Influence of Cutting Aspect on Continuous Use of Ni-Ti Orifice Opener
Purpose: Ni-Ti orifice openers were designed to prepare the coronal and middle third of canals. The purpose of this study was to compare the generated cutting torque after 10 continuous uses at two rotational speeds. Methods: EndoWave .08 Ni-Ti rotary instruments (EW; J. Morita) and standardized st...
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| Published in | The Japanese Journal of Conservative Dentistry Vol. 57; no. 1; pp. 58 - 66 |
|---|---|
| Main Authors | , , |
| Format | Journal Article |
| Language | Japanese |
| Published |
The Japanese Society of Conservative Dentistry
2014
特定非営利活動法人 日本歯科保存学会 |
| Subjects | |
| Online Access | Get full text |
| ISSN | 0387-2343 2188-0808 |
| DOI | 10.11471/shikahozon.57.58 |
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| Abstract | Purpose: Ni-Ti orifice openers were designed to prepare the coronal and middle third of canals. The purpose of this study was to compare the generated cutting torque after 10 continuous uses at two rotational speeds. Methods: EndoWave .08 Ni-Ti rotary instruments (EW; J. Morita) and standardized straight root canal models were used in this study. The root canal model made of resin, which has a cut feeling similar to that of dentin, was used. A computer controlled torque testing device was used for this experiment. Instruments were inserted to a depth of 8 mm into the root canal. The rotational speed was fixed at 300 rpm and 600 rpm, respectively. The insertion speed into the root canal was set at 0.01 mm/sec. The torque generated under each experimental condition was recorded. The cutting blade was cleaned with a toothbrush after each use and was subjected to ultrasonic cleaning for five minutes. The same cutting procedure was repeated 10 times. Five root canal models were used for each experimental condition. The cutting efficacy was analyzed based on the torque-insertion distance and the variation in torque (ΔT) was calculated. The file was observed morphologically after the final cutting. Results: The torque generated in root canal orifice enlargement was found to increase as the instrument was inserted further into the root canal. As shown by the torque-insertion distance curve of EW, the cutting torque increased with the number of cutting times. At both rotational speeds, ΔT tended to increase and cutting efficiency tended to decrease as the cutting time was increased. From observations of the cross section of the cutting part, wear was observed in the cutting edge after the final cutting, and this wear indicates increased ΔT. Conclusion: These results suggested that prolonged use of EW .08 taper Ni-Ti rotary instruments significantly reduces their cutting efficiency. |
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| AbstractList | Purpose: Ni-Ti orifice openers were designed to prepare the coronal and middle third of canals. The purpose of this study was to compare the generated cutting torque after 10 continuous uses at two rotational speeds. Methods: EndoWave .08 Ni-Ti rotary instruments (EW; J. Morita) and standardized straight root canal models were used in this study. The root canal model made of resin, which has a cut feeling similar to that of dentin, was used. A computer controlled torque testing device was used for this experiment. Instruments were inserted to a depth of 8 mm into the root canal. The rotational speed was fixed at 300 rpm and 600 rpm, respectively. The insertion speed into the root canal was set at 0.01 mm/sec. The torque generated under each experimental condition was recorded. The cutting blade was cleaned with a toothbrush after each use and was subjected to ultrasonic cleaning for five minutes. The same cutting procedure was repeated 10 times. Five root canal models were used for each experimental condition. The cutting efficacy was analyzed based on the torque-insertion distance and the variation in torque (ΔT) was calculated. The file was observed morphologically after the final cutting. Results: The torque generated in root canal orifice enlargement was found to increase as the instrument was inserted further into the root canal. As shown by the torque-insertion distance curve of EW, the cutting torque increased with the number of cutting times. At both rotational speeds, ΔT tended to increase and cutting efficiency tended to decrease as the cutting time was increased. From observations of the cross section of the cutting part, wear was observed in the cutting edge after the final cutting, and this wear indicates increased ΔT. Conclusion: These results suggested that prolonged use of EW .08 taper Ni-Ti rotary instruments significantly reduces their cutting efficiency.
目的 : ニッケルチタン製の根管口拡大形成器具は, 根管口および根管上部1/3の切削用に設計されている. 本研究の目的は, 2種の回転数における10回の繰り返し根管切削で生じるトルクの変化を比較し, 器具の損耗を検証することにある. 材料と方法 : ニッケルチタン製テーパー8/100のエンドウェーブ (モリタ, 以下, EW) と真っすぐな根管を有する樹脂製の規格化根管模型を用いた. 模型は, 象牙質と切削感を類似させたものを使用した. コンピュータ制御の根管切削トルク測定装置を使用し, 回転数はそれぞれ300rpmと600rpmに設定した. 器具を根管の8mm内方まで進入させた. 根管への器具の押し込み速度は0.01mm/secに設定し, 各実験条件での発生トルクを記録した. 切削後の刃部をナイロンブラシで清掃し, 5分間の超音波洗浄を行った後, 根管の切削, 刃部の清掃操作を10回繰り返して行った. なお, 各実験条件につき5本の根管模型を用いた. 切削の評価は, トルク-進入距離を基としたトルク変動の算出 (ΔT) により解析を行った. 加えて, 10回繰り返し切削後のEWの形態の変化を観察した. 成績 : 根管口部の拡大では, 根管内にファイルが進入していくに伴いトルクが発生し, EWのトルク-変位曲線において, 切削回数が増加すると切削トルクが増大することが示された. いずれの回転数でも切削回数の増加によりΔTは増大し, 切削効率は低下した. 刃部断面の観察で, 10回切削終了後の切れ刃には損耗が認められた. この損耗がΔTの増大をもたらしていることが示された. 結論 : これらの結果から, ニッケルチタン製テーパー8/100のEWを過度に繰り返して使用すると, 切削効率の低下を招くことが示唆された. Purpose: Ni-Ti orifice openers were designed to prepare the coronal and middle third of canals. The purpose of this study was to compare the generated cutting torque after 10 continuous uses at two rotational speeds. Methods: EndoWave .08 Ni-Ti rotary instruments (EW; J. Morita) and standardized straight root canal models were used in this study. The root canal model made of resin, which has a cut feeling similar to that of dentin, was used. A computer controlled torque testing device was used for this experiment. Instruments were inserted to a depth of 8 mm into the root canal. The rotational speed was fixed at 300 rpm and 600 rpm, respectively. The insertion speed into the root canal was set at 0.01 mm/sec. The torque generated under each experimental condition was recorded. The cutting blade was cleaned with a toothbrush after each use and was subjected to ultrasonic cleaning for five minutes. The same cutting procedure was repeated 10 times. Five root canal models were used for each experimental condition. The cutting efficacy was analyzed based on the torque-insertion distance and the variation in torque (ΔT) was calculated. The file was observed morphologically after the final cutting. Results: The torque generated in root canal orifice enlargement was found to increase as the instrument was inserted further into the root canal. As shown by the torque-insertion distance curve of EW, the cutting torque increased with the number of cutting times. At both rotational speeds, ΔT tended to increase and cutting efficiency tended to decrease as the cutting time was increased. From observations of the cross section of the cutting part, wear was observed in the cutting edge after the final cutting, and this wear indicates increased ΔT. Conclusion: These results suggested that prolonged use of EW .08 taper Ni-Ti rotary instruments significantly reduces their cutting efficiency. |
| Author | Ichiroh, KATSUUMI Munehiro, MAEDA Toshifumi, OZAWA |
| Author_FL | 前田 宗宏 小澤 稔史 勝海 一郎 |
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| Author_xml | – sequence: 1 fullname: Toshifumi, OZAWA organization: Department of Endodontics, The Nippon Dental University, School of Life Dentistry at Tokyo – sequence: 1 fullname: Munehiro, MAEDA organization: Department of Endodontics, The Nippon Dental University, School of Life Dentistry at Tokyo – sequence: 1 fullname: Ichiroh, KATSUUMI organization: Department of Endodontics, The Nippon Dental University, School of Life Dentistry at Tokyo |
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| References | 8) Buchanan LS. The standardized-taper root canal preparation—Part 1. Concepts for variably tapered shaping instruments. Int Endod J 2000; 33: 516-529. 25) 関根一郎. 歯の硬組織疾患の治療. 安田英一, 戸田忠夫. 歯内治療学. 2版. 医歯薬出版 : 東京 ; 1998. 55-86. 19) Calas P. HERO Shapers®: the adapted pitch concept. Endodontic Topics 2005; 10: 155-162. 15) Ruddle CJ. Nickel titanium rotary systems. Endodontic Practice 2001; 4: 7-16. 26) McGuigan MB, Louca C, Duncan HF. Endodontic instrument fracture: causes and prevention. Br Dent J 2013; 214: 341-348. 17) Walsch H. The hybrid concept of nickel-titanium rotary instrumentation. Dent Clin North Am 2004; 48: 183-202. 18) Gambarini G. The K3 rotary nickel titanium instrument system. Endodontic Topics 2005; 10: 179-182. 1) 前田宗宏, 阿川透久, 都築民幸, 勝海一郎, 横山美穂子, 鈴木多恵子, 石塚克巳, 西宮秀子, 烏帽子田 敬. 根管口部の拡大が直線根管の拡大形成に及ぼす影響に関する研究. 日歯保存誌 2000 ; 43 : 144-150. 11) Paqué F, Musch U, Hülsmann M. Comparison of root canal preparation using RaCe and ProTaper rotary Ni-Ti instruments. Int Endod J 2005; 38: 6-16. 12) Riitano F. Anatomic endodontic technology (AET) —a crown down root canal preparation technique: basic concepts, operative procedure and instruments. Int Endod J 2005; 38: 575-587. 29) Yared G, Kulkarni GK, Ghossayn. An in vitro study of the torsional properties of new and used K3 instruments. Int Endod J 2003; 36: 764-769. 22) 堀江宏紀, 高橋建作, 勝海一郎. エンジン用スチール製ラウンドバーによる切削に関する研究. 日歯保存誌 2003 ; 46 : 751-760. 14) 齋藤次雄, 前田宗宏, 勝海一郎. ニッケルチタン製根管口拡大器具の切削動態に関する研究. 日歯保存誌 2006 ; 49 : 810-821. 31) Leubke NH, Chan KC, Bramson JB. The cutting effectiveness of carbide fissure burs on teeth. J Prosthet Dent 1980; 43: 42-45. 6) Isom T, Marshall JG, Baumgartner JC. Evaluation of root thickness in curved canals after flaring; J Endod 1995; 21: 368-371. 16) Mounce RE. The K3 rotary nickel-titanium file system. Dent Clin North Am 2004; 48: 137-157. 20) 高橋千明, 前田宗宏, 勝海一郎. ピーソーリーマーによる根管口拡大に関する研究. 日歯保存誌 2003 ; 46 : 740-750. 3) Tennert C, Herbert J, Altenburger MJ, Wrbus KT. The effect of cervical preflaring using different rotary nickel-titanium systems on the accuracy of apical file size determination. J Endod 2010; 36: 1669-1672. 7) Hübscher W, Barbakow F, Peters OA. Root canal preparation with FlexMaster: assessment of torque and force in relation to canal anatomy. Int Endod J 2003; 36: 30-76. 10) Schäfer E, Erler M, Dammaschke T. Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 2. Cleaning effectiveness and shaping ability in severely curved root canal of extracted teeth. Int Endod J 2006; 39: 203-212. 24) 久保田智也, 勝海一郎. エンジン用根管拡大形成器具による根管壁切削の様相に関する研究. 日歯保存誌 2006 ; 49 : 200-210. 4) Roane JB, Sabala CL, Ducanson MG. The “Balanced Force” concept for instrumentation of curved canals. J Endod 1985; 11: 203-211. 21) 新井真澄, 前田宗宏, 勝海一郎. ゲーツグリデンドリルによる根管口拡大に関する研究. 日歯保存誌 2004 ; 47 : 858-872. 9) Yared G, Kulkarni GK. Accuracy of the TCM endo III torque control motor for nickel titanium rotary instruments. J Endod 2004; 30: 644-645. 23) 横田 純, 高橋建作, 勝海一郎. 各種エンジン用ラウンドバー類の切削に及ぼす滅菌・消毒の影響. 日歯保存誌 2004 ; 47 : 885-896. 2) Di Fiore PM. A dozen way to prevent nickel-titanium rotary instrument fracture. J Am Dent Assoc 2007; 138: 196-201. 5) Pecora JD, Capelli A, Guerisoli DMZ, Spano JCE, Estrela C. Influence of cervical preflaring on apical file size determination. Int Endod J 2005; 38: 430-435. 13) Schrader C, Ackermann M, Barbakow F. Step-by-step description of a rotary root canal preparation technique. Int Endod J 1999; 32: 312-320. 30) Fite D, Gambarini G, Britto LR. Cyclic fatigue testing of ProTaper NiTi rotary instruments after clinical use. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2004; 97: 251-256. 32) Ounsi HF, Franciosi G, Paragliola R, Huzaimi KA, Salameb Z, Tay FR, Ferrari M, Grandini S. Comparison of two way techniques for assessing the shaping efficacy of repeatedly used nickel-titanium rotary instruments. J Endod 2011; 37: 847-850. 27) Buchanan LS. The standardized-taper root canal preparation—Part 2. GT File selection and handpiece-driven file use. Int Endodo J 2001; 34: 63-71. 28) Yared GM, Bou Dagher FE, Machtou P. Cyclic fatigue of ProFile rotary instruments after clinical use. Int Endod J 2000; 33: 204-207. |
| References_xml | – reference: 11) Paqué F, Musch U, Hülsmann M. Comparison of root canal preparation using RaCe and ProTaper rotary Ni-Ti instruments. Int Endod J 2005; 38: 6-16. – reference: 22) 堀江宏紀, 高橋建作, 勝海一郎. エンジン用スチール製ラウンドバーによる切削に関する研究. 日歯保存誌 2003 ; 46 : 751-760. – reference: 9) Yared G, Kulkarni GK. Accuracy of the TCM endo III torque control motor for nickel titanium rotary instruments. J Endod 2004; 30: 644-645. – reference: 18) Gambarini G. The K3 rotary nickel titanium instrument system. Endodontic Topics 2005; 10: 179-182. – reference: 3) Tennert C, Herbert J, Altenburger MJ, Wrbus KT. The effect of cervical preflaring using different rotary nickel-titanium systems on the accuracy of apical file size determination. J Endod 2010; 36: 1669-1672. – reference: 7) Hübscher W, Barbakow F, Peters OA. Root canal preparation with FlexMaster: assessment of torque and force in relation to canal anatomy. Int Endod J 2003; 36: 30-76. – reference: 23) 横田 純, 高橋建作, 勝海一郎. 各種エンジン用ラウンドバー類の切削に及ぼす滅菌・消毒の影響. 日歯保存誌 2004 ; 47 : 885-896. – reference: 15) Ruddle CJ. Nickel titanium rotary systems. Endodontic Practice 2001; 4: 7-16. – reference: 30) Fite D, Gambarini G, Britto LR. Cyclic fatigue testing of ProTaper NiTi rotary instruments after clinical use. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2004; 97: 251-256. – reference: 13) Schrader C, Ackermann M, Barbakow F. Step-by-step description of a rotary root canal preparation technique. Int Endod J 1999; 32: 312-320. – reference: 28) Yared GM, Bou Dagher FE, Machtou P. Cyclic fatigue of ProFile rotary instruments after clinical use. Int Endod J 2000; 33: 204-207. – reference: 2) Di Fiore PM. A dozen way to prevent nickel-titanium rotary instrument fracture. J Am Dent Assoc 2007; 138: 196-201. – reference: 5) Pecora JD, Capelli A, Guerisoli DMZ, Spano JCE, Estrela C. Influence of cervical preflaring on apical file size determination. Int Endod J 2005; 38: 430-435. – reference: 8) Buchanan LS. The standardized-taper root canal preparation—Part 1. Concepts for variably tapered shaping instruments. Int Endod J 2000; 33: 516-529. – reference: 6) Isom T, Marshall JG, Baumgartner JC. Evaluation of root thickness in curved canals after flaring; J Endod 1995; 21: 368-371. – reference: 12) Riitano F. Anatomic endodontic technology (AET) —a crown down root canal preparation technique: basic concepts, operative procedure and instruments. Int Endod J 2005; 38: 575-587. – reference: 24) 久保田智也, 勝海一郎. エンジン用根管拡大形成器具による根管壁切削の様相に関する研究. 日歯保存誌 2006 ; 49 : 200-210. – reference: 1) 前田宗宏, 阿川透久, 都築民幸, 勝海一郎, 横山美穂子, 鈴木多恵子, 石塚克巳, 西宮秀子, 烏帽子田 敬. 根管口部の拡大が直線根管の拡大形成に及ぼす影響に関する研究. 日歯保存誌 2000 ; 43 : 144-150. – reference: 4) Roane JB, Sabala CL, Ducanson MG. The “Balanced Force” concept for instrumentation of curved canals. J Endod 1985; 11: 203-211. – reference: 10) Schäfer E, Erler M, Dammaschke T. Comparative study on the shaping ability and cleaning efficiency of rotary Mtwo instruments. Part 2. Cleaning effectiveness and shaping ability in severely curved root canal of extracted teeth. Int Endod J 2006; 39: 203-212. – reference: 17) Walsch H. The hybrid concept of nickel-titanium rotary instrumentation. Dent Clin North Am 2004; 48: 183-202. – reference: 29) Yared G, Kulkarni GK, Ghossayn. An in vitro study of the torsional properties of new and used K3 instruments. Int Endod J 2003; 36: 764-769. – reference: 26) McGuigan MB, Louca C, Duncan HF. Endodontic instrument fracture: causes and prevention. Br Dent J 2013; 214: 341-348. – reference: 32) Ounsi HF, Franciosi G, Paragliola R, Huzaimi KA, Salameb Z, Tay FR, Ferrari M, Grandini S. Comparison of two way techniques for assessing the shaping efficacy of repeatedly used nickel-titanium rotary instruments. J Endod 2011; 37: 847-850. – reference: 19) Calas P. HERO Shapers®: the adapted pitch concept. Endodontic Topics 2005; 10: 155-162. – reference: 14) 齋藤次雄, 前田宗宏, 勝海一郎. ニッケルチタン製根管口拡大器具の切削動態に関する研究. 日歯保存誌 2006 ; 49 : 810-821. – reference: 16) Mounce RE. The K3 rotary nickel-titanium file system. Dent Clin North Am 2004; 48: 137-157. – reference: 20) 高橋千明, 前田宗宏, 勝海一郎. ピーソーリーマーによる根管口拡大に関する研究. 日歯保存誌 2003 ; 46 : 740-750. – reference: 27) Buchanan LS. The standardized-taper root canal preparation—Part 2. GT File selection and handpiece-driven file use. Int Endodo J 2001; 34: 63-71. – reference: 21) 新井真澄, 前田宗宏, 勝海一郎. ゲーツグリデンドリルによる根管口拡大に関する研究. 日歯保存誌 2004 ; 47 : 858-872. – reference: 25) 関根一郎. 歯の硬組織疾患の治療. 安田英一, 戸田忠夫. 歯内治療学. 2版. 医歯薬出版 : 東京 ; 1998. 55-86. – reference: 31) Leubke NH, Chan KC, Bramson JB. The cutting effectiveness of carbide fissure burs on teeth. J Prosthet Dent 1980; 43: 42-45. |
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| Snippet | Purpose: Ni-Ti orifice openers were designed to prepare the coronal and middle third of canals. The purpose of this study was to compare the generated cutting... |
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| SubjectTerms | continuous use cutting torque Ni-Ti orifice openers ニッケルチタン製根管口拡大器具 切削トルク 繰り返し切削 |
| Title | Influence of Cutting Aspect on Continuous Use of Ni-Ti Orifice Opener |
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