Densitometric evaluation of four radiographic processing solutions

WOS: 000072364300008PubMed ID: 9656875Objective: To determine the performance of different processing solutions using an automatic processor for dental radiography. Study design: One brand of dental X-ray film (Minimax, Chicago, IL, USA) was developed in an automatic processor using four different brands of processing solution: Megasan (MGS, Megasan, Ankara, Turkey), (HAC, Ankara, Turkey), Fuji (Fuji Medical, Hacettepe Cedex, France) and RP X-Omat (Eastman Kodak, Rochester, NY, USA) at a range of temperatures. Performance was evaluated with respect to base plug fog density, relative speed and contrast. Results: All solutions produced acceptable base plus fog values. MGS produced significantly greater densities (P<0.05) than the other three solutions. Contrast obtained with Kodak and Fuji solutions was less than with MGS and HAC. Developing temperature recommended by the manufacturer of the processor were found to be higher than that needed to achieve a clinically acceptable film. Conclusions: Depending on the processor and processing solutions used, exposure time and processing temperature can be modified while maintaining image quality. The cheapest processing solution (MGS) gave the same results as the more expensive

Detectability of chemically induced periapical lesions by limited cone beam computed tomography, intra-oral digital and conventional film radiography

WOS: 000270856600005PubMed ID: 19767516Objective: Our aim was to compare the Accu-I-Tomo (3DX), the Digora (R) Optime image plate system and F-speed film in detecting chemically created apical lesions. Methods: Lesions were created by applying perchloric acid apical to extracted teeth in jaw specimens for 1, 1.5 or 2 h. After being repositioned, teeth were radiographed with Accu-I-Tomo limited cone beam CT (LCBCT), Digora (R) Optime storage phosphor plates (SPP) and F-speed films. Six observers scored the presence of lesions using a five-grade scale. The accuracy of each observer and modality was assessed through receiver operating characteristic (ROC) analysis and A(z) values were compared using two-way ANOVA. Pairwise comparisons of imaging systems were carried out using the Mann-Whitney U-test. Differences in A(z) values were compared using Friedman and Dunn's tests. Kappa (kappa) was used to measure interobserver agreement. Results: The A(z) values were larger for LCBCT than for SPP and film for all acid durations. For 1 h of acid duration a significant difference was found between LCBCT and film (P=0.02) and between LCBCT and SPP (P=0.0043), For 1.5 h a significant difference (P=0.006) was found between LCBCT and SPP only. For 2 h acid duration, there was no significant difference between LCBCT and film or SPP (P>0.05). Between SPP and film no significant difference was found for any acid duration (P>0.05). kappa ranged between fair and moderate for LCBCT and between slight and fair for SPP and film. Conclusion: LCBCT images provided better than or similar detectability as film and SPP images of chemically created periapical lesions. Dentomaxillofacial Radiology (2009) 38, 458-464. doi: 10.1259/dmfr/15206149Scientific Research Project Branch Office of Ege UniversityEge University [2004DIS006]This work was supported by the Scientific Research Project Branch Office of Ege University (2004DIS006). The authors wish to thank all our colleagues and coworkers who contributed to the evaluation of the images. This study was presented at the 13th Biennial Congress of the European Society of Endodontology, 6-8 September 2007, Istanbul, Turkey

The relationship between a primary maxillary incisor with a talon cusp and the permanent successor: A study of 57 cases

Background. Most reported cases of talon cusps in the primary dentition have been on the maxillary central incisors and. the permanent successors have remained unaffected. Four of the five reported cases on a maxillary lateral incisor, however, have been associated with a supernumerary permanent successor. Aim. This paper describes the relationship between the presence of talon cusps on a primary maxillary incisor, and the morphology and number of the permanent successors in a opulation of Chinese children.Design. The dental records of children diagnosed with a talon cusp on a primary incisor were retrieved for review. The diagnoses took place in a regional school dental clinic in Hong Kong between April 2002 and August 2005. Results. Fifty-eight primary maxillary incisors with talon cusps were found. When the central incisors were involved, 32 of the 35 (91.4%) underlying permanent successors were not found to be associated with any odontogenic abnormalities. When the lateral incisors were involved, however, 18 of the 23 cases (78.3%) showed odontogenic abnormalities, 14 of which were associated with supernumerary teeth. Conclusions. The present study shows that, when there is a talon cusp on a primary maxillary lateral incisor, a high proportion of the underlying permanent successors can be expected to exhibit odontogenic abnormalities. © 2007 BSPD, IAPD and Blackwell Publishing Ltd.link_to_subscribed_fulltex