This study was performed to assess the radiopacity of a variety of root canal sealers according to the specification concerning root canal sealers.

Ten materials including Tubli-Seal™, Kerr Pulp Canal Sealer™, AH 26®, AH plus®, AH plus jet™, Ad sea l™, Sealapex™, NOGENOL™, ZOB seal™, Epiphany™ and dentin were evaluated in this study. In the first part, densitometric reading of an each step of aluminum step wedge on occlusal film was performed at different voltage and exposure time. In the second part, ten specimens were radiographed simultaneously with an aluminum step wedges on the occlusal films under decided condition. The mean radiographic den sity values of the materials were transformed into radiopacity expressed equivalent thickness of aluminum (mm Al).

The following results were obtained.

1. Among the various conditions, the appropriate voltage and exposure time that meet the requirement density was 60 kVp at 0.2 s

2. All of the materials had greater radiopacity than 3 mm Al requirement of ANSI/ADA specification No. 57 (2000) and ISO No. 6876 (2001) standards.

3. The radiopacity of materials increased as thickness of materials increased.

4. The mm Al value of each specimen at 1mm in thickness has a significant difference in the statistics.

It suggests that root canal sealers have a sufficient radiopacity that meet the requirement.

Citations

Citations to this article as recorded by  

• Evaluation of radiopacity and discriminability of various fiber reinforced composite posts
  Eun-Hye Lee, Hang-Moon Choi, Se-Hee Park, Jin-Woo Kim, Kyung-Mo Cho
  Journal of Korean Academy of Conservative Dentistry.2010; 35(3): 188.     CrossRef

This study was done to evaluate transportation of the apical foramen after 0.5 mm overinstrumentation by ProFile, ProTaper and K³ in simulated resin root canal.

Sixty simulated resin root canal with a curvature of J and S-shape were divided into two groups. Each group consisted of three subgroups with 10 blocks according to the instruments used: ProFile®, ProTaper™, and K^3TM. Simulated resin root canal was prepared by ProFile, ProTaper and K³ with 300 rpm by the crown-down preparation technique. Pre- and post-instrumentation apical foramen images were overlapped and recorded with Image-analyzing microscope 100X (Camcope, Sometech Inc, Korea). The amounts of difference in width and dimension on overlapped images were measured after reference points were determined by Image Analysis program (Image-Pro® Express, Media Cybernetic, USA). Data were analyzed using Kruskal-Wallis and Mann-Whitney U-test.

The results suggest that ProFile showed significantly less canal transportation and maintained original apical foramen shape better than K³ and ProTaper.

This study was performed to verify the possibility of MTA and calcium sulfate as a pulp capping agent through comparing the dental pulp response in dogs after capping with MTA, calcium sulfate, and calcium hydroxide.

24 teeth of 2 dogs, 8 month old, were used in this study.

Under general anesthesia, cervical cavities were prepared and pulp was exposed with sterilized #2 round bur in a high speed handpiece.

MTA, calcium hydroxide, and calcium sulfate were applied on the exposed pulp. Then the coronal openings were sealed with IRM and light-cured composite.

Two months after treatment, the animals were sacrificed. The extracted teeth were fixed in 10% neutral-buffered formalin solution and were decalcified in formic acid-sodium citrate. They were prepared for histological examination in the usual manner. The sections were stained with haematoxylin and eosin.

In MTA group, a hard tissue bridges formation and newly formed odontoblasts layer was observed. There was no sign of pulp inflammatory reaction in pulp tissue.

In calcium hydroxide group, there was no odontoblast layer below the dentin bridge. In pulpal tissue, chronic inflammatory reaction with variable intensity and extension occurred in all samples.

In calcium sulfate group, newly formed odontoblast layer was observed below the bridge. Mild chronic inflammation with a few neutrophil infiltrations was observed on pulp tissue.

These results suggest that MTA is more biocompatible on pulp tissue than calcium hydroxide or calcium sulfate.

Citations

Citations to this article as recorded by  

• Effects of the exposure site on histological pulpal responses after direct capping with 2 calcium-silicate based cements in a rat model
  Panruethai Trongkij, Supachai Sutimuntanakul, Puangwan Lapthanasupkul, Chitpol Chaimanakarn, Rebecca Wong, Danuchit Banomyong
  Restorative Dentistry & Endodontics.2018;[Epub]     CrossRef
• Conservative approach of a symptomatic carious immature permanent tooth using a tricalcium silicate cement (Biodentine): a case report
  Cyril Villat, Brigitte Grosgogeat, Dominique Seux, Pierre Farge
  Restorative Dentistry & Endodontics.2013; 38(4): 258.     CrossRef
• Comparison of gene expression profiles of human dental pulp cells treated with mineral trioxide aggregate and calcium hydroxide
  Yong-Beom Kim, Won-Jun Shon, Woocheol Lee, Kee-Yeon Kum, Seung-Ho Baek, Kwang-Shik Bae
  Journal of Korean Academy of Conservative Dentistry.2011; 36(5): 397.     CrossRef
• Pulp response of beagle dog to direct pulp capping materials: Histological study
  Ji-Hyun Bae, Young-Gyun Kim, Pil-Young Yoon, Byeong-Hoon Cho, Yong-Hoon Choi
  Journal of Korean Academy of Conservative Dentistry.2010; 35(1): 5.     CrossRef
• Gene expression profiling in human dental pulp cells treated with mineral trioxide aggregate
  Yong-Beom Kim, Won-Jun Shon, WooCheol Lee, Kee-Yeon Kum, Seung-Ho Baek, Kwang-Shik Bae
  Journal of Korean Academy of Conservative Dentistry.2010; 35(3): 152.     CrossRef
• Biocompatibility of experimental mixture of mineral trioxide aggregate and glass ionomer cement
  Min-Jae Oh, Yu-Na Jeong, In-Ho Bae, So-Young Yang, Bum-Jun Park, Jeong-Tae Koh, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
  Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 359.     CrossRef
• Biocompatibility of bioaggregate cement on human pulp and periodontal ligament (PDL) derived cells
  Choo-Ryung Chung, Euiseong Kim, Su-Jung Shin
  Journal of Korean Academy of Conservative Dentistry.2010; 35(6): 473.     CrossRef
• Physical and chemical properties of experimental mixture of mineral trioxide aggregate and glass ionomer cement
  Yu-Na Jeong, So-Young Yang, Bum-Jun Park, Yeong-Joon Park, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
  Journal of Korean Academy of Conservative Dentistry.2010; 35(5): 344.     CrossRef
• The effect of several root-end filling materials on MG63 osteoblast-like cells
  Jeong-Ho Lee, Won-Jun Shon, WooCheol Lee, Seung-Ho Baek
  Journal of Korean Academy of Conservative Dentistry.2010; 35(3): 222.     CrossRef
• Effects of condensation techniques and canal sizes on the microleakage of orthograde MTA apical plug in simulated canals
  Deuk-Lim Nam, Jeong-Kil Park, Bock Hur, Hyeon-Cheol Kim
  Journal of Korean Academy of Conservative Dentistry.2009; 34(3): 208.     CrossRef
• Comparison of biocompatibility of four root perforation repair materials
  Min-Kyung Kang, In-Ho Bae, Jeong-Tae Koh, Yun-Chan Hwang, In-Nam Hwang, Won-Mann Oh
  Journal of Korean Academy of Conservative Dentistry.2009; 34(3): 192.     CrossRef
• A bioactivity study of Portland cement mixed with β-glycerophosphosphate on human pulp cell
  Young-Hwan Oh, Young-Joo Jang, Yong-Bum Cho
  Journal of Korean Academy of Conservative Dentistry.2009; 34(5): 415.     CrossRef