Abstract BOOK SIAART

INTRODUCTION. Dental injury occurres in 0.06 - 0.13 % of general anesthesia procedures re- quiring endotracheal intubation, and it is still a reason of complaint against anesthetists. Maxil- lary central incisors are the most commonly teeth injured.1 In our center claims related to teeth damage after intubation ended with a total reimbursement of 13.000 Euros (2014-2015) and 5 patients (2014 to June 2016) were admitted for cares in Prosthodontics Implant dentistry dept. Dental School - Turin. BUCX et al.2 used a strain gauge based sensor between handle and blade of the laryngoscope to measure forces applied on the maxillary incisors to show that during routine laryngoscopy great forces are exerted on the maxillary incisor teeth with no differences based on the operator experience. OBJECTIVES.The aim of this study is to measure of the forces applied on teeth using a direct laryngoscope or a McGRATH® videolaringoscope. Many authors described how lower force on soft tissue could be applied using a VLS (GlideScope) instead of a standard laryngoscope (P=0.05).3, but no studies have ever been performed involving the use of a force sensor directly applied on teeth. The aim of our study is to measure the forces applied on teeth after the application of a cus- tomized bite (2 mm dental bite) applied on the manikin. Anesthesiologists and anesthesia residents from “Città della Salute e della Scienza”,Turin will be asked to perform 3 intubations using the standard intubation system, and other 3 using McGRATH® videolaringoscope in order to test the intubation forces exerted

Management of a Malpractice Dental Implant Case in a Patient with History of Oral Bisphosphonates Intake: A Case Report and Narrative Review of Recent Findings

The present article aims to describe the management of a malpractice dental implant case in a patient with a history of oral bisphosphonates (BF) intake (alendronic acid every 15 days for 20 years) and to perform a narrative review of recently published articles (2019–2023) on the topic. A female patient rehabilitated with 18 nails in the mandible 20 years ago underwent two surgeries; the first one included the explantation of the nails; the second one included the insertion of two implants in the anterior region. At the last follow-up (21 months from the first surgery and 15 months from the second one) no complications nor episodes of bisphosphonate-related osteonecrosis of the jaw (BRONJ) were highlighted. Furthermore, 12 recent articles on the topic were reported and a narrative review was performed. Based on the narrative analysis, the topic related to dental implants in patients with BF intake seems to remain controversial. Most of the findings highlight how the evidence on both the safety of the treatment and the possibility to foresee the risk of onset based on preoperative factors seem to be scarce. The case described in the present article did not report any complications nor episodes of BRONJ. However, evidence from a single case report is scarce and more clinical trials are required to deepen the knowledge on the topic

Assessment of Preload Loss after Cyclic Loading in the OT Bridge System in an “All-on-Four” Rehabilitation Model in the Absence of One and Two Prosthesis Screws

The aim of this study was to evaluate the stability of prosthetic screws after applying cyclic loadings in an “all-on-four” rehabilitation model with the OT Bridge system. The model was tested both with and without anterior screws. Four implant analogues following the “all-on-four” concept were inserted in an edentulous mandibular resin model. An OT Bridge system with a Cr–Co prosthetic framework was fabricated. Depending on the presence or absence of one or two anterior screws on the implant analogues, three groups were created, i.e., Gr.1: three tightening screws, Gr.2: two tightening screws, Control Group: four tightening screws. Each single group underwent subsequent 400,000 cyclic loads, simulating approximately a year of chewing by using a dynamometer machine. This cycle was repeated five times for each group, and preload loss values were evaluated on each prosthetic screw after each cycle. All the data obtained were analyzed by one-way ANOVA and Student’s t-test. No statistically significant differences after intragroup analysis were found. A statistically significant difference within the Gr.1 between the screws in positions 33 and 36, equal to 15.2% (p-value = 0.0176), was found. The OT Bridge seems a useful system to maintain the retention of a prosthesis during mechanical stress conditions even in the absence of one screw in an “all-on-four” rehabilitation. This could represent a good solution to solve the esthetic problem of the screw buccal access hole for fixed solutions

Preliminary evaluation of the utility of optical coherence tomography in detecting structural changes during photobiomodulation treatment in patients with atrophic-erosive oral lichen planus

INTRODUCTION: Oral lichen planus (OLP) is a common oral inflammatory condition. Against symptomatic atrophic-erosive OLP, topical steroids, or photobiomodulation (PBM) are deployed. Optical coherence tomography (OCT) provides a real-time, non-invasive, tissue investigation. Aim of this study was to evaluate modifications of OCT pattern in patients with painful atrophic-erosive OLP, before and after treatment with PBM, comparing those results with patients treated with topical steroid. METHODS: Two groups of 20 OLP patients were evaluated. Group A underwent two daily application of 0.05% clobetasol propionate for 8 weeks; group B was treated with eight weekly PBM sessions using a 980/645 nm diode laser. OCT scans were performed before and after treatment, and six months after end of the proposed protocol. Changes of width of stratified epithelium (EP) and lamina propria (LP) were quantified. RESULTS: After 8-weeks, both groups experienced a significant increase of EP width (p  0.05). After six months, significant increase of EP width remained only in group B (p = 0.01), with no significant decrease of LP mean width in both groups (p > 0.05). CONCLUSIONS: Increase of EP and decrease of LP might be explained as consequence of clobetasol and PBM ability to promote epithelial healing, and to reduce interface inflammation. When investigated with OCT, clobetasol appears to provide more significant short-term structural changes, whereas PBM might guarantee long-term alterations

Working length transfer in the endodontic clinical practice: A comparative study

8The present paper evaluated the accuracy of two different methods for transferring working length (WL) between manual endodontic instruments and nickel–titanium (NiTi) shaping files. Thirty root canals of extracted permanent teeth were used. Root canals were divided according to canal length (CL) and canal curvature (CC). The reference cusp and the root end were flattened to provide reproducible and accurate measurements. During shaping, the WL measurements were obtained with manual k-files (KF) and transferred to WaveOne (W1) NiTi reciprocating files using the traditional method with the endodontic ruler (method I) and an alternative clinical procedure based on the comparison of the instruments side by side from tip to shank (method II). For each file and each tested method, two measures were taken by two examiners using Rhino (ver. 4.0, McNeel, Seattle, WA, USA) software for a total of 360 (30 × 3 × 2 × 2) measures. Analysis of variance was performed by taking the difference in length (Delta WL, DWL) between files used for the same canal. The difference between methods I and II for WL transfer was found to be statistically significant (df = 1; F = 71.52; p < 0.001). The DWL absolute values obtained with method II were found to be closer to 0 mm (i.e., same length as corresponding KF) than those obtained with method I. Both CL (df = 2; F = 1.27; p = 0.300) and CC (df = 1; F = 2.22; p = 0.149) did not significantly influence WL measurements. With respect to WL transfer, method II seemed to better preserve the correct WL transfer between instruments during the clinical endodontic procedures.openopenMario Alovisi; Mario Dioguardi; Massimo Carossa; Giuseppe Troiano; Maria Chiara Domini; Davide Salvatore Paolino; Giorgio Chiandussi; Elio BeruttiAlovisi, Mario; Dioguardi, Mario; Carossa, Massimo; Troiano, Giuseppe; Chiara Domini, Maria; Paolino, DAVIDE SALVATORE; Chiandussi, Giorgio; Berutti, Eli