Conservative Dentistry Trivia Quiz!

The correct answer is 45 degrees. In class II inlay preparation, a gingival bevel is used to create an angle on the gingival margin of the tooth preparation. This bevel helps to provide a smooth transition between the tooth structure and the restoration, reducing the risk of plaque accumulation and improving the longevity of the restoration. A 45-degree bevel is commonly used in class II inlay preparations to achieve these benefits.

This answer is correct because an interproximal carious lesion refers to a cavity or decay that occurs between two adjacent teeth. The gingival to contact area refers to the area near the gum line where the two teeth make contact. Therefore, it is the most likely location for an interproximal carious lesion to be seen. The other options, lingual to contact area and buccal to contact area, refer to the areas on the tongue side and cheek side of the teeth, respectively, which are less likely to be affected by interproximal caries.

The correct answer is "Admixed high copper" because posterior class 2 amalgam restorations require a strong and durable material. Admixed high copper amalgam has a higher copper content, which improves its strength and corrosion resistance. This type of amalgam is commonly used for posterior restorations where the chewing forces are greater.

The width of the blade is measured in tenth of millimetres because it provides a more precise measurement compared to measuring in millimetres. Measuring in tenth of millimetres allows for finer adjustments and accuracy when working with blades, especially in industries such as manufacturing or carpentry where precision is crucial. Measuring in both millimetres and tenth of millimetres would be redundant, and measuring in none would not provide any measurement at all.

Secondary retention refers to the use of undercuts or mechanical features in a dental restoration to enhance its stability and prevent dislodgement. The cove, a concave area in the preparation of a tooth, can be utilized to provide secondary retention by creating an undercut that helps in retaining the dental material. Therefore, the cove is used for secondary retention.

Carbon steel has a higher cutting efficiency compared to stainless steel. This is because carbon steel has a higher carbon content, which makes it harder and stronger than stainless steel. The increased hardness allows carbon steel to retain its sharpness for longer periods and withstand higher cutting forces. On the other hand, stainless steel contains a higher amount of chromium, which improves its corrosion resistance but makes it softer and less efficient for cutting purposes. Therefore, carbon steel is the preferred choice when high cutting efficiency is required.

For a cast inlay, the walls should diverge. Diverging walls refer to the walls of the prepared tooth being slightly wider at the occlusal surface compared to the base of the preparation. This tapering allows for easier insertion and removal of the cast inlay. It also helps in achieving proper retention and resistance form for the restoration. Converging walls would make it difficult to insert and remove the inlay, and may compromise the fit and stability of the restoration.

The correct answer is "Axiogingival line angle." The axiogingival line angle refers to the angle formed by the junction of the axiogingival line and the tooth surface. A reverse bevel is a type of bevel that is placed on the axiogingival line angle of a tooth preparation. This bevel is created by removing a small portion of the tooth structure at the axiogingival line angle in a reverse direction. By placing a reverse bevel at the axiogingival line angle, the restoration can have better retention and resistance to displacement.

Class II restorations are typically used to restore cavities in the posterior teeth, specifically in the premolars and molars. These restorations involve the removal of decayed tooth structure and the placement of a filling material. The point angle refers to the junction of three surfaces on a tooth. In a class II restoration, there are six point angles: two mesial point angles, two distal point angles, and two occlusal point angles. Therefore, the correct answer is 6.

Cast gold is not used in both deciduous teeth and young age. Deciduous teeth are temporary teeth that are eventually replaced by permanent teeth, so it is not necessary to use cast gold in them. Additionally, young age refers to children who are still growing and developing, and their dental needs may be better addressed using other materials or treatments. Therefore, cast gold is not used in both of these situations.

The taper used for porcelain inlay is 6-8 degrees per wall. This means that the walls of the preparation for the porcelain inlay should have a slight divergence of 6-8 degrees from the vertical axis. This taper is necessary to ensure proper retention and resistance of the restoration, as well as to facilitate the insertion and removal of the inlay. A taper that is too shallow may result in inadequate retention, while a taper that is too steep may compromise the structural integrity of the tooth.

The correct answer is 3:1. This ratio refers to the powder-to-liquid ratio of MTA (Mineral Trioxide Aggregate) which is a dental material commonly used in endodontic procedures. The 3:1 ratio means that for every 3 parts of powder, 1 part of liquid is used to mix the MTA. This specific ratio is important as it ensures the proper consistency and setting properties of the MTA, allowing it to effectively seal and repair dental structures.

Piggy back wedging is the correct answer because it refers to a technique used in patients with interproximal recession. This technique involves placing two wedges side by side, with one wedge acting as a support for the other. This helps to create a stable base and provides better isolation of the tooth being worked on. Double wedging, wedge wedging, and all are not specific techniques used for interproximal recession.

The correct answer is tertiary amine. Tertiary amine is commonly used as an activator in self-cure resin systems. It acts as a catalyst, promoting the polymerization reaction and accelerating the curing process. This helps to ensure that the resin sets and hardens properly. Benzoin dimethyl ether is not typically used as an activator in self-cure resins, and the option "both" suggests that both benzoin dimethyl ether and tertiary amine are activators, which is not accurate. The option "none" implies that there is no activator required, which is also incorrect.

It is unclear what the "keys diagram" refers to in this question. Without further context or information, it is not possible to provide a meaningful explanation for why time was added in the diagram by Newbrun.

Preparing a depth of 0.2-0.8 mm pulpally comes under the category of outline form. The outline form is the initial step in dental preparation, where the outer shape of the tooth is established. It involves removing the decayed or damaged tooth structure and creating a smooth, well-defined outline that will guide the subsequent steps of tooth preparation. The depth mentioned in the question falls within the range typically considered for establishing the outline form.

Type V glass ionomer cement is commonly used in orthodontics as an adhesive for bonding brackets to teeth. It has a high bond strength, good flowability, and releases fluoride, which helps in preventing tooth decay. This type of cement is also known for its easy handling and quick setting time, making it suitable for orthodontic procedures.

Bevelling is avoided in ceramic restoration because ceramic materials are brittle and prone to chipping or fracturing. Bevelling involves creating an angled edge on the restoration to improve its fit and aesthetics. However, in ceramics, this can weaken the restoration and increase the risk of fracture. Therefore, it is best to avoid bevelling in ceramic restorations to ensure their strength and longevity.

The ideal ratio of the pin to dentin and outside in pin retained amalgam is 2:1. This means that the length of the pin should be twice the thickness of the dentin and the outer layer combined. This ratio ensures proper retention and stability of the amalgam restoration.

When pins are used in amalgam, their presence creates additional stress concentration points within the material. This leads to a decrease in the overall strength of the amalgam. The stress concentration points can act as weak spots, making the material more prone to fracture or failure. Therefore, the strength of the amalgam decreases when pins are used.