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Showing posts with the label final year bds

abutment and finish lines

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In dentistry, a finish line refers to the termination point of a prepared tooth surface where the restoration (e.g., crown or bridge) will meet the tooth structure. The design and placement of finish lines play a crucial role in the success and longevity of the dental restoration. A well-prepared finish line ensures optimal fit, retention, and esthetics of the final restoration. There are different types of finish lines used in various situations: 1. Chamfer Finish Line:    - A chamfer finish line is a continuous, beveled edge that runs circumferentially around the tooth preparation.    - It provides a smooth, angled termination of the tooth structure, making it easier to seat the restoration accurately.    - Chamfer finish lines are commonly used for metal-ceramic crowns. 2. Shoulder Finish Line:    - A shoulder finish line is a distinct, defined ledge that is perpendicular to the axial wall of the tooth preparation.    - It offers a well-defined margin for precise seati

maxillary and mandibular edentulous arches

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Anatomical Landmarks on Edentulous Arches: Understanding the Foundation of Denture Construction Edentulous arches, also known as toothless arches, refer to the areas of the upper and lower jaw that are devoid of natural teeth. Dentures, both complete and partial, are commonly used to replace missing teeth in these arches and restore oral function and aesthetics for patients. For successful denture construction, understanding the anatomical landmarks on edentulous arches is essential. These landmarks serve as critical reference points that guide dentists and dental technicians in fabricating well-fitting and functional dentures. Let's explore some of the key anatomical landmarks on edentulous arches: 1. Residual Ridge: The residual ridge, also called the alveolar ridge, is the bony ridge that remains after tooth extraction. It serves as the foundation for denture support and stability. However, the ridge tends to resorb or shrink over time due to lack of teeth stimula

fixed partial dentures

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Fixed partial dentures, commonly known as dental bridges, are dental prosthetic devices used to replace one or more missing teeth. They are fixed or cemented onto the existing natural teeth or dental implants, providing a functional and aesthetic solution for tooth loss. Dental bridges are an excellent treatment option for patients who cannot or do not prefer removable dentures or dental implants. Key Components of Fixed Partial Dentures: 1. Abutment Teeth: Abutment teeth are the natural teeth located on either side of the gap left by the missing tooth or teeth. These teeth serve as support or anchors for the dental bridge. They are prepared by removing a thin layer of enamel to accommodate the bridge's crowns. 2. Pontic: The pontic is the artificial tooth that fills the gap created by the missing tooth. It is attached to the abutment teeth through dental crowns or retainers on each side. Types of Fixed Partial Dentures: 1. Traditional Fixed Partial Dentures: This ty

malocclusion

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Malocclusion refers to a misalignment or incorrect positioning of the teeth when the jaws are closed. It is a common dental condition that can affect both children and adults. Malocclusion can range from mild to severe and may cause various issues related to dental health, aesthetics, and even overall well-being. Here are some important aspects of malocclusion: Causes of Malocclusion: Several factors can contribute to the development of malocclusion: 1. Genetics: In many cases, malocclusion is hereditary and can be passed down through generations. 2. Dental Habits: Thumb sucking, tongue thrusting, prolonged pacifier use, or other oral habits during childhood can influence the alignment of teeth. 3. Premature Tooth Loss: Early loss of primary (baby) teeth or permanent teeth can lead to neighboring teeth drifting into the open space, causing misalignment. 4. Jaw Abnormalities: Irregular jaw growth or size discrepancies between the upper and lower jaws can result in malocclusi