Reactions of 5-phenyl-3(3H)-thioxo-1,2,4-dithiazole (1) with unsaturated and active phosphonium salts as well as with phosphonates, at r. t. and under the effect of basic catalysis, afforded mainly 1,3,5dithiazines 5, 12, 17a, 17b, 23a or 23b. Substituted 1,3-dithiol 7 and 1,3-thiazoles 13, 19a, 19b, 22a and 22b were isolated as by-products. 1,3,5-Dithiazine products showed pharmacological pote...

PURPOSE The purpose of this study was to determine the average facial proportions and mandibular movement capacity of 316 first-year dental students who carefully recorded them on each other. MATERIALS AND METHODS This early exacting clinical experience was closely supervised by the authors in Columbus, Ohio during 1969-70. Five vertical and six horizontal distances were measured on each subj...

The width of the attached gingiva of 54 children 12-14 years old was measured and compared with its width measured five years before. The width of the attached gingiva of 96 mandibular permanent central incisors at the second examination was grouped according to its width at the first examination. In addition, the width of the attached gingiva of 67 mandibular central incisors, at both examinat...

. AbstrAct The purpose of this clinical trial was to study the influence of platform-switching concept on crestal bone changes at non-submerged straight and inclined implants retaining mandibular overdentures. Eight patients received 2 implants one straight and the other inclined in the canine region of the mandible. Mandibular overdentures were retained using spheroflex abutment attachments, w...

Clinicians agree that tooth agenesis regardless of gender or race becomes more prominent in recent societies. The congenital absence of one or more maxillary lateral incisors is a challenge to effective treatment planning for the restorative dentist. The one-sided orthodontic approach of moving canines mesially to eliminate restorative procedures also leads to compromise. Adult patients present...

Objective- Investigating of the isolation, culture, differentiation potential and electronic microscopic characterization of canine periodontal ligament stem cells (PDLSCs). Design- Experimental in vitro study Animals- Four intact, male, mongrel dogs, 8-10 months-old were selected to collect PDLSCs from their teeth. Procedures- The dogs were anesthetized and the first maxillary and mandibula...

AIM To investigate the morphologic parameters associated with cases of transmigrating mandibular canines. METHODS The orthodontic records of 3,500 patients were examined for the presence of transmigrating mandibular canines. Lateral cephalograms and study casts were analyzed for skeletal and dental parameters. Observations were made as to the sex and age of the subject, and side, location, an...

INTRODUCTION The aim of this study was to analyze the very long-term effects of Herbst treatment on tooth position and occlusion. SUBJECTS Fourteen patients from a sample of 22 with Class II Division 1 malocclusions consecutively treated with the banded Herbst appliance were reexamined 32 years after therapy. METHODS Dental casts were analyzed from before (T1) and after (T2) treatment, and ...

PURPOSE This study evaluated the existence of golden proportion between the widths of the maxillary and mandibular anterior teeth in Indian population. MATERIALS AND METHODS The clinical tooth width measurements were recorded with the digital vernier calipers on 576 patients of both sexes in the age group of 21 - 30 years. Flexible ruler was used to determine the width of maxillary and mandib...

PATIEN'l' J. Z., a white boy 13 years 9 months of age, had a Class II, Division 1 malocclusion. This diagnosis could be determined only in the canine area, since no mandibular molars were present on either the right or the left side. The maxillary arch was normal in width and in protraction. The maxillary right second premolar was blocked out lingually and rotated mesially, and the maxillary le...