2024-03-29T19:12:57Z
https://jdmt.mums.ac.ir/?_action=export&rf=summon&issue=55
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2013
2
1
Spatial Relationship between Mandibular Third Molars and Inferior Alveolar Nerve using a Volume Rendering Software
Ali
Bagherpour
Maryam
Mohammadzadeh Rezaei
Shahrokh
Nasseri
Precise localization of the third molars in relation to the inferior alveolar nerve canal is critical from a clinical point of view and strongly affects the surgical treatment outcome. Recently, by using three-dimensional modeling software, the relationship of third molar root apices and inferior alveolar nerve canal can be better understood. In this study, the spatial relationship of two surgical sites of 19 impacted third molars with close relationship to the inferior alveolar nerve canal is described by using imaging data from a cone beam computed tomography system. This study aimed to investigate the ability of three-dimensional modeling of tooth-nerve relationship using the data imported to Amira 5.2.2 imaging software
Cone beam computed tomography
Inferior Alveolar Nerve
mandibular third molar
volume rendering
2013
03
01
1
5
https://jdmt.mums.ac.ir/article_140_ce45a6e179fa2e5b0ad5825b267d1a60.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2013
2
1
Effect of Chlorhexidine Application on Bond Durability of a
Filled-Adhesive System
Alireza
Boruziniat
Morteza
Babazadeh
Mahshid
Gifani
The aim of this study was to evaluate the effect of chlorhexidine (CHX) application on immediate and two-month bond strength of a filled adhesive system. Methods: Forty eight non-carious human third molars without enamel of occlusal surface were randomly divided into two main groups according to CHX application: control and CHX. Each main group was further subdivided into 2 subgroups depending on storage time: immediate or two-month collagenase storage. In CHX groups, 2% CHX was applied for 30 s. Filled adhesive resin (PQ1) was applied on the etched dentin surfaces and cured in all experimental groups. Composite resin (Amelogen) was placed on the dentin surfaces and shear bond strength (SBS) was evaluated immediately and after two-month storage in collagenase solution. Failure modes were determined by stereomicroscope. Results: There was no significant difference in immediate SBS between groups (P>0.05). After two-month collagenase storage, although SBS was significantly reduced in control group (P<0.05), no significant reduction was observed in CHX group (P>0.05). SBS in CHX group was significantly higher than the control group (P<0.05). Conclusion: The use of CHX had no adverse effect on immediate bond strength of filled adhesive and could preserve the bond strength.
Bond durability
Chlorhexidine
collagenase
filled adhesive
2013
03
01
6
10
https://jdmt.mums.ac.ir/article_143_3abed6f8333819b6ff8bfeca2d2ad0fd.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2013
2
1
Evaluation of the Occlusion and Arch Dimensions in the Primary Dentition of an Iranian Population
Maryam
Talebi
Behjatolmoluk
Ajami
Rasoul
Sahebalam
Introduction: The objective of this study was to gather information about normal occlusion and arch dimensions in the primary teeth of the children belonging to an Iranian population. Methods: This descriptive cross-sectional study was performed on 68 children from the city of Mashhad in the 3-5 age range. Dental arch dimensions, interrelationships of primary canine and second molars, overbite and overjet were evaluated. Results: Primate space was observed on both sides of the arch in 82.2% of the subjects. The most prevalent type of primary molar relationship was flush terminal plane (52.1%) followed by distal step (31.3%) and then mesial step (16.7%). The primary canine relationship was ranked in the descending order of prevalence as Class I (77.1%), Class II (13.5%), end-to-end (5.2%) and Class III (4.2%). Normal overbite and normal overjet was observed in 50% and 81.3% of cases, respectively. Conclusion: This study provides an insight into the dental arch dimensions, occlusion, spacing and crowding in primary dentition in Iranian children. In most of the cases, primate space and flush terminal plane were observed.
Arch dimensions
occlusion
Primary dentition
2013
03
01
11
16
https://jdmt.mums.ac.ir/article_145_230d118ab92c41920a09b8c225233df4.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2013
2
1
Hemodynamic Effect of 2% Lidocaine with 1:80,000 Epinephrine Infiltration in Maxillofacial Surgeries under General Anesthesia
Baratollah
Shaban
Elham
Moradi
Amir Hossein
Nejat
Somayeh
Sabzali Zanjanhkhah
Touraj
Vaezi
Introduction: Epinephrine-containing lidocaine is the most used anestheic drug in dentistry. The aim of this study was to investigate the hemodynamic changes following local infiltration of 2%lidocaine with 1:80,000 epinephrine in subjects undergoing orthognatic surgery under general anesthesia. Methods: Twenty five patients without any systemic disease participated. After general anesthesia, two cartridges of 2% lidocaine + 1:80,000 epinephrine were infiltrated around the surgery site. Systolic (SBP) and diastolic (DBP) blood pressure, mean arterial blood pressure (MAP), heart rate (HR), and blood sugar (BS) were measured in three stages: before the injection (M1), at the end of injection (M2), and 10 min after injection (M3). Results: No significant difference observed in SBP, DBP, and MAP at the end of injection and 10 min later. HR was increased significantly after injection and remained significantly higher than baseline after 10 min. BS increased slightly at the end of injection and continued to increase after 10 min. However, changes in BS were not significant. Conclusion: Using two cartridges of epinephrine-containing lidocaine have slight systemic changes in healthy subjects; as a result, this dosage could be used in patients with cardiovascular complications undergoing general anesthesia.
blood pressure
epinephrine
Heart rate
Lidocaine
local anesthesia
2013
03
01
17
20
https://jdmt.mums.ac.ir/article_147_ae0fbd97cceec354d712aa5e7c082686.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2013
2
1
Microleakage under Orthodontic Metal Brackets Bonded with Three Different Bonding Techniques with/without Thermocycling
Berahman
Sabzevari
Barat Ali
Ramazanzadeh
Saied Mostafa
Moazzami
Armin
Sharifi
Introduction: The aim of this study was to compare the microleakage of beneath the orthodontic brackets bonded with 3 different bonding techniques and evaluate the effect of thermocycling. Methods: One hundred and twenty premolars were randomly divided into 6 groups, received the following treatment: group 1: 37% phosphoric acid gel+Unite primer+Unite adhesive, group 2: 37% phosphoric acid gel+ Transbond XT primer+Transbond XT adhesive, group 3: Transbond plus Self Etching Primer (TSEP)+Transbond XT adhesive. Groups 4, 5, and 6 were similar to groups 1, 2, and 3, respectively. Evaluation of microleakage was done following to thermocycling test. After bonding, the specimens were sealed with nail varnish except for 1 mm around the brackets and then stained with 0.5% basic fuchsine. The specimens were sectioned at buccolingual direction in 2 parallel planes and evaluated under a stereomicroscope to determine the amount of microleakage at bracket-adhesive and adhesive-enamel interfaces from gingival and occlusal margins. Results: Microleakage was observed in all groups, and increased significantly after thermocycling at some interfaces of Unite adhesive group and conventional etching+Transbond XT adhesive group, but the increase was not significant in any interface of TSEP group. With or without thermocycling, TSEP displayed more microleakage than other groups. In most groups, microleakage at gingival margin was significantly higher than occlusal margin. Conclusion: Thermocycling and type of bonding technique significantly affect the amount of microleakage.
Adhesive
Microleakage
orthodontic bracket
thermocycling
2013
03
01
21
28
https://jdmt.mums.ac.ir/article_151_49a3e99d96e7596f3caf8a5b43db4f51.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2013
2
1
The Effect of Full Crown Preparation on Normal and Inflamed Pulp Tissue: An Animal Study
Maryam
Bidar
Azam Sadat
Madani
Nooshin
Mohtasham
Mandana
Vardkar
Hamid
Jafarzadeh
Introduction: Full crown preparation may have adverse effects on pulp tissue. In this study, the effect of full-crown preparation on intact versus inflamed pulp tissue was studied. Methods: Fifteen healthy mature cats were randomly selected for this study. The study was performed on four canine teeth of each cat. Cats were anesthetized and then radiographs were taken from the canine teeth. Class V cavities were prepared in cat canine teeth. Soft decayed dentin was placed on the floor of cavities and sealed. After 1 month, all of the samples prepared for crown fabrication. Before crown preparation, an impression was taken in a custom tray. During crown preparation, the remnants of carious dentin were removed and undercuts were sealed by glass-ionomer. After preparation, self-cured acrylic temporary crowns were fabricated in a direct procedure and cemented permanently by glass-ionomer. One week later, teeth of the opposite jaw were prepared in a similar procedure. After 2 months, vital perfusion performed and the pulp tissue was histologically examined. Results: There was no significant difference between 4 groups, regarding to histologic status of the pulp. In healthy lower jaw, inflammation was the most frequent but in the other groups, necrosis was most frequent. Also, there was no significant difference between the upper jaw and the lower jaw groups regarding to the frequency of necrosis and inflammation. Conclusion: There is no significant difference between intact and inflamed groups regarding the frequency of necrosis and inflammation
Animal study
chronic inflammation
crown preparation
2013
03
01
29
33
https://jdmt.mums.ac.ir/article_160_28be33a0f6ee7b6520c346258f05ce61.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2013
2
1
Malignant Peripheral Nerve Sheath Tumor in the Maxilla: Report of a Rare Case
Jahanshah
Salehinejad
Atefeh
Nasseh
Amir Hossein
Jafarian
Nazanin
Bashardoust
Malignant peripheral nerve sheath tumor (MPNST) is a rare malignant tumor that develops either from a preexisting neurofibroma or de novo. The cell of origin is believed to be the Schwann cell and possibly other nerve sheath cells. In this report, we describe a rare case of MPNST that arise from the socket of second left maxillary molar that has been already extracted in a young man. He was referred to a dentist’s office with a tumor-like mass of soft tissue on his left maxillary gingiva. Biopsy and histopathologic examination was performed and based on histologic and immuno-histochemical findings, the diagnosis of MPNST was made. MPNST is a rare malignant tumor in the oral cavity. Dentists must be careful and conscious because this rare malignancy can occur in gingiva and can mimic the clinical feature of any benign gingival enlargements.
Malignant peripheral nerve sheath tumor
maxilla
Neurofibroma
2013
03
01
34
37
https://jdmt.mums.ac.ir/article_162_da7c6d46d64f56c0c0be55919d7cadcb.pdf