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19 pages, 237 KiB

Open AccessArticle

The Peri-Implant and Periodontal Microbiota in Patients with and without Clinical Signs of Inflammation

by Meike Luise Jakobi¹, Sascha Nico Stumpp², Meike Stiesch², Jörg Eberhard² and Wieland Heuer^2,*

¹ Private Dental Practice, Hildesheim 31134, Germany

² Department of Prosthetic Dentistry and Biomedical Materials Science, Hannover Medical School, Carl-Neuberg-Strasse 1, Hannover 30625, Germany

Dent. J. 2015, 3(2), 24-42; https://doi.org/10.3390/dj3020024 - 31 Mar 2015

Cited by 16 | Viewed by 7591

Abstract

Late implant failures, caused by the inflammation of surrounding tissues are a problem in implant dentistry. The path of bacterial transmission from teeth to implants is not completely understood. Therefore, the purpose of this study was to analyze intraindividual bacterial transmission characterizing subgingival microbiomes in teeth and implants, both in healthy subjects and in those with signs of periodontitis or peri-implantitis. Samples of peri-implant and dental sulcus fluid were collected. To identify the predominant microbiota, amplified fragments of bacterial 16S rRNA gene were separated by single strand conformation polymorphism analysis, sequenced and taxonomically classified. A total of 25 different predominant genera were found in the diseased group and 14 genera in the healthy group. Species richness did not differ significantly between implants, neighboring teeth and teeth with largest probing depth in the diseased group. Additionally, no differences between teeth and implants in the healthy group were detected. In contrast, microbial diversity varied between the different sampling points. Species richness is similar in healthy and diseased sites, but the composition of the bacterial community differed within the individual subjects. The underlying analyses strongly suggest that complete transmission from neighboring teeth to implants is unlikely. Full article

12 pages, 1197 KiB

Open AccessArticle

Effect of Long-Term Consumption of Lactobacillus paracasei SD1 on Reducing Mutans streptococci and Caries Risk: A Randomized Placebo-Controlled Trial

by Rawee Teanpaisan^1,*, Supatcharin Piwat², Sukanya Tianviwat², Benchamat Sophatha¹ and Thanyanan Kampoo¹

¹ Common Oral Diseases and Epidemiology Research Center and the Department of Stomatology, Faculty of Dentistry, Prince of Songkla University, Hat-Yai 90112, Thailand

² Common Oral Diseases and Epidemiology Research Center and the Department of Preventive Dentistry, Faculty of Dentistry, Prince of Songkla University, Hat-Yai 90112, Thailand

Dent. J. 2015, 3(2), 43-54; https://doi.org/10.3390/dj3020043 - 1 Apr 2015

Cited by 36 | Viewed by 9800

Abstract

Background: A previous study revealed Lactobacillus paracasei SD1, a probiotic strain, could reduce mutans streptococci (MS). The aim of this study was to evaluate the long-term effects of L. paracasei SD1 on the colonization of MS, and whether caries lesions developed. Methods: After informed consent, 122 children were recruited and randomly assigned to the probiotic or control groups. The probiotic group received milk-powder containing L. paracasei SD1 and the control group received standard milk-powder once daily for six months. Salivary MS and lactobacilli were enumerated using differential culture at baseline and at three-month intervals for 12 months. The persistence of L. paracasei SD1 was investigated using AP-PCR for DNA-fingerprinting. Oral health was examined at baseline and at the end of the study according to WHO criteria. Results: The long-term consumption could prolong colonization of L. paracasei SD1. Significantly reduced MS counts and increased lactobacilli levels were found among children in the probiotic group. There were less caries lesions in the probiotic group at the end of the study. A significant reduction of the development of new caries lesions (4.5 times) was observed in the high caries risk group but not in the low caries risk group. Conclusions: Results demonstrate that the long-term daily ingestion of the human-derived probiotic L. paracasei SD1 significantly reduces the number of MS and caries risk in the high caries group. Full article

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12 pages, 1478 KiB

Open AccessArticle

Randomized Clinical Investigation of Titanium Implants with and without Platform Switching: Six Months’ Radiographic and Clinical Outcome

by Roberto Rossi^1,*, Diego Capri^2,†, Emanuele Risciotti^3,† and Paul Zeman⁴

¹ Studio Dentistico, Torre San Vincenzo 2, Genova 16121, Italy

² Cobe Dental, Via Bazzanese 32/4, Casalecchio di Reno, Bologna 40033, Italy

³ Odontoiatria, Protesista Dentale, Corso EUROPA, 10, Milano 20122, Italy

⁴ Thommen Medical AG, Neckarsulmstrasse 28, Grenchen CH-2540, Switzerland

^† These authors contributed equally to this work.

Dent. J. 2015, 3(2), 55-66; https://doi.org/10.3390/dj3020055 - 23 Apr 2015

Cited by 2 | Viewed by 7513

Abstract

The aim of this study was to obtain a randomized, clinical and radiological comparison of implants with and without platform switching (PFS). The two compared titanium implant types differed only in the microgap position: test (PFS) or control (StE, no PFS). All implants were inserted in posterior regions and followed up for six months after abutment connection (AC). Twenty one patients with 21 PFS and 18 StE implants completed the six-month evaluation. No implant failed. One complication (exposed cap screw) was reported at AC. No statistically significant difference was observed between the marginal bone level of PFS and StE implants. Their bone level stabilized approximately 1 mm below the microgap. Based on the outcome of this short-term study with a limited number of patients, it seems unlikely that the optimal clinical and radiological outcome obtained with the tested standard implant (no PFS) can be improved by introducing an inward microgap shift (PFS). Full article

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Dent. J., Volume 3, Issue 2 (June 2015) – 4 articles , Pages 24-76

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