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PubMedDate not supplied

Use of stereolithographic models as diagnostic and restorative aids for predictable immediate loading of implants.

Implant dentistry has evolved into one of the most predictable treatment alternatives in all of medical science. Advances in the surgical and prosthetic components, implant designs and surface technologies, and imaging techniques have allowed for significant modifications to occur with respect to one- and two-stage surgical protocols, accelerating treatment times to the benefit of patient and clinician. This article presents a technique to improve surgical and restorative accuracy, allowing for predictable placement and immediate loading of implants through use of CT imaging, stereolithographic models, and CT-derived surgical templates.

Computer-Aided Design↗
PubMed2006

[Full arch impression techniques utilizing addition type poly vinyl siloxane for fabrication of tooth born fixed partial dentures].

A precise impression is necessary for fabricating an accurately fitting cast restoration. For this purpose, Polyvinyl Siloxane (PVS) impression materials are extremely popular because of their combination of excellent physical properties, handling characteristics and dimensional stability. Its excellent clinical features remain unaffected if simple measures are guarded. This review presents several impression techniques using PVS and recommends the one that provides the most accurate impression, utilizing the superior qualities of the PVS. The one step impression technique where no control of wash bulk and thickness exists, is considered to be the least accurate impression method with measured discrepancies as large as 7 times the original inter preparation distance and 40 times the original cross arch dimensions. Furthermore, the direct contact between the less refined putty material and the tooth preparation, as well as the high prevalence of air bubble entrapment, seriously compromises restoration longevity. The two stage impression technique has proved to produce the most accurate and reliable impressions due to complete control of the wash bulk and thickness entailed. The ideal wash bulk thickness should range between 1 to 2.5 mm all around the abutment tooth in order to minimize distortion of its subsequent die. Using a "Putty Tray" at the first stage with a predetermined space encircling the abutments will allow the wash to flow to its ideal uniform bulk size at the second stage. A uniform bulk size will prevent differential setting contraction and uneven changes at the dimensions of the die. The easiest and most clinically applicable method to achieve the desired space around the preparations is by loading the Putty material with the temporary crowns in place, followed by their removal at the second stage and occupation of the created space by the wash. In general, less control of wash bulk will result in either insufficient or excessive wash material which will determine uneven dimensional changes in the impression. This, in turn, will produce ill fitting cast restoration.

Dental Impression Materials↗
PubMedDate not supplied

The perio-aesthetic-restorative approach for anterior reconstruction--Part II: Restorative treatment.

Inherent differences have been identified between multidisciplinary and interdisciplinary treatment approaches. This article demonstrates the restorative techniques used for the treatment of a patient with congenitally missing lateral incisors according to the interdisciplinary concept outlined in Part I. The restorative design and material selection were based on the size and shape of the existing ridge, occlusion, evaluation of previous treatment, the ability of the restoration to mimic the natural dentition and the supporting gingival tissues, and the patient's expectations and finances.

Acid Etching, Dental↗
PubMed1995

Provisional/transitional implant-retained fixed restorations.

Successful implant-retained restorations are the product of a disciplined and comprehensive approach to diagnosis, treatment planning, precise surgical and restorative procedures and continuing maintenance. The prudent use of provisional/transitional crowns and bridges is an important factor in the attainment of clinical success and patient acceptance of fixed prosthodontic implant dentistry.

Acrylic Resins↗
PubMed1992

An in vivo comparison of radiographic and directly assessed clinical caries status of posterior approximal surfaces in primary and permanent teeth.

At general dental practices in Scotland 211 children between the ages of 5 and 15 years were examined by 1 observer. A comparison of the status of 1,468 permanent and 756 primary posterior approximal surfaces was made on the basis of their appearance on posterior bite-wing radiographs and the findings of a direct in vivo visual examination, made after temporary tooth separation had been achieved over 1 week using elastomeric separation. For permanent tooth surfaces, 0% of radiolucencies in the outer half of enamel, 10.5% in the inner half of enamel, 40.9% extending to the outer half of dentine, and 100% extending to the inner half of the dentine were found clinically to be cavitated. The analogous results for primary teeth were that 2.0, 2.9, 28.3, and 95.5%, respectively, of radiolucencies appeared to be cavitated. Although further research with larger numbers of permanent teeth is indicated, these results may contribute to a re-evaluation of the optimal threshold for restorative intervention at approximal sites. Greater numbers of approximal radiolucencies and carious lesions (p less than 0.001) were found in those surfaces which initially had a normal anatomical contact when compared to those which did not.

Adolescent↗
PubMedDate not supplied

Managing the soft tissue margin: the key to implant aesthetics.

Developing a natural contour and anatomically dimensioned soft tissue margin is critical to attaining an aesthetic implant restoration. Anatomically dimensioned temporary healing abutments can be used to guide the soft tissue healing to the size of the tooth to be replaced. This article discusses aesthetics, indications, contour, available sizes of the abutment, crown "ledge," soft tissue maturation, healing time, and predictability of the procedure. The learning objective of this article is an enhanced understanding of the principles and placement technique of the temporary healing abutments.

Crowns↗
PubMed2002

A novel osteosynthesis plate design for routine corrective facial surgery.

Plating systems for the osteosynthesis of facial osteotomies have different requirements to those used to treat facial fractures. The aim of fracture treatment is anatomical fragment reduction, functional/rigid immobilization, restoration of occlusion and aesthetics, and occasionally defect bridging. In corrective facial surgery however there is a need for intra-operative adjustments related to changes in occlusion and aesthetics, and defect bridging occurs frequently. Postoperatively, training elastics are used to control temporary neuromuscular imbalance. To accommodate these demands a new plating system is presented, based on five requisites: allowance of occlusal and aesthetic adjustment without hardware removal, plate dimensions that accommodate routine skeletal repositionings, reduced hardware volume compared with trauma plating systems, screws that fit the inter-dental spaces when tension banding, and capability for micro-screw fixation of bone grafts in the osteotomy site. The files of 1000 non-congenital facial deformity patients were analyzed. The sagittal, vertical and transverse movements were drawn and the bridging distances calculated. Slotted plates with double-armed interconnections were designed for maxillary, zygomatic-sandwich, chin and segmental osteotomies. A separate design was made for the sagittal split plate. A pilot study was performed using 20 patients. The system showed great versatility and adaptability, but a multicenter morbidity study is necessary, mainly to study postoperative stability.

Adult↗
PubMedDate not supplied

[Gingival preparation].

For the general practitioner, the superficial periodontal structure is an obstacle when trying to gain access, control and visualization to juxta or infra gingival preparations. A temporary restoration will maintain and protect those limits and in many cases it is a very efficient procedure. Sometimes it is necessary to enhance the gingival preparation by sophisticated methods. There are many different technics available to the practitioner. In this article we will describe the technics with easy clinical use and those respecting the gingival tissue (mechanical, physico-chemical).

Dental Impression Technique↗
PubMed1989

Interocclusal wax impressions for use in provisional and associated fixed prosthodontic procedures.

A procedure is presented for the construction of a direct provisional acrylic resin restoration by means of an interocclusal wax impression. This technique requires no preparation or laboratory time and quickly results in a restoration that accurately covers all margins of the preparation and restores proper contact, contour, and occlusion. This procedure can also be used for large restorations, immediate fixed partial dentures, final impressions of preparations, provisional crowns to fit existing removable partial dentures, and some office emergencies.

Acrylic Resins↗
PubMed2000

Laboratory-fabricated, acrylic resin cylinders for fixed, provisional implant restorations.

Commercially produced provisional cylinders are commonly used during fabrication of fixed, provisional implant restorations. A procedure is presented for the fabrication of fixed, provisional implant restorations using laboratory-fabricated, autopolymerizing acrylic resin cylinders. These cylinders offer a number of advantages over commercially produced cylinders and may reduce the treatment cost of implant prosthodontics.

Acrylic Resins↗
PubMed1975

[Restoration of hemi-arcades with amalgam].

As a rule should the half-mouth restorations in the frame of oral rehabilitation be done with gold inlays, overlays or full crowns. It is nevertheless possible to consider such restorations with amalgam and, providing that certain principles and technics and respected, such quadrant restorations could be valuable as well on the periodontal point of view as on the occlusal one. Regarding the periodontal point of view, it is now generally accepted that de restorations of the proximal aspects of the teeth have not to extend under the gingival margin. If this creates a risk for caries recurrences, still questionable, it eliminates the unavoidable periodontal lesions. Regarding the occlusal point of view, it is on the one hand difficult to build up a perfect occlusal restoration with a material which, on the moment the filling is completed acquires only a insufficient fraction of its final resistance. On the other hand it seems impossible to raise the occlusion in one or more teeth for the very same reason. The solution to this problem comprises a dubbel aspect. One has first of all to rebuild to the desired occlusal level the cavities of the whole quadrant with a temporary but resistant material wich allows at once a carefulness mastication. Polycarboxylate cement is suitable for this purpose. This temporary material is then replaced tooth after tooth in one or more sittings with amalgam. The second aspect of the solution consists in the use of amalgam wich acquires faster a sufficent resistance, allowing an ajustment of a perfect occlusion without the danger of fracturing it. Following the first estimates it seems that amalgam made of spherical particules and dispersed phase type alloys could meet with this requirements and bring an acceptable solution to our problem.

Bicuspid↗
PubMed1995

A bonded provisional fixed prosthesis to be worn after implant surgery.

The procedure described provides an esthetic means for inserting a provisional fixed restoration immediately after implant placement surgery. When this procedure is used, it is not necessary to prepare the abutment teeth adjacent to the surgical site for subsequent fixed restorations. This provisional restorative procedure may also be used immediately after extraction of teeth, when abutment tooth preparation is not desired or possible, or after stage II implant surgery when healing caps are inserted.

Acrylic Resins↗
PubMed1999

Tissue sculpturing: an alternative method for improving esthetics of anterior fixed prosthodontics.

Esthetics associated with health of surrounding tissues in fixed prosthodontics is arduous, especially when treating the maxillary anterior region. An unfavorable relationship between residual ridge, pontic, and gingival papilla commonly compromises the final result. Alternative procedures based on biologic procedures can be developed to improve relationships and provide esthetic and functionally acceptable fixed partial dentures. This article describes a technique for the improvement of esthetics with conditioning of the tissue beneath the pontics, by displacing tissue with a treatment restoration. Lateral displacement of tissue under gradual, controlled pressure enhances the interdental papilla, which improves esthetics. The role of plaque control is also discussed in this article.

Alveolar Process↗
PubMed1995

Using the existing prosthesis as a provisional restoration.

The remaking of a fixed prosthesis provides a unique opportunity of converting the existing prosthesis to a provisional restoration for use while a replacement is being made. This article describes a technique for using existing prostheses that offers several advantages: less potential wear, increased provisional strength and retention, decreased clinical time and esthetically acceptable contours.

Dental Caries↗
PubMed1995

A procedure for making fixed prosthodontic impressions with the use of preformed crown shells.

Void-free impressions of tooth preparations for fixed prosthodontics are essential for accurately fitting restorations; however, commonly used impression methods are arduous and time-consuming. A procedure has been developed in which an impression is made in a preformed temporary crown shell for each tooth preparation and then a final over impression is made. The result is an atraumatic and uncomplicated complete-arch impression that incorporates an accurate impression of each prepared tooth.

Crowns↗
PubMed1998

Microleakage of super-EBA with and without finishing as determined by the fluid filtration method.

Super-EBA (SEBA) has been used as a root-end filling material because of its superior sealing properties and clinical success. The purpose of this study was to evaluate whether finishing SEBA after it had set would affect the apical seal. Sixty-five extracted maxillary anterior teeth were instrumented and obturated with a single gutta-percha master cone. The root end was resected, and a 3 mm deep root-end preparation was made using ultrasonic tips. Teeth were randomly divided into three groups. Group 1 received SEBA and was finished with a 30-flute high-speed finishing bur. Group 2 received SEBA, which was cold-burnished with a ball burnisher. Temporary Endodontic Restorative Material was used as the negative control in group 3. Microleakage (microliter/min) was measured under 10 psi using the fluid filtration method at days 1, 7, 30, 90, and 180. SEBA/finished exhibited significant microleakage at day 1 when compared with the burnished group. The differences in leakage were not significant at any other time period.

Dental Leakage↗
PubMed1999

Dental implants. 7. Basic restorative techniques.

Some restorative techniques for implant supported restorations will be familiar to dentists used to providing conventional crown and bridgework. The differences and principles involved when using implants are identified.

Dental Abutments↗
PubMed1995

The use of radiopaque templates for predictable implant placement.

The functional and esthetic needs of the patient who is to receive an implant-retained prosthesis can be established with the help of a provisional restoration that is duplicated in a radiopaque radiographic template. The computer tomogram prepared with the aid of the template allows the evaluation of the implant sites in relation to the outline of the planned restoration. The radiographic template is converted into the surgical template, which contains information regarding the optimal position and angulation of implants. Because the surgical template is a modification of the radiographic template, which rests rigidly on the teeth during all procedures, implant placement is more predictable.

Contrast Media↗