16,201 results match your criteria groups mandibular


The effect of root canal preparation size and taper of middle mesial canals on fracture resistance of the mandibular molar teeth: An in vitro study.

J Endod 2021 Jun 9. Epub 2021 Jun 9.

(Associate Professor) Department of Endodontology, Faculty of Dentistry, Ege University, Izmir, Turkey. Electronic address:

Introduction: The aim of the present study was to investigate the influence of root canal preparation size and taper of middle mesial (MM) canals on fracture resistance of mandibular molars.

Methods: Fifty-five mandibular molar teeth having MM canal were selected based on the cone-beam computed tomography analysis. Following the decoronation and distal root separation procedure, the lengths of the mesial roots were standardized to 13 mm. Read More

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Predictors of Respiratory Dysfunction at Diagnosis of Robin Sequence.

Laryngoscope 2021 Jun 12. Epub 2021 Jun 12.

Department of Plastic and Craniofacial Surgery, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil.

Objectives/hypothesis: Robin sequence (RS) consists of associated micrognathia, glossoptosis, and respiratory dysfunction, with or without cleft palate. Studies on how different patient characteristics impact the severity of respiratory dysfunction are scarce and contradictory; this study investigates how different features affect respiratory obstruction severity at diagnosis of RS in controlled analysis.

Study Design: Retrospective cohort study that enrolled 71 RS patients under 90 days old who received care in our institution from 2009 to 2020. Read More

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Effectiveness of Nanohydroxyapatite on Demineralization of Enamel and Cementum Surrounding Margin of Yttria-Stabilized Zirconia Polycrystalline Ceramic Restoration.

ScientificWorldJournal 2021 19;2021:5540738. Epub 2021 May 19.

Division of Biomaterials and Prosthodontics Research, Faculty of Dentistry, Khon Kaen University, Khon Kaen 40002, Thailand.

Introduction: Prosthetic dentistry has shifted toward prevention of caries occurrence surrounding restorative margin through the anti-demineralization process. This study examines the ability of nanohydroxyapatite (NHA) gel and Clinpro (CP) on enhancing resistance to demineralization of enamel and cementum at margin of restoration.

Materials And Methods: Thirty extracted mandibular third molars were segregated at 1 mm above and below cementoenamel junction (CEJ) to separate CEJ portions and substituted with zirconia disks by bonding to crown and root portions with resin adhesive. Read More

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[Comparison of apical root resorption of maxillary incisors between adolescents and adults after orthodontic treatment].

Shanghai Kou Qiang Yi Xue 2021 Apr;30(2):187-190

Department of Stomatology, Inner Mongolia Chifeng College Affiliated Hospital. Chifeng 024000, Inner Mongolia Autonomous Region, China.

Purpose: To compare apical root resorption of maxillary incisors between adolescents and adults after orthodontic treatment.

Methods: Patients receiving orthodontic treatment in Affiliated Hospital of Chifeng University from May 2014 to August 2016 were enrolled, and divided into two age groups: adolescent group (32) and adult group (36). The included subjects received orthodontic fixed appliance treatment with straight-wire technique combined with Hawley type retainer for one year. Read More

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Panoramic prediction equations to estimate implant- to-mandibular canal dimensions in the mandibular posterior region: implications for dental implant treatment.

Head Face Med 2021 Jun 9;17(1):19. Epub 2021 Jun 9.

University Clinic of Oral and Maxillofacial Surgery, Medical University of Innsbruck, Anichstraße 35, A-6020, Innsbruck, Austria.

Background: To develop and cross-validate site-specific panoramic radiography (PAN) analysis prediction equations of implant-to-mandibular canal dimensions (IMCD) in mandibular regions posterior to the mental foramen, and to help determine in which instances CBCT technology will be a justified adjunct in clinical practice.

Methods: IMCD by PAN (Pan-D) from implant site-specific regions (first premolar, second premolar, first molar, and second molar sites) were collected from 40- to 70-year-old adolescents. They were randomly assigned to validation (n = 144) and cross-validation (n = 148) groups. Read More

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Effect of hydroxyethyl cellulose soluble hemostatic gauze on hemostasis in facial contouring surgery.

Medicine (Baltimore) 2021 May;100(19):e25847

16th Department, Plastic Surgery Hospital, Chinese Academy of Medical Sciences, Peking Union Medical College, Shijingshan District, Beijing, China.

Background: In facial contour surgery, due to the narrow field of vision in the oral approach and the abundant blood supply to the maxillofacial area, hemostasis is not easy. The purpose of this study was to evaluate the hemostatic effect of soluble hemostatic gauze.

Methods: We organized a prospective randomized study of 282 patients receiving facial contouring surgery (4 types of procedures in total) during 2016. Read More

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Effects of photobiomodulation associated with orofacial myofactional therapy on temporomandibular joint dysfunction.

Codas 2021 4;33(6):e20200193. Epub 2021 Jun 4.

Programa de Pós-graduação em Saúde da Comunicação Humana, Universidade Federal de Pernambuco - UFPE - Recife (PE), Brasil.

Purpose: To investigate the influence of photobiomodulation associated with orofacial myofunctional therapy (OMT) in patients with temporomandibular muscle disorders (TMD).

Methods: Randomized, blinded trial clinical study with a sample of eleven women with muscle TMD divided into two groups. The experimental group (EG) consisted of five women submitted to orofacial myofunctional therapy associated with photobiomodulation, and the control group (CG) consisted of six women submitted to orofacial myofunctional therapy associated with inactive photobiomodulation (placebo). Read More

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Accuracy of Microcomputed Tomography in Detecting Dentinal Cracks: A Correlative Study with Scanning Electron and Operative Microscopy.

Scanning 2021 15;2021:5571123. Epub 2021 May 15.

Faculty of Dentistry, Iguaçu University, Nova Iguaçu, RJ, Brazil.

The aim of the study was to evaluate the accuracy of microcomputed tomography (mCT) to detect dentinal cracks when compared with scanning electron microscopy (SEM) and operating microscopy (OM). Different conditions of pixel size (10 or 17 m), sample moisture (dry/moist), and transillumination (with/without) were evaluated. Additionally, the influence of the dentinal defect width on its detection was analyzed. Read More

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Influence of occlusal and proximal caries on outcome of full pulpotomy in posterior permanent teeth with partial irreversible pulpitis: A prospective study.

Int Endod J 2021 Jun 8. Epub 2021 Jun 8.

Division of Conservative Dentistry and Endodontics, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India.

Aim: To assess the influence of occlusal and proximal deep carious lesion on the outcome of full pulpotomy performed in mandibular teeth with pulpal diagnosis of symptomatic partial irreversible pulpitis.

Methodology: Eighty deep carious mandibular molar teeth with clinical and radiographic diagnosis of symptomatic partial irreversible pulpitis without periapical rarefaction from patients of either gender between the age of 16-35 years were included. Depending upon the location of deep carious lesion, the teeth were distributed equally into occlusal (n=40) and proximal caries groups (n=40). Read More

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Improving mandibular reconstruction by using topology optimization, patient specific design and additive manufacturing?-A biomechanical comparison against miniplates on human specimen.

PLoS One 2021 8;16(6):e0253002. Epub 2021 Jun 8.

Department of Orthopedics and Sports Orthopedics, Klinikum rechts der Isar, School of Medicine, Technical University of Munich, Munich, Germany.

In this study, topology optimized, patient specific osteosynthesis plates (TOPOS-implants) are evaluated for the mandibular reconstruction using fibula segments. These shape optimized implants are compared to a standard treatment with miniplates (thickness: 1.0 mm, titanium grade 4) in biomechanical testing using human cadaveric specimen. Read More

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Two methods of evaluating mandibular trabecular pattern in intraoral radiographs and the association to fragility fractures during a 47-year follow up.

Eur J Oral Sci 2021 Jun 8:e12801. Epub 2021 Jun 8.

Division of Family Medicine and Primary Care, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Huddinge, Sweden.

In this longitudinal cohort study, we explored the association of fragility fractures to sparse trabecular bone pattern in intraoral radiographs using two methods, a visual and a semi-automated. Our aim was to study both sexes and to include younger age-groups, during a follow-up time of 47 years. The cohort consisted of 837 men and women aged 18-65 years, with intraoral radiographs from 1970-1971. Read More

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Fracture heat map of the facial skull demonstrates a danger zone of concomitant cervical spine injuries.

Sci Rep 2021 Jun 7;11(1):11989. Epub 2021 Jun 7.

Department of Oral- and Maxillofacial Surgery, Facial Plastic Surgery, Dortmund General Hospital, Muensterstrasse 240, 44145, Dortmund, Germany.

Concomitant maxillofacial and cervical spine injuries occur in 0.8-12% of the cases. We examined the relation of injury localization and the probability of cervical spine fracture. Read More

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[Influence of preemptive analgesia with etoricoxib on three types of pain after extraction of impacted teeth].

Authors:
L Xie Z Li

Zhonghua Kou Qiang Yi Xue Za Zhi 2021 Jun;56(6):565-569

The State Key Laboratory Breeding Base of Basic Science of Stomatology & Key Laboratory of Oral Biomedicine Ministry of Education, School of Stomatology, Wuhan University, Wuhan 430079, China.

To evaluate the effect of preventive use of etocoxib-induced preemptive analgesia on three types of pain (wound pain, swallowing pain, mouth opening pain) after extraction of impacted teeth. In this study, 60 patients (60 teeth) with impacted mandibular third molars in Department of Jinyintan Outpatient, School of Stomatology, Wuhan University from May to October 2020 were enrolled. The patients were numbered by SPSS 21. Read More

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Cleaning efficacy and uncontrolled removal of dentin of two methods of irrigant activation in curved canals connected by an isthmus.

Aust Endod J 2021 Jun 7. Epub 2021 Jun 7.

Department of Restorative Dentistry, Endodontics and Dental Materials, Bauru School of Dentistry, University of São Paulo, Bauru, Brazil.

The aim of this study was to compare the efficacy of UAI with ESI, sonic activation with Eddy and syringe irrigation in removing debris, and dentin removal during canal irrigation. Twenty-four mandibular molars containing isthmus type V and with a mean curvature of 32.5º were instrumented and divided into three groups for final irrigation: UAI with ESI, sonic activation with Eddy and syringe irrigation. Read More

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Shaping efficiency of XP-endo shaper and Mtwo instruments in long oval root canals: A micro-CT study.

Aust Endod J 2021 Jun 7. Epub 2021 Jun 7.

Department of Restorative Dentistry, Faculty of Dentistry, University of São Paulo (USP), Sao Paulo, Brazil.

This study evaluated the shaping ability of XP-endo Shaper and Mtwo systems in long-oval-shaped canals of extracted human mandibular molars using micro-computed tomography (micro-CT). Images recorded before and after preparation were evaluated for morphometric measures regarding increase in canal volume, dentin removed, surface area, untouched walls and structure model index (SMI). Data were statistically analysed using the Mann-Whitney test with 5% of significance. Read More

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Evaluation of horizontal condylar angle in malocclusions with mandibular lateral displacement using cone-beam computed tomography.

Angle Orthod 2021 Jun 7. Epub 2021 Jun 7.

Objectives: To evaluate the horizontal condylar angle (HCA) in mandibular lateral displacement (MLD).

Materials And Method: s: HCA in MLD malocclusions were examined using cone-beam computed tomography data in subjects with MLD and control subjects.

Results: HCA in joints of control patients and contralateral side joints of MLD patients were not significantly different. Read More

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Comparison of dexamethasone administration through sublingual and intramuscular routes for evaluation of pain, swelling, and trismus after impacted mandibular third molar surgery-a prospective randomized controlled study.

Oral Maxillofac Surg 2021 Jun 5. Epub 2021 Jun 5.

Rajan Dental Hospital, Chennai, India.

Purpose: To compare the efficacy of dexamethasone when administered preoperatively through sublingual and intramuscular routes for evaluating the reduction in pain, swelling, and trismus after removal of impacted mandibular third molar.

Methods: The study was conducted on patients who required surgical removal of impacted mandibular third molars under local anesthesia. A total of 150 patients were considered for the study who were divided into two groups of 75 patients each. Read More

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Evaluation of the detectability of early mandible fracture healing findings in terms of vitality aspect by using micro-CT technology in postmortem interval.

Leg Med (Tokyo) 2021 Jun 1;52:101914. Epub 2021 Jun 1.

Ankara University, Faculty of Dentistry, Department of DentoMaxillofacial Radiology, Ankara, Turkey.

The purpose of the present study was to investigate the vitality aspect of mandibular fractures using micro-CT in the analysis of bone mineral density and other bone microstructure trabecular parameters in the postmortem interval. This study included 72 female Wistar rats. In the study groups, the rats' mandibles were first fractured and after three days of living, the rats were sacrificed. Read More

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Gender- and age-related differences in the width of attached gingiva and clinical crown length in anterior teeth.

BMC Oral Health 2021 Jun 4;21(1):287. Epub 2021 Jun 4.

Department of Oral and Maxillofacial Surgery, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt Universität Zu Berlin, Augustenburger Platz 1, 13353, Berlin, Germany.

Background: The anatomical features of the gingiva and the clinical crowns and their interrelation, especially in aesthetically and functionally demanding areas, are important in complex dental or implant-retained prosthetic rehabilitations. This observational cross-sectional study was designed to evaluate gender- and age-related differences in the width of attached gingiva (WAG), the clinical crown length (CCL), and their interrelation in the anterior teeth to determine the relationship between the pink and white aesthetics.

Methods: Eighty (54 females, 26 males) fully dentate Caucasian participants between the ages of 20 and 25 years and 36 probands (23 females, 13 males) between the ages of 45 and 55 years were included in the present study. Read More

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Evaluation of marginal gap of teeth restored with crowns using six different CAD/CAM materials milled with two different milling units.

Int J Comput Dent 2021 Jun;24(2):195-205

Aim: The aim of the present study was to compare the marginal gap of teeth restored with crowns using six different CAD/CAM materials with two different milling units.

Materials And Methods: Ten mandibular molar teeth were collected after surgical extractions and prepared with two different diamond-coated instruments to receive full veneer crowns. The teeth were optically scanned, designed in CAD/CAM software, and milled in two different milling units. Read More

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Comparative evaluation of qualitative and quantitative remineralization potential of four different remineralizing agents in enamel using energy-dispersive X-ray: An study.

J Conserv Dent 2020 Nov-Dec;23(6):604-608. Epub 2021 Feb 11.

Department of Conservative Dentistry and Endodontics. Ultra's Best Dental Science College, Madurai, Tamil Nadu, India.

Background: The principles of minimally invasive dentistry clearly tells us the need for clinically effective measures to remineralize the early enamel caries lesions.

Aims And Objectives: The aim of this study was to evaluate the remineralisation potential of four different remineralisation agents used quantitatively by surface microhardness and qualitatively by energy dispersive X ray analysis.

Materials And Methods: Artificial enamel lesions were created on the buccal surfaces of 60 extracted mandibular second premolar. Read More

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February 2021

Comparative analysis of bond strength and microleakage of newer generation bonding agents to enamel and dentin: An study.

J Conserv Dent 2020 Nov-Dec;23(6):593-597. Epub 2021 Feb 11.

Department of Oral and Maxillofacial Surgery, Dental College, JNIMS, Imphal, Manipur, India.

Aims: This study aims to evaluate the bond strength (BS) and microleakage (ML) of the newer bonding agents to enamel and dentin.

Objective: (1) To analyze the BS between self-etch and total-etch adhesives. (2) To analyze the depth of ML between self-etch and total-etch adhesives. Read More

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February 2021

Decompression effects on bone healing in rat mandible osteomyelitis.

Sci Rep 2021 Jun 3;11(1):11673. Epub 2021 Jun 3.

Department of Oral and Maxillofacial Surgery, Dental Research Institute, School of Dentistry, Seoul National University, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Korea.

Osteomyelitis (OM) of the jaw is usually caused by a chronic odontogenic infection. Decompression is the release the intraluminal pressure in the cystic cavity allowing gradual bone growth from the periphery. The aim of this study was to analyze the effectiveness of decompression in an OM jaw model. Read More

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Retentive Forces of Removable Partial Denture Clasp Assemblies Made From Polyaryletherketone and Cobalt-Chromium: A Comparative Study.

J Prosthodont 2021 Jun 3. Epub 2021 Jun 3.

Research Department, Naval Postgraduate Dental School, Naval Medical Leader & Professional Development Command; Postgraduate Dental College, Uniformed Services University of Health Sciences, Bethesda, MD.

Purpose: To compare retentive forces of removable partial denture clasps traditionally fabricated with cobalt-chromium (CoCr) material and two computer-aided design and computer-aided manufactured (CAD/CAM) thermoplastic polymers.

Materials And Methods: 48 clasp assemblies (16 CoCr, 16 polyetheretherketone (PEEK) and 16 polyetherketoneketone (PEKK) thermoplastic polymer) were fabricated for 48 mandibular tooth analogs. Individual clasps were inserted and removed on the tooth analogs utilizing a chewing simulator for 15000 cycles to simulate 10 years of use. Read More

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Factors Affecting Future Caries Occurrence Among Preschoolers in Northern Guangdong: A Longitudinal Study.

Clin Epidemiol 2021 25;13:345-355. Epub 2021 May 25.

Stomatological Hospital, Southern Medical University, Guangzhou, People's Republic of China.

Purpose: This study aimed to investigate the new development of caries among preschoolers in northern Guangdong and to assess caries-related factors to distinguish groups with different caries risk levels.

Methods: Baseline data were recorded for participants from September to November 2019, and participants were reexamined from September to November 2020. A longitudinal observation of 11,973 preschoolers was conducted. Read More

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Mineralized Plasmatic Matrix in Ridge Preservation: A Randomized Controlled Clinical Trial.

Int J Periodontics Restorative Dent 2021 May-Jun;41(3):e103-e112

Clinical evidence suggests using lateral and vertical ridge preservation procedures to make dental implant placement possible. This study evaluates and compares the radiographic and volumetric changes following ridge preservation procedures using either mineralized plasmatic matrix grafts (MPM) or bone grafts alone (non-MPM) in the existing crestal ridges of sockets in maxillary and mandibular regions using CBCT scans. Healthy volunteers (n = 26) were recruited and randomized into MPM and non-MPM groups (n = 13 patients per group). Read More

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An in vivo, randomized, controlled comparative evaluation of efficacy, hemodynamic changes, and postoperative complications of 4% articaine using buccal infiltration and 2% lidocaine using inferior alveolar nerve block in mandibular primary molars of children aged 6 to 8 years.

Quintessence Int 2021 Jun 2;0(0). Epub 2021 Jun 2.

Objective: To compare and evaluate the efficacy, hemodynamic changes, and postoperative complications of 4% articaine using buccal infiltration and 2% lidocaine using inferior alveolar nerve block in mandibular primary molars of children aged 6 to 8 years.

Method And Materials: 100 participants were randomly distributed to receive either 4% articaine using infiltration anesthesia or 2% lidocaine using inferior alveolar nerve block on each side of the mandibular arch, in two different appointments, after a 1-week interval. The pain perception was evaluated using visual analog scale (VAS) and Wong-Baker Faces pain rating scale (WBFPRS). Read More

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Influence of PRGF and PRF on postextractive alveolus regeneration: a randomised controlled trial.

Quintessence Int 2021 Jun 2;0(0). Epub 2021 Jun 2.

Objectives: Healing of postextraction alveolus is a complex process that involves soft and hard tissue regeneration. Pain, swelling, difficulty in opening the mouth, delayed bone tissue healing, alveolitis, and horizontal or vertical resorption of bone tissue are the main problems that impact on consequent treatment. Blood concentrates PRGF (plasma rich in growth factors) and PRF (platelet-rich fibrin), which are rich in growth factors, create better conditions for postextraction alveolus healing, enhance quality of soft tissues and bone regeneration, and decrease pain. Read More

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Evaluation of type of kinematics on glide path procedures and torsional fatigue resistance after preparation of moderately curved canals.

Braz Oral Res 2021 31;35:e064. Epub 2021 May 31.

Universidade de São Paulo - USP, Bauru School of Dentistry, Department of Dentistry, Endodontics and Dental Materials, Bauru, SP, Brazil.

Sixty moderately curved canals of mandibular molars classified as Vertucci's type IV canal configuration were selected by micro-CT 1174. The teeth were divided into two groups according to the kinematics used, whether reciprocating or rotary motion (n=30, totaling 60 mesial root canals). The instruments used to perform the glide path procedures had identical features (0. Read More

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A Pilot Retrospective Study on the Effect of Bone Grafting after Wisdom Teeth Extraction.

Materials (Basel) 2021 May 26;14(11). Epub 2021 May 26.

Department of Surgical Sciences and Integrated Diagnostics, University of Genoa, 16100 Genoa, Italy.

This study aimed to retrospectively investigate the effect of bone graft after extraction of wisdom teeth impacting with the distal aspect of the second molar, on soft tissue wound healing, bone loss, and periodontal parameters. Sixteen patients treated an for impacted mandibular wisdom tooth at least one year ago were re-called (18 teeth). Dental panoramic tomography and periodontal parameters were assessed. Read More

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