9 results on '"instrumentation length"'
Search Results
2. Comparative Analysis of Crack Propagation in Roots with Hand and Rotary Instrumentation of the Root Canal -An Ex-vivo Study
- Author
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Manju Raj Kumari and Manjunath Mysore Krishna Swamy
- Subjects
apical root crack ,instrumentation length ,protaper next ,protaper universal ,root canal instrumentation ,stainless steel k file ,Medicine - Abstract
Introduction: Success of any endodontic treatment depends on strict adherence to ‘endodontic triad’. Preparation of root canal system is recognized as being one of the most important stages in root canal treatment. At times, we inevitably end up damaging root dentin which becomes a Gateway for infections like perforation, zipping, dentinal cracks and minute intricate fractures or even vertical root fractures, thereby resulting in failure of treatment. Several factors may be responsible for the formation of dentinal cracks like high concentration of sodium hypochlorite, compaction methods and various canal shaping methods. Aim: To compare and evaluate the effects of root canal preparation techniques and instrumentation length on the development of apical root cracks. Materials and Methods: Seventy extracted premolars with straight roots were mounted on resin blocks with simulated periodontal ligaments, exposing 1-2 mm of the apex followed by sectioning of 1mm of root tip for better visualization under stereomicroscope. The teeth were divided into seven groups of 10 teeth each – a control group and six experimental groups. Subgroup A & B were instrumented with: Stainless Steel hand files (SS) up to Root Canal Length (RCL) & (RCL –1 mm) respectively; sub group C & D were instrumented using ProTaper Universal (PTU) up to RCL and (RCL -1mm) respectively; subgroup E & F were instrumented using ProTaper Next (PTN) up to RCL & (RCL -1 mm) respectively. Stereomicroscopic images of the instrumentation sequence were compared for each tooth. The data was analyzed statistically using descriptive analysis by ‘Phi’ and ‘Cramers’ test to find out statistical significance between the groups. The level of significance was set at p< 0.05 using SPSS software. Results: Stainless steel hand file group showed most cracks followed by ProTaper Universal & ProTaper Next though statistically not significant. Samples instrumented up to 1mm short of working length (RCL-1mm) showed lesser number of cracks. Conclusion: All groups showed cracks formation, the stainless steel group being the highest. Working 1mm short of apex reduces the incidence of crack formation.
- Published
- 2016
- Full Text
- View/download PDF
3. Comparative Analysis of Crack Propagation in Roots with Hand and Rotary Instrumentation of the Root Canal -An Ex-vivo Study.
- Author
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KUMARI, MANJU RAJ and KRISHNASWAMY, MANJUNATH MYSORE
- Subjects
- *
ENDODONTICS , *DENTAL pulp cavities , *DENTIN , *THERAPEUTICS - Abstract
Introduction: Success of any endodontic treatment depends on strict adherence to 'endodontic triad'. Preparation of root canal system is recognized as being one of the most important stages in root canal treatment. At times, we inevitably end up damaging root dentin which becomes a Gateway for infections like perforation, zipping, dentinal cracks and minute intricate fractures or even vertical root fractures, thereby resulting in failure of treatment. Several factors may be responsible for the formation of dentinal cracks like high concentration of sodium hypochlorite, compaction methods and various canal shaping methods. Aim: To compare and evaluate the effects of root canal preparation techniques and instrumentation length on the development of apical root cracks. materials and methods: Seventy extracted premolars with straight roots were mounted on resin blocks with simulated periodontal ligaments, exposing 1-2 mm of the apex followed by sectioning of 1mm of root tip for better visualization under stereomicroscope. The teeth were divided into seven groups of 10 teeth each -- a control group and six experimental groups. Subgroup A & B were instrumented with: Stainless Steel hand files (SS) up to Root Canal Length (RCL) & (RCL -1 mm) respectively; sub group C & D were instrumented using ProTaper Universal (PTU) up to RCL and (RCL -1mm) respectively; subgroup E & F were instrumented using ProTaper Next (PTN) up to RCL & (RCL -1 mm) respectively. Stereomicroscopic images of the instrumentation sequence were compared for each tooth. The data was analyzed statistically using descriptive analysis by 'Phi' and 'Cramers' test to find out statistical significance between the groups. The level of significance was set at p< 0.05 using SPSS software. results: Stainless steel hand file group showed most cracks followed by ProTaper Universal & ProTaper Next though statistically not significant. Samples instrumented up to 1mm short of working length (RCL-1mm) showed lesser number of cracks. conclusion: All groups showed cracks formation, the stainless steel group being the highest. Working 1mm short of apex reduces the incidence of crack formation. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
4. Incidence of Apical Root Cracks and Apical Dentinal Detachments after Canal Preparation with Hand and Rotary Files at Different Instrumentation Lengths.
- Author
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Liu, Rui, Kaiwar, Anjali, Shemesh, Hagay, Wesselink, Paul R., Hou, Benxiang, and Wu, Min-Kai
- Subjects
TEETH abnormalities ,DENTAL pulp cavities ,DENTAL equipment ,INCISORS ,DENTAL metallurgy ,DIGITAL images ,LOGISTIC regression analysis - Abstract
Abstract: Introduction: The aim of this study was to compare the incidence of apical root cracks and dentinal detachments after canal preparation with hand and rotary files at different instrumentation lengths. Methods: Two hundred forty mandibular incisors were mounted in resin blocks with simulated periodontal ligaments, and the apex was exposed. The root canals were instrumented with rotary and hand files, namely K3, ProTaper, and nickel-titanium Flex K files to the major apical foramen (AF), short AF, or beyond AF. Digital images of the apical surface of every tooth were taken during the apical enlargement at each file change. Development of dentinal defects was determined by comparing these images with the baseline image. Multinomial logistic regression test was performed to identify influencing factors. Results: Apical crack developed in 1 of 80 teeth (1.3%) with hand files and 31 of 160 teeth (19.4%) with rotary files. Apical dentinal detachment developed in 2 of 80 teeth (2.5%) with hand files and 35 of 160 teeth (21.9%) with rotary files. Instrumentation with rotary files terminated 2 mm short of AF and did not cause any cracks. Significantly less cracks and detachments occurred when instrumentation with rotary files was terminated short of AF, as compared with that terminated at or beyond AF (P < .05). The AF deviated from the anatomic apex in 128 of 240 teeth (53%). Significantly more apical dentinal detachments appeared in teeth with a deviated AF (P = .033). Conclusions: Rotary instruments caused more dentinal defects than hand instruments; instrumentation short of AF reduced the risk of dentinal defects. [Copyright &y& Elsevier]
- Published
- 2013
- Full Text
- View/download PDF
5. Posterior surgery in high-grade spondylolisthesis
- Author
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Y.P. Charles, J.-P. Steib, Sébastien Schuller, A. Walter, R. Lengert, and Julien Godet
- Subjects
Adult ,Male ,medicine.medical_specialty ,Sacrum ,Lordosis ,Adolescent ,medicine.medical_treatment ,Bone Screws ,Young Adult ,medicine ,Segmental lordosis ,Humans ,Orthopedics and Sports Medicine ,Instrumentation length ,Reduction (orthopedic surgery) ,Balance (ability) ,Lumbosacral fusion ,Retrospective Studies ,Lumbar Vertebrae ,business.industry ,High grade spondylolisthesis ,medicine.disease ,Low back pain ,Sagittal plane ,Spondylolisthesis ,Surgery ,Radiography ,medicine.anatomical_structure ,Spinal Fusion ,Fibula ,Female ,medicine.symptom ,Slippage parameters ,business ,Lumbosacral joint ,Sagittal balance ,High-grade spondylolisthesis ,Follow-Up Studies - Abstract
Introduction High-grade L5-S1 spondylolisthesis alters sagittal spinopelvic balance, which can cause low back pain and progressive neurologic disorder. The present study assessed spondylolisthesis reduction and maintenance over time with L4-S1 versus L5-S1 fusion using a lever-arm system and posterior fusion combined with lumbosacral graft. Materials and methods Forty patients were operated on for symptomatic high-grade spondylolisthesis, 34 of whom had full pre- and post-operative radiological analysis, with a mean follow-up of 5.4 years. There were 9 L5-S1 and 25 L4-S1 instrumentations. Analysis of spinopelvic and slipping parameters and the evolution of segmental lordosis compared results between L5-S1 and L4-S1 instrumentation. Results Mean Taillard spondylolisthesis index decreased from 64% to 37% (P = 0.0001). Overall sagittal spinopelvic balance was not significantly changed. Overall L1-S1 and segmental L4-L5 lordosis were not affected by instrumentation. Mean L5-S1 segmental lordosis increased from 11° to 18°. There was loss of reduction from 19° to 14° with L5-S1 instrumentation, in contrast to maintained reduction with L4-S1 instrumentation (P = 0.006). Conclusion The lever-arm system provided anterior-posterior reduction of spondylolisthesis and corrected slippage. Postoperative change in overall sagittal spinopelvic balance was slight and constant. Posterior L4-S1 fusion provided better long-term control of L5-S1 lordosis reduction than the shorter L5-S1 fusion. Retrospective study of level IV.
- Published
- 2014
- Full Text
- View/download PDF
6. Comparative analysis of apical root crack propagation after root canal preparation at different instrumentation lengths using protaper universal, protaper next and protaper gold rotary files: An In vitro study
- Author
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G B Shivamurthy and Sonalkumari Vakilram Nishad
- Subjects
Materials science ,Instrumentation ,Root canal ,0206 medical engineering ,Orthodontics ,02 engineering and technology ,Root canal length ,Root tip ,Root apex ,03 medical and health sciences ,0302 clinical medicine ,Root crack ,ProTaper Gold ,medicine ,In vitro study ,ProTaper Next ,ProTaper Universal ,Significant difference ,030206 dentistry ,020601 biomedical engineering ,medicine.anatomical_structure ,Apical root crack ,instrumentation length ,Periodontics ,Original Article ,Oral Surgery - Abstract
Aim: To compare the incidence of apical root crack formation after root canal preparation at different instrumentation lengths using ProTaper Universal (PTU), ProTaper Next (PTN) and ProTaper Gold (PTG) file systems. Subjects and Methods: Eighty-four mandibular first premolars with single and straight root canal were mounted in resin block after simulating periodontal ligaments. 1–2 mm of root apex was exposed followed by sectioning of 1 mm of root tip for better stereomicroscopic visualization. While the Control group was left unprepared, experimental groups were instrumented up to root canal length (RCL) and (RCL-1 mm) respectively using PTU, PTN and PTG. After staining the root apex with 1% methylene blue dye, stereomicroscopic images were obtained for evaluating apical root cracks. The data were analyzed using Chi-square, phi and Cramer test. The significance level was set at P < 0.05. Results: Significantly less dentinal defects were seen between PTG and PTU while there was no significant difference between PTU-PTN and PTN-PTG. Furthermore, samples instrumented up to RCL-1 mm showed lesser cracks as compared with samples instrumented up to RCL. Conclusion: PTG produced least number of cracks followed by PTN and PTU. Furthermore, instrumenting short of RCL reduced the crack formation risk.
- Published
- 2018
7. Comparative Analysis of Crack Propagation in Roots with Hand and Rotary Instrumentation of the Root Canal -An Ex-vivo Study
- Author
-
Manju Raj Kumari and Manjunath Mysore Krishnaswamy
- Subjects
Root canal ,Clinical Biochemistry ,Perforation (oil well) ,lcsh:Medicine ,Dentistry ,Root tip ,stainless steel k file ,030207 dermatology & venereal diseases ,03 medical and health sciences ,0302 clinical medicine ,Stereo microscope ,medicine ,apical root crack ,protaper universal ,High concentration ,protaper next ,business.industry ,lcsh:R ,Fracture mechanics ,030206 dentistry ,General Medicine ,Dentistry Section ,Apex (geometry) ,medicine.anatomical_structure ,instrumentation length ,Rotary instrumentation ,business ,root canal instrumentation - Abstract
Introduction: Success of any endodontic treatment depends on strict adherence to ‘endodontic triad’. Preparation of root canal system is recognized as being one of the most important stages in root canal treatment. At times, we inevitably end up damaging root dentin which becomes a Gateway for infections like perforation, zipping, dentinal cracks and minute intricate fractures or even vertical root fractures, thereby resulting in failure of treatment. Several factors may be responsible for the formation of dentinal cracks like high concentration of sodium hypochlorite, compaction methods and various canal shaping methods. Aim: To compare and evaluate the effects of root canal preparation techniques and instrumentation length on the development of apical root cracks. Materials and Methods: Seventy extracted premolars with straight roots were mounted on resin blocks with simulated periodontal ligaments, exposing 1-2 mm of the apex followed by sectioning of 1mm of root tip for better visualization under stereomicroscope. The teeth were divided into seven groups of 10 teeth each – a control group and six experimental groups. Subgroup A & B were instrumented with: Stainless Steel hand files (SS) up to Root Canal Length (RCL) & (RCL –1 mm) respectively; sub group C & D were instrumented using ProTaper Universal (PTU) up to RCL and (RCL -1mm) respectively; subgroup E & F were instrumented using ProTaper Next (PTN) up to RCL & (RCL -1 mm) respectively. Stereomicroscopic images of the instrumentation sequence were compared for each tooth. The data was analyzed statistically using descriptive analysis by ‘Phi’ and ‘Cramers’ test to find out statistical significance between the groups. The level of significance was set at p< 0.05 using SPSS software. Results: Stainless steel hand file group showed most cracks followed by ProTaper Universal & ProTaper Next though statistically not significant. Samples instrumented up to 1mm short of working length (RCL-1mm) showed lesser number of cracks. Conclusion: All groups showed cracks formation, the stainless steel group being the highest. Working 1mm short of apex reduces the incidence of crack formation.
- Published
- 2015
8. Cement augmentation versus extended dorsal instrumentation in the treatment of osteoporotic vertebral fractures: a biomechanical comparison.
- Author
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Weiser L, Dreimann M, Huber G, Sellenschloh K, Püschel K, Morlock MM, Rueger JM, and Lehmann W
- Subjects
- Aged, Biomechanical Phenomena, Bone Screws, Cadaver, Cementation methods, Female, Fractures, Stress diagnostic imaging, Fractures, Stress surgery, Humans, Joint Instability diagnostic imaging, Joint Instability prevention & control, Male, Osteoporotic Fractures diagnostic imaging, Prosthesis Failure, Random Allocation, Spinal Fractures diagnostic imaging, Tomography, X-Ray Computed, Bone Cements therapeutic use, Osteoporotic Fractures surgery, Spinal Fractures surgery
- Abstract
Aims: Loosening of pedicle screws is a major complication of posterior spinal stabilisation, especially in the osteoporotic spine. Our aim was to evaluate the effect of cement augmentation compared with extended dorsal instrumentation on the stability of posterior spinal fixation., Materials and Methods: A total of 12 osteoporotic human cadaveric spines (T11-L3) were randomised by bone mineral density into two groups and instrumented with pedicle screws: group I (SHORT) separated T12 or L2 and group II (EXTENDED) specimen consisting of T11/12 to L2/3. Screws were augmented with cement unilaterally in each vertebra. Fatigue testing was performed using a cranial-caudal sinusoidal, cyclic (1.0 Hz) load with stepwise increasing peak force., Results: Augmentation showed no significant increase in the mean cycles to failure and fatigue force (SHORT p = 0.067; EXTENDED p = 0.239). Extending the instrumentation resulted in a significantly increased number of cycles to failure and a significantly higher fatigue force compared with the SHORT instrumentation (EXTENDED non-augmented + 76%, p < 0.001; EXTENDED augmented + 87%, p < 0.001)., Conclusion: The stabilising effect of cement augmentation of pedicle screws might not be as beneficial as expected from biomechanical pull-out tests. Lengthening the dorsal instrumentation results in a much higher increase of stability during fatigue testing in the osteoporotic spine compared with cement augmentation. Cite this article: Bone Joint J 2016;98-B:1099-1105., (©2016 The British Editorial Society of Bone & Joint Surgery.)
- Published
- 2016
- Full Text
- View/download PDF
9. Posterior surgery in high-grade spondylolisthesis.
- Author
-
Lengert R, Charles YP, Walter A, Schuller S, Godet J, and Steib JP
- Subjects
- Adolescent, Adult, Bone Screws, Female, Fibula transplantation, Follow-Up Studies, Humans, Lordosis diagnostic imaging, Lordosis surgery, Lumbar Vertebrae diagnostic imaging, Male, Radiography, Retrospective Studies, Sacrum diagnostic imaging, Spondylolisthesis diagnostic imaging, Young Adult, Lumbar Vertebrae surgery, Sacrum surgery, Spinal Fusion, Spondylolisthesis surgery
- Abstract
Introduction: High-grade L5-S1 spondylolisthesis alters sagittal spinopelvic balance, which can cause low back pain and progressive neurologic disorder. The present study assessed spondylolisthesis reduction and maintenance over time with L4-S1 versus L5-S1 fusion using a lever-arm system and posterior fusion combined with lumbosacral graft., Materials and Methods: Forty patients were operated on for symptomatic high-grade spondylolisthesis, 34 of whom had full pre- and post-operative radiological analysis, with a mean follow-up of 5.4years. There were 9 L5-S1 and 25 L4-S1 instrumentations. Analysis of spinopelvic and slipping parameters and the evolution of segmental lordosis compared results between L5-S1 and L4-S1 instrumentation., Results: Mean Taillard spondylolisthesis index decreased from 64% to 37% (P=0.0001). Overall sagittal spinopelvic balance was not significantly changed. Overall L1-S1 and segmental L4-L5 lordosis were not affected by instrumentation. Mean L5-S1 segmental lordosis increased from 11° to 18°. There was loss of reduction from 19° to 14° with L5-S1 instrumentation, in contrast to maintained reduction with L4-S1 instrumentation (P=0.006)., Conclusion: The lever-arm system provided anterior-posterior reduction of spondylolisthesis and corrected slippage. Postoperative change in overall sagittal spinopelvic balance was slight and constant. Posterior L4-S1 fusion provided better long-term control of L5-S1 lordosis reduction than the shorter L5-S1 fusion. Retrospective study of level IV., (Copyright © 2014 Elsevier Masson SAS. All rights reserved.)
- Published
- 2014
- Full Text
- View/download PDF
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