19,170 results match your criteria mandibular molars


Bite Force, Thickness, and Thermographic Patterns of Masticatory Muscles Post-Hemorrhagic Stroke.

J Stroke Cerebrovasc Dis 2021 Oct 23;31(1):106173. Epub 2021 Oct 23.

Department of Basic and Oral Biology, National Institute and Technology - Translational Medicine (INCT.TM), School of Dentistry of Ribeirão Preto, University of São Paulo, Avenida do Café, s/n, Bairro, São Paulo, SP 14040-904, Brazil. Electronic address:

Objective: Stroke is a neurological deficit of cerebrovascular origin, considered a 21st-century epidemic that causes functional changes in the human body. This study aimed to evaluate the stomatognathic system of patients after hemorrhagic stroke through the bite force, thickness, and skin temperature in the region of the masseter and temporalis muscles.

Material And Methods: Twenty-four subjects were divided into groups: post-hemorrhagic stroke; with right side of the affected body (n = 12) and without the neurological disorder (n = 12). Read More

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October 2021

Apically extruded debris in curved root canals using a new reciprocating single-file shaping system.

J Endod 2021 Oct 23. Epub 2021 Oct 23.

Department of Bioengineering and Biomaterials, INSERM 1121, Strasbourg University, 67000 Strasbourg, France; Department of Endodontics, Faculty of Dental Medicine, Strasbourg University, 67000 Strasbourg, France; Hôpitaux Universitaires de Strasbourg (HUS), Pôle de Médecine et Chirurgie Bucco-dentaires, 67000 Strasbourg, France.

Introduction: The present study addresses the influence of five different shaping file systems on apical debris extrusion (AED), using two different irrigation protocols.

Methods: One hundred and fifty mandibular first permanent molars were divided into two groups and 10 subgroups. Mesial root canals were shaped using One Reci, Wave One Gold Primary and Protaper Next using reciprocating motions, and One Curve and Protaper Next using continuous rotation. Read More

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October 2021

Finite Element Analysis of Stress Distribution in Mandibles with Different Bone Types Loaded by Implant-Supported Overdentures with Different Localizations of Locator Attachments.

Int J Oral Maxillofac Implants 2021 Sep-Oct;36(5):851-862

Purpose: Prosthetic rehabilitation of completely edentulous patients has been traditionally performed with complete dentures for many years. However, patient complaints are reported due to insufficient retention and high mobility of mandibular dentures. Therefore, in these patients, overdenture prostheses, which are usually made by placing at least two implants in the interforaminal region of the mandible, have become widespread. Read More

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October 2021

Resolution of lower second molar impaction through miniscrew-supported biomechanics: A proposal for a simplified classification.

Int Orthod 2021 Oct 22. Epub 2021 Oct 22.

Postgraduated School of Orthodontics, University of Ferrara, Ferrara, Italy.

Two case reports are presented showing how the strategic use of skeletal anchorage via orthodontic miniscrews manages to solve the complex problems of orthodontic disimpaction of second mandibular molars with excellent anchorage control and reduction of the adverse effects common to the use of conventional methods. The temporary anchorage device (TAD)-mediated biomechanics used can be categorized as both "pulling from the distal side" and "pushing from the mesial side" techniques in which both direct and indirect anchorage mechanics were employed. Each of these mechanics has its advantages and disadvantages, which must be weighed and considered on a case-by-case basis. Read More

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October 2021

[Anatomical limits of distal displacement of bony maxillary molars in patients with skeletal Class Ⅱ malocclusion].

Shanghai Kou Qiang Yi Xue 2021 Aug;30(4):410-413

Shanxi Medical University School and Hospital of Stomatology. Taiyuan 030001, China. E-mail:

Purpose: To compare the posterior space of the maxillary molar with osseous dislocation and investigate the retromolar space available for molar distalization in patients with maxillary prognathism.

Methods: Cone-beam CT (CBCT) data of 136 posterior maxillary segments in 32 patients with skeletal Class I malocclusion and 36 patients with skeletal Class Ⅱ malocclusion were analyzed. The functional tip of the maxillary first and second molars was connected as the measuring reference line, the reference plane for measurement parallel to the reference line, which passed the furcation of the mandibular second molar root, was set as the "0 mm" plane. Read More

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[Full-zirconia single-tooth molar implant-supported restorations with angulated screw channel abutments: evaluation of short-term outcomes].

Shanghai Kou Qiang Yi Xue 2021 Aug;30(4):384-388

Department of Stomatology, Anhui Ma'anshan 17th Metallurgical Hospital. Ma'anshan 243000, Anhui Province, China. E-mail:

Purpose: To evaluate the effect of full-zirconia single-tooth molar implant-supported restorations with angulated screw channel abutments.

Methods: Seventy-six patients with a single missing tooth in the posterior region of the maxilla and mandible underwent dental implants from March 2016 to March 2018 were enrolled. After 3 months, each patient received a full-contour screw-retained zirconia restoration with angulated screw channel abutment. Read More

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A Literature Review of the Rare Coexistence of Central Giant Cell Granuloma with Aneurysmal Bone Cyst: A Case Report.

Iran J Otorhinolaryngol 2021 Sep;33(118):319-325

Oral and Maxillofacial Diseases Research Center, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.

Introduction: Central giant cell granuloma (CGCG) is a benign bone tumor that occurs more in young females and anterior of the mandible. It can be unilocular or multilocular with wispy-septation, undulating borders, cortical expansion, and perforation. Central giant cell granuloma in association with other benign lesions of the jaws is named hybrid lesion. Read More

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September 2021

Impact of several NiTi-thermally treated instrumentation systems on biomechanical preparation of curved root canals in extracted mandibular molars.

Int Endod J 2021 Oct 22. Epub 2021 Oct 22.

Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo, Brazil.

Aim: To evaluate the shaping ability of several heat-treated nickel-titanium systems used to prepare root canals with moderate and severe curvature, in extracted mandibular molars, by micro-computed tomography, considering their variation in kinematics and design.

Methodology: Curved-mesial roots of mandibular molars were randomly selected and assigned into 4 balanced experimental groups (n = 10), established by determining homogeneous 3D parameters of volume and surface area: R-Motion size 30, .04 taper (RM; FKG Dentaire, Switzerland), Reciproc Blue size 25, . Read More

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October 2021

Causes of subcutaneous emphysema following dental procedures: a systematic review of cases 1993-2020.

Br Dent J 2021 10 22;231(8):493-500. Epub 2021 Oct 22.

Department of Oral Surgery, University of Leeds, UK.

Objectives Causes of subcutaneous emphysema (SE) following dental treatment have changed with new operative techniques and equipment. This review demonstrates the frequency and aetiology of SE to inform prevention strategies for reducing SE occurrences.Methods A systematic search of Medline, Embase and PubMed databases identified 135 cases of SE which met inclusion criteria after independent review by two authors. Read More

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October 2021

To prophylactically extract or not to extract partially erupted mesio-angularly impacted lower third molars?

Authors:
Sven Butzin

Br Dent J 2021 10 22;231(8):445-448. Epub 2021 Oct 22.

School of Dentistry, University of Central Lancashire, Preston, UK.

Introduction Prophylactic removal of mesio-angularly impacted mandibular third molars (MAIM3Ms) has been discouraged by the National Institute for Health and Care Excellence in 2000. Consequently, partially erupted MAIM3Ms are retained for longer and only extracted if complications arise. The debate whether to extract prophylactically or to monitor these teeth is ongoing. Read More

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October 2021

A Six-Year Prospective Comparative Study of Wide and Standard Diameter Implants in the Maxillary and Mandibular Posterior Area.

Medicina (Kaunas) 2021 Sep 25;57(10). Epub 2021 Sep 25.

Department of Oral and Maxillofacial Surgery, Korea University Graduate School of Clinical Dentistry, Seoul 08308, Korea.

: The aim of our study was to test whether wide diameter (6 mm) implants perform differently from standard diameter (4 mm) implants in terms of marginal bone level and survival rate. : Our sample comprised 72 patients who underwent surgery; a total of 80 implants were placed in the maxillary or mandibular molar region. Patients were divided into two groups according to the diameter of the implant, and were followed up for six years after the final setting of the prosthetics. Read More

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September 2021

Comparison of Preoperative Cone-Beam Computed Tomography and 3D-Double Echo Steady-State MRI in Third Molar Surgery.

J Clin Med 2021 Oct 18;10(20). Epub 2021 Oct 18.

Clinic of Cranio-Maxillofacial and Oral Surgery, Center of Dental Medicine, University of Zurich, 8032 Zurich, Switzerland.

We investigated the reliability of assessing a positional relationship between the inferior alveolar nerve (IAN) and mandibular third molar (MTM) based on CBCT, 3D-DESS MRI, and CBCT/MRI image fusion. Furthermore, we evaluated qualitative parameters such as inflammatory processes and imaging fusion patterns. Therefore, two raters prospectively assessed in 19 patients with high-risk MTM surgery cases several parameters for technical image quality and diagnostic ability using modified Likert rating scales. Read More

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October 2021

Effect of Intraoral Drainage after Impacted Mandibular Third Molar Extraction on Non-Infectious Postoperative Complications.

J Clin Med 2021 Oct 14;10(20). Epub 2021 Oct 14.

Department of Oral Surgery, Pomeranian Medical University in Szczecin, 72 Powstańców Wlkp. St., 70-111 Szczecin, Poland.

Surgical removal of mandibular third molars is associated with non-infectious postoperative complications, including pain, swelling, trismus. Intraoral drains are noteworthy because of their ease of application, availability, and effectiveness. This study aimed to evaluate the use of latex and calcium-sodium alginate mouth flat drains on the severity of postoperative complications such as pain, trismus, and edema after surgical removal of mandibular third molars. Read More

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October 2021

Photobiomodulation therapy for hypersensitivity associated with molar-incisor hypomineralization: a case report.

Gen Dent 2021 Nov-Dec;69(6):50-53

Molar-incisor hypomineralization (MIH) is a qualitative defect of the dental enamel on permanent first molars and may be associated with permanent incisors. There is currently no defined therapeutic protocol for managing the hypersensitivity associated with this condition. The present case report describes the treatment of a patient with MIH and the impact on the patient's quality of life as assessed using the Child Perceptions Questionnaire for children aged 11 to 14 years (CPQ). Read More

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October 2021

Biomechanical analysis of subcondylar fracture fixation using miniplates at different positions and of different lengths.

BMC Oral Health 2021 Oct 21;21(1):543. Epub 2021 Oct 21.

Department of Medical Research, Taichung Veterans General Hospital, Taichung, 407, Taiwan.

Background: Many types of titanium plates were used to treat subcondylar fracture clinically. However, the efficacy of fixation in different implant positions and lengths of the bone plate has not been thoroughly investigated. Therefore, the primary purpose of this study was to use finite element analysis (FEA) to analyze the biomechanical effects of subcondylar fracture fixation with miniplates at different positions and lengths so that clinicians were able to find a better strategy of fixation to improve the efficacy and outcome of treatment. Read More

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October 2021

Osteogenesis imperfecta type III: Oral, craniofacial characteristics and atypical radiographic findings oral.

J Clin Exp Dent 2021 Oct 1;13(10):e1053-e1056. Epub 2021 Oct 1.

DDS, Ms, Department of Special Care Dentistry, Dental School, University of Western Sao Paulo, Presidente Prudente, Sao Paulo, Brazil.

Osteogenesis imperfecta (OI) is a disease characterized by decreased bone mineral density, causing susceptibility to bone fractures by mild trauma and bone deformities. The aim of this study was to describe an osteogenesis imperfecta type III clinical case, its craniofacial and oral changes as well as its atypical radiographic findings. An eighteen-year-old, male patient diagnosed with osteogenesis imperfecta type III was referred for dental evaluation; the clinical examination showed the craniofacial and oral changes of the disease such as triangular face, class III malocclusion, anterior open bite and posterior crossbite, dentinogenesis imperfecta presenting amber discoloration. Read More

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October 2021

Human amniotic membrane as therapeutic agent in pulpotomy of permanent molars.

BMJ Case Rep 2021 Oct 19;14(10). Epub 2021 Oct 19.

Conservative Dentistry and Endodontics, King George's Medical University, Lucknow, Uttar Pradesh, India.

A 22-year-old woman reported with a cariously exposed mandibular molar. Pulpotomy was planned rather than routine root canal treatment, which was otherwise indicated. Amniotic membrane (AM) that has been extensively researched in different fields of medicine was used as the pulpotomy agent. Read More

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October 2021

Crown heights in the permanent teeth of 47,XXY males and 47,XXX females.

Acta Odontol Scand 2021 Oct 19:1-8. Epub 2021 Oct 19.

Research Unit of Oral Health Sciences, Oral Development and Orthodontics, Faculty of Medicine, University of Oulu, Oulu, Finland.

Objective: Earlier results based on dental casts and radiographs have shown that additional X and Y chromosomes influence permanent and deciduous tooth crown sizes, with 47,XYY males exhibiting greater crown heights than 46,XY males. We studied here the effect of both X and Y chromosomes on tooth crown heights.

Material And Methods: The series consisted of 48 47,XXY males, 22 of their male relatives, and seven 47,XXX females with five female relatives. Read More

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October 2021

Application of Fractal Analysis in Detecting Trabecular Bone Changes in Periapical Radiograph of Patients with Periodontitis.

Int J Dent 2021 7;2021:3221448. Epub 2021 Oct 7.

Department of Neurosciences, Reproductive and Odontostomatological Sciences, University of Naples "Federico II", Naples, Italy.

Introduction: Evaluation of detailed features of the supporting bone is an important step in diagnosis and treatment planning for teeth with clinical attachment loss. Fractal analysis can be used as a method for evaluating the complexity of trabecular bone structures. The aim of this study was to evaluate the trabecular bone changes in periapical radiographs of patients with different stages of periodontitis using fractal analysis. Read More

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October 2021

Expression of circulating cell-free nucleic acids around miniscrew implant during orthodontic tooth movement-a prospective study.

Prog Orthod 2021 Oct 18;22(1):33. Epub 2021 Oct 18.

Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, 110029, India.

Objectives: Literature shows that the expression of various biomarkers in peri-miniscrew crevicular fluid (PMICF) is related to the stability of miniscrew implants (MSIs). The present study investigated the role and alterations in levels of circulating cell-free nucleic acids (cfNAs) in PMICF before and after orthodontic loading.

Material And Methods: This prospective study consisted of forty-six MSIs placed between the second premolar and first molar in the maxillary and mandibular arches. Read More

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October 2021

Interradicular distance and alveolar bone thickness for miniscrew insertion: a CBCT study of Persian adults with different sagittal skeletal patterns.

BMC Oral Health 2021 Oct 17;21(1):534. Epub 2021 Oct 17.

Department of Maxillofacial Radiology, School of Dentistry, Kermanshah University of Medical Sciences, Shariati Street, Kermanshah, 67139546581, Iran.

Background: This study aimed to assess the interradicular distance and alveolar bone thickness of Persian adults with different sagittal skeletal patterns for miniscrew insertion using cone-beam computed tomography (CBCT).

Methods: This cross-sectional study was conducted on maxillary and mandibular CBCT scans of 60 patients (18-35 years) in three groups (n = 20) of class I, II and III sagittal skeletal pattern. Anatomical and skeletal parameters were measured at 2, 4 and 6 mm apical to the cementoenamel junction (CEJ) by one examiner. Read More

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October 2021

Comparison of two pediatric rotary file systems and hand instrumentation in primary molar: An ex vivo cone-beam computed tomographic study.

Niger J Clin Pract 2021 Oct;24(10):1492-1498

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

Background: Pulpal involvement, secondary to dental caries, is not uncommon and is a challenging task for pediatric dentists. Morphological differences in root canal of deciduous teeth increases the complexity of management. The aim of this study was to compare two rotary file systems and hand instrumentation for root canal preparation in regard to canal transportation, centering ability ratio, and dentin thickness using cone-beam computed tomography (CBCT). Read More

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October 2021

Spontaneous space closure following the extraction of the first permanent mandibular molar.

Niger J Clin Pract 2021 Oct;24(10):1450-1456

Department of General Dentistry, Henry M. Goldman School of Dental Medicine, Boston University, Boston MA, USA.

Aim: The aim of this study was to determine the prognostic factors, such as the developmental stage of second permanent molar (SPM), the angulation of SPM, and presence/absence of the third molar associated with the spontaneous space closure after the mandibular first permanent molars (FPM) extraction.

Material And Methods: A total of 177 mandibular SPMs were evaluated in this cross-sectional study. The prognostic factors determining successful space closure such as SPM developmental stage, SPM angulation, and presence/absence of the third molar were evaluated. Read More

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October 2021

The effect of dental anxiety on surgical time of mandibular third molar disimpaction.

Niger J Clin Pract 2021 Oct;24(10):1430-1437

Department of Oral and Maxillofacial Surgery, Bayero University/Aminu Kano Teaching Hospital, Kano, Nigeria.

Background: Dental treatment of anxious patients induces stress due to the patients' expectation of pain. This may prolong treatment due to such patients' inability to cooperate during treatment.

Aim: The aim of the study was to determine the effect of dental anxiety on surgical time of mandibular third molar (M3) disimpactions at a Nigerian hospital. Read More

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October 2021

Remaining dentinal thickness after simulated post space preparation and the fit of prefabricated posts to root canal preparation shapes.

J Am Dent Assoc 2021 Oct 13. Epub 2021 Oct 13.

Background: Post space preparation can increase the risk of experiencing perforation and root fracture. The authors assessed remaining dentin thickness after post space preparation and the fit of different prefabricated posts to root canal preparation systems in a theoretical model.

Methods: Ten datasets per type of tooth from cone-beam computed tomography were analyzed to determine the minimum root diameter from 5 through 13 mm from the apical foramen. Read More

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October 2021

Articaine Infiltration Versus Lidocaine Inferior Alveolar Nerve Block for Anesthetizing Primary Mandibular Molars: A Randomized, Controlled, Double-Blind Pilot Study.

Pediatr Dent 2021 Sep;43(5):344-348

Dr. Han is an assistant professor and graduate program director, Department of Oral and Maxillofacial Surgery, College of Dentistry, University of Illinois at Chicago, Chicago, Ill., USA.

The purpose of this study was to compare the effectiveness of articaine local infiltration to lidocaine inferior alveolar nerve block (IANB) for restorative treatment of primary mandibular molars (PMM). Four- to 10-year-old children who needed PMM restorations were enrolled according to inclusion criteria and randomly allocated into the articaine or lidocaine group. One operator administered all local anesthesia. Read More

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September 2021

Influence of bone anatomical morphology of mandibular molars on dental implant based on CBCT.

BMC Oral Health 2021 Oct 15;21(1):528. Epub 2021 Oct 15.

Department of Stomatology, The First Affiliated Hospital of Wenzhou Medical University, Nanbaixiang Ouhai District, Wenzhou, 325000, Zhejiang, People's Republic of China.

Background: To apply CBCT to investigate the anatomical relationship between the mandibular molar and alveolar bone, aimed to provide clinical guidelines for the design of implant restoration.

Methods: 201 CBCT data were reevaluated to measure height of the alveolar process (EF), width of the alveolar process (GH), width of the basal bone (IJ), the angle between the long axis of the first molar and the alveolar bone (∠a) and the angle between the long axis of the alveolar bone and basal bone (∠b). The angle and width were measured to determine the implant-prosthodontic classification of the morphology in the left lower first molar (36) and right lower first molar (46). Read More

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October 2021

Evaluation of the effect of impaction on the mineralization of mandibular third molars and forensic age estimation in a sample of south Indian children.

Int J Legal Med 2021 Oct 15. Epub 2021 Oct 15.

Panineeya Mahavidyalaya Institute of Dental Sciences, Hyderabad, India.

Assessment of third molar mineralization is a basic forensic odontological method available for age estimation in children and adolescents. Due to their protracted development into the late adolescence, their development has become the subject of interest and acquired great forensic importance. It is clearly evident in the literature that impaction factor has an influence on the rate of maturation of the third molars. Read More

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October 2021

Comparison of Apical Extrusion of Bacteria After Glide Path Preparation Between Manual K File, One G Rotary, and WaveOne Gold Glider Reciprocation Preparations.

Eur Endod J 2021 Aug;6(2):221-225

School of Dentistry (V.N.), International Medical University, Kuala Lumpur, Malaysia; College of Dental Medicine, University of Sharjah, UAE.

Objective: To compare the amount of apically extruded bacteria between hand-filed preparations, rotary and reciprocation glide path preparations in curved canals of extracted teeth infected with Enterococcus faecalis.

Methods: Forty mandibular first molar teeth were decoronated, fitted into rubber stoppers and fixed onto glass vials. The mesiobuccal canals from mandibular first molar teeth were infected with Enterococcus faecalis, then randomly assigned to one of five groups for glide path preparation: manual stainless-steel file (K-files), rotary file (One G), reciprocating file (WaveOne Gold Glider) and two control groups. Read More

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Visualization of mandibular movement relative to the maxilla during mastication in mice: integration of kinematic analysis and reconstruction of a three-dimensional model of the maxillofacial structure.

BMC Oral Health 2021 Oct 14;21(1):527. Epub 2021 Oct 14.

Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki, 852-8588, Japan.

Background: Mastication is one of the most fundamental functions for the conservation of human life. To clarify the pathogenetic mechanism of various oral dysfunctions, the demand for devices for evaluating stomatognathic function has been increasing. The aim of the present study was to develop a system to reconstruct and visualize 3-dimensional (3D) mandibular movements relative to the maxilla, including dynamic transition of occlusal contacts between the upper and lower dentitions during mastication in mice. Read More

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October 2021