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J Dent 2021 Jun 9:103721. Epub 2021 Jun 9.

Clinic for Restorative Dentistry, University of Zurich, Switzerland. Electronic address:

Objectives: The aim of this retrospective clinical study was to investigate the survival rate, technical and biologic complications of leucite-reinforced glass-ceramic crowns after a follow-up time of 13-15 years.

Material And Methods: Fifty-three patients with 131 crowns were invited to the follow-up visit. The reconstructions were re-examined clinically and radiographically using the modified USPHS criteria and periodontal parameters of probing pocket depth (PPD), plaque index (PI), sulcus bleeding index (SBI). Read More

J Clin Transl Res 2021 Feb 21;7(1):72-76. Epub 2021 Jan 21.

Conservative Dentistry and Endodontics, Narayana Dental College and Hospital. Chintareddypalem, Nellore, India.

Background: Irrigating solutions used for the elimination of microorganisms during root canal preparation affect the chemical and physical properties of dentin, thereby rendering the tooth more prone to fracture. Therefore, the careful and judicious selection of irrigant is required which has maximum benefits with minimum undesirable properties.

Aim: The study aimed to compare and evaluate the effect of Chloroquick with composition of 18% etidronic acid+ 5% sodium hypochlorite (NaOCl) with other irrigants such as Triphala, NaOCl, and ethylenediaminetetraacetic acid (EDTA) on the microhardness of root canal dentin. Read More

Equine Vet J 2021 Jun 1. Epub 2021 Jun 1.

Royal Veterinary College, Equine Referral Hospital, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire, AL9 6TA, UK.

Background: Sagittal fractures of equine cheek teeth are commonly observed during oral examination. There are few reports on the apical and endodontic pathology associated with such fractures seen during computed tomographic (CT) examination.

Objectives: To document the prevalence of CT changes indicative of apical disease in equine cheek teeth which have suffered a sagittal fracture involving the clinical +/- reserve crown. Read More

Front Vet Sci 2021 13;8:677680. Epub 2021 May 13.

Dentistry and Oral Surgery Department, Small Animal Clinic, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia.

Fractured canine teeth (especially maxillary canine teeth) are common in domestic ferrets (). We evaluated (detailed oral/dental and radiographic examination under general anesthesia) 18 domestic ferrets affected by 23 complicated crown fractures of periodontally healthy permanent maxillary canine teeth over a 2-year period. Average age of the ferrets at the time of diagnosis was 2. Read More

Int J Dent 2021 8;2021:5590911. Epub 2021 May 8.

Department of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.

Aim: This study aimed to evaluate the effects of various restorative techniques on the fracture resistance of pulpotomized premolars with mesioocclusodistal (MOD) cavities treated with mineral trioxide aggregate (MTA) or calcium enriched mixture (CEM) cement.

Materials And Methods: One hundred and eight sound extracted maxillary premolars were randomly assigned to nine experimental groups ( = 12). The teeth in group 1 did not receive any preparation. Read More

Clin Oral Implants Res 2021 May 25. Epub 2021 May 25.

Clinic of Conservative and Preventive Dentistry Periodontology and Cariology, Center of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland.

Objectives: To assess the mechanical stability of implants after implantoplasty and thermocyclic loading, the residual thickness of the instrumented areas and neighbouring tooth injury due to implantoplasty.

Materials And Methods: Using a phantom head simulator and maxillary model implants were subjected to an implantoplasty procedure. Thirty implants were randomly assigned to receive one of three instrumentation sequences. Read More

J Endod 2021 Jun 18;47(6):852-861. Epub 2021 May 18.

Oral and Maxillofacial Surgery, University Hospital Copenhagen, Copenhagen, Denmark.

The life and professional contributions to dental traumatology of Dr Jens Ove Andreasen are described in terms of his research, writing, teaching, and leadership. Read More

Int Endod J 2021 May 18. Epub 2021 May 18.

Department of Oral Diagnosis, Division of Oral Radiology, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil.

Background: The effectiveness of the Metal Artefact Reduction (MAR) tool for the detection of vertical root fracture (VRF) by Cone-Beam Computed Tomography (CBCT) images is controversial.

Objective: To evaluate the effectiveness of the MAR tool on VRF detection involving teeth with intracanal materials in CBCT images.

Methodology: In September 2019, an electronic search was performed in six databases (PubMed, Scopus, Web of Science, Cochrane, Lilacs, and Embase). Read More

J Endod 2021 May 14. Epub 2021 May 14.

Department of Endodontics, University of Queensland, School of Dentistry, Brisbane, Queensland, Australia. Electronic address:

Introduction: Separated endodontic instruments may adversely affect the outcome of endodontic treatment. The combination of ultrasonic techniques and dental operating microscopes appears to be effective in the removal of separated instruments compared with more randomized techniques. This study evaluated the roles of root canal curvature and separated instrument length on the time needed to loosen and retrieve the instrument fragments. Read More

Compend Contin Educ Dent 2021 Apr;42(4):g1-g4

Faculty Member, Advanced Education in General Dentistry Residency Program, University of Cincinnati Medical Center; Private Practice limited to Periodontics and Dental Implants, Milford, Ohio; Diplomate, American Board of Periodontology; Diplomate, International Congress of Oral Implantologists.

Fixed prostheses offer various advantages over conventional removable devices for immediate restoration of a fractured tooth in the esthetic zone. In this case report, a fixed solution is employed through the use of a same-day provisional restoration attached to an immediately placed dental implant. Utilizing biologics and an implant system that allows for excellent primary stability, this treatment modality offers a predictable method for achieving immediate implant placement and provisionalization. Read More

BMC Pediatr 2021 05 3;21(1):214. Epub 2021 May 3.

Department of Health and Social Behavior, Graduate School of Medicine, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-0033, Japan.

Background: Children's healthy development is important. While governmental public assistance benefits financially troubled families, it cannot compensate for a lack of social support. Single-parenthood is a health risk factor for children owing to low-income-associated food insecurity and stress. Read More

Eur J Prosthodont Restor Dent 2021 Apr 19. Epub 2021 Apr 19.

Professor, University of Zürich, Division of Dental Biomaterials, Center for Dental and Oral Medicine, Clinic for Reconstructive Dentistry, Zürich, Switzerland.

Objective: Despite the increased popularity of endocrowns, there is no clear consensus considering their effectiveness to restore severely-destructed endodontically treated premolars. This study aimed to assess the biomechanical behavior of endodontically treated maxillary first premolars restored with a novel endocrown system compared to the conventional one.

Materials And Methods: Twenty sound human maxillary first premolars were collected. Read More

Materials (Basel) 2021 Apr 21;14(9). Epub 2021 Apr 21.

Advanced Operative Dentistry-Endodontics, The Nippon Dental University Graduate School of Life Dentistry at Niigata, Niigata 951-8580, Japan.

The purpose of this study was to examine the effects of combining specific adhesive materials and various surface treatments on bonding durability and microleakage of vertically fractured roots. Adhesive models were prepared using bovine lower incisors. The experiment included the following five groups: SB-G group (control) (10% citric acid with 3% ferric chloride solution (10-3 solution) + an adhesive resin cement (4-META/MMA-TBB; Super-Bond)), EC group (self-cure bonding agent (UB) + core composite resin (EC)), EC-G group (10-3 solution + UB + EC), EC-P group (40% phosphate solution + UB + EC), and EC-E group (18% ethylenediaminetetraacetic acid (EDTA) solution + UB + EC). Read More

Oral Maxillofac Surg 2021 Apr 28. Epub 2021 Apr 28.

Department of Oral and Maxillofacial Diseases, University of Helsinki and Helsinki University Hospital, 00029, Helsinki, Finland.

Purpose: Dental injuries (DIs) are associated with facial fractures, particularly mandibular fractures. As paediatric mandibular fractures have special features, we sought to clarify the occurrence and types of DIs among this patient group. We assessed how age, injury type, and fracture location affects the occurrence of DIs and thereby defined which patients are most susceptible. Read More

J Conserv Dent 2020 Sep-Oct;23(5):538-542. Epub 2021 Feb 10.

Specialty in Aesthetic, Cosmetic, Restorative, and Implantological Dentistry, Faculty of Stomatology, Autonomous University of San Luis Potosí, San Luis Potosí, México.

This clinical report describes the rehabilitation procedure of an upper central tooth with a coronal fracture without compromising the root. The treatment plan consisted of the reinsertion of the fractured fragment as a definitive cemented biological restoration. Due to the deficient remnant, a fiber-reinforced composite post was used. Read More

Dent Mater 2021 Apr 25. Epub 2021 Apr 25.

Department of Clinical Dentistry, Faculty of Medicine, University of Bergen, Norway.

Objective: Monolithic zirconia crowns have become a viable alternative to conventional layered restorations. The aim of this study was to evaluate whether the taper, and thus wall thickness, of the abutment or pre-defined cement space affect the fracture resistance or fracture mode of monolithic zirconia crowns.

Methods: A model tooth was prepared with a taper of 15° and a shallow circumferential chamfer preparation (0. Read More

Gen Dent 2021 May-Jun;69(3):46-51

This study aimed to compare the effects of different combinations of adhesive bases and restorative materials on the fracture strength and mode of maxillary premolars with mesio-occlusodistal (MOD) cavities after mineral trioxide aggregate (MTA) pulpotomy. Ninety-six extracted human maxillary premolars were divided into 8 groups (n = 12). Group 1 (negative control) consisted of intact teeth. Read More

Gen Dent 2021 May-Jun;69(3):37-41

This in vitro study aimed to evaluate the influence of endodontic irrigation solutions and resin sealing of the dentin surfaces of the cavity before irrigation on the fracture strength (FS) of maxillary premolars. Seventy-two human maxillary premolars were randomly assigned to 6 groups (n = 12). Group 1 consisted of intact teeth that served as negative controls. Read More

J Contemp Dent Pract 2020 Dec 1;21(12):1374-1378. Epub 2020 Dec 1.

Department of Medical Biotechnologies, Unit of Endodontics and Restorative Dentistry, University of Siena, Siena, Italy.

Aim And Objective: The present study compared the fracture strength and failure pattern of endodontically treated, bi-rooted, maxillary premolars with different number of coronal walls and postendodontic restoration (one vs double post).

Materials And Methods: 105 premolars were divided into 3 groups according to the number of residual walls: control group (intact teeth; = 15), group 1 (3 residual walls; = 45), group 2 (2 residual walls; = 45). Each test group was then divided into 3 subgroups ( = 15 each) according to postendodontic restoration: no post (A), 1 post (B) or 2 posts (C). Read More

Dent Res J (Isfahan) 2020 Nov-Dec;17(6):417-423. Epub 2020 Dec 10.

Department of Dentistry, School of Dentistry, Wyden Educational Group - FACID WYDEN, Teresina, Piauí, Brazil.

Background: Endodontically treated teeth with extensive structural damage present higher fragility due to the low amount and worse quality of the reminiscent tissues of the crown.

Materials And Methods: The present study evaluated the effect of different intraradicular retainers and cementation agents on the fracture resistance of devitalized teeth. Incisive teeth ( = 40) of bovine mandibles were used. Read More

Dent Traumatol 2021 Apr 21. Epub 2021 Apr 21.

Social and Pediatric Dentistry Department, Faculty of Dentistry, Assistance and Research Center on Traumatic Dental Injuries for Children and Adolescents, Federal University of Bahia, Salvador, Brazil.

Root fractures vary in severity, extent, and location, according to the physical and mechanical aspects of the accident. Root fractures are rare in primary teeth and they affect dentin, cementum, periodontal ligament and the pulp. This paper reports a case of a two-and-a-half-year-old baby who had a root fracture of the upper right primary central incisor (tooth 51) as a consequence of trauma that was managed with minimally invasive intervention. Read More

Beijing Da Xue Xue Bao Yi Xue Ban 2021 Mar;53(2):384-389

Department of Oral Emergency, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China.

Objective: To analyze the etiological and clinical characteristics of oral emergency patients under 18 years with dental trauma, and to provide guidance on the prevention and treatment in children and adolescents.

Methods: A retrospective study on the intact data of the dental trauma patients under 18 years from January 2016 to December 2018 in the Department of Oral Emergency in Peking University School of Stomatology was conducted, and the distribution of the patients' gender, age and visiting time, as well as the number and position of traumatic teeth, diagnostic classification, and multiple injury with dental trauma were analyzed.

Results: During the period, 54. Read More

J Oral Biosci 2021 Jun 18;63(2):104-110. Epub 2021 Apr 18.

Department of Periodontology, Rajah Muthiah Dental College & Hospital, Annamalai University, Annamalai Nagar, Chidambaram, 608002, Tamil Nadu, India. Electronic address:

Background: Periodontitis is a highly prevalent inflammatory disease affecting the periodontium that results from an imbalance between periodontopathogens and host mechanisms. Continuous progression of the disease may lead to tissue and bone destruction, eventually resulting in tooth loss. The extent of bone loss depends on the dysregulated host immune response. Read More

J Endod 2021 Apr 20. Epub 2021 Apr 20.

Division of Oral Radiology, Department of Oral Diagnosis, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil.

Introduction: The purpose of this preliminary study was to evaluate the diagnostic accuracy of the combined use of 2 cone-beam computed tomographic (CBCT) volumes obtained with the tooth of interest positioned at different orientations in the detection of vertical root fracture (VRF).

Methods: Thirty single-rooted teeth were divided into 2 main groups (n = 15): control and with VRF. The teeth were individually placed in a phantom composed of a human skull and mandible, which was CBCT scanned in 2 spatial orientations: conventional (with the Frankfurt plane parallel to the floor) and angled acquisition (tilted 90° backward). Read More

Int Endod J 2021 Apr 14. Epub 2021 Apr 14.

Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, USA.

Aim: To simulate in a laboratory setting longitudinal cracking in root filled premolar teeth, using cyclic mechanical fatigue.

Methodology: Mesial-occlusal-distal (MOD) cavities were prepared in twenty root filled, single-rooted, mandibular premolars restored with fibre posts and resin composites. The samples were randomly divided into two groups based on the loading approaches: static loading with a crosshead speed of 0. Read More

Niger J Clin Pract 2021 Apr;24(4):505-510

Department of Restorative Dentistry, Faculty of Dentistry, King Abdulaziz University, Jeddah, Saudi Arabia.

Objective: To evaluate the effect of varying ferrule height and distribution on the fatigue resistance and fracture strength of endodontically treated premolars.

Materials And Method: Thirty-two extracted human premolars were endodontically treated and prepared to receive all-ceramic crowns. Teeth were randomly divided into two groups. Read More

J Contemp Dent Pract 2020 Nov 1;21(11):1201-1204. Epub 2020 Nov 1.

Department of Conservative Dentistry, Faculty of Dentistry, Universitas Sumatera Utara, Medan, Sumatera Utara, Indonesia.

Aim: This study aims to evaluate the difference in fracture resistance of the short fiber-reinforced composite (SFRC) thickness as intermediate layer of class II composite restoration.

Materials And Methods: Thirty human maxillary premolars were selected and divided into three groups. In groups I, II, and III, class II cavities were prepared. Read More

BMC Oral Health 2021 04 12;21(1):190. Epub 2021 Apr 12.

Nordic Institute of Dental Materials (NIOM), Oslo, Norway.

Background: Stainless-steel crowns (SSCs) are recommended for restorative treatment of young teeth severely affected by caries, fractures or dental developmental disorders (DDDs). However, despite recommendations and clinical evidence, SSCs are not widely used by general dentists, who favour extraction and more conventional restorations. The present study aimed to investigate the views of and use of SSCs among Norwegian and Finnish dentists. Read More

J Mech Behav Biomed Mater 2021 07 27;119:104385. Epub 2021 Mar 27.

Dept. of Operative and Preventive Dentistry, Charité - Universitätsmedizin Berlin, Aßmannshauserstraße 4-6, 14197, Berlin, Germany.

Objectives: The aim of this study was to assess the fatigue loading behavior and fracture resistance of endodontically treated teeth restored with adhesively luted bundled fiber posts in comparison to solid fiber posts. Image analysis (2D and 3D) was applied to evaluate modes of failure and to characterize susceptible parts of the post-and-core interface.

Method: Crowns of 72 human similar-sized central upper incisors were removed and roots received a conventional root canal filling prior to establishing 4 groups of core build-up: No Post group (nP) received a 4 mm deep filling made of composite inside the canal with no dental post, fiber post group (FP) received a conventional solid post, and two experimental groups received bundles of 6 (FB6) or 12 (FB12) 0. Read More

Animals (Basel) 2021 Mar 4;11(3). Epub 2021 Mar 4.

Unit of Veterinary Anatomy and Embryology, Department of Anatomy, Animal Production and Clinical Veterinary Sciences, Faculty of Veterinary Sciences, Campus of Lugo-University of Santiago de Compostela, 27002 Lugo, Spain.

The cat mandible is relatively small, and its manipulation implies the use of fixing methods and different repair techniques according to its small size to keep its biomechanical functionality intact. Attempts to fix dislocations of the temporomandibular joint should be primarily performed by non-invasive techniques (repositioning the bones and immobilisation), although when this is not possible, a surgical method should be used. Regarding mandibular fractures, these are usually concurrent with other traumatic injuries that, if serious, should be treated first. Read More