scholarly journals Fear of the Relapse: Effect of Composite Type on Adhesion Efficacy of Upper and Lower Orthodontic Fixed Retainers: In Vitro Investigation and Randomized Clinical Trial

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 963 ◽  
Author(s):  
Andrea Scribante ◽  
Simone Gallo ◽  
Benedetta Turcato ◽  
Federico Trovati ◽  
Paola Gandini ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Testing Machine ◽  
Lower Survival Rate ◽  
Adhesive Remnant Index ◽  
In Vitro Investigation ◽  
Round Section ◽  
Lingual Retainer ◽  
Orthodontic Retainers

The aim of this laboratory and clinical study is to determine the reliability of the flowable nanocomposite Filtek Supreme XTE (FL) for the adhesion of orthodontic retainers, compared to highly filled orthodontic resin Transbond XT (XT). Portions of a round section multistranded wire (Ortosmail Krugg) were bonded to 40 bovine incisors with Scotchbond Universal in total-etch modality. For group one (XT, 20 samples), the orthodontic resin was used, whereas in group two (FL, 20 samples), the flowable one. Specimens were placed into a universal testing machine which applied a shear force on retainers with a crosshead speed of one/minute. Shear bond strength (SBS) and adhesive remnant index (ARI) scores were calculated. In the clinical trial, 100 patients requiring a canine-to-canine palatal and lingual retainer were randomly divided into two groups, according to the resin used for bonding procedure: the orthodontic in group one (XT, 50 participants) and the flowable in group two (FL, 50 participants). Monthly visits were carried out over a 24-month follow up to assess any detachment occurring on teeth of both arches. All data were submitted to statistical analysis. In vitro, FL reported a significant lower mean SBS, whereas no significant differences in ARI were reported between the two groups which both showed a major frequency of scores “1” and “2”. At the end of the 24-month follow up, FL reported significantly higher failure rates in both arches besides a significantly lower survival rate starting from the sixth month after retainers bonding. According to the results assessed in vitro and clinically, XT would be preferable to FL when performing retainers bonding procedure.

Evaluation of physical and adhesive properties of enamel after a therapeutic dose of radiation and bonding of orthodontic metal brackets: an in vitro study

2020 ◽  
pp. 1-5
Author(s):  
A. Anushree ◽  
Ashutosh Shetty ◽  
Crystal Runa Soans ◽  
M. N. Kuttappa ◽  
Akhil Shetty ◽  
...  
Keyword(s):  
Testing Machine ◽  
In Vitro Study ◽  
Tooth Surface ◽  
Control Group ◽  
Adhesive Properties ◽  
Adhesive Resin ◽  
Adhesive Remnant Index ◽  
Group 3 ◽  
Group 2

Abstract Aim: The study aimed to evaluate the shear bond strength (SBS) of metal brackets and adhesive properties of bonded irradiated and non-irradiated teeth. Methods: Sixty-six extracted premolar samples were randomly divided into three groups—(a) Control group consisting of 22 non-irradiated, non-aged teeth (Group 1), (b) 22 non-irradiated, aged samples (Group 2) and (c) 22 irradiated, aged samples (Group 3). Irradiation was done using gamma irradiation with a fractionated dose of 60 Gy for 5 consecutive days per week over 6 weeks. Metal brackets were bonded on all samples with light cure adhesive and subjected to SBS test using universal testing machine. The samples were assessed under the scanning electron microscope to check for the adhesive remnant index (ARI) and tag depth. Results: There was a statistically significant decrease in the mean SBS of the irradiated samples compared to the non-irradiated teeth. The non-irradiated, aged samples showed a majority of ARI scoring 1 and 2. Whereas, the irradiated samples showed ARI scoring 2 and 3. Approximately, 77·3% of the non-irradiated samples showed no adhesive present on the tooth surface, and 27·2% of the irradiated samples had more than 50% adhesive present on the enamel surface. Conclusion: There is a statistically significant decrease in SBS of irradiated enamel compared to that of non-irradiated teeth. However, the SBS observed in the three groups was well above the ideal SBS for orthodontic bonding, that is, 5·6–6·8 MPa. The adhesive remnant was found on all samples of the irradiated group. Deeper adhesive resin tags were found in the irradiated group in the resin–enamel interface.

Influence of Different Restoration Techniques on Fracture Resistance of Root-filled Teeth: In Vitro Investigation

2018 ◽  
Vol 43 (2) ◽  
pp. 162-169 ◽  
Author(s):  
ME Hshad ◽  
EE Dalkılıç ◽  
GC Ozturk ◽  
I Dogruer ◽  
F Koray
Keyword(s):  
Fracture Strength ◽  
Resin Composite ◽  
Testing Machine ◽  
Compressive Force ◽  
Control Group ◽  
Hybrid Resin ◽  
Flowable Composite ◽  
In Vitro Investigation ◽  
Significant Difference

SUMMARY Objective: The purpose of this study was to determine the fracture strength of endodontically treated mandibular premolar teeth restored with composites and different reinforcement techniques. Methods and Materials: Forty-eight freshly extracted human mandibular premolar teeth were randomly divided into four groups: group IN, group CR, group FRC, and group PRF. Group IN consisted of teeth with intact crowns and served as the control group. In the other three groups, endodontic treatment was performed and standard mesio-occluso-distal (MOD) cavities were prepared. Then cavities were restored with hybrid resin composite only, flowable composite and hybrid resin composite, and Ribbond, flowable composite and hybrid resin composite in groups CR, FRC and PRF, respectively. All of the teeth were subjected to fracture by means of a universal testing machine, and compressive force was applied with a modified stainless-steel ball at a crosshead speed at 0.5 mm/min. Results: The highest values were observed in group IN, while the lowest values were determined in group CR. There was not any statistically significant difference between group CR and group FCR (p>0.05). When groups CR, FCR, and PRF were compared, group PRF showed significantly better fracture strength than did groups CR and FCR (p<0.05). It was determined that there was not any significant difference between group IN and group PRF (p>0.05). Conclusions: Polyethylene ribbon fiber considerably increases the fracture strength of mandibular premolar teeth with MOD cavities restored with composite.

scholarly journals Do dental bleaching sessions prior to orthodontic treatment change the bond strength of esthetic brackets?

2021 ◽  
Vol 26 (4) ◽  
Author(s):  
Samara Gasperoni PERCIANO ◽  
Diego Patrik Alves CARNEIRO ◽  
Patricia Rafaela dos SANTOS ◽  
Américo Bortolazzo CORRER ◽  
Silvia Amélia Scudeler VEDOVELLO ◽  
...  
Keyword(s):  
Bond Strength ◽  
Orthodontic Treatment ◽  
Mechanical Test ◽  
Testing Machine ◽  
In Vitro Study ◽  
Treatment Change ◽  
Dental Bleaching ◽  
Adhesive Remnant Index ◽  
Level Of Significance

ABSTRACT Objective: The aim of this experimental in vitro study was to evaluate whether dental bleaching performed before orthodontic treatment change the shear bond strength (SBS) of monocrystalline and polycrystalline esthetic brackets. Methods: Sixty (60) bovine incisors teeth were used and randomly divided into the following six groups (n=10): SCP (without bleaching/polycrystalline brackets); SCM (without bleaching/monocrystalline brackets); 1CP (one bleaching session/polycrystalline brackets); 1CM (one bleaching session/monocrystalline brackets); 3CP (three bleaching sessions/polycrystalline brackets); and 3CM (three bleaching sessions/monocrystalline brackets). The brackets were bonded seven days after the bleaching sessions. The samples were submitted to the SBS test in a universal testing machine (Instron model 4411) at 1 mm/min crosshead speed. The two-way analysis of variance (ANOVA) and the Tukey tests were performed at a 5% level of significance. After the mechanical test, samples were evaluated to determine the adhesive remnant index (ARI). Results: The SBS values were significantly higher for the monocrystalline brackets, when compared with the polycrystalline type (p< 0.0001), and significantly higher with three bleaching sessions than without bleaching (p< 0.0436). The ARI showed predominance of failures between the bracket and resin for all the groups (score 3). Conclusion: Three dental bleaching sessions increased the SBS values. Monocrystalline brackets showed higher SBS values than the polycrystalline type.

scholarly journals Anti-Inflammatory Potential of Complex Extracts of Ligularia stenocephala Matsum. & Koidz. and Secale cereale L. Sprout in Chronic Gingivitis: In Vitro Investigation and Randomized Clinical Trial

Antioxidants ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1586
Author(s):  
Inpyo Hong ◽  
Jin-Young Park ◽  
Yoo-Hun Noh ◽  
Su-Hee Jeon ◽  
Jeong-Won Paik ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Cell Viability ◽  
Secale Cereale ◽  
Test Group ◽  
Number Of Patients ◽  
In Vitro Investigation ◽  
Secale Cereale L ◽  
Anti Inflammatory ◽  
Ligularia Stenocephala

Complex extracts of Ligularia stenocephala Matsum. & Koidz. (LSE) and Secale cereale L. sprout (SCSE) (TEES-10®) were prepared. The purposes of the study were to evaluate anti-inflammatory activities of TEES-10® in vitro and to observe resolution of gingivitis in human with oral administration of TEES-10®. The effects of TEES-10® on normal periodontal ligament (PDL) cell viability, lipopolysaccharide (LPS) induced PDL cell viability and the changes of inflammatory mediator expression were evaluated in vitro. In the clinical trial, 150 mg of TEES-10® powder containing capsule was administered twice daily to the test group, while the control group administered placebos in a total 100 participants with gingivitis. Probing depth (PD), bleeding on probing (BOP), clinical attachment loss, gingival index (GI) and plaque index (PI) were measured at baseline and 4 weeks. Administering TEES-10® showed significant increase in PDL cell viability compared to administering LSE or SCSE alone. In addition, treating TEES-10® to LPS induced PDL cell significantly increased PDL cell viability compared to control. TEES-10® suppressed expression of NF-κB, p-ERK, ERK, COX-2, c-Fos and p-STAT and promoted expression of PPARγ in LPS induced PDL cells. In the clinical trial, significant improvement of GI and BOP was observed in the test group at 4 weeks. In addition, the number of patients diagnosed with gingivitis was significantly reduced in the test group at 4 weeks. Salivary MMP-8 and MMP-9 was also significantly decreased compared to placebo group. Within the limitations of this study, the TEES-10® would have an anti-inflammatory potential clinically in the chronic gingivitis patients.

scholarly journals Prototype to measure bracket debonding force in vivo

2017 ◽  
Vol 22 (1) ◽  
pp. 82-88 ◽  
Author(s):  
Jéssika Lagni Tonus ◽  
Fernanda Borguetti Manfroi ◽  
Gilberto Antonio Borges ◽  
Eduardo Correa Grigolo ◽  
Sérgio Helegda ◽  
...  
Keyword(s):  
Bond Strength ◽  
Strain Gauge ◽  
Testing Machine ◽  
Orthodontic Brackets ◽  
Adhesive Remnant Index ◽  
Group 2 ◽  
Student’S T ◽  
Group 1

ABSTRACT Introduction: Material biodegradation that occurs in the mouth may interfere in the bonding strength between the bracket and the enamel, causing lower bond strength values in vivo, in comparison with in vitro studies. Objective: To develop a prototype to measure bracket debonding force in vivo and to evaluate, in vitro, the bond strength obtained with the prototype. Methods: A original plier (3M Unitek) was modified by adding one strain gauge directly connected to its claw. An electronic circuit performed the reading of the strain gauge, and the software installed in a computer recorded the values of the bracket debonding force, in kgf. Orthodontic brackets were bonded to the facial surface of 30 bovine incisors with adhesive materials. In Group 1 (n = 15), debonding was carried out with the prototype, while tensile bond strength testing was performed in Group 2 (n = 15). A universal testing machine was used for the second group. The adhesive remnant index (ARI) was recorded. Results: According to Student’s t test (α = 0.05), Group 1 (2.96 MPa) and Group 2 (3.08 MPa) were not significantly different. ARI score of 3 was predominant in the two groups. Conclusion: The prototype proved to be reliable for obtaining in vivo bond strength values for orthodontic brackets.

scholarly journals Proximal Contact Tightness Between Direct-composite Additions in the Posterior Dentition: An In Vitro Investigation

2012 ◽  
Vol 37 (3) ◽  
pp. 272-280 ◽  
Author(s):  
D Wolff ◽  
P Hahn ◽  
P Ding ◽  
T Maier-Kraus ◽  
C Frese ◽  
...  
Keyword(s):  
Metal Matrix ◽  
Testing Machine ◽  
Molar Tooth ◽  
Reference Analysis ◽  
Time Points ◽  
Universal Testing ◽  
In Vitro Investigation ◽  
Frictional Forces ◽  
Matrix Band

SUMMARY Purpose The aim of the study was to test whether a novel three-step matrix technique for posterior direct-composite additions creates sufficiently strong proximal contacts. Materials and Methods Contact tightness was measured between direct-composite additions and between original teeth on a model. Therefore, the frictional forces required to remove a straight, 0.05-mm-thick, metal matrix band inserted between adjacent teeth and held by a universal testing machine (Zwicki, Zwick GmbH, Ulm, Germany) were recorded. Measurements were taken at three time points to carry out reference analysis: at baseline, after removal of the maxillary right second premolar (tooth #15) to simulate a diastema, and after closure of the diastema by inserting two direct-composite additions with the three-step matrix technique on the maxillary right first premolar (tooth #14) and first molar (tooth #16). Measurements were performed in the maxillary right (first) and left (second) quadrants to document sagittal displacement. Results The original contact tightness values were between 1.65 ± 0.88 N and 3.05 ± 0.60 N in the first quadrant and between 1.23 ± 0.51 N and 2.18 ± 0.43 N in the second quadrant. After removal of tooth 15, values decreased significantly in the first quadrant and insignificantly in the second. After reconstruction, the contact tightness between teeth 14 and 16 was significantly stronger (tighter) (3.20 ± 0.80 N) than the originally measured contact tightness between teeth 14 and 15 (2.86 ± 0.64 N) and teeth 15 and 16 (1.65 ± 0.88 N) (p=0.006 and 0.001, respectively). Conclusions Within the limitations of an in vitro investigation, this study has shown that by using a novel, three-step matrix technique, direct posterior composite additions can form sufficiently tight proximal contacts.

scholarly journals Effect of fluoride solutions on the shear bond strength of orthodontic brackets

2012 ◽  
Vol 23 (6) ◽  
pp. 698-702 ◽  
Author(s):  
Gabriela da Rocha Leódido ◽  
Hianna Oliveira Fernandes ◽  
Mateus Rodrigues Tonetto ◽  
Cristina Dupim Presoto ◽  
Matheus Coêlho Bandéca ◽  
...  
Keyword(s):  
Bond Strength ◽  
Shear Bond Strength ◽  
Testing Machine ◽  
In Vitro Study ◽  
Orthodontic Brackets ◽  
Adhesive Remnant Index ◽  
Significant Difference ◽  
Tooth Surfaces ◽  
Pre Treatment

The aim of this in vitro study was to evaluate the shear bond strength of brackets after pre-treatment with different fluoride solutions. This study used 48 freshly extracted sound bovine incisors that were randomly assigned to 4 experimental groups (n=12). CG: (control) without treatment; NF: 4 min application of neutral fluoride; APF: application of 1.23% acidulated phosphate fluoride (APF) for 4 min; and SFV: application of 5% sodium fluoride varnish for 6 h. For each group, after surface treatment, prophylaxis of enamel and bracket bonding with Transbond XT composite resin (3M) were performed following the manufacturer's specifications. The shear bond strength was performed with a universal testing machine 24 h after fixing the brackets. The tooth surfaces were analyzed to verify the adhesive remnant index (ARI). Data were analyzed statistically by ANOVA and Tukey's test (α=0.05). There was statistically significant difference among the groups (p<0.0001). CG and NF groups presented significantly higher bond strength than APF and SFV. There was no significant difference between CG and NF or between APF and SFV (p>0.05). The analysis of ARI scores revealed that most failures occurred at the enamel-resin interface. It may be concluded that the pre-treatment of enamel with 1.23% APF and 5% SFV prior to fixing orthodontic brackets reduces shear bond strength values.

scholarly journals Does the CO2 laser reduce bond strength in different types of ceramic brackets?

2017 ◽  
Vol 22 (2) ◽  
pp. 55-60
Author(s):  
Fábio Lourenço Romano ◽  
Giovanna Pessoti ◽  
Rodrigo Galo ◽  
Jaciara Miranda Gomes-Silva ◽  
Marília Pacífico Lucisano ◽  
...  
Keyword(s):  
Bond Strength ◽  
Co2 Laser ◽  
Testing Machine ◽  
Adhesive Remnant Index ◽  
Different Types ◽  
Tooth Surfaces ◽  
Ceramic Brackets ◽  
Ceramic Bracket ◽  
One Way Anova

ABSTRACT OBJECTIVE: The aim of this study was to assess in vitro the influence of the CO2 laser and of the type of ceramic bracket on the shear bond strength (SBS) to enamel. METHODS: A total of 60 enamel test surfaces were obtained from bovine incisors and randomly assigned to two groups, according to the ceramic bracket used: Allure (A); Transcend (T). Each group was divided into 2 subgroups (n = 15): L, laser (10W, 3s); C, no laser, or control. Twenty-four hours after the bonding protocol using Transbond XT, SBS was tested at a crosshead speed of 0.5 mm/min in a universal testing machine. After debonding, the Adhesive Remnant Index (ARI) was evaluated at 10 x magnification and compared among the groups. Data were analyzed by one-way ANOVA, Tukey’s, Mann-Whitney’s and Kruskal-Wallis tests (α = 0.05). RESULTS: Mean SBS in MPa were: AL = 0.88 ± 0.84; AC = 12.22 ± 3.45; TL = 12.10 ± 5.11; TC = 17.71 ± 6.16. ARI analysis showed that 73% of the specimens presented the entire adhesive remaining on the tooth surfaces (score 3). TC group presented significantly higher SBS than the other groups. The lased specimens showed significantly lower bond strength than the non-lased groups for both tested brackets. CONCLUSION: CO2 laser irradiation decreased SBS values of the polycrystalline ceramic brackets, mainly Allure.

A Prospective Randomised Clinical Trial of the Intra-Operative Use of 5-Fluorouracil on the Outcome of Dupuytren’s Disease

2004 ◽  
Vol 29 (1) ◽  
pp. 18-21 ◽  
Author(s):  
N. W. BULSTRODE ◽  
M. BISSON ◽  
B. JEMEC ◽  
A. L. PRATT ◽  
D. A. MCGROUTHER ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Joint Angle ◽  
Randomised Clinical Trial ◽  
Angle Measurement ◽  
Flexion Deformity ◽  
Double Blind ◽  
Significant Difference ◽  
Operative Complications

5-Fluorouracil reduces proliferation rates of fibroblasts, myofibroblast differentiation and contractility of ocular fibroblasts in vitro. This double-blind randomized clinical trial assesses whether intra-operative topical treatment with 5-fluorouracil reduces the recurrence rate after limited excision of Dupuytren’s tissue. Patients with two-digit disease were randomized to having 5-fluorouracil (25 mg/ml) treatment for 5 minutes on one digit and placebo on the other. Fifteen patients were enrolled with 18 months follow-up. There were no peri-operative complications. Wound healing was not delayed and there was no deterioration in the flexion deformity of the 5-fluorouracil treated digits. Patients were subsequently assessed by joint angle measurement at 3, 6, 12 and 18 months. There was no significant difference between control and 5-fluorouracil treated digits.

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