Objective: To compare the fracture resistance and fracture performance of CAD/CAM zirconia and alloy crowns.
Method And Materials: One electrophoretic deposition alumina ceramic (Wolceram, Wolceram) and 4 zirconia-based systems (ce.novation, ce.novation; Cercon, DeguDent; Digizon, Amann Girrbach; and Lava, 3M ESPE) were investigated. A porcelain-fused-to-metal method (Academy, Bego Medical) was used in either conventional casting technique or laser sintering. Sixteen crowns of each material were fabricated and veneered with glass-ceramic as recommended by the manufacturers. Crown and root dimensions were measured, and 8 crowns of each system were adhesively bonded or conventionally cemented. After the crowns were artificially aged in a simulated oral environment (1,200,000 mechanical loads with 50 N; 3,000 thermal cycles with distilled water between 5 degrees C and 55 degrees C; 2 minutes per cycle), fracture resistance and fracture patterns were determined and defect sizes investigated.
Results: The fracture force varied between 1,111 N and 2,038 N for conventional cementation and between 1,181 N and 2,295 N for adhesive bonding. No significant differences were found between adhesive and conventional cementations. Fracture patterns presented mostly as a chipping of the veneering, in single cases as a fracture of the core, and in 1 case as a fracture of the tooth.
Conclusions: Crown material and cementation do not have any significant influence on the fracture force and fracture performance of all-ceramic and metal-based crowns. Therefore, it may be concluded that adhesive bonding is not necessary for the application of high-strength ceramics.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
In vivo bone regeneration performance of hydroxypropyl methylcellulose hydrogel-based composite bone cements in ovariectomized and ovary-intact rats: a preliminary investigation.
J Mater Sci Mater Med
January 2025
Department of Neurosurgery, College of Medicine, Soonchunhyang University, Bucheon Hospital, Bucheon, South Korea.
The objective of this study is to fabricate and develop hydroxypropyl methylcellulose (HPMC) hydrogel (HG)-based composite bone cements with incorporation of hydroxyapatite (HA), beta-tricalcium phosphate (β-TCP), and with/without polymethylmethacrylate (PMMA) for vertebroplasty. For animal study, twenty female Wister rats (250-300 g, 12 weeks of age) were divided into four groups including a two non-ovariectomy (NOVX) groups and two ovariectomy (OVX)-induced osteoporosis groups. Two prepared biocomposites including HG/β-TCP/HA and HG/β-TCP/HA/PMMA were injected into the tibial defects of both OVX and NOVX rats for evaluating in vivo osteogenesis after 12 weeks.
View Article and Find Full Text PDFHigh-velocity traumatic amputations of the proximal upper extremity are devastating to the patient and represent an extreme surgical challenge to the treatment team. The hand surgeon must simultaneously battle devascularization with timely microvascular anastomosis, gross contamination with meticulous debridement, and amputation with stable fixation. In restoring a functional extremity, many of these goals are in contention with each other.
View Article and Find Full Text PDFPercutaneous Pinning for Proximal Humerus Fractures: Insights From a Five-Year Retrospective Study.
Cureus
December 2024
Orthopaedics and Traumatology, University Hospital Galway, Galway, IRL.
Introduction: Proximal humerus fractures are a common orthopedic challenge, particularly in older adults. Percutaneous pinning, a minimally invasive technique, aims to stabilize fractures while preserving soft tissue integrity. This study evaluates the functional and radiological outcomes of patients treated with percutaneous pinning at a single center over five years.
View Article and Find Full Text PDFManagement of Ankle Fracture Wounds Using Urinary Bladder Matrix: A Case Report.
Cureus
December 2024
Orthopedic Surgery, King Fahad Medical City, Riyadh, SAU.
Ankle fractures, often accompanied by other injuries and complications, pose a significant healthcare burden due to their high incidence and associated treatment challenges. This case report investigates the use of Cytal™ Wound Matrix, derived from urinary bladder matrix (UBM), in managing postoperative complications following open reduction and internal fixation (ORIF) of a trimalleolar ankle fracture. A 57-year-old male with a history of hypertension sustained a trimalleolar ankle fracture following a road traffic accident.
View Article and Find Full Text PDFPeriprosthetic femoral fractures in minimally-invasive anterolateral short stem versus transgluteal straight stem cementless total hip arthroplasty: What are the differences in the femoral and pelvic morphology?
J Orthop Surg Res
January 2025
Department for Orthopedics and Traumatology, Kepler University Hospital GmbH, Krankenhausstrasse 9, 4020, Linz, Austria.
Background: The occurrence of periprosthetic femoral fractures (PFFs) in cementless total hip arthroplasty (THA) might be associated with the proximal femoral morphology and the pelvis. PFFs in short stem THA are associated with an increased Canal Flare Index. PFFs in straight stem THA show a decreased Canal Flare Index.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!