35,802 results match your criteria teeth three


Lower third molar inclusion associated with paraesthesia: A case report.

Exp Ther Med 2021 Aug 3;22(2):826. Epub 2021 Jun 3.

Department of Periodontology, 'Gr. T. Popa' University of Medicine and Pharmacy, 700020 Iasi, Romania.

When lower third molar inclusion is associated with neurosensorial complications, the treatment of choice is its surgical avulsion. One of these complications, that may be the most alarming during a first medical examination, is hemi-lip paraesthesia, that can appear in the presence of several mandibular lesions. This is a report of a rare clinical case in which paraesthesia was linked to the closeness between the root block of the dental element and the mandibular canal, which houses the neurovascular trunk of the lower mandibular nerve. Read More

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Three-Dimensional Culture of Ameloblast-Originated HAT-7 Cells for Functional Modeling of Defective Tooth Enamel Formation.

Front Pharmacol 2021 2;12:682654. Epub 2021 Jun 2.

Department of Oral Biology, Semmelweis University, Budapest, Hungary.

Amelogenesis, the formation of dental enamel, is well understood at the histomorphological level but the underlying molecular mechanisms are poorly characterized. Ameloblasts secrete enamel matrix proteins and Ca, and also regulate extracellular pH as the formation of hydroxyapatite crystals generates large quantities of protons. Genetic or environmental impairment of transport and regulatory processes (e. Read More

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Trigeminal sensory nerve patterns in dentine and their responses to attrition in rat molars.

Arch Oral Biol 2021 Jun 10;129:105197. Epub 2021 Jun 10.

Department of Anesthesiology and Pain Medicine, Univ. Washington, Seattle, WA, 98195-6540, USA.

Objective: Our goal was to define trigeminal nerve ending quantities and patterns in rat molar dentine, their responses to attrition (tooth wear), and their associated odontoblasts and connections with pulpal plexuses.

Design: Trigeminal ganglia were labeled for axonal transport of H-proteins to dentinal nerve endings in male rats (3-13 months old). Autoradiography detected radio-labeled dentinal tubules as indicators of nerve ending locations. Read More

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Posterior superior alveolar nerves contribute to sensation in the anterior teeth.

Ann Anat 2021 Jun 16:151784. Epub 2021 Jun 16.

Division of Anatomy and Cell Biology of the Hard Tissues, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences, 2-5274 Gakkocho-dori, Chuo-ku, Niigata 951-8514, Japan. Electronic address:

Background: There is no available data on the occurrence rate of a converged alveolar canal, the detailed three-dimensional (3D) courses of alveolar canals/grooves (ACGs), or the contribution of each superior alveolar nerve to each area in the maxilla. This study aimed to clarify the 3D courses of ACGs, the relationship between ACGs and superior alveolar nerves, and the contribution of posterior superior alveolar nerves (PSANs) using computed tomography (CT) with histological analysis.

Methods: During the gross anatomy course at Niigata University, we investigated nine human cadavers. Read More

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Root canal instrumentation efficacy of non-fused and fused primary molar roots: a micro-computed tomography study.

Eur Arch Paediatr Dent 2021 Jun 19. Epub 2021 Jun 19.

Paediatric Dentistry, Melbourne Dental School, The University of Melbourne, Melbourne, VIC, Australia.

Purpose: Pulpectomy may be indicated in restorable primary teeth exhibiting irreversible pulpitis or pulpal necrosis. The purpose of this study was to compare the cleaning and shaping efficacy of NiTi systems (Reciproc Blue and MTwo) with manual stainless-steel instrumentation in primary molars using micro-CT analysis.

Methods: Fifty-seven maxillary second primary molars were scanned using micro-CT. Read More

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[Three-dimensional movement of posterior teeth after losing the interproximal and occlusal contacts in adults].

Beijing Da Xue Xue Bao Yi Xue Ban 2021 Jun;53(3):594-597

Department of Prosthodontics, 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 observe the movement of posterior teeth after losing the interproximal and occlusal contacts in adults from the amount and speed of mesial-distal, buccal-lingual, occlusal-gingival and three-dimensional movements.

Methods: Twenty cases of metal post-core restoration from the Department of Prosthodontics, Peking University School and Hospital of Stomatology were recruited into this study, which was an observational study. The restored teeth had complete mesial, distal, and occlusal contacts before treatment. Read More

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Effects of preoperative air-powder polishing and rubber-cup prophylaxis on tooth bleaching: randomized controlled split-mouth clinical study.

Clin Oral Investig 2021 Jun 18. Epub 2021 Jun 18.

Faculty of Dentistry, Department of Periodontology, Cukurova University, Sarıcam, Adana, Turkey.

Objective: This clinical study aimed to compare the effects of preoperative air-powder polishing and rubber-cup prophylaxis on tooth bleaching.

Materials And Methods: Twenty-three patients with tooth discoloration were enrolled in this randomized controlled split-mouth experimental study. Before bleaching, air-powder polishing (APP) and rubber-cup polishing (RCP) techniques were applied on either side of the mouth. Read More

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Low-intensity pulsed ultrasound attenuates replacement root resorption of avulsed teeth stored in dry condition in dogs.

Sci Rep 2021 Jun 18;11(1):12892. Epub 2021 Jun 18.

Department of Conservative Dentistry and Oral Science Research Center, Yonsei University College of Dentistry, Seoul, 03722, Republic of Korea.

This study aimed to investigate the effects of low-intensity pulsed ultrasound (LIPUS) on replacement root resorption after replantation of avulsed teeth stored in a dry condition in dogs. A total of 73 premolar roots from four male mongrel dogs were intentionally avulsed with forceps and divided into four groups-HN, HL, DN, and DL-according to storage conditions and whether or not they received LIPUS treatment. Thirty-eight roots were kept in Hanks' Balanced Salt Solution for 30 min (HN and HL groups), whereas the remaining 35 roots were left to dry in the air for an hour (DN and DL groups) prior to replantation. Read More

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Spatio-temporal temperature fields generated coronally with bulk-fill resin composites: A thermography study.

Dent Mater 2021 Jun 15. Epub 2021 Jun 15.

Dentistry, School of Medical Sciences, University of Manchester, Manchester, UK; Photon Science Institute, University of Manchester, Manchester, UK. Electronic address:

Objective: This study aimed to investigate the effects of (i) a high-irradiance (3s) light-curing protocol versus (ii) two standard-irradiance (10s) protocols on 2D temperature maps during intra-dental photo-irradiation within a molar cavity restored with either Ultra-Rapid Photo-Polymerized Bulk Fill (URPBF) composites or a pre-heated thermo-viscous bulk-fill composite, compared to a standard bulk-fill resin-based-composite (RBC). The specific objectives included visual assessment of the temperature maps and quantitative assessment of several temperature/time plots at four different locations.

Methods: A caries-free lower first molar cavity served as a natural tooth mold. Read More

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Influence of material and loading location on stress distribution of inlays.

Am J Dent 2021 Jun;34(3):171-176

The University of North Carolina, School of Dentistry, Division of Comprehensive Oral Health, Operative Dentistry, Chapel Hill, North Carolina, USA,

Purpose: To evaluate the stress distribution of inlays fabricated with restorative materials of different elastic moduli under two functional loading conditions by using three-dimensional (3D) finite element analysis (FEA) models of a second maxillary premolar.

Methods: A 3D model of a sound maxillary left second premolar and its supporting bone was generated in a previous study and reutilized under permission of the authors for the present study. Inlay models obtained from the sound tooth were then assigned according to the type and inherent elastic modulus of the restorative material used, as follows: microhybrid composite (Filtek Z250); indirect resin composite (Paradigm); lithium disilicate reinforced glass ceramic (IPS e. Read More

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Loading stress distribution in posterior teeth restored by different core materials under fixed zirconia partial denture: A 3D-FEA study.

Am J Dent 2021 Jun;34(3):157-162

School of Dentistry, University of Naples Federico II, and Naples, Italy,

Purpose: To evaluate the effect of different substrate stiffness [sound dentin (SD), resin composite core (RC) or metal core (MC)] on the stress distribution of a zirconia posterior three-unit fixed partial denture (FPD).

Methods: The abutment teeth (first molar and first premolar) were modeled, containing 1.5 mm of axial reduction, and converging axial walls. Read More

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Bulk-fill versus layering pure ormocer posterior restorations: A randomized split-mouth clinical trial.

Am J Dent 2021 Jun;34(3):143-149

Department of Restorative Dentistry, São Paulo State University (UNESP), Institute of Science and Technology, São Jose dos Campos, SP, Brazil.

Purpose: To evaluate the clinical performance of Class II restorations made with bulk-fill or layering pure ormocer materials, as well as the time necessary to fill the preparations.

Methods: After ethics approval, a randomized controlled split-mouth clinical trial was performed. 30 subjects were selected according to the inclusion/exclusion criteria, and two restorations were randomly performed in each first or second molar that presented caries, fracture, or cosmetic needs. Read More

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Plaque reduction and tensile strength evaluations of three dental floss products.

Am J Dent 2021 Jun;34(3):123-126

Yankell Research Consultants, Inc., Moorestown, NJ, USA.

Purpose: To compare GUM ButlerWeave Mint waxed floss, Reach Mint waxed floss and Oral-B Glide Pro-Health Original waxed floss for the tensile strength parameters, load and elongation, and for their ability to reduce artificial plaque. Also examined is the potential relationship between the tensile strength physical attributes and floss efficacy.

Methods: For artificial plaque removal, floss products were placed around interproximal surfaces of artificial plaque-covered posterior-shaped teeth extending to a 60° angle. Read More

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The effect of autogenous tooth bone graft material without organic matter and type I collagen treatment on bone regeneration.

Maxillofac Plast Reconstr Surg 2021 Jun 18;43(1):17. Epub 2021 Jun 18.

Department of Oral and Maxillofacial Surgery, School of Dentistry, Pusan National University, Yangsan, 50612, Republic of Korea.

Objectives: The aim of this study is to examine the effect of particulate autogenous tooth graft removed with organic matter and type I collagen addition on bone regeneration and to validate the possibility of useful allograft material for jaw defects.

Material And Methods: Autogenous tooth bone maker (Korean Dental Solution® KOREA) made particulate autogenous tooth not including organic matter. We used to the developed tooth grafts for experiment. Read More

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Effects of different aligner materials and attachments on orthodontic behavior.

J Dent Sci 2021 Jul 12;16(3):1001-1009. Epub 2021 Feb 12.

School of Dentistry, College of Oral Medicine, Chung Shan Medical University, Department of Orthodontics, Chung Shan Medical University Hospital, Taichung, Taiwan.

Background/purpose: The orthodontic aligner becomes popular worldwide in orthodontic therapy as an esthetic alternative to fixed labial braces. This study evaluated orthodontic tooth movement behavior using different aligner materials and attachment shapes for the movement of a single tooth.

Materials And Methods: First bicuspid extracted resin typodont models were printed with a 3D printer. Read More

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The investigation of the stress distribution in abutment teeth for connected crowns.

J Dent Sci 2021 Jul 26;16(3):929-936. Epub 2020 Nov 26.

Department of Fixed Prosthodontics, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.

Background/purpose: With the advancement of an over aging society, the average number of remaining teeth has increased. However, these remaining teeth do not always have sufficient alveolar bone support, and sometimes fabricated connected crowns are applied. This study evaluated the influence of crown material, crown thickness, and alveolar bone resorption on the stress distribution within the abutment teeth of connected crowns. Read More

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Impact of Canal Taper and Access Cavity Design on the Lifespan of an Endodontically Treated Mandibualr Molar: A Finite Element Analysis.

J Endod 2021 Jun 14. Epub 2021 Jun 14.

Department of Conservative Dentistry, Pusan National University School of Dentistry, Dental Research Institute, Dental and Life Science Institute, Yangsan, Korea. Electronic address:

Introduction: This study investigated the impact of different canal tapers and access cavity designs on the lifespan of endodontically treated mandibular first molar using the finite element method.

Methods: Finite element analysis was performed on simulated models with three access cavity designs (traditional, conservative and truss). The mesial canals were prepared to either constant tapers of 25/. Read More

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From lollipops to lidocaine: The need for a universal print-to-speech framework.

Can J Exp Psychol 2021 Jun 17. Epub 2021 Jun 17.

Department of Communication Sciences and Disorders.

Objective: There is a strong relationship between reading and articulation (Lervåg & Hulme, 2009; Pan et al., 2011). Given the tight coupling of these processes, innovative approaches are needed to understand the intricacies associated with print-speech connections. Read More

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Human myelin protein P2: From crystallography to time-lapse membrane imaging and neuropathy-associated variants.

FEBS J 2021 Jun 17. Epub 2021 Jun 17.

Faculty of Biochemistry and Molecular Medicine & Biocenter Oulu, University of Oulu, Finland.

Peripheral myelin protein 2 (P2) is a fatty acid-binding protein expressed in vertebrate peripheral nervous system myelin, as well as in human astrocytes. Suggested functions of P2 include membrane stacking and lipid transport. Mutations in the PMP2 gene, encoding P2, are associated with Charcot-Marie-Tooth disease (CMT). Read More

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Ectopic third mandibular molar: evaluation of surgical practices and meta-analysis.

Clin Oral Investig 2021 Jun 17. Epub 2021 Jun 17.

Oral and Maxillofacial Department, Estaing Hospital, CHU Clermont Ferrand, 1 Place Lucie Aubrac, 63003, Clermont Ferrand Cedex 1, France.

Objectives: To identify the preferred surgical approach (intra- or extra-oral) to remove an ectopic third mandibular molar (ETMM) according on its location and presence of an associated cyst or cutaneous fistula, and to determine the indications for a graft or osteosynthesis.

Materials And Methods: A surgical practice questionnaire was distributed to oral and maxillo-facial surgeons attending a National Congress of the French Society of Stomatology, Maxillo-facial and Oral Surgery. A systematic review of the literature and meta-analysis was carried on Pubmed, Cochrane, Embase and ScienceDirect databases using the MeSH terms: "Ectopic teeth", "Third molar", "Mandibular". Read More

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Micro-computed tomographic evaluation of root canal morphology in mandibular first premolars from a Colombian population.

Acta Odontol Latinoam 2021 Apr;34(1):50-55

Universidade Iguaçu (UNIG), Faculdade de Odontologia, Departamento de Endodontia e Pesquisa Odontológica, Nova Iguaçu, Rio de Janeiro, Brasil.

Dental anatomy can vary significantly between different populations from different countries. Dental anatomical variations are of great interest to the dental professional, especially to endodontists, since they can influence the outcome of endodontic treatment. The purpose of the present study was to describe the anatomical variations of the root canal in mandibular first premolars in a population from Colombia, using micro-computed tomography. Read More

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Frequency Of Developmentally Malformed Permanent Maxillary Lateral Incisors In Patients Visiting The Three Teaching Dental Hospitals Of Peshawar.

J Ayub Med Coll Abbottabad 2021 Apr-Jun;33(2):299-302

Department, Oral and Maxillofacial Surgery, Ayub College of Dentistry, Abbottabad, Pakistan.

Background: The permanent maxillary lateral incisor (PMLI) shows morphological variations, in the form of different crown shapes such as peg-shaped, cone-shaped, barrel-shaped and canine-shaped. The frequency of developmentally malformed permanent maxillary lateral incisors varies among different populations. The aim of this study was to document the frequency of different shapes of developmentally malformed permanent maxillary lateral incisors in patients visiting the three teaching dental hospitals of Peshawar. Read More

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Effect of Root Dentin Pretreatment on Micro-Push-Out Bond Strength of Fiber Posts to Root Canal Dentin: Cold Atmospheric Argon Plasma (CAAP) and Ethylenediaminetetraacetic Acid (EDTA).

Int J Dent 2021 28;2021:5571480. Epub 2021 May 28.

Dental Research Center, Dentistry Research Institute, Tehran University of Medical Science, Tehran, Iran.

Purpose: Debonding from the root canal dentin is the most common failure mode of fiber posts. This study aimed to assess the effects of cold atmospheric argon plasma (CAAP) and ethylenediaminetetraacetic acid (EDTA) on micro-push-out bond strength of fiber posts to root canal dentin.

Materials And Methods: Forty maxillary canine teeth were decoronated, underwent endodontic treatment, and were stored in an incubator for 7 days. Read More

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Antibiotic Mixtures in Noninstrumental Endodontic Treatment of Primary Teeth with Necrotic Pulps: A Systematic Review.

Int J Dent 2021 27;2021:5518599. Epub 2021 May 27.

Pediatric and Preventive Dentistry Department, Faculty of Dental Medicine of Monastir, Monastir, Tunisia.

Objective: To compare the effectiveness of topical antibiotic mixtures used in noninstrumental endodontic treatment (NIET) of primary teeth.

Methods: Electronic databases including MEDLINE, the Cochrane Library, and Scopus database were searched. Randomized clinical trials evaluating the clinical and radiological outcomes of topical antibiotics used in NIET were selected. Read More

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Effect of Die Spacer Thickness on the Fracture Resistance of CAD/CAM Lithium Disilicate Veneers on Maxillary First Premolars.

Clin Cosmet Investig Dent 2021 8;13:223-230. Epub 2021 Jun 8.

Conservative Dentistry Department, Faculty of Dentistry, Alexandria, University, Alexandria, Egypt.

Objective: The purpose of this study was to compare the fracture resistance of ceramic veneers with digital die spacer settings at 20 µm, 40 µm, and 100 µm.

Materials And Methods: Eighteen sound maxillary first premolars were divided into three groups (n=6) according to their digital die spacer settings: group A=20 µm, group B=40 µm, group C=100 µm. Each tooth was prepared to a depth of 0. Read More

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Etiological Factors of the Midline Diastema in Children: A Systematic Review.

Int J Gen Med 2021 8;14:2397-2405. Epub 2021 Jun 8.

Department of Prosthodontics, College of Dentistry, Majmaah University, Al-Majmaah, Saudi Arabia.

Background: Midline diastema in children is a prevalent developmental entity, and this pathological condition may remain in many children due to various factors. Nonetheless, the evidence on etiological factors of the midline diastema in children is minimal.

Purpose: To evaluate the etiological factors of midline diastema causes in children below 12 years of age from the published data. Read More

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Early implant placement with or without alveolar ridge preservation in single tooth gaps renders similar esthetic, clinical and patient-reported outcome measures: one-year results of a randomized clinical trial.

Clin Oral Implants Res 2021 Jun 15. Epub 2021 Jun 15.

Department of Oral & Maxillofacial Surgery, Erasmus University Medical Center Rotterdam, the Netherlands.

Objectives: To test whether early implant placement with alveolar ridge preservation (ARP) results in different esthetic, clinical and patient-reported outcome measures (PROMs) compared to early implant placement without ARP.

Material And Methods: Seventy-five patient requiring single tooth extraction in the anterior maxilla were recruited. Following tooth extraction, the patients were randomly allocated to three groups: 1) ARP using demineralized bovine bone mineral containing 10% collagen (DBBM-C) covered by a collagen matrix (CM) (n = 25), 2) ARP using DBBM-C covered with a palatal graft (PG) (n = 25), 3) spontaneous healing (control) (n = 25). Read More

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Three-dimensional assessment of the spheno-occipital synchondrosis and clivus after tooth-borne and bone-borne rapid maxillary expansion.

Angle Orthod 2021 Jun 15. Epub 2021 Jun 15.

Objectives: To assess changes in spheno-occipital synchondrosis after rapid maxillary expansion (RME) performed with conventional tooth-borne (TB) and bone-borne (BB) appliances.

Materials And Methods: This study included 40 subjects with transverse maxillary deficiency who received TB RME or BB RME. Cone-beam computed tomography images (CBCT) were taken before treatment (T0), and after a 6-month retention period (T1). Read More

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Tooth loss is associated with an increased risk of hypertension: A nationwide population-based cohort study.

PLoS One 2021 15;16(6):e0253257. Epub 2021 Jun 15.

Department of Neurology, Seoul Hospital, Ewha Womans University College of Medicine, Seoul, Korea.

Tooth loss is closely associated with suboptimal oral care. Suboptimal oral care can facilitate local infections. These can lead to systemic inflammation and endothelial dysfunction, which are important pathological mechanisms of hypertension. Read More

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The effect of different chelators on the dislodgement resistance of MTA Repair HP, MTA Angelus, and MTA Flow.

Odontology 2021 Jun 15. Epub 2021 Jun 15.

Department of Endodontics, Faculty of Dentistry, Antalya Bilim University, Antalya, Turkey.

The aim of this study was to investigate the influence of various irrigants on the dislodgement resistance of MTA Repair HP, MTA Angelus, and MTA Flow to root dentin. Three slices (1.0 ± 0. Read More

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