Temperature‐dependent rheological property changes of thermoplastic gutta‐percha root filling materials

Moon, Hyun-Joo; Lee, J. H.; Ahn, Jungkyu; Song, Ho Jun; Park, Kyung Hee

doi:10.1111/iej.12349

Cited by 9 publications

(7 citation statements)

References 20 publications

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“…Considering that the quality of endodontic obturations may be influenced by the enlargement of root canals (7), the greatest enlargement may have contributed for inserted up to 3mm of the working length in the continuous wave of condensation technique. Besides that, the gutta-percha used for thermocompaction may affect the results (30). The warmed gutta-percha may undergo volumetric changes with heating (3,21).…”

Section: Discussionmentioning

confidence: 99%

Continuous Wave of Condensation Improves the Filling of Curved Canals: a Micro-CT Study

Pinto

Pivoto-João²,

Guerreiro-Tanomaru³

et al. 2023

Odovtos - Int J Dent Sc

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The aim of this study was to compare the filling capacity in curved root canal using a new continuous wave of condensation technique (Termo Pack II, Easy Dental Equipments, Brazil) or lateral compaction. The percentage of voids in the filling of mesial root canals of mandibular molars was assessed by micro-computed tomography (micro-CT). Mesial root canals (n=24) of mandibular molars with a degree of curvature between 20° and 40° were prepared using rotary system (ProDesign Logic, Easy, Brazil) up to #35, .05 taper. The root canals were filled by using the continuous wave of condensation system or lateral compaction and AH Plus sealer (n=12). Scanning at 9 µm was performed after preparation and after filling by using micro-CT SkyScan 1176. The volumetric percentage of filling material and voids (total length and in each root canal third) were calculated. Data were analyzed using ANOVA/Tukey and Student’s t tests (α=0.05). Before the filling techniques, the root canals volume after preparation was similar (p>0.05). The root canals filled by the continuous wave of condensation technique presented the lowest percentage of voids, and the greatest percentage of filling material in total length and thirds (cervical, middle and apical) (p<0.05). Both techniques were not able of completely filling the root canals. The continuous wave of condensation technique Termo Pack II promoted better root canal filling in curved root canals, when compared with lateral compaction.

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Section: Discussionmentioning

confidence: 99%

Continuous Wave of Condensation Improves the Filling of Curved Canals: a Micro-CT Study

Pinto

Pivoto-João²,

Guerreiro-Tanomaru³

et al. 2023

Odovtos - Int J Dent Sc

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“…This high dimensional variability of the gutta-percha cones is mainly caused by their high plasticity, which means that despite the standardization of the manufacturing process, deformations caused by the thermal changes to which they may be subjected during transport and storage can occur. ( 22 ).…”

Section: Discussionmentioning

confidence: 99%

Diameter and taper variability of gutta-percha cones adapted to TruNatomyTM and RotateTM rotary file systems

Martínez¹,

Lozano²,

Sanz³

et al. 2023

J Clin Exp Dent

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Background Evaluate the discrepancy in diameter and taper between adapted gutta-percha cones for TruNatomyTM 26.04 (TRU04), RotateTM 25.04 (ROT04) and 25.06 (ROT06) systems and their reference files. Material and Methods A sample of 60 gutta-percha cones and 15 rotary files was selected and divided into three groups (TRU04, ROT04, ROT06). Each group consisted of 20 cones and 5 corresponding files. They were observed under an optical microscope at x20 magnification and images of all observations were obtained. Diameters were measured with a digital ruler calibrated at 3 levels: D1, D3, D16 (mm from tip). The taper of each system of cones and files was calculated, The percentage of discrepancy between the taper of each file system and its corresponding gutta-percha cone was calculated. Results The percentage of discrepancy between the diameter of the tested gutta-percha cones and their corresponding files varied from -7% to 21%. The smallest dimensional discrepancy between gutta-percha cone and corresponding file was found at D16 in TRU04 group. The tapers of the gutta-percha cones vs their respective files were: 2% vs 3% (TRU04), 4% vs 5% (ROT04), and 6% vs 5% (ROT06). The highest discrepancy was observed at D16 in ROT06 group. The global taper discrepancy between gutta-percha cone and its corresponding file was negative in TRU04 and ROT04 groups. Conclusions The taper and the diameter at D1, D3, and D16 differed between all of the tested gutta-percha cones and their corresponding files. TruNatomy 26.04 files and its adapted gutta-percha cones exhibited the least discrepancy. Key words: Corresponding gutta-percha, rotary file, taper, TruNatomy, Rotate, standardization.

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“…This variability of GP cones such as shrinkage and expansion might be caused due to it's high plasticity during transportation, storage but to there seems to be a lack of information regarding the influence of environmental changes on the. GP cones [12,14,15]. There are also concerns about fit of GP along the entire length of root canal from apical to coronal third as any discrepancy can lead to leakage.…”

Section: Discussionmentioning

confidence: 99%

Comparison of variability in diameter and taper of gutta percha cones of diﬀerent brands using Stereomicroscopy and Digital Micrometer

Mishra¹,

Magwa²,

Agarwal³

et al. 2021

Èndodontiâ today

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Aim: Variations in cone tip diameter while obturation can lead to premature binding, extrusion, or poor adaptability of GP to the canal walls and promotes microleakage and ultimately endodontic failure. The purpose of this investigation was to measure the variability from the listed cone tip diameter and taper of size #25, 0.06 taper GP cones from three different brands with the help of stereomicroscope and digital micrometer.Materials and methods: 45 GP points (N = 45) of Size #25 with an 0.06 taper from three different brands were divided into three groups: Group A – Diadent Group B – K3 and Group C Pro- Taper Next. Each group have 15 GP (n = 15). The diameters (D0 and D3), tapers were measured according to the ANSI/ADA Specification No. 78 using stereomicroscope (accuracy of 0.001mm) and digital micrometer. Kruskall Wallis test was to detect any significant differences between two or more groups and Mann Whitney U test for pairwise comparison. p value < 0.05 were considered as statistically significant.Results: On comparing there was significant variability within the three brands using stereomicroscopy, the standard values for D0 diameter which was 0.25 ± 0.23, Protaper Next GP cones was the similar to the standardized values compared to Diadent and K3 GP cones which were significantly different from the standard values. On comparing diameter variation at D3, Protaper Next, 0.043 ± 0.018 was once again similar to its manufacturer standard values of 0.43 ± 0.022. Diadent showed mild variation with D3 Diameter of 0.44 ± 0.017 and K3 was significantly different from the standard values K3 was 0.41 ± 0.018.Conclusions: The results of the current study indicate significant variability between GP cone brands for both diameter and taper. However, the high standard deviation values associated with most of the diameter and taper differences from manufacturer’s nominal values also suggests high variability within individual brands.

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Temperature‐dependent rheological property changes of thermoplastic gutta‐percha root filling materials

Abstract: The PR values were changed by both the heating temperature and the brand or type of GP materials tested. Each material was associated with drastic decreases before reaching 60 °C in different degrees, and Obtura had the highest PR at most of the measured temperatures.

Cited by 9 publications

References 20 publications

Continuous Wave of Condensation Improves the Filling of Curved Canals: a Micro-CT Study

Continuous Wave of Condensation Improves the Filling of Curved Canals: a Micro-CT Study

Diameter and taper variability of gutta-percha cones adapted to TruNatomyTM and RotateTM rotary file systems

Comparison of variability in diameter and taper of gutta percha cones of diﬀerent brands using Stereomicroscopy and Digital Micrometer

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