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Bachhav V.C.,Goa Dental College and Hospital
Quintessence international (Berlin, Germany : 1985)

Ceramics have a long history in fixed prosthodontics of achieving optimal esthetics. Yttrium tetragonal zirconia polycrystal (Y-TZP)-based systems are a recent addition to the high-strength, all-ceramic systems used for crowns and fixed partial dentures. CAD/CAM-produced, Y-TZP-based systems are in considerable demand in esthetic and stress-bearing regions. The highly esthetic nature of zirconia coupled with its superior physical properties and biocompatibility have resulted in restorative systems that meet the demands of today's patients. Undoubtedly, these systems are considered to be prospective replacements for metal-ceramic restorations. This article reviews relevant contemporary literature regarding all-ceramic materials and systems and discusses their material properties, biocompatibility, advances in cementation, and more with special emphasis on clinical survival. The article also aims to provide recommendations for their use. Source

To compare the dimensions of lateral incisor crowns adjacent to unerupted palatally displaced and nondisplaced permanent maxillary canines. The sample consisted of 36 children between 10 and 12 years of age with unerupted maxillary canines. Each presented with a unilaterally palatally displaced (with respect to the lateral incisor) canine. The lateral incisor next to the palatally displaced canine was considered the experimental tooth; the tooth on the contralateral side was considered the control tooth. Measurements were crown width (mesiodistal), thickness (labiopalatal), taper (convergence of the crown toward the incisal edge), taper type, and crown length. No association was found between the experimental and control lateral incisors for crown width and thickness. However, a significant correlation was found for crown taper (P=.048) and length (P=.01). The experimental lateral incisors had a higher mean crown taper (0.54 mm) than the controls (0.24 mm). The mean crown length was smaller for the experimental lateral incisors (6.74 mm) than the control ones (7.55 mm). There is a significantly greater possibility of finding lateral incisors with greater crown taper and shorter length next to palatally displaced canines. However, there is no significant difference in crown width or thickness. © 2010 BY QUINTESSENCE PUBLISHING CO, INC. Source

Prabhu R.V.,Mangalore University | Dinkar A.,Goa Dental College and Hospital | Prabhu V.,Mangalore University
Journal of Forensic and Legal Medicine

Aim: To find the incidence of different types of lip patterns, the dominant pattern, quadrant wise, amongst the Goan population. To assess, the quadrant wise differences in lip patterns among males and females and to report new lip print pattern in Goan population. Methodology: Lip prints of 100 students studying in Goa Dental College & Hospital were taken using 14 mm wide and 50 mm long Scotch tape without any distortion. These prints were then scanned (256 gray shades at a resolution of 300 dpi.) for the digital analysis. Using various applications of Adobe Photoshop 7 software an attempt was made to trace each and every line. K. Suzuki and Y. Tsuchihashi's classification was followed to define the patterns of the grooves. Results: The current study has found the most predominant pattern in Quadrant I to be Type V (580 lines; 52.39%) followed in order by Type I′ (196 lines; 17.70%), Type I (166 lines; 14.99%), Type II (166 lines; 10.47%), Type IV (40 lines; 3.61%), Type III (9 lines; 0.81%). In Quadrant II of this study the most predominant pattern recorded was Type V (589 lines; 50.47%) followed in order by Type I′ (209 lines; 17.90%), Type I (204 lines; 17.48%), Type II (130 lines; 11.13%), Type IV (34 lines; 2.91%), Type III (1 line; 0.08%). In Quadrant III of this study the most predominant pattern recorded was again Type V (484 lines; 52.09%) followed in order by Type I′ (174 lines; 18.72%), Type I (155 lines; 16.68%), Type II (102 lines; 10.97%), Type IV (9 lines; 0.96%), Type III (5 lines; 0.53%). In Quadrant IV of this study the most predominant pattern recorded was Type V (543 lines; 58.19%) followed in order by Type I (151 lines; 16.18%), Type I′ (138 lines; 14.79%), Type II (85 lines; 9.11%), Type III (9 lines; 0.96%), Type IV (7 line; 0.75%). In all four Quadrants the most predominant pattern found in males and females was Type V. The present study recorded the following types of type V patterns for the first time; Trifurcations, Bridge or 'H' pattern, Horizontal Lines, Cartwheel, Pineapple Skin and Multiple Branching Appearance. Conclusion: The digital method of analyzing the Lip Print images using Adobe Photoshop 7 software serves as a convenient method that provides better visualization and ease in identification and recording of the Lip Print pattern. Predominant pattern in all four quadrants was Type V followed by the linear pattern i.e. Type I′ in quadrants I, II, and III and Type I in quadrant IV in the studied population. Distribution of pattern is not affected by the sex. Although type V is the most predominant pattern found in Goan population, the sub-classification of this type defines the more defined term and aids in accuracy of the classification. © 2012 Elsevier Ltd and Faculty of Forensic and Legal Medicine. Source

Dawasaz A.A.,King Khalid University | Dinkar A.D.,Goa Dental College and Hospital
Journal of Forensic Sciences

The palatine rugae possess unique characteristics that could be used when it is difficult to identify a dead person according to fingerprints or dental records. They are permanent and unique to each person. The rugae are surrounded by cheeks, lips, tongue, and buccal pad of fat; hence, they remain protected in trauma, incineration, or mass disasters. Their pattern of orientation is formed by the 12th to 14th week of gestation and remains stable throughout life. In this study, dental casts of 120 patients were analyzed for individual rugae characteristics and strength and subsequent individual codes were given. No two individuals were having exactly matching rugae codes. Dimensions of rugae pattern, incisive papilla, and midpalatal raphe were also noted. Rugae were reevaluated after one year to check its stability, which showed no significant difference. The coding system followed can be adopted as a good and simple technique to achieve electronic transfer of the records of the palatal rugae. © 2013 American Academy of Forensic Sciences. Source

Chalakkal P.,Goa Dental College and Hospital
World journal of orthodontics

To measure the arch length of sides containing palatally displaced canines and to compare them with those of contralateral sides with normally positioned canines. The study sample consisted of 36 children 10 to 12 years of age with unerupted permanent maxillary canines who presented with palatally displaced canines, unilaterally, with respect to the maxillary lateral incisors. The palatal displacement was evaluated using the horizontal tube shift method with periapical radiographs, after the canine cusp tips were found to overlap their adjacent lateral incisors on panoramic radiographs. Arch length was measured on either side from a uniform point on the mesiolingual surface of the permanent first molar to a point on the dental arch that coincided with an anterior extension of the midpalatal raphae. The side that contained the palatally displaced canine was considered experimental, while the contralateral side was the control. The mean, standard deviation, range, and 95% confidence interval values were calculated, and the Student t test was carried out to obtain the P values for the arch lengths. The mean arch length value from the experimental sides was 31.38 ± 1.98 mm (95% CI 29.30 to 33.45). The mean value from the control sides was 32.86 ± 2.28 mm (95% CI 30.48 to 35.24). There is a significantly high possibility of finding palatally displaced canines with respect to maxillary lateral incisors on sides with lesser arch lengths compared to the contralateral sides. © 2011 BY QUINTESSENCE PUBLISHING CO, INC. Source

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