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Analysis of Factors Related to Distal Proximal Caries on the Distal Surface of the Mandibular Second Molar Induced by an Impacted Mandibular Third Molar.

Int J Gen Med 2021 20;14:3659-3667. Epub 2021 Jul 20.

Department of Dentistry, Affiliated Hospital of Yanbian University, Yanji, Jilin, 133000, People's Republic of China.

Objective: To analyze the factors related to distal proximal caries of the mandibular second molar (MSM) induced by an impacted mandibular third molar (MTM).

Methods: A total 500 panoramic radiographs of patients with impacted MTMs who were treated in the Department of Stomatology of the Affiliated Hospital of Yanbian University between October 2017 and October 2019 were selected. Descriptive and bivariate analyses were conducted, and the diagnosis of caries in the MSM and the position of the MTM were evaluated. Read More

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Signs and Symptoms of Primary Tooth Eruption in Preterm and Low Birth Weight Children.

J Dent Child (Chic) 2021 May;88(2):94-100

Dr. Bendo is a adjunct professor, Department of Pediatric Dentistry, School of Dentistry, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil;, Email:

To evaluate signs and symptoms associated with the eruption of the primary mandibular central incisors in preterm and low birth weight (PLBW) children.
A prospective longitudinal study was performed with 46 PLBW Brazilian children in a university hospital with a 10-month follow-up. Signs and symptoms of tooth eruption were recorded monthly by clinical examination and caregivers' report. Read More

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Cementifying Fibroma of the Sphenoid Wing in a Child: A Case Report.

J Pediatr Neurosci 2021 Jan-Mar;16(1):49-54. Epub 2021 Jun 25.

Departmentt of Neurosurgery, Brains Hospital, Bangalore, Karnataka, India.

"Cementifying fibroma" is a benign tumor of the fibroblastic tissue containing masses of cementum-like calcified tissue, usually occurring between the third and fourth decades. Cementifying-ossifying fibromas are rare non-odontogenic, fibro-osseous tumors of the periodontal ligament that arise from the mesodermal germ layer. We report a 12-year-old male child, who presented with a swelling in the left temporal region near the angle of the left eye. Read More

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Deep learning-based evaluation of the relationship between mandibular third molar and mandibular canal on CBCT.

Clin Oral Investig 2021 Jul 27. Epub 2021 Jul 27.

Center for TMD and Orofacial Pain, Department of Oral and Maxillofacial Radiology, Peking University School and Hospital of Stomatology, No. 22 Zhong Guan Cun South Ave, Beijing, 100081, People's Republic of China.

Objectives: The objective of our study was to develop and validate a deep learning approach based on convolutional neural networks (CNNs) for automatic detection of the mandibular third molar (M3) and the mandibular canal (MC) and evaluation of the relationship between them on CBCT.

Materials And Methods: A dataset of 254 CBCT scans with annotations by radiologists was used for the training, the validation, and the test. The proposed approach consisted of two modules: (1) detection and pixel-wise segmentation of M3 and MC based on U-Nets; (2) M3-MC relation classification based on ResNet-34. Read More

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Can Kinesio taping improve discomfort after mandibular third molar surgery? A systematic review and meta-analysis.

Clin Oral Investig 2021 Jul 23. Epub 2021 Jul 23.

Department of Orthodontics, Ningbo Stomatology Hospital, 315000, Ningbo, China.

Objective: The purpose of this study was to evaluate whether Kinesio taping (KT) can improve patient discomfort after mandibular third molar surgery.

Materials And Methods: This systematic review and meta-analysis was conducted according to the PICO strategy. We searched 4 databases for related articles. Read More

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Management of Intracanal Separated File Fragment in a Four-Rooted Mandibular Third Molar.

Case Rep Dent 2021 30;2021:5547062. Epub 2021 Jun 30.

Department of Conservative Dentistry and Endodontics, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu, India.

The success of endodontic therapy is attributed to complete arbitration of the bound entities concealed within the complexity and absolute disinfection of the root canal system, thus, deeming it mandatory to effectively negotiate and overcome the challenges posed by obstruction, either iatrogenic or anatomic. To achieve this, considerable depth of knowledge and expertise with reference to variations in root canal morphology and clinical mishap management is substantially as important as developing fine observation skills in conjunction with an appropriate armamentarium and a keen sense of determination, thereby enhancing one's clinical acumen by several folds. In the present case, following rubber dam isolation, the temporary restoration was removed, and the remaining carious dentin was excavated. Read More

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A comparison of the effects of two orthodontic techniques in the orthodontic treatment of sagittal skeletal patterns.

Am J Transl Res 2021 15;13(6):6221-6228. Epub 2021 Jun 15.

Department of Stomatology, Haikou Third People's Hospital Haikou 570105, Hainan, China.

Objective: To compare the differences in the amount of dental root resorption (DRR) measured using different orthodontic techniques in the orthodontic treatment of patients with different sagittal skeletal patterns.

Methods: Ninety-three patients undergoing orthodontic treatment were randomly divided into group A (n=46) and group B (n=47). Group A was treated with bracketless invisible orthodontics and group B was treated using the self-ligating fixed orthodontic technique. Read More

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The Mandibular and Hyoid Arches-From Molecular Patterning to Shaping Bone and Cartilage.

Int J Mol Sci 2021 Jul 14;22(14). Epub 2021 Jul 14.

Department of Developmental Biology, Institute of Experimental Medicine of the Czech Academy of Sciences, 14220 Prague, Czech Republic.

The mandibular and hyoid arches collectively make up the facial skeleton, also known as the viscerocranium. Although all three germ layers come together to assemble the pharyngeal arches, the majority of tissue within viscerocranial skeletal components differentiates from the neural crest. Since nearly one third of all birth defects in humans affect the craniofacial region, it is important to understand how signalling pathways and transcription factors govern the embryogenesis and skeletogenesis of the viscerocranium. Read More

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Repair of teeth with cracks in crowns and roots: An observational clinical study.

Int Endod J 2021 Jul 22. Epub 2021 Jul 22.

Head and Neck Department, "Fondazione Policlinico Universitario IRCCS", Rome, Italy.

Aim: This retrospective observational study investigated the survival rate of teeth with radicular cracks that were restored using composite materials.

Methodology: The study was approved by the Ethical Committee of Sistema Sanitario Nazionale (prot. N°2370CELazio1), Clinicaltrials. Read More

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Pattern of third molar impactions in north-eastern peninsular Malaysia: A 10-year retrospective study.

Niger J Clin Pract 2021 Jul;24(7):1028-1036

Oral Medicine Unit, Shaheed Zulfiqar Ali Bhutto Medical College, Islamabad, Pakistan.

Background: Third molar impaction, if left untreated, has the potential to cause several complications. The evaluation of surgical difficulty of impacted third molar extraction aids in better formulation of treatment plan by minimizing surgical complications.

Objective: This study aimed to determine the prevalence of third molar impaction and related pathologic conditions in a cohort of patients living in North-eastern Peninsular Malaysia. Read More

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The effects of a corticotomy on space closure by molar protraction using TSADs in patients with missing mandibular first molars.

Orthod Craniofac Res 2021 Jul 20. Epub 2021 Jul 20.

Associate professor and Chair, Department of Orthodontics, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.

Introduction: The purpose of this study was to evaluate the effects of a triangular-shaped corticotomy on the protraction of second and third molars in patients with missing mandibular first molars.

Subjects And Methods: The corticotomy and non-corticotomy groups consisted of sixteen first molars in fifteen patients (28.6 ± 9. Read More

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Do anatomical variations of the mandibular canal pose an increased risk of inferior alveolar nerve injury after third molar removal?

Clin Oral Investig 2021 Jul 19. Epub 2021 Jul 19.

OMFS-IMPATH Research Group, , Department of Imaging and Pathology, Faculty of Medicine, University of Leuven, and Department of Oral and Maxillofacial Surgery, University Hospitals Leuven, Kapucijnenvoer 7 blok a, 3000, Leuven, Belgium.

Objectives: The present study aimed to assess whether anatomical variations of the mandibular canal are associated with neurosensory disturbances of the inferior alveolar nerve (IAN) following mandibular third molar removal.

Methods: Two observers compared the detection of third molar root-nerve relations and bifurcations of the mandibular canal on panoramic radiographs and CBCT images of 201 patients undergoing removal of 357 mandibular third molars. Potential neurosensory disturbances of the IAN were surveyed ten days after surgery. Read More

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Diagnostic accuracy of CBCT compared to panoramic radiography in predicting IAN exposure: a systematic review and meta-analysis.

Clin Oral Investig 2021 Jul 17. Epub 2021 Jul 17.

Department of Surgery, Stomatology, Pathology, and Radiology, Bauru School of Dentistry, University of São Paulo, Alameda Octávio Pinheiro Brisola, 9-75, Bauru, São Paulo, 17012-901, Brazil.

Objectives: The aim of this study is to verify whether the diagnostic accuracy of cone beam computed tomography (CBCT) is superior to panoramic radiography (PR) in predicting inferior alveolar nerve (IAN) exposure during the lower third molar extraction.

Materials And Methods: Eight electronic databases were searched up to September 2020. Studies that evaluated the accuracy (sensitivity, specificity, positive-predictive value, and negative predictive value) of both imaging methods were included. Read More

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Sympathetic Nerve Activity During Tooth Extraction in Women Is Related to Dental Anxiety Immediately After Surgery.

J Oral Maxillofac Surg 2021 Jun 18. Epub 2021 Jun 18.

Professor, Department of Dental Anesthesiology, Field of Oral Maxillofacial Rehabilitation, Developmental Therapeutics Course, Graduate School of Medical and Dental Sciences.

Purpose: This study assessed the relationship between changes in autonomic nervous system activity during impacted mandibular third molar extraction and a patient's postoperative psychological status, with the overarching aim of informing the development of interventions to reduce dental phobia and anxiety. We hypothesized that changes in autonomic nervous system activity during tooth extraction are related to postoperative psychology.

Methods: In our prospective cohort study, heart rate variability, heart rate (HR), and systolic blood pressure (SBP) were recorded during impacted mandibular third molar extraction. Read More

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Determination of Extra Craniofacial Abnormalities in Patients With Craniofacial Microsomia Visceral malformations and CFM.

J Craniofac Surg 2021 Jul 14. Epub 2021 Jul 14.

Complexo Hospital de Clínicas, Federal University of Parana, Curitiba Federal University of Paraná Assistance Center for Cleft Lip and Palate, Hospital do Trabalhador, Curitiba, Brazil.

Introduction: Craniofacial microsomia (CFM) is caused by abnormalities in the development of the first and second pharyngeal arches. One-third to half of the patients with CFM also present with extra craniofacial (ECF) malformations. The knowledge of the visceral alteration related to CFM is vital for optimized care and a better prognosis. Read More

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A Rare Case of Multiple Internal Root Resorption after the Delayed Treatment of a Traumatic Injury: A Case Report.

J Contemp Dent Pract 2021 Feb 1;22(2):194-198. Epub 2021 Feb 1.

Department of Endodontics, Israel Defense Forces (IDF) Medical Corps, Tel HaShomer, Israel.

Aim: The objective of this case report was to present a rare case of simultaneous multiple internal root resorption (IRR) in four mandibular incisors and discuss the possible etiology and suitable armamentarium for its treatment based on different morphological considerations.

Background: IRR in permanent dentition is a rare pathological condition and its etiology is not yet fully understood. Very few cases of multiple IRR were reported. Read More

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February 2021

Comparison of Canal Transportation in TruNatomy, ProTaper Gold, and Hyflex Electric Discharge Machining File Using Cone-beam Computed Tomography.

J Contemp Dent Pract 2021 Feb 1;22(2):117-121. Epub 2021 Feb 1.

Department of Conservative Dentistry and Endodontics, Saraswati Dental College, Lucknow, Uttar Pradesh, India.

Aim: This study was carried out to compare canal transportation in three new rotary file systems, namely TruNatomy, ProTaper Gold, and Hyflex Electric Discharge Machining file system, using cone-beam computed tomography.

Materials And Methods: The study was conducted on 105 extracted teeth consisting of 60 extracted mandibular first molars and 45 mandibular second premolars involving the mesiolingual canal of mandibular first molar and the root canal of second premolar. The teeth were randomly divided into three groups of 35 out of which each group consisted of 20 mandibular first molars and 15 mandibular second premolars. Read More

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February 2021

Age estimation based on Willems method versus country specific model in Saudi Arabia children and adolescents.

BMC Oral Health 2021 Jul 13;21(1):341. Epub 2021 Jul 13.

Department of Oral Health Sciences, KU Leuven & Dentistry, University Hospitals Leuven, Leuven, Belgium.

Background: The aims of this study were to create a method for estimation of dental age in Saudi children and adolescents based on the Willems model developed using the Belgian Caucasian (BC) reference data and to compare the ability of the two models to predict age in Saudi children.

Methods: Development of the seven lower left permanent mandibular teeth was staged in 1146 panoramic radiographs from healthy Saudi children (605 male, 541 female) without missing permanent teeth and without all permanent teeth fully developed (except third molars). The data were used to validate the Willems BC model and to construct a Saudi Arabian-specific (Willems SA) model. Read More

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Efficacy and safety of single-dose DFN-15 for treatment of acute postsurgical dental pain: a randomized, double-blind, placebo-controlled study.

Pain 2021 Apr 12. Epub 2021 Apr 12.

Lotus Clinical Research, Pasadena, CA, United States JBR Clinical Research, Salt Lake City, UT, United States Dr Reddy's Laboratories, Princeton, NJ, United States.

Abstract: The analgesic efficacy and safety of DFN-15, a new oral liquid formulation of celecoxib with more rapid absorption than the capsule, were evaluated in the treatment of acute pain in adult patients after dental surgery. In this randomized, double-blind, placebo-controlled, dose-ranging study, 120 otherwise healthy adults who underwent the extraction of bilateral impacted mandibular third molar teeth and experienced moderate to severe pain postsurgery were randomly assigned, in a 1:1:1:1 ratio, to receive one dose of either placebo or DFN-15 at 3 doses: 62.5, 125, and 250 mg. Read More

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Central mucoepidermoid carcinoma arising directly from a glandular odontogenic cyst of the mandible: a case report.

Diagn Pathol 2021 Jul 11;16(1):61. Epub 2021 Jul 11.

Division of Oral Pathology, Department of Tissue Regeneration and Reconstruction, Faculty of Dentistry, Niigata University Graduate School of Medical and Dental Sciences, 2-5274 Gakkoucho-dori, Chuo-ku, 951-8514, Niigata, Japan.

Background: Central mucoepidermoid carcinoma (MEC) is a rare salivary gland tumor that affects the jawbone. Glandular odontogenic cyst (GOC) is also a rare odontogenic developmental cyst with glandular differentiation. GOC shares some histological features with central MEC, and a pre-existing GOC can develop into central MEC. Read More

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Consecutive tooth agenesis patterns in non-syndromic oligodontia.

Odontology 2021 Jul 8. Epub 2021 Jul 8.

Department of Orthodontics, School of Life Dentistry At Tokyo, The Nippon Dental University, 1-9-20 Fujimi, Chiyoda-ku, Tokyo, 102-8159, Japan.

Agenesis of two or more consecutive adjacent permanent teeth (consecutive tooth agenesis, CTA) is a serious manifestation of oligodontia requiring long-term, multi-disciplinary treatment. Therefore, the present study investigated the characteristics of the CTA pattern in orthodontic patients with non-syndromic oligodontia. Using panoramic radiographs, the number of agenetic permanent teeth excluding third molars in non-syndromic orthodontic patients was evaluated, and patients with six or more agenetic teeth (oligodontia group, n = 97) and with one to five agenetic teeth (hypodontia group, n = 107) were selected. Read More

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Keratocystic Odontogenic Tumor Associated with Impacted Molar in the Maxillary Sinus Causing Osteomyelitis.

S D Med 2021 Mar;74(3):102-104

University of South Dakota Sanford School of Medicine, Yankton, South Dakota.

Keratocystic odontogenic tumors are cystic masses that arise from cells involved in tooth development. These lesions can be very locally aggressive and have a remarkable rate of recurrence. This combination of traits necessitates aggressive treatment and monitoring. Read More

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Intraoral Management of Latrogenic Tooth Displacement: A Report of Two Cases and a Brief Review of Literature.

Contemp Clin Dent 2021 Apr-Jun;12(2):187-190. Epub 2021 Jun 14.

Department of Oral and Maxillofacial Surgery, Dr. R Ahmed Dental College and Hospital, Kolkata, West Bengal, India.

Iatrogenic displacement of a tooth or tooth fragment is a rare but well-recognized complication that occurs during exodontia. The most common sites of dislodgment of a mandibular third molar fragment are the sublingual, submandibular, and pterygomandibular and lateral pharyngeal spaces. Removal of a displaced tooth from these spaces may be complex due to poor visualization and limited access. Read More

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Appearance of Mandibular Para-radicular Third Molar Radiolucencies on Cone-Beam Computed Tomography.

Contemp Clin Dent 2021 Apr-Jun;12(2):128-132. Epub 2021 Jun 14.

Department of Oral and Maxillofacial Radiology, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran.

Aims: Mandibular para-radicular third molar radiolucencies (MPRs) may be mistaken for pathological lesions, leading to misdiagnosis and mistreatment. This study sought to assess the appearance of MPRs on cone-beam computed tomography (CBCT).

Settings And Design: This was a descriptive, cross-sectional study. Read More

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Comparative Evaluation of Esthetic and Structural Aspects in Class II Functional Therapy. A Case-Control Retrospective Study.

Int J Environ Res Public Health 2021 Jun 29;18(13). Epub 2021 Jun 29.

Department of Oral and Maxillofacial Sciences, Sapienza University of Rome, 00161 Rome, Italy.

To compare the skeletal, dental, and esthetic changes produced by three functional devices, Fränkel-2 appliance (FR-2), Twin Block (TB), and Occlus-o-Guide (O-o-G), for the treatment of Class II malocclusion. : Sixty-five patients with Class II Division 1 malocclusion were divided into three groups and were analyzed through cephalometric analysis of skeletal, dental, and esthetic variables before and after treatment. The first group of 23 patients (F: 9; M: 14; mean age: 10. Read More

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Evaluation of the Effect of Surgical Extraction of an Impacted Mandibular Third Molar on the Periodontal Status of the Second Molar-Prospective Study.

J Clin Med 2021 Jun 16;10(12). Epub 2021 Jun 16.

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

Dental injury to the second molar (SM) caused by the surgical extraction of the impacted third molar tends to be underestimated. The necessity of assessment of the impact of the removal of the wisdom tooth in the mandible on the second molar arose. The study group ( = 60) was the one with the second molar on the surgical side, and the control group ( = 60) was the one with the tooth on the opposite side of the alveolar arch. Read More

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Is the Jaw Bone Micro-Structure Altered in Response to Osteoporosis and Bisphosphonate Treatment? A Micro-CT Analysis.

Int J Mol Sci 2021 Jun 18;22(12). Epub 2021 Jun 18.

Department of Oral Health Sciences & Restorative Dentistry, KU Leuven & UZ Leuven, 3000 Leuven, Belgium.

The aim of the study was to quantify the micro-architectural changes of the jaw bone in response to ovariectomy, exposed or not to bisphosphonate treatment. A total of 47 Wistar rats were ovariectomized (OVX) or sham-operated (shOVX) and exposed to osteoporosis preventive treatment for eight weeks either with bisphosphonates (alendronate, ALN; group OVX-ALN) three days/week at a dose of 2 mg/kg or with saline solution (untreated control condition; group OVX). The bone morphometric parameters of the trabecular jaw bone were assessed using ex vivo micro-computed tomography. Read More

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Does the Coronectomy a Feasible and Safe Procedure to Avoid the Inferior Alveolar Nerve Injury during Third Molars Extractions? A Systematic Review.

Healthcare (Basel) 2021 Jun 18;9(6). Epub 2021 Jun 18.

Oral Surgery Department, Universidade Federal Fluminense, Niteroi 24020-140, Brazil.

This systematic review aimed to review the literature on the coronectomy technique and evaluate the incidence of success and complications as a surgical approach for inferior third molars. Online databases were searched for data on the frequency of inferior alveolar nerve damage, lingual nerve damage, root migration, pain, infection, dry socket, and extraction of the remaining root, and data on the necessity of reintervention were also extracted. Randomized clinical trials, controlled clinical trials, prospective cohort studies, and prospective and retrospective studies with or without the control group were intercepted. Read More

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The Pattern of Mandibular Third Molar Impaction and Assessment of Surgery Difficulty: A Retrospective Study of Radiographs in East Baltic Population.

Int J Environ Res Public Health 2021 06 3;18(11). Epub 2021 Jun 3.

Department of Oral Surgery, Pomeranian Medical University in Szczecin, Powstańców Wielkopolskich 72/18, 70-111 Szczecin, Poland.

Classifications of impacted teeth allow defining the type and degree of retention, as well as assessing the degree of difficulty of the procedure. The aim of this study was to conduct retrospective analysis of the degree of retention and difficulty in the surgical removal of impacted mandibular third molars in the clinical material of the Department of Oral Surgery in 2013-2018. This study included 1585 dental panoramic radiographs of patients of the Department of Oral Surgery, who reported in 2013-2018, in order to perform surgical removal of the impacted mandibular third molar. Read More

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Evaluation of Vitamin D (25OHD), Bone Alkaline Phosphatase (BALP), Serum Calcium, Serum Phosphorus, Ionized Calcium in Patients with Mandibular Third Molar Impaction. An Observational Study.

Nutrients 2021 Jun 4;13(6). Epub 2021 Jun 4.

Clinical Pathology Unit, Polyclinic of Bari, 70124 Bari, Italy.

The aim of this study was to evaluate the levels of vitamin D (25OHD) and other bone biomarkers in patients with third molar impaction (TMI). Thirty males and 30 females with unilateral or bilateral impacted mandibular third molar, and 15 males and 15 females as a control group (CG) were recruited. Rx-OPT was used to evaluate dental position and Pederson index to measure the difficulty of the intervention. Read More

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