Residual dentin thickness of bifurcated maxillary premolars following two post space preparation methods (original) (raw)
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JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH
Introduction: The restricted access cavity and the remaining roof of the pulp chamber may change the angle at which the instrument enters the root canal, which could have an impact on the effectiveness of chemo-mechanical canal preparation, potentially leading to endodontic mishaps. Aim: To evaluate the effect of the Traditional Endodontic Cavity (TEC) and Conservative Endodontic Cavity (CEC) on the amount of Root Dentin Removal (RDR) and the related Apical Debris Extrusion (ADE) in the curved root canals prepared with ProTaper Next (PTN) and TruNatomy (TN). Materials and Methods: The in-vitro study included a total of 120 extracted human mandibular molars, separated into four groups (n=30) based on the type of endodontic cavity and file used: TEC-TN, CEC-TN, TEC-PTN, and CEC-PTN. Before biomechanical preparation, Cone Beam Computed Tomography (CBCT) scans were taken. During the preparation, apically extruded debris was collected in Eppendorf tubes. After canal preparation, a post-C...
2021
This study was to evaluate the best technique to preserve radicular dentin after performing different retreatment procedures. Twenty maxillary central incisors were cleaned and shaped with the ProTaper Next and later obturated. The dentinal thickness were then measured from the axial views in the scanned CBCT images at 0mm, 5mm, 10mm and 13mm from the root apex. The teeth were then randomly placed into four groups and different systems were employed to remove the gutta percha. These were Hedstrom file without and with xylene (Groups 1 & 2) and ProTaper Universal Retreatment files without and with xylene (Groups 3 & 4). The dentin thicknesses dimensions were then measured again on subsequent CBCT scanned axial views. Group 1 showed significant difference in the pre and post retreatment dentinal thickness at 0 and 5 mm (p< 0.05). Group 2 and 4, which were the groups with xylene showed significant difference in the dentinal thickness at 5 and 13 mm. Interestingly, Group 3 showed sig...
Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology, 2003
Objective. We sought to measure the residual dentin thickness (RDT) in the mesial roots of mandibular molars after instrumentation with Lightspeed and Gates-Glidden rotary instruments. Study design. Thirty extracted, untreated human mesial roots of mandibular molars were separated from the distal roots and embedded in clear polyester resin. The roots were cut horizontally at 1, 4, and 7 mm short of the anatomic apex. The diameter of each mesiobuccal canal was measured by using a stereo measuring microscope at each level in the buccolingual and mesiodistal directions. The dentin thickness was measured in each level in the mesial, distal, buccal, and lingual directions. Sections were reassembled with a muffle. The canals were enlarged to the working length with Lightspeed rotary instruments, of which the average size used was a No. 50 file. The coronal third was flared with No. 2 Gates-Glidden reamers. Slices were separated again, and the RDT and canal diameters were measured. Results. The minimal measured RDT after instrumentation at the 1-, 4-, and 7-mm levels was 0.70 Ϯ 0.28 mm, 1.04 Ϯ 0.18 mm, and 1.09 Ϯ 0.19 mm, respectively. The average diameter of the canals after instrumentation at the 1-, 4-, and 7-mm levels was 0.50 Ϯ 0.04 mm, 0.52 Ϯ 0.05 mm, and 0.74 Ϯ 0.08 mm, respectively. The canal diameter did not exceed one third of the root diameter at all levels. Conclusions. Root canal preparation of mandibular mesial roots with Lightspeed instruments to No. 50 in the apical third and Gates-Glidden reamers to No. 2 in the coronal third does not significantly decrease the RDT.
Influence of Cervical Preflaring on the Incidence of Root Dentin Defects
Journal of endodontics, 2017
This study evaluated the influence of cervical preflaring on the incidence of root dentin defects after root canal preparation. Extracted human maxillary central incisors were selected and allocated to 1 control group and 12 experimental groups (n = 15). Teeth in the control group were left unprepared, whereas the others were prepared using 2 reciprocating single-file systems (Reciproc and WaveOne [WO]), 3 full-sequence rotary systems (ProTaper Universal, ProTaper Next [PTN], and ProFile), and K-files driven by an oscillatory system, with and without cervical preflaring. Roots were then horizontally sectioned at 4, 8, and 12 mm from the apex, stained with 1% methylene blue, and viewed through a stereomicroscope at ×25 magnification. Slices were inspected and the absence/presence of defects (fractures, partial cracks, and craze lines) recorded. Data were analyzed using Kolmogorov-Smirnov and Levene tests followed by the Tukey post hoc test at a significance level of P < .05. No ro...
Dentistry Journal
Background: The remaining dentinal thickness is a significant factor to deal with when planning post-endodontic treatment. Aim: To assess the changes in the root canal dentinal thickness of intact and endodontically treated teeth using CBCT scans in the coronal, middle, and apical third of the root canal. Material and methods: Three hundred CBCT scans for three age groups were analyzed to study the dentinal thickness pre- and post-endodontic treatment. The dentinal thickness (DT) was measured along the buccal, mesial, distal, and lingual/palatal walls from the inner surface of the root canal to the outer surface in mm. Statistical analysis was set at 0.05. Results: The results of this study showed that the buccal, palatal, distal, and mesial dentinal thickness in intact and endodontically treated teeth is different. The differences were statistically significant when comparing the parameters of “healthy” and “treated” teeth (p < 0.05). There were no statistically significant diff...
European Journal of Dentistry, 2015
Objective: The aim of this study was to evaluate the minimum residual root thickness (MRRT) of the danger zone after preflaring of the mesio-buccal (MB) canal of mandibular first molars using ProTaper, RaCe and Gates-Glidden (GG) drills as coronal shapers by cone beam computerized tomography (CBCT). Materials and Methods: In this experimental study, the initial CBCT scans of 75 MB canals of mandibular first molars were provided within 1, 2, 3 and 4 mm of the furcation level. The samples were divided into three groups. The samples of ProTaper and RaCe groups were prepared up to F2 and #25.04 as the master apical file (MAF), respectively. The coronal preparation of the samples in the GG group was done using GG drills #2, #3 and #4 and canals were prepared till MAF # 25. After obtaining the postinstrumentation images, the MRRT and the amount of removed dentin were analyzed by t-test and ANOVA statistical analyses. Results: The GG drills removed significantly more dentin than RaCe at al...
Effects of root canal preparation on apical geometry assessed by micro-computed tomography
Journal of endodontics, 2009
Previous micro-computed tomography analyses of root canal preparation provided data that were usually averaged over canal length. The aim of this study was to compare preparation effects on apical root canal geometry. Sixty extracted maxillary molars (180 canals) used in prior studies were reevaluated for analyses of the apical 4 mm. Teeth were scanned by using micro-computed tomography before and after canal shaping with FlexMaster, GT-Rotary, Lightspeed, ProFile, ProTaper, instruments or nickel-titanium K-files for hand instrumentation. Apical preparation was to a size #40 in mesiobuccal and distobuccal and #45 in palatal canals except for GT (#20) and ProTaper (#25 in mesiobuccal and distobuccal and #30 in palatal canals, respectively). Data for canal volume changes, the structure model index (quantifying canal cross sections), and untreated surface area were contrasted by using analysis of variance and Scheffé tests. Mean mesiobuccal, distobuccal, and palatal canal volumes incre...
Morphologic criteria for root canal treatment of primary molars undergoing resorption
Dental Traumatology, 1995
criteria for root canai treatment of primary molars undergoing resorption. Endod Dent Traumatol 1995; 11: 136-141. © Munksgaard, 1995. Abstract -The endodontic anatomy of primary molars is difficult to predict because of thè balance of resorption and hard tissue deposition. In particular, thè resorption causes perforating lacunae across thè wall of thè root, even at thè furcation level, and modifies shape, dimension and position of endodontic apex. The phenomenon can be so deep as to compromise endodontic therapy. The first aim of thè study was to verify if reliable criteria can be found for treatability in primary molars undergoing resorption, i.e. if it is possible to predict if perforating lacunae are present or not. The second aim of thè study was to verify if other informations needed for endodontic treatment, as shape, dimension and location of thè apex, and curvature of thè root canai can be predicted. For thè study, 80 extracted primary molars, 75 of which pulpally involved by caries, were selected. The treatability was evaluated in term of root length, root shape, dimension and shape of endododntic apex, age of thè patient and Xray index of resorption. The association between variables was performed by multiple correspondence analysis. The results suggested that root length was thè most reliable criterion of thè integrity of thè root. The borderline of treatability was at thè length of 4 mm. The position of endodontic apex related to anatomical apex, and thè linguai related to thè buccal root length were analyzed by linear regression analysis. The canai length was often similar to thè root length (i.e. thè endo and anatomical apices were very dose) in lower and upper molars. However, in lower molars, if two or more canals were present in thè same root, a discrepancy was observed between buccal and linguai root length. This finding was Constant in first lower molars. In addition regression analysis provided a linear function between thè lengths of thè buccal and linguai side of thè same root in lower molars. Its coefficieiu b was 0.73.
Folia Medica
Introduction: The full decontamination and disinfection of the root canal system is essential for the success of regenerative endodontic procedures. The current literature does not have information regarding mechanical cleaning of immature teeth with contemporary endodontic instuments. Aim: To compare the thickness and volume of the dentin removed from the roots of immature teeth after endodontic preparation using XP-endo Finisher, GentleFile Brush and a standard H-file scraping technique through micro-computed tomography. Methods: The study included 51 immature permanent molars. Endodontic access was prepared and without performing preliminary extirpation of the pulp, the teeth were divided into three groups. The first group of teeth were instrumented for two minutes with XP-endo Finisher, the second - two minutes with Gentlefile Brush, in the third group the root canals walls were scraped with a No. 40 H-file. The thickness and the volume of the removed dentin was assessed using m...