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World J Clin Cases 2021 Apr;9(12):2944-2950

Department of Prosthodontics, The Affiliated Hospital of Stomatology, School of Stomatology, Zhejiang University School of Medicine, Key Laboratory of Oral Biomedical Research of Zhejiang Province, Hangzhou 310006, Zhejiang Province, China.

Background: Several previous studies have reported an unusual root formation in which a fractured apical fragment of an immature root continued to develop independent of the main root after trauma to an immature tooth. To date, there have been only rare reports of the continuing apical formation of the fractured root associated with dens evaginatus (DE). This paper presents a case of a separated root tip formation associated with a fractured tubercle of DE. Read More

Dent Mater 2021 May 6. Epub 2021 May 6.

Minnesota Dental Research Center for Biomaterials and Biomechanics (MDRCBB), School of Dentistry, University of Minnesota, MN, USA. Electronic address:

Objective: This study aimed to evaluate the effect of different chamfer preparations on the load capacity of reattached fractured incisors under lingual loading.

Methods: Eighty #8 typodonts were randomly assigned to four groups (n = 20 each). They were sectioned to simulate crown fracture, and reattached with a self-etch adhesive and a resin composite. 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

Dent Traumatol 2021 May 1. Epub 2021 May 1.

Department of Oral and Maxillo-Facial Surgery, Resource Center for Rare Oral Diseases, University Hospital (Rigshospitalet, Copenhagen, Denmark.

Background/aim: Long-term splinting of teeth with intra-alveolar root fractures has been considered important for the deposition of hard tissue between the root fragments. The aim of this study was to compare the healing outcomes in teeth with intra-alveolar root fractures relative to splinting times in three dental centers in Scandinavia, using historical data.

Materials And Methods: A total of 512 maxillary and mandibular incisors from three dental trauma centers were included in the study. Read More

J Clin Pathol 2021 Apr 30. Epub 2021 Apr 30.

Department of Biochemical Genetics, Children's Health Ireland at Temple Street, Dublin, Ireland.

Hypophosphatasia (HPP) is a group of inherited disorders characterised by the impaired mineralisation of bones and/or teeth and low serum alkaline phosphatase (ALP) activity. It is caused by a mutation in the ALPL gene encoding the tissue-non-specific isoenzyme of ALP (TNSALP) resulting in a loss of function. The disease is highly heterogenous in its clinical expression ranging from stillbirth without mineralised bone to the mild form of late adult onset with symptoms and signs such as musculoskeletal pain, arthropathy, lower-extremity fractures, premature loss of teeth or an incidental finding of reduced serum ALP activity. Read More

J Maxillofac Oral Surg 2021 Jun 19;20(2):328-329. Epub 2020 Apr 19.

College of Dentistry, King Khalid University, Guraiger, Abha, 62529 Kingdom of Saudi Arabia.

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

Dent J (Basel) 2021 Apr 1;9(4). Epub 2021 Apr 1.

Department of Conservative Dentistry and Endodontics, University of Cagliari, 09125 Cagliari, Italy.

As a result of a skiing accident, a ten-year-old girl suffered combined injuries to both maxillary central incisor teeth (#1.1 and #2.1). 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

Int Endod J 2021 Apr 27. Epub 2021 Apr 27.

Department of Conservative Dentistry & Endodontics, Postgraduate Institute of Dental Sciences (PGIDS) Rohtak, Haryana, India.

Aim: To compare the diagnostic accuracy of periapical radiography (PR) and cone beam computed tomography (CBCT) in detecting pathoses of endodontic origin using the gold standard of direct surgical visualization.

Methodology: Seventy-four patients (112 teeth) underwent radiographic examination by periapical radiography and CBCT. Presence of periapical lesions, root perforations and their locations, root fractures, different types of external root resorptive defects, apicomarginal bone defects, through and through bone defects, buccal bone status and proximity of root apices and lesions to vital anatomical structures were assessed. Read More

Bone Res 2020 Apr 26;8(1):19. Epub 2020 Apr 26.

State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi International Joint Research Center for Oral Diseases, Center for Tissue Engineering, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, Shaanxi, China.

The loss-of-function mutations in the ALPL result in hypophosphatasia (HPP), an inborn metabolic disorder that causes skeletal mineralization defects. In adults, the main clinical features are early loss of primary or secondary teeth, osteoporosis, bone pain, chondrocalcinosis, and fractures. However, guidelines for the treatment of adults with HPP are not available. Read More

J Endod 2021 Apr 20. Epub 2021 Apr 20.

National Dental Care Center for Persons with Special Needs, Seoul National University Dental Hospital, Seoul, Republic of Korea; Department of Conservative Dentistry, Dental Research Institute, Seoul National University Dental Hospital, Seoul National University School of Dentistry, Seoul, Republic of Korea. Electronic address:

This case reports a 46-year-old male with end-stage renal disease and internal resorption (IR) affecting multiple posterior teeth. IR involves odontoclast's removal of dentine within pulp chambers and root canal space. Typically, asymptomatic until detected on radiographs, IR is relatively rare so that etiology and pathogenesis are poorly understood. 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

J Oral Biosci 2021 Apr 17. Epub 2021 Apr 17.

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

Int J Dent 2021 24;2021:6697587. Epub 2021 Mar 24.

Department of Restorative and Prosthetic Sciences, College of Dentistry, King Saud Bin Abdulaziz University for Health Sciences, Riyadh, Saudi Arabia.

This study aimed at assessing the performance of Reciproc Blue (RB) and XP Endo Shaper (XPS), used for canal retreatment on extracted teeth, in terms of debris extrusion and obturating materials removal. Thirty mandibular premolars were prepared to ProTaper X2 file, obturated using warm vertical compaction, and then incubated for 28 days at 100% humidity at 37°C. Teeth were randomly assigned into two groups, according to the system used for retreatment (RB and XPS). Read More

Imaging Sci Dent 2021 Mar 29;51(1):55-62. Epub 2021 Jan 29.

Department of Stomatological Sciences, School of Dentistry, Federal University of Goiás, Goiânia, Goiás, Brazil.

Purpose: This study evaluated the influence of a metal artifact reduction (MAR) tool in a cone-beam computed tomography (CBCT) device on the diagnosis of vertical root fractures (VRFs) in teeth with different root filling materials.

Materials And Methods: Forty-five extracted human premolars were classified into three subgroups; 1) no filling; 2) gutta-percha; and 3) metallic post. CBCT images were acquired using an Orthopantomograph 300 unit with and without a MAR tool. Read More

J Oral Biol Craniofac Res 2021 Apr-Jun;11(2):330-333. Epub 2021 Mar 10.

NMC Medical Centre, Dubai, United Arab Emirates.

Aim: To evaluate the microleakage of newer bioceramic root-end filling materials.

Material And Method: Sixty freshly extracted human single-rooted mandibular premolar teeth were selected for the study. Teeth with fractured root, cracks, anddilacerations were rejected. Read More

J Feline Med Surg 2021 Mar 24:1098612X21998612. Epub 2021 Mar 24.

Langford Small Animal Hospital, Langford House, University of Bristol, Bristol, UK.

Case Series Summary: The aim of this case series was to describe the clinical features and treatment of paronychia in cats diagnosed with patellar fracture and dental anomaly syndrome (PADS). Clinical records, photographs, microbiology, cytology and histopathology reports were collected, and follow-up was obtained. Five cats with paronychia were included. Read More

Aust Endod J 2021 Mar 23. Epub 2021 Mar 23.

Department of Endodontics, School of Dentistry, São Leopoldo Mandic Faculty, Campinas, Brazil.

This study evaluated the ability of reciprocating glide path instruments to reach the full working length (RFWL). Thirty mesial roots of mandibular molars were matched into 2 groups (n = 15 teeth, 30 root canals), according to the system used for glide path: WaveOne Gold Glider (WOGG) and R-Pilot. The samples with fractured instruments or when it was not possible to RFWL were scanned using micro-computed tomography. Read More

J Adv Prosthodont 2021 Feb 23;13(1):36-45. Epub 2021 Feb 23.

Department of Prosthetic Dentistry, King Khalid University, Abha, Saudi Arabia.

Purpose: To investigate the fracture resistance of monolithic CAD-CAM all-ceramic surveyed crowns with two different occlusal rest seat designs.

Materials And Methods: Two maxillary first premolar were prepared for all-ceramic surveyed crowns with wide (2/3 of buccolingual width of an unprepared tooth) or narrow (1/3 of buccolingual width of an unprepared tooth) disto-occlusal rest seat (ORS) designs. Eighty monolithic CAD-CAM all-ceramic surveyed crowns were prepared and divided into 4 groups - Group CR, Composite resin material as a control; Group LDS, Lithium disilicate based material; Group ZIPS, zirconia-material (IPS ZirCAD); and Group ZLHT, zirconia- material (CeramillZolidht+). Read More

Prim Dent J 2021 Mar;10(1):20-27

Specialist in Endodontics, Senior Lecturer, University of Liverpool Dental School; ENDO61 Specialist practice, Manchester.

Examining the nature of stress distribution within the intact tooth can aid in understanding how natural tooth structures are able to resist mechanical forces during masticatory function. Identification of potential fractures in teeth on clinical examination is essential for correct diagnosis, particularly if there is pulpal involvement. This discussion will consider the different types of fracture, their identification and management. Read More

Front Immunol 2021 26;12:626593. Epub 2021 Feb 26.

Department of Pediatrics, Advanced Pediatric Centre, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

Hyper-IgE Syndrome (HIES) is a rare inborn error of immunity (IEI) characterized by a constellation of symptoms related to susceptibility to skin and pulmonary infections, eczema, raised serum IgE (>2,000 IU/ml), craniofacial anomalies, and recurrent bone fractures. Data on HIES from the Indian subcontinent is scarce and restricted to small case series and case reports. This is the first compilation of national data on HIES. Read More

J Mech Behav Biomed Mater 2021 Jun 3;118:104440. Epub 2021 Mar 3.

Department of Biomaterials Science and Turku Clinical Biomaterials Center -TCBC Institute of Dentistry, University of Turku, Turku, Finland.

Objectives: The aim was to explore the survival of extensively damaged anterior teeth without ferrule restored with different fiber-reinforced composite (FRC) post-core foundations and composite crowns.

Materials And Methods: Sixty extracted upper central incisors were decoronated and randomly divided into four groups (n = 15). After endodontic treatment, the specimens were restored with different individualized fiber-reinforced post-core foundations as follows: control group (CTRL): multiple unidirectional FRC-post + dual-cure composite-core, PFC: multiple unidirectional FRC-post + packable short fiber-reinforced composite (SFRC), BPFC: Bioblock technique with only packable SFRC, BFFC: Bioblock technique with only flowable SFRC. Read More

BMC Pediatr 2021 Mar 6;21(1):113. Epub 2021 Mar 6.

FRIGE's Institute of Human Genetics, FRIGE House, Jodhpur Gam Road, Satellite, Ahmedabad, 380015, India.

Background: Bi-allelic mutations in FAM20C gene are known to cause a rare genetic disorder- Raine syndrome (RS). The FAM20C protein binds calcium and phosphorylates proteins involved in biomineralization of bones and teeth. RS is recognized as an osteosclerotic bone dysplasia. Read More

J Craniofac Surg 2021 Mar 4. Epub 2021 Mar 4.

Department of Plastic Surgery, Inha University School of Medicine Department of Plastic Surgery, Inha University Hospital, Incheon, South Korea.

Abstract: The authors report a case of nasal bone fracture caused by a dog bite in a 25-year-old woman.A 25-year-old woman presented with lacerations of the face caused by a dog bite. When visiting her friend's house, a malamute attacked her. Read More

Int J Mol Sci 2021 Feb 27;22(5). Epub 2021 Feb 27.

Ginza Orthodontic Clinic, Ginza Granvia 6F, 3-3-14 Ginza, Chuo-ku, Tokyo 104-0061, Japan.

The aim of this paper is to provide a review on the role of inflammation in orthodontically induced inflammatory root resorption (OIIRR) and accelerating orthodontic tooth movement (AOTM) in orthodontic treatment. Orthodontic tooth movement (OTM) is stimulated by remodeling of the periodontal ligament (PDL) and alveolar bone. These remodeling activities and tooth displacement are involved in the occurrence of an inflammatory process in the periodontium, in response to orthodontic forces. Read More

Dent Mater 2021 05 27;37(5):796-804. Epub 2021 Feb 27.

Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, MN 55455, United States. Electronic address:

Objective: To develop a new method to test the fracture strength of endodontically-treated root dentin.

Method: Bovine tooth roots were transversely cut into 2-mm thick sections and the root canals were enlarged with a taper of 0.06. Read More

Proc Biol Sci 2021 Mar 3;288(1946):20203173. Epub 2021 Mar 3.

Department of Functional Morphology and Biomechanics, Zoological Institute of the Christian-Albrechts-Universität zu Kiel, Am Botanischen Garten 9, 24118 Kiel, Germany.

One molluscan autapomorphy is the radula, the organ used for feeding. Here, for the first time, the performance and failure of taenioglossan radular teeth were tested in a biomechanical experiment which in turn allowed building hypotheses about tooth functionalities. Shear load was applied to tooth cusps with a force transducer until structural failure occurred, the broken area was measured, and finally breaking stress was calculated. Read More