Biomedical subjects

Ami Smidt

Publications and source records attributed to Ami Smidt.

7 recordsLinked to original sources

PubMed2005

Orthodontic extrusion of an extensively broken down anterior tooth: a clinical report.

A predictable esthetic restoration is not limited to the restored teeth; it has to include the gingival unit and its interface with the teeth involved. Failure to deliver restorations that maintain gingival health jeopardizes the success of any restorative procedure and creates potential for periodontal problems. Perforations, fractures, root resorption, or caries in the cervical area of the tooth, especially in the anterior part of the mouth, present many challenges to the clinician. Failure to place the crown margins on sound tooth material may violate the biologic width and should be considered a restorative failure. Orthodontic root extrusion or forced eruption is a well-documented clinical method for altering the relation between a nonrestorable tooth and its attachment apparatus, elevating sound tooth material from within the alveolar socket. It has some advantages over surgical crown lengthening, which is less conservative considering the sacrifice of supporting bone and the negative change in the length of the clinical crowns of both the tooth and its neighbors. This article presents a case of a maxillary right lateral incisor, extensively broken down following trauma, treated with orthodontic extrusion combined with gingival fiberotomy, without a need for a corrective surgical procedure.

Adult↗

PubMed2003

Techniques for immediate core buildup of endodontically treated teeth.

Access to the pulp chamber for endodontic treatment is indicated inter alia as a result of extensive caries, trauma to the tooth causing fracture or loss of vitality, requiring restoration of the missing tooth structure. Different approaches and materials are described in the literature for foundation restorations, either with a cast post and core or immediately, with a chairside post-and-core system. This article briefly reviews the current data regarding the microbiologic, prosthetic, mechanical, and periodontal aspects while emphasizing the immediate approach using amalgam, resin composites, and glass ionomers. Factors affecting retention of the post are presented to guide the clinician in selecting a suitable post-and-core system to preserve optimal root structure and prevent root fracture. Three clinical cases are presented in which tooth structure was restored using different techniques: in the first two, provisional acrylic resin shells, one custom made and the other prefabricated, were used to house an amalgam coronal-radicular dowel core, where in the third case, a copper band was used for a composite post-and-core system. All cases emphasize the ease of production and short chairtime in the stages of crown fabrication.

Acrylic Resins↗

PubMed2002

Esthetic provisional replacement of a single anterior tooth during the implant healing phase: a clinical report.

Replacement of a missing anterior tooth with an implant-assisted restoration rather than a fixed partial denture is considered common practice. Implant placement with a 2-stage surgical approach in the anterior area of the mouth may be imperative and require an esthetic provisional replacement for the missing tooth during the healing phase. This provisional restoration should help optimize the health of hard and soft tissues around the implant without exerting pressure on the residual ridge and maintain the position of the adjacent and opposing teeth. This clinical report presents a technique for fabricating an anterior fixed provisional restoration with composite reinforced with a leno-woven polyethylene ribbon.

Adult↗

PubMed2002

Gaining adequate interdental space with modified elastic separating rings: rationale and technique.

Restoring a tooth with an inadequate contact point and root proximity is a challenge to the practitioner. Ignoring such situations or making compromises in the treatment plan may hinder a successful treatment outcome. Treatment options include strategic extractions, sectional orthodontics, and minor orthodontic movements. The purpose of this article is to discuss the clinical problems and difficulties arising from this situation and to present a modified treatment modality through two case reports. Elastic separating rings, which open an interdental space for placing orthodontic appliances, can be modified to serve as a preprosthetic means for solving mesiodistal crowding of teeth in daily practice. The classic method is modified by the use of elastic rings in sequentially increased thickness, so that the space gained with one ring is followed and increased with a thicker one. An orthodontic background and special instruments are not necessary.

Adult↗

PubMedDate not supplied

A clinical and cost-benefit evaluation of five facebows.

OBJECTIVE: Although the use of an arbitrary facebow and a full-sized articulator can reduce laboratory errors, many dentists do not use a facebow routinely because the procedure seems to be both intricate and time consuming. The purpose of the present study was to evaluate four earpiece-type facebows and the Snow facebow and to compare the time required for registration, the ease of manipulation, and cost-benefit considerations. METHOD AND MATERIALS: Twenty-five dentists who routinely used only the Snow facebow were asked, after a brief explanation, to perform registrations with the Snow facebow and four new-generation, earpiece-type facebows. The time required for each facebow registration was recorded. Dentists were also asked to fill out a questionnaire concerning ease of manipulation and cost-benefit factors. RESULTS: The Quick facebow was the facebow of choice of most of the dentists because of its favorable design and usage characteristics and cost-benefit ratio. The Artex 3-D facebow proved to be both the easiest and the fastest to manipulate. The Spring-bow and the Whip-Mix Quickmount were next in rank, and the Snow facebow scored the lowest. CONCLUSION: The use of earpiece-type facebows is both simple and fast, and practitioners judged this type of facebow to be superior to the Snow facebow.

Attitude of Health Personnel↗

PubMedDate not supplied

The use of an existing cast post and core as an anchor for extrusive movement.

PURPOSE: This article describes an original solution for a tooth with an existing cast post and core placed subgingivally. MATERIALS AND METHODS: The tooth was erupted rapidly using a simplified and easy technique that incorporates fiberotomy during the process of movement. RESULTS: The distal finish line of the core, which was subgingival before movement onset, was elevated, allowing the placement of crown margins on sound tooth structure. Clinical evaluation of the tooth after a period of 4 weeks, during which a provisional acrylic resin crown was used for retention, showed no need for corrective surgery, and fabrication of a metal-ceramic crown (Captek) was begun. CONCLUSION: When failing to place crown margins on sound tooth structure, the existence of a cast post and core in such a nonrestorable tooth may serve as an anchor in the process of rapid extrusion. Following the need to respect the biologic width and fulfill the obligatory ferrule effect circumferentially, this extrusive treatment modality was applied to meet high treatment standards.

Adult↗

PubMedDate not supplied

Migration following crown-lengthening procedure--a case report.

Periodontal surgery may be accompanied with some postoperative complications such as pain, swelling and sloughing, purulence or infection, transient bacteremia, nerve trauma, and hemorrhage. In general, a resective surgical intervention may implicate reduction in the attachment apparatus. Migration as a postoperative complication has never been addressed in the literature. This paper presents a case report detailing migration of a tooth, following a surgical preprosthetic clinical crown-lengthening procedure, which was repositioned using adjunctive orthodontics with a removable maxillary modified Hawley appliance. It is incumbent upon the dentist to examine meticulously the occlusal status of the teeth prior to a planned surgical intervention and to take measures preventing any possible tooth migration during the healing process. Failure to achieve occlusal and intra-arch stability may lead to undesired tooth movement in the arch postsurgery, affecting future prognosis and complicating any planned prosthetic work.

Aged↗