Buergers, Ralf

[["dc.bibliographiccitation.firstpage","579"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Clinical Oral Investigations"],["dc.bibliographiccitation.lastpage","587"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Rödiger, Matthias"],["dc.contributor.author","Heinitz, Arthur"],["dc.contributor.author","Bürgers, Ralf"],["dc.contributor.author","Rinke, Sven"],["dc.date.accessioned","2018-10-09T07:49:18Z"],["dc.date.available","2018-10-09T07:49:18Z"],["dc.date.issued","2017-03"],["dc.description.abstract","This study focused on the clinical investigation of the internal and marginal fit of CAD/CAM-fabricated zirconia single crowns produced via conventional and digital impression techniques.In a private practice, 20 molar teeth, one from each of 20 patients, were prepared with a circumferential 1.0-mm deep chamfer and an occlusal reduction of 1.5 mm. Conventional impression (CI) taking with a polyvinylsiloxane material (Aquasil Monophase + Aquasil XLV; Dentsply, Konstanz, Germany) and intraoral scanning (IS) (Cara TRIOS; Heraeus, Hanau, Germany) of each of the preparations was performed, and then two respective zirconia copings per tooth were produced (20 crowns per group). The marginal and internal fit of the restorations was evaluated employing a replica technique. For statistical analysis, a pairwise comparison (Wilcoxon rank test) was performed. Zirconia single crowns produced with the IS technique revealed a statistically significant better precision of internal fit only in specific areas (chamfer area/occlusal area). The evaluation of marginal fit showed no significant differences between the two groups. All restorations of both groups offered internal and marginal gaps within the postulated clinical tolerance ranges. CAD/CAM-fabricated zirconia single crowns produced with CI and IS techniques offer adequate marginal and internal precision. However, the IS technique provides lower internal gaps in some specific areas. The clinical precision of fit of restorations produced with a CI and an IS technique appeared to be equivalent. Therefore, the IS technique can be rated as a suitable alternative for the manufacturing of single crowns."],["dc.fs.pkfprnr","67999"],["dc.identifier.doi","10.1007/s00784-016-1924-y"],["dc.identifier.fs","626847"],["dc.identifier.pmid","27469102"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/15900"],["dc.language.iso","en"],["dc.notes.status","final"],["dc.relation.eissn","1436-3771"],["dc.title","Fitting accuracy of zirconia single crowns produced via digital and conventional impressions - a clinical comparative study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","136"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Oral Rehabilitation"],["dc.bibliographiccitation.lastpage","144"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","Rinke, Sven"],["dc.contributor.author","Kramer, Katharina"],["dc.contributor.author","Buergers, Ralf"],["dc.contributor.author","Roediger, Matthias"],["dc.date.accessioned","2018-11-07T10:18:59Z"],["dc.date.available","2018-11-07T10:18:59Z"],["dc.date.issued","2016"],["dc.description.abstract","This practice-based study evaluates the survival and success of conventionally luted metal-ceramic and zirconia molar crowns fabricated by using a prolonged cooling period for the veneering porcelain. Fifty-three patients were treated from 07/2008 to 07/2009 with either metal-ceramic crowns (MCC) or zirconia crowns (ZC). Forty-five patients (26 female) with 91 restorations (obser-vational period: 640 +/- 48 months) participated in a clinical follow-up examination and were included in the study. Estimated cumulative survival (ECSv), success (ECSc) and veneering ceramic success (ECVCSc) were calculated (Kaplan-Meier) and analysed by the crown fabrication technique and the position of the restoration (Cox regression model) (P < 005). Five complete failures (MCC: 2, ZC: 3) were recorded (5-year ECSv: MCC: 976%, (95% confidence interval (95%-CI): [93%; 100%]/ZC: 940%, (95%-CI): [87%; 100%]). Of the MCCs (n = 41), 850%, [95%-CI: (77%; 96%)] remained event-free, whereas the ECSc for the ZCs (n = 50) was 743% (95%-CI): [61%; 87%]. No significant differences in ECSv (P = 051), ECSc (P = 043) and ECVCSc (P = 036) were detected between the two fabrication techniques. Restorations placed on terminal abutments (n = 44) demonstrated a significantly lower ECVCSc (P = 0035), (5-year VCF-rate: 148%) than crowns placed on tooth-neighboured abutments (n = 47), (5-year VCF-rate: 43%). In the present study, zirconia molar crowns demonstrated a 5-year ECSv, ECSc and ECVCSc comparable to MCCs. Irrespective of the fabrication technique, crowns on terminal abutments bear a significantly increased risk for VCFs. Clinical investigations with an increased number of restorations are needed."],["dc.description.sponsorship","DeguDent GmbH; Dentsply DeTrey"],["dc.identifier.doi","10.1111/joor.12348"],["dc.identifier.isi","000368019700008"],["dc.identifier.pmid","26393865"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/41563"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1365-2842"],["dc.relation.issn","0305-182X"],["dc.title","A practice-based clinical evaluation of the survival and success of metal-ceramic and zirconia molar crowns: 5-year results"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","329"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","The Journal of Advanced Prosthodontics"],["dc.bibliographiccitation.lastpage","337"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Rinke, Sven"],["dc.contributor.author","Buergers, Ralf"],["dc.contributor.author","Ziebolz, Dirk"],["dc.contributor.author","Roediger, Matthias"],["dc.date.accessioned","2018-11-07T09:53:43Z"],["dc.date.available","2018-11-07T09:53:43Z"],["dc.date.issued","2015"],["dc.description.abstract","PURPOSE. This retrospective study aims at the evaluation of implant-supported overdentures (IODs) supported by ceramo-galvanic double crowns (CGDCs: zirconia primary crowns + galvano-formed secondary crown). MATERIALS AND METHODS. In a private practice, 14 patients were restored with 18 IODs (mandible: 11, maxilla: 7) retained by CGDCs on 4 - 8 implants and annually evaluated for technical and/or biological failures/complications. RESULTS. One of the 86 inserted implants failed during the healing period (cumulative survival rate (CSR) implants: 98.8%). During the prosthetic functional period (mean: 5.9 +/- 2.2 years), 1 implant demonstrated an abutment fracture (CSR-abutments: 98.2%), and one case of peri-implantitis was detected. All IODs remained in function (CSR-denture: 100%). A total of 15 technical complications required interventions to maintain function (technical complication rate: 0.178 treatments/patients/year). CONCLUSION. Considering the small sample size, the use of CGDCs for the attachment of IODs is possible without an increased risk of technical complications. However, for a final evaluation, results from a larger cohort are required."],["dc.identifier.doi","10.4047/jap.2015.7.4.329"],["dc.identifier.isi","000360420400009"],["dc.identifier.pmid","26330981"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13575"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36385"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Korean Acad Prosthodontics"],["dc.relation.issn","2005-7814"],["dc.relation.issn","2005-7806"],["dc.rights","CC BY-NC 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by-nc/3.0"],["dc.title","Clinical outcome of double crown-retained implant overdentures with zirconia primary crowns"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","233"],["dc.bibliographiccitation.issue","3"],["dc.bibliographiccitation.journal","The Journal of Advanced Prosthodontics"],["dc.bibliographiccitation.lastpage","240"],["dc.bibliographiccitation.volume","6"],["dc.contributor.author","Roediger, Matthias"],["dc.contributor.author","Rinke, Sven"],["dc.contributor.author","Ehret-Kleinau, Fenja"],["dc.contributor.author","Pohlmeyer, Franziska"],["dc.contributor.author","Lange, Katharina"],["dc.contributor.author","Buergers, Ralf"],["dc.contributor.author","Gersdorff, Nikolaus"],["dc.date.accessioned","2018-11-07T09:39:11Z"],["dc.date.available","2018-11-07T09:39:11Z"],["dc.date.issued","2014"],["dc.description.abstract","PURPOSE. To evaluate the effects of different abutment geometries in combination with varying luting agents and the effectiveness of different cleaning methods (prior to re-cementation) regarding the retentiveness of zirconia copings on implants. MATERIALS AND METHODS. Implants were embedded in resin blocks. Three groups of titanium abutments (pre-fabricated, height: 7.5 mm, taper: 5.7; customized-long, height: 6.79 mm, taper: 4.8; customized-short, height: 4.31 mm, taper: 4.8) were used for luting of CAD/CAM-fabricated zirconia copings with a semi-permanent (Telio CS) and a provisional cement (Temp Bond NE). Retention forces were evaluated using a universal testing machine. Furthermore, the influence of cleaning methods (manually, manually in combination with ultrasonic bath or sandblasting) prior to re-cementation with a provisional cement (Temp Bond NE) was investigated with the pre-fabricated titanium abutments (height: 7.5 mm, taper: 5.7) and SEM-analysis of inner surfaces of the copings was performed. Significant differences were determined via twoway ANOVA. RESULTS. Significant interactions between abutment geometry and luting agent were observed. Temp Bond NE showed the highest level of retentiveness on customized-long abutments, but was negatively affected by other abutment geometries. In contrast, luting with Telio CS demonstrated consistent results irrespective of the varying abutment geometries. Manual cleaning in combination with an ultrasonic bath was the only cleaning method tested prior to re-cementation that revealed retentiveness levels not inferior to primary cementation. CONCLUSION. No superiority for one of the two cements could be demonstrated because their influences on retentive strength are also depending on abutment geometry. Only manual cleaning in combination with an ultrasonic bath offers retentiveness levels after re-cementation comparable to those of primary luting."],["dc.identifier.doi","10.4047/jap.2014.6.3.233"],["dc.identifier.isi","000338750900012"],["dc.identifier.pmid","25006388"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/10638"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33222"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Korean Acad Prosthodontics"],["dc.relation.issn","2005-7814"],["dc.relation.issn","2005-7806"],["dc.rights","CC BY-NC 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by-nc/3.0"],["dc.title","Evaluation of removal forces of implantsupported zirconia copings depending on abutment geometry, luting agent and cleaning method during re-cementation"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","338"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","The Journal of Advanced Prosthodontics"],["dc.bibliographiccitation.lastpage","342"],["dc.bibliographiccitation.volume","7"],["dc.contributor.author","Rinke, Sven"],["dc.contributor.author","Rasing, Hajo"],["dc.contributor.author","Gersdorff, Nikolaus"],["dc.contributor.author","Buergers, Ralf"],["dc.contributor.author","Roediger, Matthias"],["dc.date.accessioned","2018-11-07T09:53:43Z"],["dc.date.available","2018-11-07T09:53:43Z"],["dc.date.issued","2015"],["dc.description.abstract","PURPOSE. This retrospective study evaluated the outcome of implant-retained overdentures (IODs) after 5-19 years of clinical function. MATERIALS AND METHODS. A retrospective analysis of patient files was performed referring to 27 patients who received 36 IODs with 3 different bar designs (group A=prefabricated round bars, n=7; group B=one-piece anterior milled bars, n=20; and group C=two bilaterally placed milled bars, n=9) in the mandible (n=24) and/or in the maxilla (n=12). The analysis focused on the survival and success rates (according to Kaplan-Meier) of the implants and prostheses. Technical complication rates for each type of restoration were analyzed and compared via one-way ANOVA and the Chi-squared test. The prevalence of peri-implantitis (radiographic bone loss >= 3.5 mm) was evaluated by digital analysis of panoramic radiographs taken postoperative (baseline) and after 5-19 years of clinical function (follow-up). RESULTS. The mean observational time was 7.3 years. The survival rates of the prostheses and implants were 100% and 97.7%, respectively. Technical complications occurred more frequently in group A (mean: 3.5 during observational time) than in the other two groups (B: 0.8; C: 1.0). However, this difference was not statistically significant (P=0.58). Peri-implantitis was diagnosed for 12.4% of the implants in 37% of the patients. CONCLUSION. Bar-retained IODs are an adequate treatment option for edentulous jaws. These restorations may exhibit high implant/prosthesis survival rates (>97%), and a limited incidence of technical complications after a mean observational period of >7 years. Nevertheless, peri-implantitis was identified as a frequent and serious biological complication for this type of reconstruction."],["dc.identifier.doi","10.4047/jap.2015.7.4.338"],["dc.identifier.isi","000360420400010"],["dc.identifier.pmid","26330982"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/13576"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/36386"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Korean Acad Prosthodontics"],["dc.relation.issn","2005-7814"],["dc.relation.issn","2005-7806"],["dc.rights","CC BY-NC 3.0"],["dc.rights.uri","https://creativecommons.org/licenses/by-nc/3.0"],["dc.title","Implant-supported overdentures with different bar designs: A retrospective evaluation after 5-19 years of clinical function"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]