Seema G

Genetics is the study and understanding of the phenomena of heredity and variation. A large number of genes are associated with many systemic conditions. Periodontitis is inflammatory condition of periodontium. It is considered being a multifactorial disease. It has been proven that genetic factors impair inflammatory and immune responses during periodontal diseases. Focusing on genetic factors, currently variants in at least 65 genes have been suggested as being associated with periodontitis based on genome‐wide association studies and candidate gene case control studies. It is important to understand the significance of genetics in periodontics.

Over the past three decades, implants have emerged as a reliable means of replacing partially and completely edentulous ridges. Since then attempts are being made to enhance osseointegration at the bone-implant interface. Just as the bones, implant surface plays equally important role in the process of osseointegration. The increasing research on implant surface modification has lead to a drastic change from macrotopographic to nanotopographic level of surface modification. Recent advances focus on the biomimetic alteration of the implant surface. All these advancements called for a textbook on implant surface modification. The main idea behind working on this book is to help undergraduate and postgraduate understand the topic in a much simpler way and also to update them with the day to day advancements happening relating to this topic. This book concises the results and information based on previous trials and reviews and encompasses a comprehensive coverage on various surface modification modatilities and provides an in-depth data regarding the past, present, and future of implant surface modificatons.

Einzelne parodontale L sionen beherbergen Millionen von genomischen Kopien von humanen Herpesviren, humanen Cytomegaloviren, Epstein-Barr-Viren, humanen Papillomaviren, humanen Immunschw cheviren, Hepatitis B und C Viren. Von ihnen sind EBV und CMV die am h ufigsten untersuchten Viren in der Parodontologie und es wurden mehr als 1 Million Genomkopien an einer einzigen Infektionsstelle identifiziert. Es wird angenommen, dass der gingivale Sulkus oder die parodontale Tasche als Reservoir zwischen den Perioden des Wiederauftretens der herpetischen Infektionen dient. Adh renz ist f r die Etablierung von Bakterienpopulationen auf Schleimhautoberfl chen erforderlich, ein wichtiger erster Schritt bei der Infektion, und eine erh hte Anf lligkeit f r bakterielle Adh renz kann die Entstehung von Pathogenen unterst tzen. Viren k nnen in diesem Prozess eine wichtige Rolle spielen, indem sie die Zellen f r bakterielle Infektionen vorkonditionieren. M glicherweise ist die Parodontitis das Ergebnis umfangreicher und teilweise gegens tzlicher Immunantworten gegen virale und bakterielle Kombinationsinfektionen.

Le recenti ricerche microbiologiche sulla malattia parodontale si sono concentrate sul possibile coinvolgimento dei virus umani nell'eziologia e nella patogenesi delle malattie parodontali distruttive. Le singole lesioni parodontali ospitano milioni di copie genomiche di Herpesvirus umani, Cytomegalovirus umani, Epstein-Barr Virus, Papillomavirus umani, Human Immunodeficiency Virus, Hepatitis B e C Virus. Tra questi EBV e CMV sono i virus pi comunemente ricercati in parodontologia e pi di 1 milione di copie del genoma sono state identificate in un singolo sito di infezione. Il solco gengivale o la tasca parodontale stato proposto per agire come un serbatoio tra i periodi di ricorrenza delle infezioni erpetiche. L'aderenza necessaria per l'insediamento di popolazioni batteriche sulle superfici mucosali, un primo passo importante nell'infezione e una maggiore suscettibilit all'aderenza batterica pu favorire l'emergere di agenti patogeni. I virus possono giocare un ruolo importante in questo processo precondizionando le cellule per le infezioni batteriche. Pu essere che la parodontite sia il risultato di risposte immunitarie estese e in parte opposte contro le infezioni combinate virali e batteriche.

Recent microbiological researches on periodontal disease have focused on the possible involvement of human viruses in the etiology and pathogenesis of destructive periodontal diseases. Individual periodontal lesions harbor millions of genomic copies of Human Herpesviruses, Human Cytomegalovirus, Epstein-Barr Virus, Human Papillomavirus, Human Immunodeficiency Virus, Hepatitis B And C Virus. Out of them EBV and CMV are the most commonly researched viruses in periodontology and more than 1 million genome copies have been identified at a single site of infection. The gingival sulcus or periodontal pocket has been proposed to act as a reservoir between periods of recurrence of the herpetic infections. Adherence is required for the establishment of bacterial populations on mucosal surfaces, an important first step in infection and an increased susceptibility to bacterial adherence may support the emergence of pathogens. Viruses can play an important role in this process by pre-conditioning cells for bacterial infections. It may be that periodontitis is the result of extensive and partly opposing immune responses against viral- bacterial combined infections.