Dental Research Journal
Volume:12 Issue: 5, Sep 2015

Glutathione, considered to be the master antioxidant (AO), is the most-important redox regulator that controls in Therapeutic considerations for the adjunctive use of glutathione in management of periodontitis, in limiting the tissue damage associated with oxidative stress, and enhancing wound healing cannot beunderestimated, but need to be evaluated further through multi-centered randomized controlled trials.flammatory processes, and thus damage to the periodontium. Periodontitis patients have reduced total AO capacity in whole saliva, and lower concentrations of reduced glutathione (GSH) in serum and gingival crevicular fluid, and periodontal therapy restores the redox balance.

Vital pulp therapy (VPT) is a biologic and conservative treatment modality to preserve the vitality and function of the coronal or remaining radicular pulp tissue in vital permanent teeth.A search was conducted via the Cochrane database, PubMed, MEDLINE, and Ovid for any articles with the criteria for “pulp-capping,” or “pulp-capping materials” and “VPT outcomes” from 1978 to mid 2014. All articles were evaluated and the valid papers were selected. The outcomes of various VPT techniques, including indirect pulp treatment, direct pulp treatment, partial pulpotomy, and complete pulpotomy in vital permanent teeth were extracted. Although various studies have different research approach, most studies noted a favorable treatment outcome. Mineral trioxide aggregate (MTA) appears to be more effective than calciumhydroxide (Ca(OH) However, it seems that the success rate for partial pulpotomy and pulpotomy with Ca(OH) 2) for maintaining long-term pulp vitality after indirect and direct pulpcapping.2 is similar to MTA.

Various materials and techniques have been developed to facilitate bone healing process and reduce its healing period. In recent studies, it is pointed out that, platelet rich fi brin (PRF) which is derived autogenously from the own blood of the individuals, increase regeneration and accelerate the healing of the wound, due to the consisting various growing factors. The aim of the experimental study is to evaluate the effi ciency of PRF and PRF/autogenous graft combination on bone healing in different time intervals. A total of 24 skeletally mature New Zealand rabbits were used.Animals were divided randomly into two groups. Two bone defects with a diameter 3, 3 mm were created on the right and left tibia in all group animals. Only particulate autogeneous bone graft, only PRF, combination of PRF and autogeneous bone graft and empty bone cavity, were performed to all animals. The animals in the fi rst experimental group were sacrifi ced after 30 days. The animals in the second experimental group were sacrifi ced after 60 days from the operation. Histomorphometrical and statistical analysis was performed. The data were analyzed using Tukey test (P < 0. for osteoblast number, P < 0.01 for osteoclast and new bone area values). Histomorphometrical analyzes showed that either PRF used alone or used in conjuction with autogenous bone graft, PRF accelerated the healing of the bone defects. There were statistically signifi cant differences in osteoblast, osteoblast and new bone area values in PRF alone and autogenous graft with PRF than the other groups. Our preliminary result demonstrated that PRF increase new bone formation and has a positive effect on early bone healing.

The aim of this study was to assess the infl uence of temperature on the viscosity of different endodontic irrigants. The measurements of viscosity of 3% hydrogen peroxide, 0.9% sodium chloride, aqueous solution of 0.2% chlorhexidine (CHX) and 0.2% cetrimide, 5% sodium hypochlorite (NaOCl) and 17% ethylenediaminetetraacetic acid (EDTA) at different temperatures (22 C, 30°C, 40°C, 50°C and 60°C) were obtained using Mohr balance and Ostwald viscometer. The Shapiro- Wilk test and Mann-Whitney U-tests were used for the statistical analysis. (α = 0.05). No signifi cant differences were recorded at each temperature among 3% hydrogen peroxide, 0.9% sodium chloride and aqueous solution of 0.2% CHX and 0.2% cetrimide. 5% NaOCl and 17% EDTA showed the higher values. Viscosity statistically decreased with increasing temperature. Within the limitations of this study, 5% NaOCl and 17% EDTA are signifi cantly viscous at room temperature and their viscosity reduces with elevating temperature.

Accurate impression making is an essential prerequisite for achieving a passive fi t between the implant and the superstructure. The aim of this in vitro study was to compare the three-dimensional accuracy of open-tray and three closed-tray impression techniques. Three acrylic resin mandibular master models with four parallel implants were used: Biohorizons (BIO), Straumann tissue-level (STL), and Straumann bone-level (SBL). Forty-two putty/wash polyvinyl siloxane impressions of the models were made using open tray and closed-tray techniques. Closed-tray impressions were made using snap-on (STL model), transfer coping (TC) (BIO model) and TC plus plastic cap (TC-Cap) (SBL model). The impressions were poured with type IV stone, and the positional accuracy of the implant analog heads in each dimension (x, y and z axes), and the linear displacement (ΔR) were evaluated using a coordinate measuring machine. Data were analyzed using ANOVA and post-hoc Tukey tests (α = 0.05). The ΔR values of the snap-on technique were signifi cantly lower than those of TC and TC-Cap techniques (P < 0.001). No signifi cant differences were found between closed and open impression techniques for STL in Δx, Δy, Δz and ΔR values (P = 0.444, P = 0.181, P = 0.835 and P = 0.911, respectively). Considering the limitations of this study, the snap-on implant-level impression technique resulted in more three-dimensional accuracy than TC and TC-Cap, but it was similar to the open-tray technique.

One of the methods used for joining metals together is welding, which can be carried out using different techniques such as electric spot welding. This study evaluated the effect of electric spot welding on the load defl ection rate of stainless steel and chromium-cobalt orthodontic wires. In this experimental-laboratory study, load defl ection rate of 0.016 × 0.022 inch stainless steel and chromium cobalt wires were evaluated in fi ve groups (n 18): group one: Stainless steel wires, group two: chromium-cobalt wires, group three: stainless steel wires welded to stainless steel wires, group four: Stainless steel wires welded to chromium cobalt wires, group fi ve: chromium-cobalt wire welded to chromium-cobalt wires. Afterward, the forces induced by the samples in 0.5 mm, 1 mm, 1.5 mm defl ection were measured using a universal testing machine. Then mean force measured for each group was compared with other groups. The data were analyzed using repeated measure analysis of variance (ANOVA), one-way ANOVA, and paired t-test by the SPSS software. The signifi cance level was set as 0.05. The Tukey test showed that there were signifi cant differences between the load defl ection rates of welded groups compared to control ones (P < 0.001). Considering the limitation of this study, the electric spot welding process performed on stainless steel and chromium-cobalt wires increased their load defl ection rates.

Correlation between chronological age at different stages of cervical vertebral maturation (CVM) is important in clinical orthodontic practice. The objective of this study was to evaluate the correlation between CVM stage and chronological age in a group of Iranian female patients. This study was conducted on 196 digital lateral cephalometry of female patients with the age ranged 9-14 years. The CVM stage was determined with two calibrated examiners, using the method developed by Baccetti and its correlation with mean chronological age was assessed by the Spearman rank-order. The intra and inter agreements were evaluated by weighted Kappa statistics in overall diagnosis of stages, in addition to determination of presence or absent of concavities at the lower border of second, third and fourth cervical vertebrae and the shapes of the third and fourth vertebrae. P < 0.05 was considered as signifi cant. The correlation coeffi cient between CVM stages and chronological age was relatively low (r = 0.62). The least amount of inter-observer agreement was determined to be at the clinical decision of the shape of the fourth vertebra. Regarding the low reported correlation, the concomitant usage of other skeletal indicators seems necessary for precise determination of physiological age of the patients.

Type 2 diabetes mellitus (T2DM) and periodontitis are infl ammatory conditions with a bidirectional association. This pilot study aimed to evaluate whether T2DM and glycemic control interfere in infl ammatory markers profi les in gingival crevicular fl uid (GCF) in periodontitis patients.

Fourteen diabetic periodontitis patients were enrolled in this study, seven with adequate glycemic control (glycated hemoglobin [HbA1c] <8.0%) (DMA + P) and seven with inadequate control (HbA1c ≥8.0%) (DMI + P). Seven chronic periodontitis patients without diabetes formed the control group (P). GCF was obtained from diseased sites (probing depth >6 mm) of an entirely hemiarch, pooled and cytokines levels determined using multiplex beads immunoassay. Clinical periodontal parameters were analyzed by Mann-Whitney test and levels of cytokines by Kruskal-Wallis and Dunn’s multiple comparison tests with confi dence level of 95% (P < 0.05).

Cytokines profi le of GCF obtained from deep periodontal pockets presented high levels of infl ammatory cytokines, and there were no statistical differences between levels of interleukin-6 (IL-6), IL-8 and tumor necrosis factor-α according to presence of diabetes or percentage of HbA1c among the groups, despite groups with T2DM and periodontitis exhibit higher levels of PD.

Within the limitations of this study, infl ammatory mediators in GCF are dependent to the local response and do not correlate with the diabetic status.

Aphthous lesions are one of the most common diseases of the oral cavity. They can cause severe pain, and there is no defi nite treatment. The purpose of this study was to determine the effi cacy of Zataria multifl ora (ZM, a thyme-like plant) essential oil for the control and treatment of aphthous lesions. This Triple blind clinical trial study was performed on 28 patients who were divided into two groups (eight men and six women in each group) and given ZM or placebo (control). The healing time, pain intensity, and aphthous zone diameter were recorded for each patient and followed for 6-month. Data were analyzed using Mann–Whitney and Friedman tests (P < 0.05). After 6-month of follow-up, 4 patients in the placebo group and 6 patients in the ZM group suffered from recurrent aphthous lesions. The average complete healing time and duration of burning sensation were signifi cantly lower in the ZM group (P < 0.05). Signifi cant difference was observed between the two groups with regard to the diameter of lesions and halo of the lesions (P < 0.05). Within the limitations of this study, ZM shortened the healing period compared to placebo.

Use of smokeless tobacco in the form of moist snuff placed in the oral cavity is popular in rural India. The aim of the present cross-sectional study was to determine the effect of snuff on periodontitis by assessing interleukin (IL)-1 β and IL-8 levels in gingival crevicular fl uid. A total of 60 subjects were selected for this study. 40 subjects presented with periodontitis, which included 20 snuff users (SP) and 20 nonsnuff users (NS). 20 periodontally healthy patients formed the controls (healthy control: HC). The clinical parameters recorded were gingival index (GI), plaque index, calculus index, bleeding on probing (BOP), probing depth (PD), recession (RC), and clinical attachment level (CAL). The IL-1 β and IL-8 levels were assessed through enzyme-linked immunosorbent assay (Quantikine®). Analysis of variance (ANOVA), post hoc Tukey’s, Kruskal-Walli’s ANOVA and Mann-Whitney test was used for comparison among groups and P > 0.05 was considered statistically signifi cant. No signifi cant difference was seen in levels of IL-1 β and IL-8 between SP and NS groups (P = 0.16, 0.97). However, both the periodontitis groups (SP and NS) had increased IL β levels when compared to HC group (P = 0.01, 0.001). The snuff users showed signifi cant increase in GI, BOP, RC, and CAL when compared with NS (P = 0.002, 0.001, 0.012, 0.002) whereas NS group had signifi cant increase in PD (P = 0.003). Within the limitations of this study, use of snuff does not affect the host infl ammatory response associated with periodontitis and leads to RC and increased CAL due to local irritant effect.

Coronally advanced fl ap (CAF) has been shown to effectively treat gingival recession. Platelet rich plasma (PRP), containing autologous growth factors, has been shown to promote soft tissue healing. The aim of this clinical study was to determine whether the addition of an autologous PRP to a CAF when compared to a CAF alone would improve the clinical outcome for treatment of multiple gingival recessions.

Thirty patients with Miller’s class I and class II buccal recession defect were randomly assigned to control (CAF alone) or test (CAF with PRP) groups. Recession depth (RD), recession width (RW), probing depth (PD), clinical attachment level (CAL), width of keratinized tissue, wound healing index, percentage of root coverage was assessed. Patients were followed at 2, 4, 12 and 16 weeks post-surgery. Statistical analysis for intra and inter group comparisons was done using Wilcoxon sign rank and Wilcoxon rank sum tests respectively. P < 0.05 denoted statistical signifi cance.

The differences between the test and control groups were not signifi cant with respect to all the clinical variables. The RD at 16 weeks was signifi cantly reduced from 2.88 ± 0.69 to 0.76 ± 0.24 mm in control group (P < 0.05) and from 2.95 ± 0.43 to 0.76 ± 0.35 mm in the test group (P < 0.05). The mean percentage of root coverage was 73.1 ± 7.3 in the control group and 75.0 ± 8.3 in test group (P < 0.05). The CAL gain was 3.17 ± 0.84 mm within the control group and 3.17 ± 0.79 mm within test group.

Within the limitations of this study, PRP with CAF can provide an early healing of soft tissues, but does not provide clinically measurable improvement in the fi nal therapeutics outcome in CAF.

Oral diseases are common chronic diseases that are affected by human health behavior. One-way to promote health behaviors can be achieved through education. The present study aims to assess the effect of an oral health education program using motivational interviewing (MI) method on oral health status of preschool children. This study recruited 222 volunteer children and their parents from 10 elementary schools into a community trial. At baseline, plaque, gingival and decayed, missing, and fi lled teeth indexes were measured in the children. They were randomly allocated into test groups where they and their parents received oral health education using MI and the control group received traditional oral health education. The test group had recall and postal reminder during 6 months of the study, but there was no reminder for the control group. After 6 months, the same oral health indexes were measured. Data were analyzed using SPSS version 20 (SPSS Inc., Chicago, IL, USA) by t-test, Mann-Whitney and Wilcoxon signed ranks test. P < 0.05 was considered as signifi cant. The results showed that after both oral health education programs, differences of plaque index (PI) (P = 0.000) and gingival index (P = 0.000) were signifi cant between the two groups. The number of children with healthy gingiva and low PI were more frequent in the test group after intervention. Considering the limitations of this study, oral health status of children after education of parents using MI was observed, and it should be considered in oral health education programs.

Antidepressant drugs such as fl uoxetine are of the most commonly used drugs among the public. These drugs may impact the regulation of bone cell functioning, and thus affect orthodontic tooth movement. The aim of this study was to determine the effect of fl uoxetine on tooth movements during orthodontic treatment in rats. In this study, 30 male rats were randomly assigned into two groups and injected with fl uoxetine 10 mg/kg (experimental group) and normal saline (control group) for a period of 1-month intraperitoneally 5 times/week. Then, the rats were anesthetized and a nickeltitanium closed-coil spring was placed between the left maxillary fi rst molar and left maxillary central incisors of all samples, and then fl uoxetine (experimental group) and normal saline (control group) were injected for another 3 weeks by the same method. After measuring tooth movements, rats were sacrifi ced, and histomorphometric analyses were conducted and the obtained data were statistically analyzed using independent t-test and the signifi cance was set at 0.05. Following the fl uoxetine injection, the mean amount of tooth movements in the experimental group was reduced compared to the control group, which was not statistically signifi cant (P = 0.14). There was no signifi cant difference between the two groups regarding bone apposition rate (P = 0.83), external root resorption rate (P = 0.1), and mean number of root resorption lacunae (P = 0.16). Within the limitations of this study, systemic use of fl uoxetine may cause insignifi cant reduction of tooth movement rate in rats; however, this subject needs more evaluations.

Resorption of tooth structures can occur as a result of physiological, pathological, and idiopathic factors. Early diagnosis and appropriate treatment can prevent its serious complications. This case report presents surgical endodontic management of a trauma-induced perforating external root resorption, which was diagnosed with the help of cone beam computed tomography. Following root canal treatment, intentional replantation of the tooth was performed so as to expose the opening of the resorption defect to allow for complete debridement and closure. Eighteen months follow-up showed arrest of root resorption, and progressive healing of the defect.

Sialolithiasis is a common disease of the major salivary glands، characterized by the obstruction of a salivary gland or its excretory duct due to the formation of calcareous concretions. Sialoliths usually measure from 1 mm to <10 mm. They rarely measure more than 15 mm، and infrequently giant salivary gland calculi >15 mm have been reported in the literature. The submandibular gland and its duct appear to be the most susceptible sites for this disease. In this article، we report two unique cases، including a giant bilateral case، measuring 50 mm in length and 5 mm in width on the right side and one، 30 mm in length، and 5 mm in width on the left side; and another case، measuring 83 mm in length. The diagnostic and therapeutic approaches consisted of transocclusal radiography with the conservative transoral surgical technique in both cases. The follow-up showed the normal function of the relevant salivary glands. To the best of our knowledge and belief، similar cases have not been reported in the literature.