Ghassem Ansari

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Verified

Ghassem verified their affiliation via an institutional email.

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• PhD from Glasgow University
• Clinical Prosessor and Program Director at University of California, Los Angeles

Background: The study compared the fracture resistance of bulk fill composite restorations of anterior primary teeth using four different reinforcement methods. Methods: Forty-eight extracted human maxillary primary incisors were randomly divided into four groups: The first group was the conventional composite posts (CCP), the second group was the...

Statement of the Problem Treatment of immature necrotic teeth is a problematic situation. Conventional root canal therapy is challenging and leaves a weak, fragile, and undeveloped tooth for lifetime. Purpose This review was aimed to assess the outcome of available randomized clinical trials (RCTs) on the efficacy of platelet concentrates (PC) in...

Background: Conscious sedation has gained more popularity these days, with different routes of drug administration having various advantages and disadvantages. Among all, ketamine is one of the most commonly used drugs in children. Objectives: The aim of the present study was to compare 2 different routes of ketamine administration - intranasal...

Statement of the Problem One of the main obstacles in dealing with pediatric patients is patients’ lack of cooperation when undergoing dental treatment. Providing a safe yet effective method to tackle such a problem is a priority of today’s pediatric dentistry. Purpose The aim of this study was to compare the sedative effect of 3 and 5 mg/kg intra...

Background: Microcephalic Osteodysplastic Primordial Dwarfism type 2 (MOPD II) is a rare untreatable genetic disorder characterized by severe prenatal and postnatal growth retardation, microcephaly, bird-headed face (receding forehead and chin, a beaklike nose, and prominent eyes), skeletal abnormalities, abnormal dentition, abnormal hair and skin...

Offers a comprehensive collection of cases using cone beam computed tomography (CBCT) in a clinical practice Includes over 300 high-quality CBCT scans with succinct descriptions Presents a variety conditions such as normal anatomy, anomalies, and inflammatory and degenerative diseases Includes best slices (multiplanar reformatting (MPR), maximum in...

Aim and Background Restoration of severely damaged primary anterior teeth are deemed as serious challenges for pediatric dentists. The aim of this study was to evaluate the fracture resistance of primary canines restored with flowable or packable composite resin posts. Material and Methods This study was conducted on a group of extracted primary c...

Background: Mineral trioxide aggregate (MTA) is known as a common biomaterial for pulpotomy of primary molars, with limitation including high cost, difficult handling, and long setting time. This study was conducted to compare the clinical and radiographic success rate of Allium sativum oil and MTA in pulpotomy of primary molar teeth. Materials and...

CBCT is the modality of choice for preoperative evaluation of alveolar ridge in order to carry out dental implant placement. Cross‐sectional images provide useful information regarding available ridge bone, potential sites for implant insertion, and possible anatomic limitations and graft requirements. This chapter offers a selection of ridge measu...

Foreign bodies are often encountered by oral and maxillofacial radiologists in patients' CBCT scans, and in many cases the patient is not aware of them at all. However, not all foreign body objects can be detected on CBCT scan (due to the object's characteristics and CBCT contrast resolutions), giving rise to the need for supplementary imaging such...

Soft tissue calcifications and ossifications in the maxillofacial region are relatively common in the general population and are generally detected in routine radiographic examinations as incidental findings. Knowledge of the prevalence and nature of these calcifications is necessary in order to interpret any maxillofacial radiographic examination....

The anatomy of tooth, made of enamel, dentin, and cementum, and of the surrounding periodontium can be thoroughly assessed on CBCT scans. This imaging modality can detect any dental anomalies, difficulties in eruption, root resorption, root dilacerations, and proximity to anatomic structures three dimensionally and with no superimposition. In this...

The CBCT imaging modality has several recognized indications in various fields of dentistry, such as endodontics, periodontics, and orthodontics. This chapter presents the application of this three‐dimensional imaging technology in the diagnosis of accurate root canal morphology, number, possible calcification and abnormalities, complications durin...

Craniofacial anomalies are caused by the disruption of normal development and growth paths in craniofacial structures with genetic or environmental etiologies. CBCT scans provide low‐dose high‐resolution 3D images for the evaluation of the affected craniofacial structures and allow clear visualization of these anomalies. Accurate assessment of osse...

CBCT is an innovative medical imaging technology providing accurate three‐dimensional images, mainly of hard tissues. Various CBCT devices are now available, specifically designed for dentistry applications including implant treatment planning, orthodontics, endodontics, oral surgery and pathology, periodontics, and temporomandibular joint (TMJ) as...

Artifacts are commonly seen distortions in CBCT scans that can seriously degrade the quality of the image. Furthermore, they may obscure or even simulate a pathologic lesion. Since artifacts may interfere with appropriate diagnosis and treatment planning, every practitioner should be aware of their presence. This chapter aims to present various typ...

The paranasal sinuses are four paired sets of air‐filled cavities surrounded by high‐density osseous structure of maxillofacial skeleton. Due to this high subject contrast, CBCT can accurately assess sino‐nasal morphology, structural integrity, and internal opacification. Various pathologies, such as presence of retention pseudocyst, mucositis, sin...

The inferior alveolar nerve canal is visible on CBCT scans of the mandible, coursing from the mandibular foramen in the ramus to the mental foramen in the body. Mapping of this nerve canal is crucial, especially in maxillofacial surgeries and implant insertion. Such tracing can be clearly shown on low‐thickness reformatted panoramic image and cross...

CBCT is a valuable tool in assessments of dental lesions and osseous pathologies in the maxillofacial skeleton and provides superior three‐dimensional diagnostic information compared to conventional 2D radiographs. Different lesions and neoplasms, such as inflammatory conditions, cysts, benign or malignant tumors, paranasal sinus disorders, and sof...

Contemporary knowledge regarding CBCT and its proper application guides the practitioner toward improvement in diagnostics and treatment planning. Any intervention prior to capturing a CBCT scan can be counted as interventional CBCT (e.g., CBCT sialography, fistulography, sinus tract tracing, cystography). The aim of this chapter is to present vari...

CBCT is a quick, easy, and useful three‐dimensional imaging modality in assessing maxillofacial fracture and further treatment planning considerations, with substantially lower radiation dose and cost compared to multidetector computed tomography (MDCT). In addition, CBCT is the modality of choice for evaluation of limited dento‐alveolar fracture....

Clinicians use CBCT scans to localize the anatomic structures of the maxillofacial region and to visualize the region precisely in the main axial, coronal, and sagittal planes. CBCT units provide choices in field of view (FOV) selection, allowing irradiation of a specific area of interest while limiting irradiation of other tissues. In many circums...

Imaging diagnostics of diseases of the temporomandibular joint (TMJ) is complicated as this complex anatomical structure may contain not only intrinsic lesions but also diseases affecting the joint from the temporal bone and mandibular ramus sides. There are numerous approaches to imaging diagnosis of the TMJ allowing visualization of the hard and...

Pulmonary atresia with ventricular septal defect (PA/VSD) is one of the congenital heart diseases that results in cyanosis, susceptibility to bacterial endocarditis, and increased risk of complications during general anesthesia. Glucose-6-phosphate dehydrogenase (G6PD) deficiency is the most common inherited genetic disorder affecting the red blood...

Aim: The purpose of this investigation was to evaluate the association of physicochemical properties and antimicrobial peptide levels of saliva with caries activity in children. Materials and methods: The required volume of unstimulated saliva was collected from 41 children aged 3-12 years with no systemic diseases. Caries activity was calculate...

Clinical applications of hydraulic calcium silicate–based biomaterials in paediatric endodontics Nowadays, in order to prevent the early loss of cariously or traumatically damaged teeth in paediatric dentistry, different types of endodontic treatments are considered. Over the past decade, paediatric dentistry has primarily shifted its focus towards...

Aims: This study was aimed to assess the efficacy of wet and dry brushing on cleaning outcome of tooth surfaces. Methods: Forty-three children aged 10-12 years were randomly selected and instructed for this brushing project. Each case served as self-control. Each patient was requested to brush through one of the wet/dry techniques for 1 week and...

The problem of disturbed enamel and dentine formation leading to structural defects (anomalies) is important for dental surgeons who are dealing with the clinical features of such anomalies in their daily practice. The degree of defect may vary from minor to extensive, affect one or more dental structures, and will be affected by both the severity...

Etiology and the stage of teeth development govern the outcome of the defective tissue. Tooth formation involves a series of developmental processes, and any disturbance in these processes could lead to defects proportionate to the severity and timing of the disturbance. There are minor variations in tooth sizes between races and sexes. Changes in...

The oral cavity consists of soft and hard tissues. The lips, cheeks, tongue, gingivae, palate, and tonsils are the former, while the teeth are the latter. The lips are composed of the muscular layer of orbicularis oris, connective tissue, dermis, and mucosa. The palate is divided into two major parts ‐ soft and hard palate. The tongue is a muscular...

Various defects can develop in the tooth structures depending on the causative agent and its relationship to the stage of the tooth formation and calcification. The classification of defects in teeth varies and is based on the different structures involved. This chapter discusses the most common classifications used by dental professionals and scie...

Eruption consists of a series of events from initiation of coronal formation and the beginning of root formation until each tooth emerges into the mouth in a specific position. Certain diseases and syndromes can affect tooth eruption, predominantly delayed eruption. Eruption of each primary and permanent tooth is based on an exact and predetermined...

The aim of this systematic review and subsequent meta-analysis was to elaborate the efficacy of laser pulpotomy over theformocresol pulpotomy of human primary teeth. Published materials in the MedLine were looked for through BPUBMED^ andBPUBMED CENTRAL^. The MESH terms of BLaser^, BPulpotomy^, BPrimary teeth^, and BChildren^ were used to carry thes...

Enamel is the strongest structure in both humans and animals, and consists of minerals and water. Microscopic views reveal that it consists of “enamel rods” that are formed of bundles of hydroxyapatite crystals. This chapter presents information on tooth histology, discussing enamel, dentine, cementum, dental pulp, and periodontium. The bulk of the...

Aim:The aim of this investigation was to compare the effect of Midazolam/Chloral hydrate with Midazolam/promethazin in fearfull children needing dental treatments. Method: This crossover double blind clinical trial was conducted on 30 children aged 2-6 years needing two similar dental treatments for two visit comparisons. Pre during and post sedati...

Background and aims: The aim of this investigation was to evaluate clinical and radiographic effects of diode laser pulpotomy on young human primary molars. Materials and methods:This double-blind, split-mouth randomized clinical trial was conducted on 14 children, aged 3-9 years. In total, 20 pairs of teeth were selected from those with pulpal exp...

Objectives This study aimed to evaluate the effect of oral melatonin and oral midazolam as premedication for intravenous (IV) sedation of pediatric dental patients. Materials and Methods This crossover, double-blind randomized clinical trial was conducted on 23 uncooperative 2–6-year-olds with definitely negative behaviors according to the Frankl'...

Objectives: The aim of this study was to compare the intranasal premedication effect of newly introduced dexmedetomidine (DEX) versus midazolam on the behavior of uncooperative children in the dental clinic. Materials and methods: This crossover double-blind clinical trial was conducted on 20 uncooperative children aged 2-6 years who required at...

Introduction This trial was designed to evaluate the clinical and radiographic success rates of calcium-enriched mixture (CEM) cement with and without low level laser therapy (LLLT) and compare them to that of formocresol (FC) and ferric sulfate (FS) in primary molar pulpotomies. Methods and Materials This randomized clinical trial was conducted o...

Background and Aim: Midazolam is among routine agents used for inducing safe sedation. This study was designed to compare the sedative effect of oral administration of midazolam (Elixir vs Vial) in fearful children during dental treatment. Materials and Methods: A randomized double blind clinical trial was conducted in a cross over style on 20 you...

Introduction: Factor XIII deficiency is a relatively rare hereditary bleeding disorder, which is usually found during infancy or early childhood. This condition may involve both genders within different races in an equal manner. Its incidence is estimated at approximately 1 in 10⁶ live births. Patients with factor XIII deficiency are presented with...

Objectives Midazolam with variable dosages has been used to induce sedation in pediatric dentistry. The aim of this study was to compare the efficacy of two dosages of oral midazolam for conscious sedation of children undergoing dental treatment. Materials and Methods In this randomized crossover double blind clinical trial, 20 healthy children (A...

Purpose: Clinical experience shows that formation of calculus is a very rare phenomenon in primary teeth, but it increases as the permanent teeth erupt. The purpose of this study was to assess the relationship between dental calculus, dental anatomy, and salivary factors in primary and mixed dentition stages. Methods: A cross-sectional study was ca...

Background and aims. There are several known sedative drugs, with midazolam and ketamine being the most commonly used drugs in children. The aim of this study was to compare the effect of intranasal and oral midazolam plus ketamine in children with high levels of dental anxiety. Materials and methods.A crossover double-blind clinical trial was cond...

Ehlers Danlos Syndrom (EDS) is a very rare entity which drives from poor collagen quality within various parts of the individual. Skin is mostly affected by its high elasticity and joint are easily moved in a wide range out of normal. Tongue is also extended considerably with no rupture or resistance. Suturing any surgical wound will be complicated...

Introduction: This study aimed to elaborate a case with several complications and recommended some suggestions for dental management of these individuals. Case Presentation: Ehlers-Danlos syndrome (EDS) is a relatively rare condition involving a group of patients with inherited connective tissue disorders. Main manifestations of this condition are...

AimThis study was designed to evaluate the apical pulp of open apex teeth following extraction, surface treatment, and preservation in different storage media in dogs.Materials and methodsFour healthy male dogs were included in this prospective animal study. In the first phase of extraction, 30 teeth were extracted atraumatically from dogs (incisor...

Epidermolysis bullosa (EB) is a group of rare inherited skin and mucous membrane disorders in which blister formation may arise spontaneously or following a minor friction. Various patterns of inheritance are explicated for the disease. The disease has a profound effect on oral mucosa and may result in high prevalence of dental caries. General anes...

Aim: This study was aimed to evaluate the effect of steam sterilization on the accuracy (within 10%) of friction-style mechanical torque limiting devices (F-S MTLDs) to achieve their target torque values. Materials and Methods: Fifteen new F-S MTLDs were selected from Astra Tech (25 Ncm, Hader SA, La Chaux-de-Fonds, Switzerland), BioHorizons (30 Nc...

Mechanical torque limiting devices (MTLDs) are necessary tools to control a peak torque and achieving target values of screw component of dental implants. Due to probable effect of autoclaving and number of use on the accuracy of these devices, this study aimed to evaluate the effect of sterilization and number of use on the accuracy of friction-st...

Objective: Different drugs are used for conscious sedation in pediatric dentistry either single or in combination. This study assessed the comparative effect of midazolam/hydroxyzine and chloral hydrate/hydroxyzine on 2–6 year-old uncooperative children needing dental treatment. Materials and Methods: A double blind cross-over randomized clinical...

Objectives: The necessity for using anesthesia in dentistry for disobedient children and medically compromised ones is widely accepted as a path to ultimately deliver dental treatment to them. Based on the limited experience of such conditions in Iran and the fact that it has many unknown points yet to be outlined, this experience was conducted in...

Isolated impacted supernumerary teeth are quite rare, but they can be seen associated with several syndromes such as cleidocranial dysostosis or Gardner’s syndrome. This article aims to discuss a case of sequential formation of supernumerary teeth with no other associated disease or syndrome. A 17-year-old Iranian male with 8 impacted supernumerary...

Structurally defected teeth are not only weak but also provide favorable areas for colonization of bacteria. This subsequently will increase the incidence of dental caries in such dentition. Enamel hypoplaisa is considered one of many caries inducing factors. The aim of this investigation was to evaluate the frequency of dental caries among hypopla...

A prolonged life of fissure sealant has always been the target for preventing caries in vulnerable newly erupted teeth. The use of preparatory techniques including bur introduction to the fissures is considered among such improving steps. Ninety freshly extracted healthy maxillary premolar teeth were randomly selected for this investigation. Teeth...

THE GOAL OF THIS INVESTIGATION WAS TO COMPARE THE BEHAVIORAL AND PHYSIOLOGICAL EFFECTS OF THREE SEDATIVE DRUG REGIMENS: oral meperidine (OM), submucosal meperidine (SM) and oral midazolam (M) in healthy pediatric patients. This study sample consisted of thirty children aged 24-72 months (mean = 41.1) exhibiting definitely negative behavior. Three s...

Objective: The purpose of this study was to investigate a possible relationship between human leukocyte antigens (HLAs) DRB1 and DQB1and early childhood caries in children. Method: the genomic DNAs were extracted from whole blood samples of 30 patients with ECC and 35 caries-free children by the Roche DNA extraction kits. The genomic DNA was am...

Objective: The aim of this study was to evaluate the histological changes at the apical pulp of open apex teeth following extraction, surface treatment and preservation in different storage media prior to replantation in dogs Method: Four healthy male dogs were selected aged 7-9 months (weighing 10 to 15 kg) with 30 incisor and premolar teeth bei...

Objective: The aim of this study was to investigate the antibacterial capability of calcipexII as an irrigant during cleaning and shaping of infected root canals. Method: In this invitro investigation, 60 single-rooted permanent anterior teeth were selected. Crowns of the teeth were cut to obtain a 14 mm length in all samples. Initial ins...

The aim of this investigation was to evaluate the efficacy of a new formulation named "Hajji's spray" for prevention of dental plaque formation in Muslim pilgrims who are banned from tooth brushing during their 1 month of stay in Mecca (period of Ihram in Hajj) due to some religious restrictions. In this randomized, double-blind, crossover clinical...

NovaMin, a synthetic mineral composed of calcium, sodium, phosphorous and silica releases deposits of crystalline hydroxyl-carbonate apatite (HCA) structurally similar to tooth mineral composition. The aim of this investigation was to compare the potential remineralization effect of topical NovaMin and Sodium Fluoride gel on caries like lesions in...

Investigation was designed to evaluate the behavioral changes in children receiving dental treatment while they have been administered combination of Midazolam/Ketamine or Midazolam/Promethazine. This was a randomized double blind clinical trial with cases being selected from those uncooperative children aged 2 to 6 years from those referred for tr...

Objectives: The aim of this study was to evaluate the effect of anterior bite plate on the growth and development of oral cavity in deep bite young patients. Methods: Template include 5 girls and 10 boys the average age of 12.6 ± 0.6 years were selected from private practice after initial evaluation of the study casts, X-rays and photos. Treatmen...

Objectives: Dental students must learn all dental treatment techniques necessitated for public oral health due to their future professional responsibilities. Furthermore, there are limited experiences regarding dental treatments under general anesthesia for the children in the country , so , little is known on the student’s knowledge in this aspe...

Objectives: This study was aimed to look at the efficacy of wet and dry brushing on cleaning outcome of the tooth surface Methods: A total of 43 children aged 10-12 years were randomly selected and instructed to follow the protocol for brushing teeth as instructed. Each case served as control to himself / herself. Patients were requested to brush...

Objectives: The aim of this investigation was to compare the potential remineralization effect of topical NovaMin and Sodium Fluoride gel on caries like lesion in permanent teeth. Methods: A total of 60 sound human freshly extracted teeth were subjected to a PH-cycling protocol. Specimens were randomly assigned to one of the two treatment gro...

Objectives: The use of anesthetic drugs with short duration of action without significant adverse effects is very critical in children. This study has aimed at evaluating the duration of recovery stage and complications of anesthesia with propofol infusion. Methods: In this descriptive cross sectional study, forty five healthy patients, aged 5-10...

Purpose: The purpose was to determine parent's perception towards pediatric dental treatment under general anesthesia in a community in Tehran, Iran. Methods: A questionnaire was handed to 100 parents accompanying their child for treatment in Mofid Children's Hospital, Shahid Beheshti University, Tehran, Iran during 2008-2009. The questionnaire con...

Purpose: The purpose was to determine Child's behavior changes before and during dental treatment when Midazolam/Chloral Hydrate or Midazolam/Promethazine oral combination drugs are administered. Methods: A proforma was filled in for all 30 children aged 2-6 years who were selected from the pool of referred children for general anesthesia in Mofid...

Statement of Problem: Various forms of fluoride-contained products are used to increase the resistance of the tooth against caries for preventive purposes. Furthermore, studies demonstrated higher fluoride uptake with varnish and gel among the wide range of products. Purpose: This study compared fluoride uptake of Duraflor ® varnish (Practicon Dent...

To compare the clinical and radiographic response of primary teeth to vital pulpotomy using mineral trioxide aggregate (MTA) or formocresol (FC). A group of 17 children aged 4-9 were selected from those referred to the Paedodontic Department at Shahid Beheshti University, Dental School. Cases with at least two matching teeth were selected (40 teeth...

Background & Aim: Un-cooperative children with massive dental need are usually suitable candidates for outpatient dental procedures under general anesthesia. Discharge from recovery without complications is an ideal goal achieved by the use of short acting anesthetic agents. This study was designed to evaluate the duration of recovery as well as po...

Purpose: The aim of this investigation was to compare the root surface roughness following scaling by Er:YAG laser with the conventional ultrasonic and hand instruments. Materials and Methods: This in vitro investigation was performed on 15 premolars which had been freshly extracted due to existing periodontal problems. Scaling was performed either...

Objective: Low-level laser therapy (LLLT) has been increasingly in use over the last few decades in both medicine and dentistry. It has been suggested that LLLT may be helpful in pulpal wound healing following pulp exposure. The purpose of this study was to compare the effectiveness of LLLT and formocresol (FC) application in healing of remaining p...

The aim of this study was to compare clinical as well as radiographic status of periodontal tissue of carious or badly restored teeth in comparison to healthy adjacent ones. A group of 50 individuals aged 20-50 years were selected from those referred to periodontics department at Shahid Beheshti Medical University for their periodontal complication...

Background and aims. The use of fluoride mouthrinses has been proved to be one of the most effective ways to prevent tooth decay. A community based program using F+ rinse at school has also proved to be well-controlled and efficient. The aim of this investigation was to evaluate fluoride uptake level of a locally prepared NaF rinse used in Iran’s s...

This study was designed to evaluate clinical and radiographic success rates of Mineral Trioxide Aggregate (MTA) as a relatively new pulpotomy agent for pulp treatment of primary teeth. This prospective investigation was carried out on a group of children with a mean age of 6.4 years who were referred to Shiraz Dental School for routine care. Pulp a...

This research was designed to evaluation the mandibular size and position in a group of 13-15 years old Iranian children with Class II division I malocclusion. A retrospective study was conducted on a series of patient's files including radiographs for mandibular size and position in 923 individuals from Iranian southern community. The pretreatment...

Objective: The aim of the present study was to investigate the level of gingival over- growth (GO) in patients with kidney transplant. Materials and Methods: The target group of the study was the patients recently received kidney transplant and cyclosporine-A therapy. By a systematic case selection method, a total of 131 cases were included in the...

After the third molar, congenitally missing of second premolars has the highest incidence. Endodontic treatment of second primary molars is therefore, of prim importance for a longer lasting tooth. The aim of this article was to look at the potential improvement and longevity of 2nd primary molar root canal therapy using Gutta percha when missing s...