Accreditation Written Examination Free Sample Questions

The core issue is the incorrect axial position of the posterior teeth, not just their surface contour. Orthodontic treatment is the most biologically sound and comprehensive solution to physically move the teeth into the correct position, thereby filling the buccal corridor naturally. While veneers can add buccal volume, they cannot correct the underlying axial inclination and may lead to bulky, unhygienic restorations if the problem is severe. Direct bonding is a temporary and less durable solution. Simply whitening teeth does not address the spatial issue.

With translucent ceramics like feldspathic porcelain, the final shade is a combination of the underlying tooth structure, the cement, and the veneer itself. To significantly shift the shade from A3.5 to A1, the resin cement must have sufficient opacity to block out the dark underlying tooth color while also contributing to the lighter target shade. Using a shaded and opaque try-in paste and corresponding cement is essential for a predictable esthetic outcome. Bond strength, cement thickness, and cure type are important for longevity but do not primarily control the final shade modification.

Restoring a lost VDO is a complex process that requires careful verification. The most predictable and reversible method is to use a diagnostic tool like a removable acrylic splint or provisional restorations. This allows the patient to function at the new VDO for several weeks, enabling the clinician to assess phonetics (e.g., 'S' sounds), comfort of the masticatory muscles, and TMJ health. This trial period confirms the appropriateness of the new VDO before committing to definitive restorations. Relying solely on facial proportions, arbitrary measurements, or phonetics alone is not sufficient and can lead to failure.

While light/laser activation can accelerate the breakdown of hydrogen peroxide, numerous clinical studies have shown that it does not significantly improve the final whitening result or its stability over time compared to properly formulated, chemically-activated systems. The primary factors for success are the concentration of the whitening agent and the duration of contact with the tooth. The heat generated by lights can also increase the risk of tooth sensitivity and pulpal irritation.

The diagnosis of altered passive eruption, confirmed by the apical position of the CEJ relative to the gingival margin with adequate bone support, indicates that excess soft and hard tissue is covering the anatomical crowns. The definitive treatment is surgical crown lengthening, which involves a gingivectomy to expose the CEJ and osseous recontouring to re-establish a proper biologic width (approximately 3mm from the proposed gingival margin to the alveolar crest). This procedure will expose the correct tooth proportions and reduce the gingival display. Orthodontic intrusion is for vertical maxillary excess, veneers would create overly long teeth, and Botox is a temporary solution for a hyperactive lip, not a tissue problem.

A rocking or fulcrum effect is most commonly caused by a single point of contact on the internal (intaglio) surface of the restoration that prevents it from seating fully and stably. This is often a small positive bleb or nodule resulting from a minor imperfection in the die or the milling process. Using a fit-checking material (e.g., silicone paste or occlusal spray) will quickly identify the precise location of the interference, which can then be carefully adjusted. An over-tapered prep would lead to poor retention but not necessarily a specific rock. Sintering distortion is possible but less common. A die spacer issue would typically cause a universally loose or tight fit.

The Golden Proportion (approximately 1.618:1) suggests that, when viewing the smile from the front, each tooth should be about 61.8% of the size of the tooth immediately mesial to it. If the central incisor (the larger element) is 1.618, the lateral incisor (the next element) would be 1.0. Following this, the visible portion of the canine would be approximately 0.618.

The selective-etch (or selective enamel etch) technique combines the benefits of both self-etch and etch-and-rinse systems. By using the universal adhesive in self-etch mode on dentin, the smear layer is modified rather than completely removed, and the dentinal tubules are not exposed as aggressively, which significantly reduces the risk of post-operative sensitivity. Concurrently, selectively etching the enamel margins with phosphoric acid creates a deeper, more retentive etch pattern on the highly mineralized enamel, resulting in a stronger and more durable marginal seal. This hybrid approach optimizes the bond to both substrates.

A youthful and natural smile displays a progressive increase in the size of the incisal embrasures moving distally from the midline. The embrasure between the central incisors is the smallest, the one between the central and lateral is larger, and the one between the lateral and canine is the largest. This graduation helps to delineate the individual teeth and avoid a monolithic, unnatural appearance.