Access Cavity Preparation in : Maxillary Lateral Incisor
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This document discusses guidelines and principles for locating canals and preparing access cavities for endodontic treatment. It covers:
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- Preparing the access cavity is an important first step to identify all root canals so they can be treated.
- General principles for access cavity preparation include doing no harm, confirming diagnosis, and allowing straight-line access.
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- General principles for access cavity preparation include doing no harm, confirming diagnosis, and allowing straight-line access.
- Techniques for locating canals using anatomical landmarks like the cementoenamel junction and developmental root lines are described.
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1. The document discusses electronic apex locators (EALs), which are devices used to determine the working length of a root canal without radiography.
2. It describes the six generations of EALs, from first-generation resistance-based devices to sixth-generation adaptive apex locators. Key EAL models are provided for each generation.
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This document provides guidance on accessing tooth canals during root canal treatment. It discusses locating all canals, removing pulp tissue while conserving tooth structure. Access openings should be made under rubber dam isolation using high-speed instruments with good illumination. Tooth anatomy and pre-operative x-rays are used to determine the number and location of canals. Care must be taken to locate extra canals which may be present, especially in teeth with complex anatomy.
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2. The principles of access cavity preparation include establishing an outline form based on pulp chamber size and shape and the number/direction of root canals, providing a convenience form for improved visibility and instrumentation, and removing caries/defective restorations and debris from the pulp chamber.
3. Key steps in access cavity preparation depend on the specific tooth but involve using burs and instruments to locate and prepare access to all root canal orifices while avoiding errors like
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The document discusses diseases of the dental pulp. It begins with an introduction to the pulp, including its composition and role in tooth development. It then discusses the pathophysiology of pulpal disease, describing how noxious stimuli can lead to inflammation and necrosis by disrupting blood flow. Several classifications of pulpal diseases are presented, including those based on histopathology, clinical symptoms, and the World Health Organization framework. Etiological agents are explored, such as mechanical trauma, thermal or chemical insults, bacterial invasion, and idiopathic causes. Specific pulpal diseases like reversible and irreversible pulpitis are also mentioned.
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Working length is the distance from a coronal reference point to the point where canal preparation and obturation should terminate. It is important to determine working length precisely using radiographs or electronic apex locators. The radiographic method involves measuring the total length of the tooth on preoperative radiographs, subtracting 1mm as a safety factor, and confirming length under radiograph after instrumentation. Electronic apex locators use electric current to detect the apical foramen. Tactile methods are unreliable due to risk of over-instrumentation or under-instrumentation.
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Impression tecnique for implant supported rehabilitation/ dental courses
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and
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Access Cavity Preparation in : Maxillary Lateral Incisor
- 1. Prepared by : Ghadeer suwaimil
- 2. Outline Introduction. Access cavity. Objective of access cavity. Guidelines for Access Cavity Preparation. References
- 3. A clear understanding of the anatomy of human teeth becomes an essential prerequisite for achieving the objectives of access, through cleaning, disinfection, and obturation of the pulp space. In this presentation we have tried to describe the access opening of maxillary lateral incisor . Introduction
- 4. Introduction Average length of 21- 22 mm. It has a single canal and a single apical foramen. The canal form is usually Type I. In young patients have two only pulp horn and is wider in labiopalatal dimension. The canal is tapered and the apex is often curved generally in distal direction.
- 5. Access cavity The access cavity preparation generally refers to the part of the cavity from the occlusion table to the canal orifice.
- 6. Objective of Access cavity Well designed access preparation is essential for a good endodontic result. Without adequate access, instruments and material becomes difficult to handle properly in the highly complex and variable canal system.
- 7. So : Objective of Access cavity To achieve a straight or direct line access to the apical foramen. To locate all root canal orifice. To conserve sound tooth structure. Well prepared and correct access cavity allow complete irrigation, shaping ,cleaning and quality obturation. Ideal access results in a straight entry into the canal orifice, with the line angles forming a funnel that drops smoothly into the canal.
- 8. Guidelines for Access Cavity Preparation 1. Visualization of internal anatomy because internal anatomy dictates access shape. This require evaluation of angled peri-apical radiograph , examination of coronal and cervical tooth anatomy.
- 9. 2. Preparation of the access cavity is through The center of lingual surface in anatomic crown. 3. round bur or tapered fissure bur is used to penetrate the enamel and slightly into the dentine
- 10. 4. The bur is directed perpendicular to the lingual surface as the external outline opening is created. 5 . Penetration of the pulp chamber roof is continuing with the same round or tapered fissure bur, we change the angle of the bur from perpendicular to the lingual surface to parallel to the long axis of the tooth.until the roof of the pulp chamber is penetrated, frequently a drop-in effect is felt when the penetration occurs.
- 12. 6. Once the pulp chamber has been penetrated, the remaining roof is removed by catching the end of a round bur under the lip of the dentin roof and cutting on the bur ‘s removal stroke.
- 13. 7. Identification of All Canal Orifices By endodontic explorer 8.Removal of lingual shoulder, orifice and coronal flaring Once the orifice has been identified, the lingual shoulder is removed. Lingual Shoulder-: this is the lingual shelf of dentin that extends from the cingulum to a point approximately 2mm apical to the orifice.
- 14. At the end : 9.Straight line access determination by endodontic file And 10. Refinement and smoothing of restorating margins.
- 16. Ghadeer hassan