Clinical evaluation of posterior zirconia-based and porcelain-fused-to-metal crowns with a vertical preparation technique: an up to 5-year retrospective cohort study.
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To evaluate the clinical conditions of single-unit posterior restorations on teeth prepared without finishing line, after 5.6 years of clinical service.Keywords:
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Gingival recession
Posterior teeth
Objective To observe the clinical effect of post-core-crown restored abutment tooth in removable partial denture. Methods 12 patients with residual root (crown) abutment in removable partial denture were restored with post-core-crown. With clinical follow-up,the effect was evaluated by subject sense,oral and X-rays examination. Results All patients were followed up for 1～3 years. All the prostheses had a good appearance on comfort,mastication,healthy dental tissue and periodontium. Conclusion The post-core-crown restoration on abutment tooth in removable partial denture is a practical method. It is worth application.
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Abstract Objective This article introduced a modified method to fabricate an individualized abutment‐crown integrated provisional restoration for single‐tooth implant restoration in the esthetic zone, which created a satisfactory peri‐implant soft tissue architecture. Clinical considerations Three months after the implant placement, the individualized abutment‐crown integrated provisional restoration was designed and fabricated in the laboratory, by referring to the profile of natural contra‐lateral tooth digitally, and seated on the implant afterwards. The peri‐implant soft tissue architecture was evaluated and the Pink Esthetic Score (PES) was recorded. The provisional restoration stayed on the implant for 3 months until the individualized definitive ceramic abutment and crown were fixed on the implant. Conclusions This protocol provided an alternative solution for shaping the peri‐implant soft tissue morphology in the esthetic zone by using an individualized abutment‐crown integrated provisional restoration and showed promising effect on the esthetics of anterior single‐tooth implant restoration. Clinical significance The individualized abutment‐crown integrated provisional restoration whose emergence profile mirroring that of the natural contra‐lateral tooth, was designed with the help of computer‐aided design‐manufacture (CAD/CAM). It may help shaping the peri‐implant soft tissue in the esthetic zone with merits of saving amount of hand labor of technicians as well as clinicians, and reducing the visits of patients.
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The ultimate objective of the fabrication of a partial prosthetic appliance is the preservation of the remaining teeth while lost function is being restored. Double crown is an effective type of retainer that provides retention, support and a splinting action between multiple abutment teeth. Double crowns with clearance fit are used to retain tooth-mucosa and implant-supported removable partial dentures (RPDs). Retention is achieved by either functional molded borders or additional attachment. The double crown system retains dentures more effectively than do conventional clasp-retained RPDs, and also shows more favorable transmission of occlusal loading to the long axis of the abutment teeth. This case report will highlight the use of Marburg double crown system in the treatment of partially edentulous patients.
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Objective:To observe ERA crown cover attachment of the long-term effects of teeth to determine ERA crown cover attachment abutment the scope of choice.Method: 20 cases of dentition defect Kennedy Ⅰ patients required abutment Ⅰ degrees and above are loose,X-ray film showed varying degrees widened.The cut-off crown,root canal therapy,periodontal treatment,the use of ERA crown cover attachment repair,then order the patients every six months or one year to reexamine.Result: After 6 months to 4 years follow-up observation,19 cases of success,one case of failure.Conclusion: ERA crown cover attachment abutment choice than to the scope of conventional dentures and denture fixed and will not cause short-term abutment alveolar damage,and the abutment of a certain protective effect,but with a history of periodontal disease patients,loosening of teeth over Ⅱdegree inappropriate choice for the abutment.
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One of the most significant challenges in contemporary dental implant therapy involves managing the transition of the restoration from the implant through the soft tissues by means of an abutment. This article presents a practical technique to visualize if the selection of a custom-made abutment would be favored over the use of a manufactured standard abutment to receive crown restoration supported by a dental implant.
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Purpose:There are two ways in the prosthodontics of fixed partial implant treatment: screw-retained crown and cement-retained crown.When coming with stress distribution,aesthetic and passive fit of the crown,cement-retained crown establish superiority over screw-retained crown.While it happens to a damaged crown which need to repair or a wrong implant site,screw-retained crown is better than cement-retained crown to be the first choice and it avoid gingivitis which induced by remanet cement.Conventional screw-retained crown procedure is that fit abutment on implant first,and then tight abutment screw with the crown.It would loosening in function,resulting in gingiva recess and horizontal food impaction.Integrated abutment crown(IAC) is the whole body of abutment and crown which fixed on implant with screw on occlusal surface.The aim of the present study was to evaluate the soft tissue management around the implant-supported crown using IAC restoration at the posterior region.Materials and Methods: IAC was restored by two ways:one is the abutment was casted with the crown simultaneity and then screw-retained;the other is abutment and crown were casted respectively,cement them,remove remanet cement and finally retained by screw.And also there is two ways to manage soft tissue:one is using temporary crown to shape soft tissue progressively,and then take the customed impression to fabricate the final crown;the other is try- in the IAC and was retained by screw with managing the soft tissue contemporary.Porcelain or polymer ceramic was fused to the metal of crown.29 patients underwent implant surgery and 48 implants were inserted and restored.19 implants of 14 patients use the ITI system,while 29 implants of 15 patients use the OSSTEM GS system.When managing the soft tissue,only 2 restorations of ITI and 3 restorations of GS use the former program.Prosthodontic procedures contain the radiograthic confirmation of abutment placement uniformly.Follow-up time after operation was 6 months to 1 year to evaluate losseness of IAC and shape and health of soft tissue.Results: All the patients with those two prosthetic plans come to the same destination-all of them with IAC have not looseness on function and use IAC directly could manage ideal gingiva margin and papulla height.It avoid gingivitis induced by remanet cement and horizontal food impaction.One patient who has the wrong implant site was restored by IAC successfully.The screw hole of occlusal surface is filled with polymer ceramic which come up to aesthetic prosthodontics.Conclusion: 1) At the posterior region,IAC restoration could manage the soft tissue to reduce the horizontal food impaction which last for a long time in implant treatment.2) IAC could has the satisfied results while at a wrong implant site or low occlusion.3) IAC allows for shorter post-treatment waiting time,provideing less additional consultment,avoiding more cost and inconvenience of patients.4)IAC is better for the health of soft tissue and repair of crown,so it is that can be a better choice in regions where have advanced requirement for health and function.
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The purpose of this article is to classify the types of telescopic prostheses that protect natural teeth as an alternative to traditional removable prostheses, and to explain their advantages, disadvantages, indications and clinical significance in order to minimize the problems of removable dentures. Telescopic prostheses consist of an inner (primary) crown permanently cemented to an abutment and an outer (secondary) crown attached to the prosthesis. Primary crowns protect the abutment from bruises and thermal irritation, and also provide retention and stabilization of the secondary crown. The secondary crown combines the primary crown with the prosthesis to form a telescopic unit, providing prosthetic retention and stability. Â
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Prosthodontics
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Removable partial denture
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Objective To investigate the indications and the skill of full ceramic abutment and crown for implant in clinic.Methods Twenty five pieces of full ceramic abutments and crowns for 25 implants were made and used for 21 patients.All restorations were followed up loose and broken for 2-24months.Results None was broken during observation,only one showed the center screw loosen.The effect of color of full ceramic abutment and crown for implants was excellent.Conclusion Full ceramic abutment and crown for implants could be used in clinic.
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OBJECTIVE To get aesthetic implant-supported restorations by means of the all-ceramic crown fused to small-size titanium abutment and evaluate the quality of the restorations. METHODS A small-size titanium abutment that had extremely thin circumferential collar and axial wall was fabricated, while a Cercon all-ceramic crown made with computer aided manufacture (CAM). The crown was fused to the abutment by firing the opaque porcelain. A total of 6 restorations in 5 patients were installed and assessed according to the California Dental Association (CDA) quality evaluation system. RESULTS All the restorations were fabricated well and ranked in clinic evaluation excellent for surface, anatomical form, marginal quality, and color at baseline and one year after insertion, respectively. CONCLUSIONS The restoration of all-ceramic crown fused to titanium small-size abutment is a new aesthetic alternative for the implant-supported restoration.
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