A tooth preparation technique in fixed prosthodontics for students and neophyte dentists

Abstract

A tooth preparation technique in fixed prosthodontics for students and neophyte dentists sonal experience with the novel technique. It could helps dental students and neophyte dentists in their learning curve.Key words: tooth preparation, fixed prosthodontics, dental education, prosthodontics. IntroductionTooth preparation for fixed prosthesis is a common procedure in clinical practice, which all general dentists should perform correctly. However, it could be difficult to obtain always a predictable result, especially for dental students or young doctors: they could make mistakes in their learning curve leading to inadequate results. Unlike other human substance, dental tissues don't have regenerative capacity. Therefore, the removal of dental biological material should be planned and executed with maximum attention (1). The purpose of a fixed prosthodontic therapy may vary from the restoration of a single tooth to the rehabilitation of the complete occlusion. A single tooth can be fully restored both functionally and aesthetically. A missing tooth can be replaced by a fixed prosthesis, increasing patient masticatory competence and maintaining or improving dental arches function, often elevating patient's self-image (2). Tooth preparation should have specific geometrical characteristics to provide necessary retention and resistance to the vertical and lateral forces acting on the restoration. The most important element of retention is the presence of two opposing vertical surfaces. The axial walls of the preparation should taper slightly to allow the cementation of the artificial crown. The more parallel are the axial walls the greater is the retention. However, it is impossible to obtain parallel surfaces without producing undercuts. Goodacre et al. (3) suggest an angle of convergence between 10 and 20°. Moreover, the occlusocervical length is another fundamental factor for both retention and resistance. The longer is the preparation the greater is the retention. Teeth with larger diameter need a greater length to prevent dislodgement (4). Proper occlusal and axial reductions are essentials to provide enough space, allowing a good functional morphology and structural durability. Moreover, no more than necessary dental tissues should be removed in order not to jeopardize tooth structure and retention of the restoration (2). Preston (5) and Miller (6) suggest starting the tooth preparation producing depth-orientation groves on the vestibular and incisal surfaces, with a round-end tapered diamond as reference for removing tooth structure. The occlusal reduction is performed by removing the tooth por- SummaryPurpose. The aim of this study was to evaluate a novel technique of tooth preparation in fixed prosthodontics suitable for dental students and neophyte dentists. Materials and methods.Twenty-four dental students of the sixth-year class were recruited to verify the predicibility of this technique. Each student prepared two mandibular second premolars on a typodont for a dental crown with a 90° shoulder finishin...

Digital Image Correlation and Strain Gauges to Map and Compare Strain in Teeth with Different Quantity and Quality of Remaining Tooth Structure

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Ángulos de convergencia en preparaciones dentarias realizadas en tipodontos por estudiantes de Odontología, Unach

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Effect of Low Power Magnification on Total Occlusal Convergence Angles in Crown Preparation

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