Clinical trial NCT01997827: Minimal Invasive Rehabilitation of Tooth Loss in the Anterior Segment
Official title: Clinical Performance of Porcelain-fused-to-metal and All-ceramic Resin-bonded Fixed Dental Prostheses in the Anterior Segment - a Randomized Controlled Pilot Study.
Study type: INTERVENTIONAL
Overall status: WITHDRAWN
Phase: NA
Conditions: Unsatisfactory or Defective Restoration of Tooth
Lead sponsor: University Hospital Heidelberg
Sponsor class: OTHER
First posted: 2013-11-28
Enrollment: 0
Sex: ALL
Minimum age (years): 18
Maximum age (years): 89
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Allocation: RANDOMIZED
Intervention model: PARALLEL
Primary purpose: TREATMENT

Brief summary: Tooth loss can be addressed by different rehabilitative strategies. Implant-supported crowns and conventional bridges (fixed dental prostheses \[FDPs\]) are well established treatment alternatives. Implant therapy is sometimes impossible, however, because of patient-related risk factors or economic issues. In such cases therapy with an FDP requires extensive removal of tooth structure to provide enough space for the restoration and to ensure mechanical retention if the abutment teeth are sound. Alternatives for rehabilitation requiring minor or no preparation of the anchoring teeth are desirable. Resin-bonded bridges meet this demand for minimal invasiveness and have been used clinically successfully. Sometimes, however, patients choose a conventional FDP over a resin-bonded one (RBFDP) for esthetic reasons since the adhesive wings, which are traditionally made of a cobalt-chromium alloy, might be exposed while speaking or smiling or account for a colour change of the abutment teeth. Such patients profit from an all-ceramic RBFDP. Today, the clinical performance of metal-based and all-ceramic RBFDPs has not yet been evaluated under randomized controlled conditions. The aim of this pilot study is to calculate the sample size that allows us to accept the hypothesis that metal- and all-ceramic RBFDPs are similar regarding their clinical performance with adequate statistical power.


Eligibility criteria: Inclusion Criteria:

* missing central or lateral incisor
* regular patient of the department of prosthodontics of the university hospital of heidelberg
* willingness to return for recall examinations on a regular basis
* written informed consent
* abutment teeth are vital or sufficiently endodontically treated
* abutment teeth are periodontally stable
* abutment teeth have only little or no defects of the hardsubstances

Exclusion Criteria:

* Pregnancy or breastfeeding
* medically compromised condition not allowing for standard dental treatment
* Patient is not able to give written informed consent
* alcohol or drug abuse
* positive bruxism and parafunctions questionaire
* Bite-Strip \> 2
* Attrition Score \> 3
* deep bite (Angle class II/2)
* abutment tooth height \< 4mm
* untreated symptomatic periodontal or endodontic lesions
* abutment tooth mobility \> grade I
* known allergies to materials used in this study
* poor dental hygiene
* planned change of residency

Primary outcomes:
measure: Success
timeFrame: 12 months
Secondary outcomes:
measure: Color change of the abutment teeth
timeFrame: before tooth preparation, try-in of the framework, 1 week after cementation
Other outcomes:
Locations:
city: Heidelberg
country: Germany
facility: Department of Prosthodontics, University Hospital Heidelberg, University of Heidelberg
state: Baden-Württemberg
Study officials:
affiliation: Department of Prosthodontics, University Hospital Heidelberg, University of Heidelberg
name: Wolfgang Bömicke, Dr. med. dent.
role: PRINCIPAL_INVESTIGATOR
References: