scholarly journals An In Vivo Spectrophotometric Analysis of Gingival Acrylic Shade Guide

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1768
Author(s):  
Peter C. Grieco ◽  
John D. Da Silva ◽  
Yoshiki Ishida ◽  
Shigemi Ishikawa-Nagai
Keyword(s):  
Color Difference ◽  
Spectrophotometric Analysis ◽  
Gingival Tissue ◽  
Clinical Appearance ◽  
Coverage Error ◽  
Significant Difference ◽  
Guide System ◽  
Post Hoc ◽  
Shade Guide

Selecting shades of acrylic gingival restorative material is challenging. This study examined the shade appropriateness of five acrylic gingival restorative materials. The color was analyzed using an intraoral spectrophotometer (Crystaleye®, Olympus). The gingival color of maxillary incisors for eighty-nine patients was measured. CIELAB color coordinates (L*, a* and b*) were obtained, and the color difference ∆E (Coverage Error: CE) between shade tabs and natural gingival color of patient samples for each shade guide system were compared. Repeated ANOVA and post hoc analyses with Tukey′s HSD were performed. There was a significant difference among the mean minimum CEs of the tab sets (p < 0.01). GC Acrylic (CE = 5.89 ∆E ± 2.97) and Lucitone 199® (CE = 6.55 ± 3.33) groups exhibited CEs significantly lower than all other groups (all p < 0.001). The IvoCap® system exhibited the highest CE (10.78 ± 3.80), significantly greater than all other groups (p < 0.001). No significant differences were observed based on sex (p = 0.055) or ethnicity (p = 0.327). The GC Acrylic and Lucitone 199® shade guides showed the lowest CEs. All guides had coverage errors above 5.89 ∆E, which is larger than ∆E thresholds of acceptability. Of the materials evaluated in this study, GC Acrylic and Lucitione 199® are best able to reproduce the clinical appearance of the gingival tissue. Many patients have tissue that cannot be reproduced accurately with currently available materials.

scholarly journals Comparison of Orthodontic Bracket Debonding Force and Bracket Failure Pattern on Different Teeth In Vivo by a Prototype Debonding Device

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Tamzid Ahmed ◽  
Norma Ab Rahman ◽  
Mohammad Khursheed Alam
Keyword(s):  
Failure Pattern ◽  
Point Scale ◽  
Orthodontic Bracket ◽  
Adhesive Remnant Index ◽  
Significant Difference ◽  
Different Types ◽  
Post Hoc ◽  
Bracket Failure ◽  
One Way Anova

Objective. To compare the orthodontic bracket debonding force and assess the bracket failure pattern clinically between different teeth by a validated prototype debonding device. Materials and Method. Thirteen (13) patients at the end of comprehensive fixed orthodontic treatment, awaiting for bracket removal, were selected from the list. A total of 260 brackets from the central incisor to the second premolar in both jaws were debonded by a single clinician using a validated prototype debonding device equipped with a force sensitive resistor (FSR). Mean bracket debonding forces were specified to ten (10) groups of teeth. Following debonding, Intraoral microphotographs of the teeth were taken by the same clinician to assess the bracket failure pattern using a 4-point scale of adhesive remnant index (ARI). Statistical analysis included one-way ANOVA with post hoc Tukey HSD and independent sample t -test to compare in vivo bracket debonding force, Cohen’s kappa ( κ ), and a nonparametric Kruskal-Wallis test for the reliability and the assessment of ARI scoring. Results. A significant difference ( p < 0.001 ) of mean debonding force was found between different types of teeth in vivo. Clinically, ARI scores were not significantly different ( p = 0.921 ) between different groups, but overall higher scores were predominant. Conclusion. Bracket debonding force should be measured on the same tooth from the same arch as the significant difference of mean debonding force exists between similar teeth of the upper and lower arches. The insignificant bracket failure pattern with higher ARI scores confirms less enamel damage irrespective of tooth types.

Pimpinella anisum essentiel oil enhances spatial learning performance of rats exposed to Hgcl2 during the developmental period

2019 ◽  
Vol 8 (4) ◽  
pp. 162-166
Author(s):  
Arabi Wafaa ◽  
Kahloula Khaled ◽  
Adli Djallal E.H. ◽  
Ziani Kaddour ◽  
Slimani Miloud
Keyword(s):  
Essential Oil ◽  
Developmental Period ◽  
Learning Performance ◽  
Mercury Chloride ◽  
Lactation Period ◽  
Pimpinella Anisum ◽  
Significant Difference ◽  
Post Hoc

The essential oil of Pimpinella anisum has been widely used in traditional medicine to treat a variety of diseases. This study was aimed to test, in vivo, effect of exposition to mercury chloride (100mg/L) in wistar rats during the gestation and lactation period. On the other hand, treatment of pups with essential oil of P. anisum (0.25 ml/kg) for 21 days. The behavioural patterms evaluated was spatial memory ( Morris water maze) and the determination of mercury concentration in blood and brain. The data were analysed by two way analyses of variance (ANOVAs). When a significant difference was found, the Student Newman Keuls post hoc test was conducted. The results of the present study demonstrated that exposure to mercury in developmental period induced, significantly decrease of the learning performance (p < 0.01; p < 0.05) compared to control rats. Thus, the concentration of mercury in the intoxicated group is high in the blood and brain. However, the administration of P. anisum essential oil resulted into an improvement of learning perfor-mance (p< 0.01; p< 0.05) and reduction of mercury blood and brain mercury. In conclusion, our results demonstrate that mercury exposure during the developmental period induces learning disabilities and remains trapped in blood and brain. This could be improved by the treatment with Pimpinella anisum essential oil.

Longevity, Esthetic Perception, and Psychosocial Impact of Teeth Bleaching by Low (6%) Hydrogen Peroxide Concentration for In-office Treatment: A Randomized Clinical Trial

2017 ◽  
Vol 42 (1) ◽  
pp. 41-52 ◽  
Author(s):  
E Fernández ◽  
C Bersezio ◽  
J Bottner ◽  
F Avalos ◽  
I Godoy ◽  
...  
Keyword(s):  
Clinical Trial ◽  
Hydrogen Peroxide ◽  
Randomized Clinical Trial ◽  
Positive Impact ◽  
Color Difference ◽  
Psychosocial Impact ◽  
Bleaching Procedure ◽  
Significant Difference ◽  
Before And After ◽  
Shade Guide

SUMMARY Objective: The aim was to evaluate the color longevity after nine months of in-office bleaching with gel (6% hydrogen peroxide), to compare this to a control concentration of 35% in a split-mouth study model, and to assess the dental confidence and psychosocial impact on patients. Methods and Materials: Twenty-seven patients were assessed at the nine-month recall. The bleaching procedure with 6% or 35% hydrogen peroxide gel was performed randomly in the upper hemi-arch of each patient. The color was measured at baseline and at one week, one month, and nine months after the procedure, using the Vita Easyshade spectrophotometer, the Vita classical shade guide organized by value, and Vita Bleach Guide 3DMaster. Moreover, two surveys, OHIP-Esthetics and PIDAQ, were used to assess the esthetic self-perception and psychosocial impact of the bleaching procedure. During the nine-month recall, the color was assessed before and after dental prophylaxis. Results: Twenty-seven patients participated in the nine-month recall. There was a significant difference in ΔE between the two groups at all times assessed (p&lt;0.011). The ΔL, Δa, and Δb showed a difference between the two groups at all times assessed (p&lt;0.038), except for ΔL from the baseline vs nine-month after prophylaxis value (p&gt;0.20). There was no significant difference in ΔSGU at all times (p&gt;0.05). There was a significant difference in OHIP-Esthetics and PIDAQ sums compared with baseline scores (p&lt;0.03). Conclusion: The two compounds remained effective at nine months, with a slight rebound of color, and maintained their objective color difference but not the subjective color difference. Patients were satisfied with the bleaching procedure, and this had a positive impact on esthetic perception and a positive psychosocial impact at the nine-month recall.

scholarly journals Variations in the Shades of Contemporary Dental Ceramics: An In Vitro Analysis

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1288
Author(s):  
Syed Rashid Habib ◽  
Abdulaziz Saud Al Rashoud ◽  
Turki Ali Safhi ◽  
Abdulrahman Hamad Almajed ◽  
Hamad Ali Alnafisah ◽  
...  
Keyword(s):  
Statistical Tests ◽  
Color Difference ◽  
Ceramic Materials ◽  
Dental Ceramics ◽  
Color Differences ◽  
Monolithic Zirconia ◽  
Vitro Analysis ◽  
Post Hoc ◽  
Shade Guide

Background: To identify and compare the shade variations of various commonly used esthetic dental ceramics by calculating their total-color-difference (ΔE) and translucency parameter (TP) using a spectrophotometer. Methods: In total, 165 disc specimens from three shades (A1, B1, and C1) of five ceramic materials (N = 55/shade; n = 11/ceramic material group) were prepared (Metal-ceramic (MC), IPS e.max press (Emax-P), IPS e.max layer (Emax-L), Layered Zirconia (Zr-L) and Monolithic zirconia (Zr-M)). With a spectrophotometer, the L*a*b* values were obtained. Total color differences (ΔE = [(ΔL*)2 + (Δa*)2 + (Δb*)2]1/2) and translucency parameter (TP = [(L*B − L*W)2 + (a*B − a*W)2 + (b*B – b*W)2]1/2) were calculated. The statistical tests included ANOVA and Post hoc Tukey’s analysis (p < 0.05). Results: Significant differences (p = 0.000) were found between the groups for ΔE. Highest ΔE (A1) were found for Zr-L (80.18 ± 20) and lowest for Zr-M (62.97 ± 1.28). For B1, highest ΔE values were noted for MC (76.85 + 0.78) and lowest for the Emax-L (62.13 ± 1.49). For C1, highest ΔE values were found for the MC group (73.96 ± 0 67) and lowest for Emax-P (55.09 ± 1.76). Translucency variations between tested ceramics were revealed (p < 0.05). Highest TP values (A1) were found for Emax-L (2.99 ± 1.64) and lowest for Zr-L (0.35 ± 0.16). For B1, highest TP values were noted for Emax-P (3.50 ± 1.74) and lowest for MC (0.57 ± 0.40). For C1, highest TP values were found for Emax-P (4.46 ± 2.42) and lowest for MC (0.58 ± 0 48). Conclusions: Significant differences in ΔE and TP were found for tested ceramic groups. The color differences of the tested materials varied according to clinical acceptability, even with the selection of same color/shade. The color/shades of the various dental ceramics do not match with the vita shade guide tabs, to which they are compared most often. Shade differences are present between different lots of ceramic materials from the same or different brands.

scholarly journals Comparative Evaluation of Mixture of Calcium Hydroxide and Chlorhexidine, with Triple Antibiotic Paste and Combination of Calcium Hydroxide, Chlorhexidine, and Lycopene on Incidence of Interappointment Flare-up: An in vivo Study

2017 ◽  
Vol 1 (1) ◽  
pp. 10-14
Author(s):  
Priyanka S Bilgi ◽  
Nimisha C Shah ◽  
Jash Mehta
Keyword(s):  
Calcium Hydroxide ◽  
Comparative Evaluation ◽  
Rating Scale ◽  
Clinical Performance ◽  
Group Iii ◽  
Group I ◽  
Triple Antibiotic Paste ◽  
Significant Difference ◽  
Post Hoc

ABSTRACT Background The present study was undertaken to evaluate the most suitable intracanal medicament with the least incidence on Interappointment flare-up. Aim To clinically evaluate and compare the effect of combination of calcium hydroxide (CH) and chlorhexidine (CHX) with triple antibiotic paste and combination of CH, CHX, and lycopene on interappointment flare-up. Materials and methods A total of 36 patients requiring root canal treatment were selected according to the selection criteria and divided into three groups: Group I – CH and CHX, group II – triple antibiotic paste, and group III – CH, CHX, and lycopene. Access opening and biomechanical preparation of all samples, and intracanal medicaments were placed respectively. Subsequently, interappointment flare-up was assessed at 1, 2, 3, 7, and 14 days using verbal rating scale. Statistical analysis used One way analysis of variance test and Tukey's post hoc test. Results There was no statistically significant difference seen in the clinical performance of CH + CHX, triple antibiotic paste, and mixture of CH + CHX + lycopene at the end of 14 days in terms of interappointment flare-up. Conclusion All the intracanal medicaments were effective in reducing interappointment flare-up at the end of 14 days. How to cite this article Bilgi PS, Shah NC, Mehta J. Comparative Evaluation of Mixture of Calcium Hydroxide and Chlorhexidine, with Triple Antibiotic Paste and Combination of Calcium Hydroxide, Chlorhexidine, and Lycopene on Incidence of Interappointment Flare-up: An in vivo Study. Int J Clin Dent Res 2017;1(1):10-14.

The Programming of Dentistry CCS/CCM Software

2013 ◽  
Vol 544 ◽  
pp. 502-506
Author(s):  
Yan Zhao ◽  
Li Sheng Zhao ◽  
Jian Feng Chen ◽  
Bin Deng ◽  
Bin Gu ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Dental Materials ◽  
Color Difference ◽  
Color Matching ◽  
System Transformation ◽  
Difference Analysis ◽  
Color Data ◽  
Stable Performance ◽  
Guide System ◽  
Shade Guide

Objective: We aimed to develop a multi-functional CCS/CCM (Computerized Color Selecting/Computer Color Matching) software so as to provide more practical colorimetric software for clinical use and further researches. Methods: This software used the 6 dental prosthetic materials and color data from 4 shade guide system which were most frequently-used in clinic currently as basic database, to program 5 functional blocks including respectively CCS/CCM system; Dental Material Chromatic Value System; Vita Information System; Transformation of Colorimeter System; and Chromatic Value Difference Analysis. These modules had the functions of information inquiry of different types of dental materials and their corresponding chromatic value, color matching, transforming, and color difference analysis. Results: The software had a convenient operation interface which could guarantee a stable performance. Containing various shade block and chromatic value, and transformation among different colors, this software analysed the color difference in the database, improved the accuracy and reliability of dental color choosing, and, to some extent, increased the color repetition rate of prosthesis. Conclusion: The software could well meet the needs of clinical dental colorimeter and choosing, increase the color repetition rate of prosthesis, and easily finish the transformation among different colors. It had more functions to adapt clinical need.

Accuracy of Buccal Scan Procedures for the Registration of Habitual Intercuspation

2018 ◽  
Vol 43 (6) ◽  
pp. 573-580 ◽  
Author(s):  
M Zimmermann ◽  
A Ender ◽  
T Attin ◽  
A Mehl
Keyword(s):  
Statistical Analysis ◽  
Analysis Software ◽  
Scheffe Test ◽  
Intraoral Scanning ◽  
Significant Difference ◽  
Mandibular Teeth ◽  
Post Hoc ◽  
Relationship Of ◽  
Scanning Systems

SUMMARY Clinical Relevance: Accurate reproduction of the jaw relationship is important in many fields of dentistry. Maximum intercuspation can be registered with digital buccal scan procedures implemented in the workflow of many intraoral scanning systems. Objective: The aim of this study was to investigate the accuracy of buccal scan procedures with intraoral scanning devices for the registration of habitual intercuspation in vivo. The hypothesis was that there is no statistically significant difference for buccal scan procedures compared to registration methods with poured model casts. Methods and Materials: Ten individuals (full dentition, no dental rehabilitations) were subjects for five different habitual intercuspation registration methods: (CI) poured model casts, manual hand registration, buccal scan with inEOS X5; (BC) intraoral scan, buccal scan with CEREC Bluecam; (OC4.2) intraoral scan, buccal scan with CEREC Omnicam software version 4.2; (OC4.5β) intraoral scan, buccal scan with CEREC Omnicam version 4.5β; and (TR) intraoral scan, buccal scan with Trios 3. Buccal scan was repeated three times. Analysis of rotation (Rot) and translation (Trans) parameters was performed with difference analysis software (OraCheck). Statistical analysis was performed with one-way analysis of variance and the post hoc Scheffé test (p&lt;0.05). Results: Statistical analysis showed no significant (p&gt;0.05) differences in terms of translation between groups CI_Trans (98.74±112.01 μm), BC_Trans (84.12±64.95 μm), OC4.2_Trans (60.70±35.08 μm), OC4.5β_Trans (68.36±36.67 μm), and TR_Trans (66.60±64.39 μm). For rotation, there were no significant differences (p&gt;0.05) for groups CI_Rot (0.23±0.25°), BC_Rot (0.73±0.52°), OC4.2_Rot (0.45±0.31°), OC4.5β_Rot (0.50±0.36°), and TR_Rot (0.47±0.65°). Conclusions: Intraoral scanning devices allow the reproduction of the static relationship of the maxillary and mandibular teeth with the same accuracy as registration methods with poured model casts.

scholarly journals Force decay evaluation of latex and non-latex orthodontic intraoral elastics: in vivo study

2018 ◽  
Vol 23 (6) ◽  
pp. 42-47 ◽  
Author(s):  
Daniela Ferreira de Carvalho Notaroberto ◽  
Mariana Martins e Martins ◽  
Maria Teresa de Andrade Goldner ◽  
Alvaro de Moraes Mendes ◽  
Cátia Cardoso Abdo Quintão
Keyword(s):  
Clinical Study ◽  
Testing Machine ◽  
Material Degradation ◽  
Force Decay ◽  
Significant Difference ◽  
Post Hoc ◽  
Zero Time ◽  
Paired T Test ◽  
Over Time

ABSTRACT Objective: This clinical study was conducted in order to evaluate force decay over time of latex and non-latex orthodontic intraoral elastics. Methods: Patients (n = 15) were evaluated using latex and non-latex elastics in the periods of : 0, 1, 3, 12 and 24 hours. The rubber bands were transferred to the testing machine (EMIC DL-500 MF), and force values were recorded after stretching the elastic to a length of 25mm. Paired t test was applied and analysis of variance (ANOVA) was used to evaluate the variation of force generated. LSD (Fisher’s least significant difference) post-hoc test was thus employed. Results: As regards the initial forces (zero time), the values of force for non-latex elastic were slightly higher than for the latex elastic. In the subsequent times, the forces generated by the latex elastic showed higher values. Regarding the material degradation, at the end of 24 hours the highest percentage was observed for non-latex elastic. Conclusions: The latex elastics had a more stable behavior during the studied period, compared with non-latex.

scholarly journals A comparative in-vivo evaluation of the alignment efficiency of 5 ligation methods: A prospective randomized clinical trial

2014 ◽  
Vol 08 (01) ◽  
pp. 023-031 ◽  
Author(s):  
Vijaya Bhaskara Reddy ◽  
Talapaneni Ashok Kumar ◽  
Mandava Prasad ◽  
Sivakumar Nuvvula ◽  
Rajedra Goud Patil ◽  
...  
Keyword(s):  
Randomized Study ◽  
Initial Alignment ◽  
In Vivo Evaluation ◽  
Irregularity Index ◽  
Space Closure ◽  
Significant Difference ◽  
Pre Treatment ◽  
Post Hoc ◽  
Leveling And Alignment

ABSTRACT Objectives: To conduct a prospective randomized study comparing the efficiency of 5 different ligation systems (ELL; elastomeric ligature, SSL; stainless steel ligature, LL; leone slide ligature, PSL; passive self-ligation and ASL; active self-ligation) over the duration of mandibular crowding alleviation. Materials and Methods: Fifty consecutive patients (54.2% male, 45.8% female; mean age: 16.69 years) satisfying the inclusion criteria were randomly allocated to 5 ligation groups with an equal sample size of 10 per group. The 5 groups received treatment with 0.022-inch MBT pre-adjusted edge-wise technique (ELL: Gemini 3M Unitek, SSL: Gemini 3M Unitek, LL: Gemini 3M Unitek, PSL: SmartClip 3M Unitek and ASL: In-Ovation R Euro GAC International). The models and cephalograms were evaluated for anterior arch alignment, extraction space closure, and lower incisal inclinations at pre-treatment T1 and at the end of initial alignment T2. Analysis of variance (ANOVA) and Post-hoc tests were used for data analysis. Results: Forty-eight participants completed the study, and SL systems showed a significant difference over CL groups in time to alignment, passive space closure, and incisal inclination. Multiple regression showed a reduction of 5.28 days in time to alignment by changing the ligation group in the order of ELL to ASL group and 1 mm increase in initial irregularity index increases time to alignment by 11.68 days. Conclusion: Self-ligation brackets were more efficient than conventional ligation brackets during initial leveling and alignment.

scholarly journals A Study to Evaluate and Compare Efficacy of Denture Adhesives in Complete Denture Patients

2018 ◽  
Vol 06 (01) ◽  
pp. 007-013
Author(s):  
Supreet Chhabra ◽  
Sandeep Garg ◽  
Nidhi Kalra
Keyword(s):  
Complete Denture ◽  
P Value ◽  
Time Intervals ◽  
Intergroup Comparison ◽  
Significant Difference ◽  
Denture Adhesives ◽  
Spss Software ◽  
Edentulous Patients ◽  
Post Hoc

Abstract Aim To evaluate and compare the retentive ability of commonly available denture adhesives in completely edentulous patient at different time intervals. Materials and Methods Ten completely edentulous patients were included in the present in vivo study. Complete dentures were fabricated, and retention of maxillary denture was recorded with and without denture adhesives (Fixon Supergrip powder, Fittydent paste, Super Poligrip powder, and Fit Fix powder) at 15 minutes, 1 hour, and 2 hours intervals for all patients. Force at which denture dislodged was recorded with digital force gauge and was considered as retentive value. Data obtained were tabulated and subjected to statistical analysis using SPSS software version 17.5 (Trial version). Intragroup comparison was done using paired t-test. Intergroup comparison was done using analysis of variance (ANOVA) followed by post hoc Tukey's test. p-Value ≤ 0.05 was considered significant in all tests. Results Mean retention force of maxillary complete denture achieved with all four denture adhesives was significantly better than without adhesive at all time intervals. Intragroup comparison showed that each adhesive exhibited no change (p ≤ 0.05) in retention from 15 minutes to 2 hours interval except Fixon Supergrip powder adhesive which showed significant decrease (p = 0.009) in retention from 1 hour to 2 hours. Intergroup comparison revealed no statistically significant difference in retention of maxillary dentures with different denture adhesives at all time intervals (p ≥ 0.05). Conclusion Within the limitations of the study, it was concluded from the present study that all four adhesives irrespective of their form can be used to improve retention of dentures.

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