2024-03-29T08:33:29Z
https://jdmt.mums.ac.ir/?_action=export&rf=summon&issue=1665
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
Bone-Borne Maxillary Expansion and Traditional Rapid Maxillary Expansion: A Systematic Review and Meta-Analysis
Amirreza
Mashreghi
Erfan
Bardideh
Hooman
Shafaee
Maliheh
Dadgarmoghaddam
Introduction: The aim of this study was to perform a systematic review and meta-analysis to compare the effect of bone-borne expansion (BBE) and tooth-borne expansion (TBE) in patients with maxillary constriction. Methods: Electronic databases, including MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials, were searched up to February 2019. Eligible clinical trials and cohort studies that studied the effects of bone-borne and tooth-borne expansion appliances on patients with constricted maxilla were selected. The study selection, data extraction, and risk of bias assessment were independently performed by two authors. Then, the random-effects meta-analysis and post-hoc heterogeneity tests were performed. Results: In the end, four studies were included in the present meta-analysis (i.e., a randomized clinical trial, two prospective controlled clinical trials, and a cohort study) that collected data from 117 patients. The mean differences between TBE and BBE were 0.38 mm and -0.28 mm for premolar and molar apices, 0.67 mm and 1.18 mm for premolar and molar crowns, 0.19 mm and 0.17 mm for alveolar bone in premolar and molar areas, and -0.61 mm and 0.02 mm for nasal and maxillary bones, respectively. Moreover, the differences between TBE and BBE for dental angulation were 3.84◦ and 1.52◦ for left and right molars, as well as 4.85◦ and 3.46◦ for left and right premolars, respectively. Conclusion: The BBE appliances do not have any advantages over tooth-borne devices with regard to the amount of skeletal or dental expansion; however, it seems to produce less tipping in posterior teeth.
Palatal Expansion Technique
Orthodontic appliances
Fixed
Orthodontic Anchorage Procedures
2019
10
01
159
168
https://jdmt.mums.ac.ir/article_14114_e123392071836d10aae53eb54a5c623e.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
The Role of Root Canal Preparation on Apical Geometry: A Review of the Literature
Zahed
Mohammadi
Jun-Ichiro
Kinoshita
Atsufumi
Manabe
Mikihiro
Kobayashi
Sousan
Shalavi
Flavio
Palazzi
Hamid
Jafarzadeh
The amounts of apical enlargement have been a controversial issue for a long time. The enlargement of the apical part of the canal may severely impact the endodontic prognosis. Enlargement of the apical portion to a larger size may negatively affect the ability to control the filling material during root canal obturation. In addition, an open-apex increases the risk for overfilling which has been shown to be related with decreased success rate. The retreatment of a tooth with apically enlarged canal may be even impossible. Further preparation of an apically enlarged canal may increase the risk of iatrogenic errors and also excessive apical root weakness. The present article aimed to address in vitro and clinical studies on apical enlargement, effect of coronal pre-flaring on the size of the master apical file, and clinical applications of apical enlargement.
Apical enlargement
coronal enlargement
penetration of bacteria
2019
10
01
169
173
https://jdmt.mums.ac.ir/article_14102_0312869a3ed9029d4b37c5b54f32d0ed.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
Comparing a Combination of Saline and Chlorhexidine with Saline as Root Canal Irrigation Solutions in Pulpectomy of the Primary Molars in 6-9 Years Old Children, A Double Blind Clinical Trial
Mahsa
Sayadizadeh
Raziyeh
Shojaeipour
Masoumeh
Aminizadeh
Azadeh
Horri
Sajad
Raeisi Estabragh
Mohammadjavad
Aminizadeh
Farzane
Jalali
Introduction: Using irrigation solutions in pulpectomy procedures for children is the best technique to dissolve and remove the soft necrotic materials during instrumentation. Normal saline solution (NSS) has no antibacterial activity and only results in root canal cleaning during irrigation. The 2% chlorhexidine gluconate (CHX) solution significantly decreases bacterial colonies, compared to NSS. The present study was performed to evaluate the success of irrigation by NSS and CHX combined solution, in comparison to NSS. Materials and Methods: The current study was conducted on 60 children aged 6‒9 years allocated to the two groups of test and control. All the participants had one primary molar tooth with signs and symptoms of irreversible pulpitis. During pulpectomy of the 30 teeth, the standard technique, consisting of irrigation with 0.9% NSS was used for the control group. The 30 teeth of the remaining subjects in the case group were irrigated with an equal volume of 0.2% CHX and NSS combination. Clinical radiographic follow-ups were scheduled at 6 and 12 month post-operation intervals. Results: The success rates at 12 month follow-up from clinical and radiographic viewpoints in the control group were 83% and 73%, respectively. For the case group, success rates of 97% and 90% were reported clinically and radiographically, respectively. There were no significant diffferences between the case and control groups at 6- (P= 0.492) and 12- (P= 0.195) month clinical follow-ups. On the other hand, the two groups were siginificantly different regarding the 6-month radiographic follow-up (P=0.038); however, such difference was not significant at the 12-month follow-up (P=0.095). Conclusion: Theone-year follow-up showed that there is no diffference between CHX and NSS as irrigation solutions for cleaning the root canals of primary teeth with irreversible pulpitis.
Chlorhexidine gluconate
Normal saline solution
primary molar
Pulpectomy
2019
10
01
174
181
https://jdmt.mums.ac.ir/article_13898_e4f26c5c5fda6d672f5be06680941c77.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
Stress Distribution in Four Restorative Methods in Endodontically Treated Maxillary Premolar: A 3D Finite Element Analysis
Alireza
Daneshkazemi
Mohammad Mehdi
Jalili Bahabad
Rahele
Mirseifinejad
Mohammad Hosein
Amirzade Iranaq
elnaz
karimian
Introduction: the Restoration of endodontically treated teeth is critical, and the Awareness of stresses developed by oblique and vertical forces in restorative methods take a great role in treatment plans. Due to the anatomical shape and inherent form of the stress distribution premolars, could be lost by fractures. Some fractures such as vertical fracture which is probable in endodontically treated teeth, makes the teeth a candidate for extraction and other surgical procedures. According to this fact that the dental restorations should be conservative, the aim of this study was to determine stress distribution using four composite restorative methods. Methods: Endodontically treated maxillary second premolars were restored with composite resin using four methods. For restoration, the models representing standard Mesio-occlusal-distal (MOD) restoration, cusps capping with thickness of 1 and 2mm, and the use of woven fiber in occlusal part, were prepared. The effects of the different restorative approaches on stress distribution were analyzed using three-dimensional finite element stress analysis. Results: the highest stress rate was observed in MOD tooth restoration and the amount of stress in natural parts of the tooth in woven fiber was found the lowest. Conclusion: The simulation results show that in all models, oblique forces caused more stress than vertical forces. Moreover, there was a slight difference between different types of restorations regarding the magnitude of stress; however, the results obtained from this study showed that woven fiber could partly reduce stresses.
Endodontically Treated
Finite element analysis
Restorative dentistry
Resin composites
Woven Fibers
2019
10
01
182
189
https://jdmt.mums.ac.ir/article_14045_f988dc0e4919034f31fd785011acd1a2.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
General Anxiety and Dental Fear: Is There A Relationship?
Fahimeh
Anbari
Zahra
Elmi
Farima
Anbari
Kosar
Rezaeifar
Introduction: Anxiety is an emotional state that helps healthy people defend themselves against threats. Dental anxiety is referred to a patient's specific response to stressful dental practices. The prevalence of dental anxiety is estimated to be between 3-43%. The relation between dental caries and dental anxiety is well understood, which happen as the result of patient’s avoidance of dental visits. We aimed to measure dental fear in patients and evaluate its relationship with general anxiety. Methods: This cross-sectional study was performed on 90 patients referred to Oral medicine Department of Rasht Dental School in winter 2016. The severity of dental fear was measured by DFS Questionnaire and the level of general anxiety was measured by Cattell’s anxiety scale. Pearson’s correlation coefficient, t-test, and ANOVA were used for data analysis. Results: Total anxiety in 81 (90%) of the subjects was higher than the average. The mean total score of anxiety was 5.74 (SD=1.82). Sixty one (67.8%) of the patients had significantly higher anxiety than average and anxiety level in 70 (77.8%) of them was more than moderate. Pearson’s correlation coefficient showed that there was a positive and significant relationship between general anxiety and dental anxiety (P<0.01, R=0.262). Independent t-test showed that the mean score of dental anxiety in males (M=33.82, SD=14.96) was significantly less than females (F=40.09) (P=0.048). Conclusion: According to the results of this research, there is a significant correlation between dental anxiety and general anxiety and also between dental anxiety and gender.
dental fear
Dental anxiety
general anxiety
Trait anxiety
State anxiety
2019
10
01
190
196
https://jdmt.mums.ac.ir/article_14019_ef13b7ad11168b000f18a27983e13480.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
Evaluation of the Effect of Household Cleansers on the Color Change of Two Types of Permanent Soft Liners: An In Vitro Study
Ehsan
Jafari
Davoud
Nodehi
Fatemeh
Fallah
Many patients use household cleaners to clean denture which can cause discoloration and damage soft liners. The purpose of this study was to evaluate the effect of household cleansers on the color change of two types of permanent soft liners. Methods: In this interventional study, 80 permanent silicone soft liners, including 40 heat-cured liners (Molloplast-B, Detax Gmbh & Co. KG, Ettlingen, Germany) and 40 self-cure liners (Mucopren soft, Kettenbach GmbH & Co. KG, Eschenburg, Germany) were made in brass molds with dimensions of 15×2 mm in accordance with the manufacturer's instructions. The samples were immersed in distilled water for 24h and the initial color was determined using a colorimeter. Then, each group (n=10) was immersed for 8h daily in 2.5% vinegar, 2.5% hypochlorite, 2.5% hand washing liquid, and distilled water (control). Color measurements were performed after 7 and 30 days of immersion in solutions and data were analyzed using ANOVA, independent t-test, and Tukey's post hoc tests. Results: In distilled water, hypochlorite, and vinegar, the mean color change after one month was significantly lower in Molloplast-B than Mucopren (P=0.042, P<0.001, P=0.002); however, in Hand washing, the difference was not significant (P=0.780). Conclusion: The mean color change in Mucopren in all cleansers was higher than Molloplast-B, and the highest change in color was observed in both liners in hypochlorite.
Soft liner material
Color change
Household cleansers
2019
10
01
197
204
https://jdmt.mums.ac.ir/article_14112_b488c2af9fb503b67bfabfc32d315c85.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
Evaluation of the Effect of an Experimental Herbal versus Fluoridated Mouthwash on Frictional Resistance and Surface Roughness between Orthodontic Brackets and Two Types of Archwire: In Vitro Study
Naser Abdelgader
Alwafe
Shaza Mohammad
Hammad
Noha
AbdelMawla El-wassefy
Ahmad Mohammed
Hafez
Introduction: The present study aimed to evaluate an experimental herbal mouthwash, as compared to sodium fluoride mouthwash on the frictional resistance and surface roughness between brackets and two rectangular archwire types. Methods: A total of 60 premolar׳s brackets engaged with 0.019×0.025 archwires made of stainless steel and nickel-titanium alloys were used in this study. The samples were assigned into three groups, each group contained ten stainless steel archwires-brackets and ten nickel titanium archwires-brackets combination. Thereafter, these samples were immersed in herbal mouthwash, sodium fluoride mouthwash (study groups) and artificial saliva (control group) for 90 minutes. Universal testing machine was used to test the friction resistance in the three groups. Atomic force and scanning electron microscopes were used to evaluate the surface roughness of wires and bracket surface topography, respectively. Results: The samples immersed in sodium fluoride mouthwash illustrated the highest mean friction resistance and mean surface roughness, followed by herbal mouthwash and the least was for artificial saliva. Conclusion: The 90-minute immersion in herbal mouthwash did not exert any significant effect on frictional resistance or surface roughness among orthodontic brackets and archwires made of stainless steel and nickel titanium. Based on the results, herbal mouthwash may be prescribed as a non-destructive prophylactic agent on materials evaluated in the present study for the orthodontic patient.
Mouthwashes
Friction
surface roughness
Stainless steel
Nickel titanium
2019
10
01
205
214
https://jdmt.mums.ac.ir/article_14143_bb28ed3c85b4196a185a4053fba016df.pdf
Journal of Dental Materials and Techniques
JDMT
2322-4150
2322-4150
2019
8
4
Corrosion of Ni-Ti Rotary Instruments: A Review
Zahed
Mohammadi
Jun-Ichiro
Kinoshita
Atsufumi
Manabe
Mikihiro
Kobayashi
Sousan
Shalavi
Hamid
Jafarzadeh
The nickel-titanium (Ni-Ti) alloys used in endodontics contain 56% Ni and 44% Ti. The 2 unique features related to clinical dentistry (i.e., shape memory effect and superelasticity) are due to the transition from austenite to martensite in Ni-Ti alloy. When a superelastic Ni-Ti alloy undergoes a low tensile loading, normal elastic behavior occurs. In fact, at higher tensile loads, the elastic stress may reach a level at which there is extended horizontal region of elastic strain. The shape-memory property of Ni-Ti is derived from an atomic arrangement different from that of alloys like stainless steel. The purpose of this paper was to review the unique features of this alloy and mechanism of corrosion.
Corrosion
Endodontics
Ni-Ti
Root canal preparation
Rotary Instrument
2019
10
01
215
219
https://jdmt.mums.ac.ir/article_14144_8e7ec64bc207962a245c338950e905f1.pdf