies only focused on blood damage induced by materials in a static state.…”