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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Restorative Dentistry and Endodontics
Journal Basic Information
Journal DOI :
The Korean Academy of Conservative Dentistry
Editor in Chief :
Volume & Issues
Volume 36, Issue 6 - Nov 2011
Volume 36, Issue 5 - Sep 2011
Volume 36, Issue 4 - Jul 2011
Volume 36, Issue 3 - May 2011
Volume 36, Issue 2 - Mar 2011
Volume 36, Issue 1 - Jan 2011
Selecting the target year
Success and failure of endodontic microsurgery
Song, Min-Ju ; Kim, Eui-Seong ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 465~476
DOI : 10.5395/JKACD.2011.36.6.465
In current endodontic practice, introduction of operating microscope, ultrasonic instruments, and microinstruments has induced a big change in the field of surgical retreatment. In this study, we aimed to offer key steps of endodontic microsurgery procedure compared with traditional root-end surgery, and to evaluate factors influencing success and failure based on published articles. Endodontic microsurgery is a surgical procedure performed with the aid of a microscope, ultrasonic instruments and modern microsurgical instruments. The microscope provides magnification and illumination - essential for identifying minute details of the apical anatomy. Ultrasonic instruments facilitate the precise root-end preparation that is within the anatomical space of the canal. Modern endodontics can therefore be performed with precision and predictability, thus eliminating the disadvantages inherent in traditional periapical surgery such as large osteotomy, beveled apicoectomy, inaccurate root-end preparation and the inability to observe isthmus. Factors influencing the outcomes of endodontic microsurgery may be diverse, but standardization of procedures can minimize its range. Among patient and tooth-related factors, periodontal status and tooth position are known to be prognostic, but there are only few articles concerning this matter. High-evidence randomized clinical trials or prospective cohort studies are needed to confirm these findings.
Microshear bond strength of a self-etching primer adhesive to enamel according to the type of bur
Jeong, Jin-Ho ; Cho, Young-Gon ; Lee, Myung-Seon ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 477~482
DOI : 10.5395/JKACD.2011.36.6.477
Objectives: The purpose of this study was to compare the microshear bond strength (uSBS) to enamel prepared with different burs and to determine what type of bur were chosen when a self-etching primer adhesive was used. Materials and Methods: Enamel of forty-two human molars were used. They were divided into one of six groups (n = 7), Group 1, coarse (125 - 150
) diamond bur; Group 2, standard (106 - 125
) diamond bur; Group 3, fine (53 - 63
) diamond bur; Group 4, extrafine (20 - 30
) diamond bur; Group 5, plaincut carbide bur (no. 245); Group 6, cross-cut carbide bur (no. 557). Clearfil SE Bond and Clearfil AP-X (Kuraray Medical Inc.) was bonded to enamel surface. The bonded specimens were subjected to uSBS testing. Results: The uSBS of Group 4 was the highest among groups and it was significantly higher than that of Groups 1, 2, 3, and 6 (p < 0.05), but it was not significantly different from that of Group 5. Conclusions: Different burs used on enamel surface affected the microshear bond strengths of a self-etching primer adhesive to the enamel surface. In the case of Clearfil SE Bond, extrafine diamond and plain-cut carbide bur are recommended for bonding to enamel.
Effect of glycerin on the surface hardness of composites after curing
Park, Hyun-Hee ; Lee, In-Bog ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 483~489
DOI : 10.5395/JKACD.2011.36.6.483
Objectives: The purpose of this study was to examine the effect of glycerin topical application on the surface hardness of composite after curing. Materials and Methods: A composite (Z-250, 3M ESPE) was packed into a disc-shaped brass mold and light cured according to one of the following protocols. Group 1 (control) was exposed to air and light cured for 40 sec, group 2 was covered with a Mylar strip and light cured for 40 sec, group 3 was surface coated with glycerin and light cured for 40 sec, and group 4 was exposed to air and light cured for 20 sec and then surface coated with glycerin and cured for additional 20 sec. Twenty specimens were prepared for each group. The surface hardnesses of specimens were measured with or without polishing. Five days later, the surface hardness of each specimen was measured again. Data were analyzed by three-way ANOVA and Tukey's post hoc tests. Results: The surface hardnesses of the unpolished specimens immediately after curing decreased in the following order: group 2 > 3 > 4 > 1. For the polished specimens, there was no significant difference among the groups. Within the same group, the hardness measured after five days was increased compared to that immediately after curing, and the polished specimens showed greater hardness than did the unpolished specimens. Conclusions: The most effective way to increase the surface hardness of composite is polishing after curing. The uses of a Mylar strip or glycerin topical application before curing is recommended.
Bonding efficacy of cured or uncured dentin adhesives in indirect resin
Jang, Ji-Hyun ; Lee, Bin-Na ; Chang, Hoon-Sang ; Hwang, Yun-Chan ; Oh, Won-Mann ; Hwang, In-Nam ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 490~497
DOI : 10.5395/JKACD.2011.36.6.490
Objectives: This study examined the effect of the uncured dentin adhesives on the bond interface between the resin inlay and dentin. Materials and Methods: Dentin surface was exposed in 24 extracted human molars and the teeth were assigned to indirect and direct resin restoration group. For indirect resin groups, exposed dentin surfaces were temporized with provisional resin. The provisional restoration was removed after 1 wk and the teeth were divided further into 4 groups which used dentin adhesives (OptiBond FL, Kerr; One-Step, Bisco) with or without light-curing, respectively (Group OB-C, OB-NC, OS-C and OS-NC). Pre-fabricated resin blocks were cemented on the entire surfaces with resin cement. For the direct resin restoration groups, the dentin surfaces were treated with dentin adhesives (Group OB-D and OS-D), followed by restoring composite resin. After 24 hr, the teeth were assigned to microtensile bond strength (
) and confocal laser scanning microscopy (CLSM), respectively. Results: The indirect resin restoration groups showed a lower
than the direct resin restoration groups. The
values of the light cured dentin adhesive groups were higher than those of the uncured dentin adhesive groups (p < 0.05). CLSM analysis of the light cured dentin adhesive groups revealed definite and homogenous hybrid layers. However, the uncured dentin adhesive groups showed uncertain or even no hybrid layer. Conclusions: Light-curing of the dentin adhesive prior to the application of the cementing material in luting a resin inlay to dentin resulted in definite, homogenous hybrid layer formation, which may improve the bond strength.
Microbial profile of asymptomatic and symptomatic teeth with primary endodontic infections by pyrosequencing
Lim, Sang-Min ; Lee, Tae-Kwon ; Kim, Eun-Jeong ; Park, Jun-Hong ; Lee, Yoon ; Bae, Kwang-Shik ; Kum, Kee-Yeon ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 498~505
DOI : 10.5395/JKACD.2011.36.6.498
Objectives: The purpose of this in vivo study was to investigate the microbial diversity in symptomatic and asymptomatic canals with primary endodontic infections by using GS FLX Titanium pyrosequencing. Materials and Methods: Sequencing was performed on 6 teeth (symptomatic, n = 3; asymptomatic, n = 3) with primary endodontic infections. Amplicons from hypervariable region of the small-subunit ribosomal RNA gene were generated by polymerized chain reaction (PCR), and sequenced by means of the GS FLX Titanium pyrosequencing. Results: On average, 10,639 and 45,455 16S rRNA sequences for asymptomatic and symptomatic teeth were obtained, respectively. Based on Ribosomal Database Project Classifier analysis, pyrosequencing identified the 141 bacterial genera in 13 phyla. The vast majority of sequences belonged to one of the seven phyla: Actinobacteria, Bacteroidetes, Firmicutes, Fusobacteria, Proteobacteria, Spirochetes, and Synergistetes. In genus level, Pyramidobacter, Streptococcus, and Leptotrichia constituted about 50% of microbial profile in asymptomatic teeth, whereas Neisseria, Propionibacterium, and Tessaracoccus were frequently found in symptomatic teeth (69%). Grouping the sequences in operational taxonomic units (3%) yielded 450 and 1,997 species level phylotypes in asymptomatic and symptomatic teeth, respectively. The total bacteria counts were significantly higher in symptomatic teeth than that of asymptomatic teeth (p < 0.05). Conclusions: GS FLX Titanium pyrosequencing could reveal a previously unidentified high bacterial diversity in primary endodontic infections.
Subcutaneous emphysema during fracture line inspection: case report
Kim, Min-Young ; Park, Sung-Ho ; Shin, Yoo-Seok ; Kim, Eui-Seong ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 506~509
DOI : 10.5395/JKACD.2011.36.6.506
The development of subcutaneous emphysema is a well-known complication that has been reported after dental extraction, endodontic treatment, or restorative preparation. Gaseous invasion, leading to swelling, crepitus on palpation, is commonly restricted to the connective tisssues immediately adjacent to the entry site. However, the use of compressed air- and water-cooled turbines may allow large amounts of air and water to be driven through the fascial planes into the mediastinum, pleural space, or even the retroperitoneum. This case report is about the patient who presented with subcutaneous emphysema that occurred after fracture line inspection. Possible cause, treatment, and prevention of emphysema will be discussed.
Failure of orthograde MTA filling: MTA wash-out?
Kim, Yu-Ran ; Lee, Chan-Young ; Kim, Eui-Seoung ; Jung, Il-Young ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 510~514
DOI : 10.5395/JKACD.2011.36.6.510
Mineral trioxide aggregate (MTA), which was originally developed for repair of root perforations, is a biocompatible material with numerous clinical applications in endodontics. MTA must be allowed to set in the presence of moisture to optimize the material's physical and chemical properties. In the clinic, occasionally unset MTA has been detected after application of MTA on the tooth, and the reason has been unclear. This case report presents MTA washed-out for several years after placement at the root apex as an apical plug, and discusses the reason and things to consider in clinics.
Diastema closure with direct composite: architectural gingival contouring
Kim, Yeon-Hwa ; Cho, Yong-Bum ;
Restorative Dentistry and Endodontics, volume 36, issue 6, 2011, Pages 515~520
DOI : 10.5395/JKACD.2011.36.6.515
One of the most challenging task in closing anterior diastema is avoiding "black triangle" between the teeth. This paper reports a case that the closure of diastema in anterior teeth could be successfully accomplished using direct adhesive restorations and gingival recontouring. The traditional technique using Mylar strip was modified to increase the emergence profile with natural contours at the gingival-tooth interface. Mylar strip was extended out of the sulcus by approximately 1 mm high from the gingival margin, and a small cotton pellet was used to provide the emergence contour. This modified approach is acceptable for the clinical situation.