Randomized controlled clinical study of veneered zirconia abutments for single implant crowns: Clinical, histological, and microbiological outcomes

Autor: Irena Sailer, Daniel S. Thoma, Alfonso Gil, Sven Mühlemann, Ronald E. Jung, Christoph H. F. Hämmerle
Přispěvatelé: University of Zurich, Thoma, Daniel S
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Male
medicine.medical_treatment
Dentistry
Dental Cements
Dental Abutments
02 engineering and technology
Single-Tooth
Dental Veneers/adverse effects
0302 clinical medicine
Dental Implants
Single-Tooth
80 and over
Tannerella forsythia
Aged
80 and over
Periapical Tissue/microbiology/pathology
biology
Crowns
3504 Oral Surgery
Periapical Tissue
Dental Plaque Index
Soft tissue
Dental Implant-Abutment Design
Middle Aged
3500 General Dentistry
ddc:617.6
Dental Veneers
surgical procedures
operative
Computer-Aided Design
Female
Oral Surgery
medicine.symptom
Periodontal Index
musculoskeletal diseases
Adult
Inflammation/etiology
0206 medical engineering
Bleeding on probing
610 Medicine & health
Crown (dentistry)
03 medical and health sciences
10068 Clinic of Reconstructive Dentistry
stomatognathic system
medicine
Humans
Dental Cements/adverse effects
General Dentistry
Aged
Dental Implants
Inflammation
business.industry
Single implant
Histology
030206 dentistry
equipment and supplies
biology.organism_classification
020601 biomedical engineering
Bacterial Load
stomatognathic diseases
Dental Abutments/adverse effects
Implant
Zirconium
business
Zdroj: Clinical Implant Dentistry and Related Research, Vol. 20, No 6 (2018) pp. 988-996
ISSN: 1523-0899
DOI: 10.5167/uzh-157783
Popis: OBJECTIVES To analyze the effect of veneering of the submucosal part of zirconia abutments and the type of retention (cemented vs screw-retained) on clinical, microbiological, and histological outcomes of single-tooth implant crowns. MATERIAL AND METHODS A total of 44 patients with a single missing tooth to be replaced by an implant in the anterior region participated in the study. Implants were randomly assigned to receive zirconia-based CAD/CAM reconstructions using either one of four treatment modalities: cement-retained with submucosal veneering (CR-P), cement-retained without submucosal veneering (CR-W), screw-retained with submucosal veneering (SR-P), and screw-retained without submucosal veneering (SR-W). Clinical parameters were assessed at baseline (after crown insertion), at 6 and 12 months. Histological and microbiological analyses were performed at 6 months. Descriptive statistics and the Kruskal-Wallis test were applied. RESULTS The clinical evaluation revealed, in general, stable peri-implant soft tissues with minimal differences for all measured parameters between the four groups, except for bleeding on probing with the two cemented groups exhibiting higher values at 12 months (35.0% ± 26.5% for CR-W and 25.0% ± 38.8% for CR-P versus 13.1 ± 14.8 for SR-W and 13.0 ± 18.2 for SR-P). The descriptive and semi-quantitative histology showed a trend for a higher inflammatory reaction in the two cemented (a medium to high number of inflammatory cells) compared to the screw-retained groups (low number of inflammatory cells) at 6 months. The microbiological test demonstrated low bacterial counts and a similar distribution in between the groups except for two species (Tannerella forsythia and Peptostreptococcus micros) that were found in higher counts in the cemented groups at 6 months. CONCLUSION Submucosal veneering of zirconia abutments did not negatively affect the health of the peri-implant tissues. The cemented groups, though, did show a clinical and histological trend to higher levels of inflammation.
Databáze: OpenAIRE
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