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At least 1,297 records · Page 72Linked to original sources
PubMed1994

Restoration of the maxillary arch using implants, natural teeth and the Konus crown: a case study.

Restoring the maxillary arch by using a suprastructure retained by a Konus crown means that the patient can remove the crown for oral hygiene. This construction enables large embrasure spaces to be avoided without compromising phonetics, that is, without adversely affecting the patient's speech. It also enables the dental surgeon to monitor the tooth and implant abutments and the soft tissues around them. In this article we demonstrate successful restoration of the maxillary arch by the use of Konus crowns on a combination of implants and natural teeth.

Crowns↗
PubMed1994

Cosmetic dentistry and implant prosthetics.

It is our obligation to give our patients options so they can make decisions on what treatments they will pursue. Implants certainly provide us with a new set of tools to solve our patients' cosmetic and functional needs. Cosmetic and implant dentistry have both come a long way; the marriage of these two areas has elevated dentistry to a new plateau.

Dental Implants↗
PubMed1993

On long-term maintenance of the osseointegrated response.

Every oral implant system must be backed up by controlled reporting of the clinical outcome. Look-alike implants do not necessarily show similar long-term clinical results. Osseointegration of an implant is not the same as clinical success, as secondary loss of osseointegration may be a frequent problem with respect to certain biomaterials as well as implant designs. For instance, with respect to solid cylinders, there is no published report documenting that such implants ever establish a steady state with respect to bone height. A continuous bone loss of half a millimetre or more will inevitably jeopardise the outcome of the implant over follow-up times of five to ten years. The author suggests a new way of reporting the outcome of oral implants in a four field table with Success, Survival, Unaccounted for and Failure categories. Success applies to those implants that meet with specific Success criteria. Survival are those implants that are still in the jaw of the patient but where criteria for success or failure are not met. Unaccounted for are implants in patients who dropped out from the study for one reason or the other including patient death. Failures are those implants which have been removed from the jaw or where absolute failure criteria such as implant mobility or therapy-resistant pain apply.

Alveolar Bone Loss↗
PubMed1994

Restoring the single lower incisor implant with esthetics, antirotation, and retrievability.

The long-term success of restoring the lower incisor implant is partially dependent on retrievability of all components down to the implant. Because this implant is usually placed vertically or buccally in the bone, the ability to achieve esthetics without seeing the screw access hole becomes critical. The emergence profile of the crown overlying the implant fixture ultimately dictates the esthetics. The single crown can also become loose during function and, therefore, antirotation of the abutment is imperative. The Octa-Hex Implant Restoration System presents an alternative method of achieving gingival seal with a titanium-alloy connector to the implant, emergence profile with a custom-fabricated casting on this connector, antirotation from intimate contact with implant indexing, and retrievability by a fixation screw and cementation. With the lower incisor, this system offers retrievability without the screw access hole affecting esthetics.

Crowns↗
PubMed1993

Practical stress absorption by means of modified abutments. Case presentations.

To improve the success rates of implants, numerous clinicians suggest progressive bone loading. The effectiveness of progressive loading can be enhanced by the use of stress-absorbing components. This paper reviews a polyoxymethylene intramobile element, which provides a resilient connection between the implant and prosthesis and reduces the stress transmitted to the implant and supporting bone, resulting in an improved long-term performance. This paper also introduces a relatively new intramobile connector system, which provides stress absorption and distributes the masticatory load in physiologic manner to the bone surrounding the implants. Types of bone and their locations in the mandible and the maxilla are discussed. Four case reports are used to illustrate the clinical procedure. The learning objective of this article is to expand the knowledge of available enhancements in stress absorption.

Dental Abutments↗
PubMedDate not supplied

Effect of grooves on resistance/retention form of Class 2 approximal slot amalgam restorations.

This study evaluated in vitro the effectiveness of resistance/retention grooves in box-only (approximal slot) class 2 preparations. Forty-eight sound, caries-free maxillary premolars were distributed equally into four groups of 12 teeth based on faciolingual dimensions. Teeth were mounted vertically, and class 2 mesio-occlusal slot preparations were cut in each tooth. Resistance/retention grooves were placed in three of the four groups with a #1/4 round bur to a depth of 0.3-0.5 mm. Teeth were restored with amalgam and positioned 13.5 degrees from vertical; an area was flattened on each amalgam marginal ridge, and the flattened areas were loaded to failure using an Instron with a rectangular flat-ended rod at a cross-head speed of 1 mm/min. Mean load (SD) to failure of the group using "conventional" grooves extending in dentin from the gingival floor occlusally to near the occlusal DEJ was 196N (46N). For long grooves extending from the gingival floor to the occlusal surface, the mean failure load was 169N (58N). Slot restorations with short resistance/retention grooves or points (0.5-1.0 mm) just gingival to the occlusal DEJ had a mean failure load of 132N (44N). Slot restorations with no grooves had a mean failure load of 69N (46N). ANOVA and Student-Newman-Keuls tests were used for analysis. The no-groove group provided significantly less (P < 0.01) resistance than any group with grooves. Approximal slot restorations with "conventional" grooves were significantly more resistant (P < 0.01) than those with short grooves but were not significantly more resistant than those with long grooves.

Analysis of Variance↗
PubMed1993

Maxilla vs mandible: why use HA?

Various studies have shown that noncoated, metallic screw-type implants have been highly successful in types 1, 2, and 3 bone. However, in type 4 bone, such as that found in the maxilla, these implants have not been as successful. In the maxilla, HA-coated implants have shown better results than noncoated implants, particularly with regard to bone-to-implant contact, shear strength, and fixation. The author therefore concludes that the HA-coated implant may have better long-term success when shorter implants are needed, and when treating patients with poor, low density, and cancellous bone.

Animals↗
PubMed1993

Occlusal force and mandibular movements in patients with removable overdentures and fixed prostheses supported by implants in the maxilla.

Thirteen patients with complete dentures in the maxilla were treated with implants to support a removable bar-retained overdenture for 1 year. Thereafter, the patients were provided with fixed prostheses and were followed up for another year. Maximal occlusal force and mandibular movements were recorded with and without the bar supporting the denture and then during the subsequent year with fixed prostheses. Significant changes in occlusal force capacity and mandibular movements were observed when the bar was removed. Less obvious functional changes were found when the fixed prostheses were placed, with the exception of occlusal force levels, which increased significantly over time.

Aged↗