Kanchan Sawlani’s research while affiliated with University of Alabama at Birmingham and other places

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Publications (4)


Factors influencing the progression of noncarious cervical lesions: A 5-year prospective clinical evaluation
  • Article

January 2016

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115 Reads

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61 Citations

Journal of Prosthetic Dentistry

Kanchan Sawlani

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John O. Burgess

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[...]

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Lance Ramp

Statement of problem: The etiology (chemical, friction, abfraction) of noncarious cervical lesion (NCCL) progression is poorly understood. Purpose: The purpose of this 5-year prospective clinical trial was to measure the relationship between NCCLs and various etiologic factors. Material and methods: After review board approval, 29 participants with NCCLs were enrolled. Polyvinyl siloxane impressions were made of each NCCL, and casts were poured at baseline, 1, 2, and 5 years. The casts were scanned with a noncontact profilometer, and 1-, 2-, and 5-year scans were superimposed over baseline scans to measure volumetric change in NCCLs. T-scan and Fujifilm Prescale films were used to record relative and absolute occlusal forces on teeth with NCCLs at the 5-year recall. Participant diet, medical condition, toothbrushing, and adverse oral habit questionnaires were given at the 5-year recall. Occlusal analysis was completed on mounted casts to determine the presence of wear facets and group function. Volumetric lesion progression from 1 to 5 years was correlated to absolute and relative occlusal force using mixed model analysis. The Kruskall-Wallis and Mann-Whitney analyses compared lesion progression with diet, medical condition, toothbrushing, adverse oral habits, wear facets, and group function. Results: The NCCL progression rate over 5 years was 1.50 ±0.92 mm(3)/yr. The rate of progression of NCCLs was related to mean occlusal stress (P=.011) and relative occlusal force (P=.032) in maximum intercuspation position. No difference was seen in NCCL progression between participants with any other factors. Conclusion: Heavy occlusal forces play a significant role in the progression of NCCLs.


Two-year clinical trial of a universal adhesive in total-etch and self-etch mode in non-carious cervical

July 2015

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240 Reads

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160 Citations

Journal of Dentistry

To compare the clinical performance of Scotchbond™ Universal Adhesive used in self- and total-etch modes and two-bottle Scotchbond™ Multi-purpose Adhesive in total-etch mode for Class 5 non-carious cervical lesions (NCCLs). 37 adults were recruited with 3 or 6 NCCLs (>1.5mm deep). Teeth were isolated, and a short cervical bevel was prepared. Teeth were restored randomly with Scotchbond Universal total-etch, Scotchbond Universal self-etch or Scotchbond Multi-purpose followed with a composite resin. Restorations were evaluated at baseline, 6, 12 and 24 months for marginal adaptation, marginal discoloration, secondary caries, and sensitivity to cold using modified USPHS Criteria. Patients and evaluators were blinded. Logistic and linear regression models using a generalized estimating equation were applied to evaluate the effects of time and adhesive material on clinical assessment outcomes over the 24-month follow-up period. Kaplan-Meier method was used to compare the retention between adhesive materials. Clinical performance of all adhesive materials deteriorated over time for marginal adaptation, and discoloration (p < .0001). Both Scotchbond Universal self-etch and Scotchbond Multi-purpose materials were more than three times as likely to contribute to less satisfying performance in marginal discoloration over time than Scotchbond Universal total-etch. The retention rates up to 24 months were 87.6%, 94.9% and 100% for Scotchbond Multi-purpose and Scotchbond Universal self-etch and total-etch respectively. Scotchbond Universal in self- and total- etch modes performed similar to or better than Scotchbond Multipurpose respectively. 24 month evaluation of a universal adhesive indicates acceptable clinical performance, particularly in a total-etch mode. Copyright © 2015. Published by Elsevier Ltd.


Tear Strength of Eight Commercially Available Elastomeric Impression Materials

March 2014

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38 Reads

Capturing accurate margins is essential for clinically acceptable impressions. Impression materials should have sufficient tear strength to prevent tearing at thin marginal areas, when removing the impression from the mouth. Objective: To measure and compare the tear strengths of eight elastomeric impression materials' specimens using two dimensions. Method: Bogoshian axial-notched molds were used to fabricate specimens (101.6mm X 19.05mm X 2.7mm) for each material. The mold had a V-shaped notch in the center (producing a specimen thickness of 0.30 mm with one mold and 0.50mm with the other). The impression material was injected into the mold, sealed and placed in a water bath (351C) at 20 seconds after start of mixing. Specimens were stored in the water bath till the manufacturers' recommended mouth removal time (MRT). When this time elapsed, the specimens were removed from the water bath, de-molded and gripped at the edges with the pneumatic grips of the Instron (Model 5582). At 90 seconds after the designated mouth removal time, specimens were loaded in tension with a cross-head speed of 500mm/min until failure. Results: Mean tensile strengths of the impression materials among the two molds were compared using ANOVA and Tukey HSD post-hoc test (p=.05). Higher values are indicative of greater resistance to tearing. Molds and materials were significant factors (p<.05). Same superscripts indicate results that are not statistically different (n=10). Impression Materials Immediate Tear Strength (MPa/MeanSD) 0.50mm 0.30mm Imprint 4 Light/3M ESPE 2.530.17C,D,E 2.090.28A,B,C Aquasil Monophase/ DENTSPLY 4.190.49I 3.370.44F,G,H Take 1 Advanced/KERR 1.870.31A,B 1.580.17A Exa'lence/GC AMERICA 2.230.29B,C 2.250.33B,C Genie Extra-light body /SULTAN 2.500.20C,D,E 2.430.40C,D Imprint 3/3M ESPE 2.940.36D,E,F 3.010.20E,F,G TMIM Wash-Multi(Tissue Management Impression Mat)/DENTSPLY 3.770.34H,I 3.480.38F,G,H TMIM Tray/ DENTSPLY 3.720.59H,I 3.500.41G,H Conclusion: Our study shows that Aquasil Monophase and TMIM (Tray and wash) showed relatively higher tear strengths.


In Vitro Wear of Eight Bulk Placed and Cured Composites

March 2013

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748 Reads

Wear resistance is a clinical concern for composites (flowable and packable) that are being developed for bulk placement and curing in posterior restorations. Objective: To determine and compare in vitro three-body wear of 8 commercially available bulk placed composites. Methods: Eight flat disc specimens (n=8) of each composite material (d=8mm/h=2mm) were prepared using a cylindrical elastomeric mold following manufacturers' instructions, and were light-cured in a single increment (Elipar S10/3M ESPE/1000 mW/cm2). The specimens were mounted in brass holders (d=15mm) using self-cured acrylic resin, wet ground (320-, 800- and 1200- grit SiC paper) and finished (0.05 alumina slurry/polishing cloth). After polishing they were rinsed, cleaned (ultrasonic bath in distilled water for 5 minutes) and stored (24h/distilled water/37C). Wear test was conducted on an Alabama Wear Testing Device for 100,000 cycles (load=75N/1.2 Hz). 50 PMMA beads were used as third body media. Volumetric loss for each material was determined using a 3-D non-contact surface profilometer (Proscan2000/Scantron/UK). Data were analyzed with one-way ANOVA and post-hoc Tukey/Kramer test (p=0.05). Results: (MeanSD). Same letters are not statistically different. Materials Type Volume/(mm3) Venus Bulk Fill-Flowable/Heraeus Kulzer Flowable/nano-hybrid 0.0240.004A,F Filtek Bulk Fill/3M ESPE 0.0120.001B,C Tetric Evo Ceram BulkFill/Ivoclar Nano-hybrid 0.0110.002C SureFil High Density Posterior Restorative (HDR)/Dentsply Packable 0.0070.001D SureFil SDR Flow/Dentsply Flowable 0.040.01E Sonic Fill/Kerr Packable/nano-hybrid/sonically activated delivery 0.020.004F Z100/3M ESPE/(Control) Packable/microhybrid 0.0040.001G Z100 produced the least amount of wear whereas SureFil SDR Flow produced the highest compared to rest of the materials (p<.0001). Conclusions: Since wear differs significantly between materials, it should be a factor in the selection of bulk filled composite resins. Materials that do not have high wear resistance should be covered with a wear resistant composite.

Citations (2)


... 4 NCCLs will continue to progress if left untreated, despite their non-carious nature. 5 These lesions, characterized by the loss of the enamel and dentin structure can lead to tooth sensitivity while lesions can compromise pulp vitality. 6 Restoring deep NCCLs is necessary not only for aesthetic reasons, but also to preserve the tooth's structural integrity and prevent fractures. ...

Reference:

Effect of composite resins with and without fiber-reinforcement on the fracture resistance of teeth with non-carious cervical lesions
Factors influencing the progression of noncarious cervical lesions: A 5-year prospective clinical evaluation
  • Citing Article
  • January 2016

Journal of Prosthetic Dentistry

... The sample size was calculated based on a previous study 16 , in which success rate of resin composite cervical restorations using universal adhesive in total etch mode was 100% after 24 months. A two-tailed Z test was conducted to determine the difference between two independent proportions, with a 5% significance level (alpha) and 80% power. ...

Two-year clinical trial of a universal adhesive in total-etch and self-etch mode in non-carious cervical
  • Citing Article
  • July 2015

Journal of Dentistry