Faculty Bibliography

BACKGROUND/UNASSIGNED:Numerous studies have explored the correlation of periodontal disease (PD) with the risk of lung cancers, but the findings were inconsistent. Therefore, we did a meta-analysis to ascertain the correlation of PD with the risk of incident lung cancer. METHODS/UNASSIGNED:The authors searched relevant studies in databases (PubMed, Web of Science, Scopus, Embase, and MEDLINE) till November 2020. We registered the study at the International database of Prospectively Registered Systemic Reviews under the CRD42020198119. The summary relative risk (RR) along with a 95% confidence interval (CI) was calculated using fixed-effects models. RESULTS/UNASSIGNED:< 0.01). Subgroup analysis was performed based on gender distribution, geographic location, and type of studies. CONCLUSION/UNASSIGNED:From this current evidence, PD is a potential risk factor for the development of lung cancer. The risk for incidence of lung cancer is surged twice in the patients with PD, even though age and smoking are controlled in the studies.

The International Caries Detection and Assessment System (ICDAS II) and the Caries Classification System (CCS) are caries stage description systems proposed for adoption into clinical practice. This pilot study investigated clinicians' training in and use of these systems for detection of early caries and recommendations for individual tooth treatment. Patient participants (N = 8) with a range of noncavitated lesions (CCS ranks 2 and 4 and ICDAS II ranks 2-4) identified by a team of calibrated examiners were recruited from the New York University College of Dentistry clinic. Eighteen dentists-8 from the Practitioners Engaged in Applied Research and Learning (PEARL) Network and 10 recruited from the Academy of General Dentistry-were randomly assigned to 1 of 3 groups: 5 dentists used only visual-tactile (VT) examination, 7 were trained in the ICDAS II, and 6 were trained in the CCS. Lesion stage for each tooth was determined by the ICDAS II and CCS groups, and recommended treatment was decided by all groups. Teeth were assessed both with and without radiographs. Caries was detected in 92.7% (95% CI, 88%-96%) of the teeth by dentists with CCS training, 88.8% (95% CI, 84%-92%) of the teeth by those with ICDAS II training, and 62.3% (95% CI, 55%-69%) of teeth by the VT group. Web-based training was acceptable to all dentists in the CCS group (6 of 6) but fewer of the dentists in the ICDAS II group (5 of 7). The modified CCS translated clinically to more accurate caries detection, particularly compared to detection by untrained dentists (VT group). Moreover, the CCS was more accepted than was the ICDAS II, but dentists in both groups were open to the application of these systems. Agreement on caries staging requires additional training prior to a larger validation study.

Papillon-Lefevre syndrome (PLS) is a genetically inherited disorder characterized by palmoplantar hyperkeratosis and severe early onset periodontitis. Oral symptoms begin to appear when primary teeth are in the process of erupting. A defect in the cathepsin C gene causes a dysfunction of the immune response occurring 1 to 3 times in 1 million births. Varying degrees of severity have been reported, ranging from complete edentulism at a young age to complete retention of teeth with a good prognosis.

Background: Complications from acupuncture are quite rare. Case: This report describes the case of an adult female who left an acupuncture treatment visit with a doctor as a result of unbearable pain. Six years later, on routine X-rays for dental examination, five embedded remnants of acupuncture needles were observed. Results: The patient was completely asymptomatic from the embedded needles, and did not know they were there. She did not respond to requests for further follow-up. Conclusions: Despite the retention of the needles for at least 6 years, there were no symptoms or clinical signs in this patient.

STATEMENT OF PROBLEM: The use of dental amalgam as a direct restorative material has been a subject of controversy for many years. The potential safety of amalgam has been questioned because of leakage of elements such as mercury, copper, tin, and silver. PURPOSE: This study evaluated the elemental leaching from Tytin dental amalgam placed in deionized water for 2 months. Both mercury vapor and elemental (silver, copper, tin, and mercury) analyses were performed. MATERIAL AND METHODS: Two capsules of Tytin amalgam were triturated (one for the precipitate and liquid analysis, and the other for the mercury vapor analysis) and stored in a polypropylene tube with 10 mL deionized water for 60 days at room temperature. The amalgam pellet then was removed and rinsed with deionized water. The resulting liquid was separated from a precipitate, and 2 separate analyses were run: one on the liquid without any precipitate and another on the precipitate. Elemental analyses for copper (Cu), tin (Sn), mercury (Hg), and silver (Ag) were determined by inductively coupled plasma-emission spectroscopy with a Perkin-Elmer P2000 spectrometer. Mercury vapor analyses were performed daily for 60 days with a Jerome 431-X vapor analyzer. RESULTS: The maximum amount of copper (80 microg), silver (2.6 microg), mercury (15 microg), and tin (550 microg) was found in the precipitate. The maximum amount of mercury vapor released was 67 microg/m(3)/d. CONCLUSION: Under the conditions of this in vitro study, there was a significant amount of elemental leaching and mercury vapor release from the Tytin amalgam over a 60-day period

STATEMENT OF PROBLEM: There are no studies analyzing the effects of a crown in relationship to torsional resistance for a titanium-reinforced core material supported by a post. PURPOSE: This study investigated the effects of post design on the torsional resistance of a crown supported by a titanium-reinforced composite core material (Ti-Core) and 3 endodontic posts (AccessPost, Flexi-Post, and ParaPost). MATERIAL AND METHOD: Three groups of 10 specimens per group were studied. A total of 30 recently extracted human single-rooted (incisors) teeth with their crowns removed were used. Post holes preparations were created according to manufacturer's instructions. All posts were cemented using Flexi-Flow with titanium cement. Scotchbond Multi-Purpose bonding system was used as the bonding system for all groups. All cores were fabricated with Ti-Core with titanium core material with hard copper bands as the matrix. The Ti-Core core material was allowed to set for 1 hour. Metal crowns were fabricated and cemented with zinc phosphate cement. Specimens were placed in a special jig and a clockwise torsional force was applied. Torsional force was measured on a Lebow 1102-200 torque transducer and recorded on a Hewlett Packard 7015B X-Y recorder in inch x ounce. A 1-way analysis of variance (ANOVA) was used to test for statistical significance (P < .001). RESULTS: The torsional values (inch x ounce) were AccessPost 77.2 +/- 30.3, Flexi-Post 162.2 +/- 51.2, and ParaPost 60.9 +/- 28.4. SNK and Scheffe comparison tests revealed that the Flexi-Post group had significantly greater resistance to torque loading than the AccessPost and ParaPost groups, which were statistically similar to each other. CONCLUSION: Post design has an effect on torsional resistance of a crown supported by titanium-reinforced core build-up and post. The threaded split-shank design of the Flexi-Post dowel offers significantly greater resistance to torsional loading than the passive posts studied

The purpose of this in vitro study was to investigate and compare the Barcol microhardness of five different core build-up materials. This study was divided into five groups with 10 specimens per group (specimens were fabricated with a thickness of 1 mm and a diameter of 20 mm). The groups consisted of two resin composites (TI-Core Natural and TI-Core with titanium), one resin-modified glass ionomer (Vitremer), and two conventional glass ionomers (Ketac-Silver and GC Miracle Mix). All specimens were stored in a 100% humidity environment for 24 hours before testing the microhardness. Each specimen had five microhardness readings taken with a Barcol microhardness Indentor. A one-way ANOVA was applied to the data Followed by a Scheffe multiple range comparison test. Results were considered significant if p<0.05. The one-way ANOVA illustrated that there was a significant difference for microhardness of each group. The Scheffe multiple range comparison test demonstrated that Ti-Core Natural (Barcol value of 116) core build-up material was significantly different than Ti-Core with titanium (Barcol value of 112.1) core build-up material and both were significantly greater than Vitremer (Barcol value of 88.04) core build-up material. All specimens for the conventional glass ionomers (Ketac-Silver and GC Miracle Mix) failed during testing and therefore, no Barcol value could be obtained. The composite resin Ti-Core Natural and TI-Core with titanium core build-up materials have a greater resistance to being deformed from masticatory forces than the resin-modified glass ionomer and conventional glass ionomers (where conventional glass ionomers because of their weak physical properties resulted in no Barcol microhardness values obtained)