Introduction: Population aging and total edentulism are two interrelated factors. The United Nations department of public information states that the world population by 2015 was 7.3 billion people and the World Health Organization states that 26% of adults over the age of 74 will have lost all their permanent teeth, we are facing a public health problem that can be solved by using dental implants. Total fixed rehabilitations on implants are very well documented in the scientific literature. Various types of prosthetic materials may be used such as metalloacrylic, metallocomposite and metaloceramic. The most frequent complications of this type of oral rehabilitation are the fracture of the acrylic teeth, wear of the natural antagonist teeth, ceramic chippings, lack of passivity and repairs of fractured metal structures.
The use of zirconia for the execution of superstructures is a more recent modality of treatment. Rehabilitation in zirconia has been increasing in popularity due to its excellent mechanical and biological properties. Zirconia structures with cutback and subsequent application of ceramics often have frequent chippings. In order to find a solution, monolithic multilayer zirconia blocks have been developed to perform one piece fixed implant restorations. With this improvement it is expected reduction of fractures obtaining more esthetic fixed prostheses with high resistance and minimum occlusal adjustments.
Purposes: This retrospective study has as main objective to evaluate the clinical performance of the full arch rehabilitation on implants using monolithic zirconia Noritake Katana Kuraray ML®. The secondary objectives are the evaluation of the average weight of each structure in zirconia, influence of the distal cantilever as a risk factor in the fracture of the structure in each dental arch, incisal edge chippings, fracture of cusps or zirconia structure, evaluation of the level of wear of the antagonistic arches and dicementation of the titanium interfaces of the zirconia structure.
Materials and Methods: Clinical data collection of the full arch implant restorations carried out in the scope of the 5th, 6th and 7th Editions of Postgraduate Course in Oral Implantology at Cespu Clinic – Famalicão Unit – Portugal.
Clinical data were extracted meeting the data protection requirements of patients routinely treated in this course. The present study was performed in 21 patients in a total of 29 dental arches, C1 MIS® and Straumann BLT® implants were placed and restored with monolithic Zirconia Noritake Katana Kuraray® ML using Wieland® milling machine. In 1 arch were placed 4 straight implants, 19 arches were placed 4 implants by the All-on-4 technique, however 9 arches received 6 implants. Patients age ranged from 32 to 77 years and the follow-up time was from 6 to 38 months. The data collection form was completed and informed consent was signed by all patients involved in this study. All edentulous patients were treated following the same clinical protocol and all rehabilitations were performed by the same dental technician. Radiographic records include initial panoramic x-ray and computerized axial tomography, postoperative and final panoramic x-ray plus periapical x-ray were also taken using RVG Owandy®. During the annual follow-up panoramic x-ray and periapical x-ray were taken. Finally, the performance of the fixed full arch screw-retained monolithic zirconia rehabilitation was evaluated in all patients.
Results: In this study, 76% of the patients treated with monolithic zirconia did not have any type of complications, 6,9% presented antagonistic wear, 10,3% presented minor multi-unit abutment loosening, 3,4% presented minor prosthetic screw loosening and 3,4% had a fracture of the structure.
Conclusion: The monolithic zirconia Noritake Katana® multilayer ML milled in Wieland® Cad-Cam to perform the fixed rehabilitation of total edentulous arches is a valid treatment option. Featuring a success rate of 96,6%. The result in this study show a high success rate in terms of function, aesthetics and phonetics achieving high patient satisfaction.
Keywords:Monolithic Zirconia; Zirconia Supra-Structure; Tetragonal Polycrystalline Zirconia Stabilized y-ztp; Fracture; Zirconia Prostheses

The temporomandibular joint is the most complex in the body; hence diseases related to it should be given special attention. Meanwhile, due to the higher vulnerability of children, the problems of this joint in children are more important. This review aims to find the relationship between occlusion and temporomandibular joint disorders in Iranian children and adolescents.
Keywords:Temporomandibular Joint Disorder; Occlusion; Children and Adolescents

An unnerving subject of the year 2020 was the pandemic of COVID-19 (Coronavirus) has affected day to day life and is slowing down the global economy. The COVID-19 pandemic has led to a dramatic loss of human life worldwide and presents an unprecedented challenge to all aspects of existence. As no area of society has left untouched with the effect of this pandemic, including dentistry; knowing the mode of entry, mainly oral and nasal cavity, dentists and dental procedures are considered at high risk in the chain of covid spread. Dental societies and healthcare communities around the globe developed various protocols and algorithms with standard infection control protocols. The aim of this review is to highlight the transformation the field of dentistry has undergone using its existing protocol and technologies, in what can only be called the new normal of today.
Keywords: COVID-19; Dentistry; Dental Societies; Healthcare Communities

Botulinum toxin type A is a drug with therapeutic purpose, initially used by Ophthalmology, indicated in cases of blepharospasms. However, botulinum toxin has achieved fame and success in aesthetic applications. In Dentistry, the toxin has been indicated for gummy smile; parafunctional habits such as bruxism and brychism; masseteric hypertrophy; trismus; temporomandibular dysfunctions; adjuvant in surgical procedures such as arthrocentesis or in Implant Dentistry, favoring the osseointegration period by reducing masticatory forces, avoiding the fracture of prostheses and implants; orofacial and oromandibular dystonia; facial paralysis; sialorrhea. Also indicated in orofacial pain, it presents the same protocol for aesthetic applications, taking care to avoid applications that cause asymmetric, non-esthetic, and artificial results. The purpose of this article is to present the case of a patient who presented headache, with painful symptoms in the glabellar and frontal regions. The patient received botulinum toxin applications for painful symptomatology, without, however, altering her facial aesthetics, achieving improvement in pain, self-esteem and quality of life.
Keywords:Botulinum Toxins Type A; Orofacial Pain; Esthetics; Dentistry

Pleomorphic adenoma is a salivary gland neoplasm frequently observed in the dental clinic. It is more common in young adults, although usually diagnosed between the 3rd and 5th decades of life. One of the main characteristics is the diversity of the histopathological and morphological pattern. Clinically, it is characterized as a firm, slowly growing, painless mass. However, in some cases, it may simulate other lesions, including oral cancer. The purpose of this article is to report a case of pleomorphic adenoma on the palatal mucosa of a 55-years-old patient, mimicking an oral cancer. The excisional biopsy was performed and the lesion was diagnosed as pleomorphic adenoma. The patient has been followed by 5 years, with no signs of recurrence.
Keywords:Pleomorphic Adenoma; Salivary Gland Neoplasms; Minor Salivary Glands; Oral Surgery; Oral Diagnosis