Zirconia crowns cemented on titanium bars using CAD/CAM: a five-year follow-up prospective clinical study of 9 patients

Abstract

Background: The purpose of this prospective clinical study was to evaluate clinical results of the passive fit of the substructure in the Toronto bridge and the chipping or delamination of the ceramic veneering on the zirconiasupport, after 5 years, in nine patients rehabilitated with zirconia crowns cemented on titanium bars using CAD/ CAM technology. Methods: A total of nine healthy patient fully edentulous in the upper and lower jaws with non-contributory past medical anamnesis needing full fixed total prosthesis maxilla and mandible were included in this clinical study, where a total 9 mandibles and 9 jaws were treated. The inclusion criteria in order for a patient to participate in the study were: a signed consent form, fully edentulous in the upper and lower jaws, required a full fixed total prosthesis restoration. The exclusion criteria were age limitation of less than 18 years old, chemotherapy, head and neck radiation therapy, diabetes or periodontal disease, smoking and severe illness. All patients received zirconia crowns cemented on titanium bars using CAD/CAM technology. The primary outcome of this study was to examine the survival rate of the zirconia crowns cemented on titanium bars using CAD/CAM technology during the observation period. Any chipping or delamination of the zirconia crowns of the restorations was considered as failure. The secondary outcome was to evaluate the passive fit of the substructure on the implants, loose of occlusal screws, implant survival and satisfactory occlusion. Results: In 5 years of follow-up no evidence of chipping or delamination of the ceramic veneering on the zirconia crown supported were observed. Fifteen finished protesis (93.75%) showed satisfactory occlusion and only one case (6.25%) required significant occlusal adjustment. During the first year recall all bars were stable (100%) no mobility of protheses was recorded. After 5 years all bars were stable (100%) and no mobility of protheses was recorded. Conclusion: The computerized workflow for the process of building bar and prosthesis ensures reproducible results and excellent adaptation and passive insertion of them, as well as conditions for avoiding mechanical complications and guarantees stability of screw-implant abutments.

Infrared Thermographic Evaluation of Temperature Modifications Induced during Implant Site Preparation with Steel vs. Zirconia Implant Drill

“…Zirconium dioxide or zirconia is a good material used in implantology for its biocompatibility as well as physical and aesthetic properties [25,26]. In clinical practice, it zirconia is used for implant abutments and superstructures because of its durability, strength, corrosion resistance, and response to disinfection and sterilizing agents [25].…”

İmplant Destekli̇ Hi̇bri̇t Protezleri̇n Yapiminda Kullanilan Materyaller Ve Üreti̇m Yöntemleri̇

“…Simante Edilen Köprü Protezlerinin Kombinasyonu (Toronto Köprüler) Literatürde "Toronto köprü protezleri" olarak geçen, CAD/CAM frezeleme yöntemiyle üretilen ve implantlara vida ile retansiyonu sağlanan titanyum dayanak alt yapılar üzerine tek veya çoklu üniteler halinde simante edilen kron protezlerinden oluşan hibrit overdenture protezlerle başarılı sonuçların elde edildiği vakalar yer almaktadır 54 .…”

The Effects of Liquid Disinfection and Heat Sterilization Processes on Implant Drill Roughness: Energy Dispersion X-ray Microanalysis and Infrared Thermography

“…Zirconia is a good material used in implantology for its good aesthetic properties and biocompatibility [2]. In dentistry, zirconia is largely used for implant abutment and superstructure production [3] because of its strength, durability, corrosion resistance and response to disinfection and sterilizing agents [4].…”