Rotary instrumentation Lec 10 Rotary instrumentation Problems associated
Rotary instrumentation Lec. 10 ﺑﻠﻨﺪ ﻣﺤﻤﺪ ﺳﻠﻴﻢ. ﺩ
Rotary instrumentation Problems associated with hand & rotary instrumentation with stainless steel includes: 1 -Too many instruments & steps needed to generate the desired shape, thus increasing the time of canal preparation. 2 -Each resultant shape will be different, making obturation less predictable. 3 -Canal transportation naturally results as instruments increase in diameter & stiffness. 4 -The use of traditional coronal enlargement burs such as Gates. Glidden drills can cause excessive dentin removed.
Rotary Instrumentation Using Nickel Titanium Profile Taper 0. 04 – 0. 06 taper U-shaped 275 to 325 rpm
Rotary Instrumentation Using Nickel Titanium Profile 0. 04 & 0. 06 taper rotary instrument are proportionately sized nickeltitanium U-shaped instruments designed for use in a controlled, slow-speed, hightorque, rotary handpiece. The preferred speed range is still from 275 to 325 rpm. They produce an accelerated step-down preparation, resulting in a funnel-form taper from orifice to apex. As these "reamers" rotate clockwise, pulp tissue & dentinal debris are removed & travel counter clockwise backup the shaft. The instruments require periodic removed of dentin "mud" that has filled the "U" portion of the file. The U-blade design, has flat outer edges that cut with a planning action, allowing it to remain more centered in the canal compared to conventional instruments. These Profile variable taper instruments are manufactured in standard ISO sizing as well as series 29 standard (ie, every instrument increases 29% in diameter).
replace Gates-Glidden drills for shaping the coronal portion of the canal. the total length of the orifice openers is 19 mm, with a cutting length of approximately 9 mm. Their tapered, radial-landed flutes & U-file design, these instruments remain centered in the canal. Pre flaring allows for more effective cleaning & shaping of the apical half of the canal with the profile series 0. 04 tapers. In contrast to profile tapers, however, Besides reducing file separation, this shorter length also makes them easier to manipulate in difficult access areas. ISO tip size of 30, 40, & 50 are built into these files with tapers of 0. 06 & 0. 07. The 0. 04 is more suitable for small canals & apical regions of most canals, including the mesial roots of mandibular molars & buccal roots of maxillary molars. The 0. 06 is recommended for the mid root portions of most canals, distal roots of mandibular molars, the palatal roots of maxillary molars. (the clinician has the option of using alternating tapers within a single canal, ie, combinations of 0. 04, 0. 06,
The orifice shapers O. S. 0. 06 – 0. 07 mm/mm 19 mm Clinician has the option of using alternating tapers within a single canal, ie, combinations of 0. 04, 0. 06, & 0. 07 taper profile instruments
Profile GT Rotary Instrumentation 0. 06 , 0. 08 , 0. 1 &0. 12 Taper
Pro Taper Rotary System Shaping files S-x, S-1, S-2
Finishing files F-1, F-2, & F-3
Pro Taper Benefits Improves flexibility & "carving" efficiency Optimize cutting action Both remove the debris & soft tissue Triangular cross-section increase safety, cutting action, & tactile sense Modified tip can easily follow a prepared glide path without gouging side walls
Laser Endodontics Nd: YAG & a carbon-dioxide laser 1 -the periapex 2 -the root canal system 3 -hard tissue, mainly the dentin Endodontic therapy: Bacterial reduction Modify the root canal surface
Engine – Driven Instruments Rotary Contra-Angle Handpiece Instruments
Reciprocating Handpiece
Vertical Stroke Handpiece Ultrasonic Handpiece cavitations vacuum-like implosion collapse
Sonic hand pieces The sharper Sonic Rispisonic Trio Sonic
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