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Browsing by Author "Analoui, Mostafa"
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Item Digital Radiographic Analysis of Mineral Density of Adjacent Alveolar Bone in Relation to the Molar Translation Rate After Use of Retromolar Implant Anchorage(1997) Sim, Yeongsuk; Roberts, W. Eugene; Analoui, Mostafa; Hohlt, William F.; Katona, Thomas R.; Shanks, James C., Jr.Molar translation using retromolar implants provides an unique opportunity to measure the rate of orthodontic tooth movement, because implants do not permit any reactive movement from the force. Contrast-corrected digital radiography was utilized to investigate the rate of molar translation related to the mineral density of adjacent alveolar bone. It was hypothesized that the rate of molar translation was inversely correlated with bone mineral density ahead of the moving tooth. Periapical radiographs were obtained every six months during 24 months of active treatment of eight patients (age: 24 to 48 years). Distance from three reference points (crown tip, mid-root, apex) and mineral density of four circular areas in front of the translating molar were analyzed for correlation. The primary method of analysis was the use of Pearson correlation coefficients between rate change and bone mineral density, and between rate change and age. The results showed that rate change of molar translation at the root apex was inversely correlated to the mineral density of adjacent alveolar bone. The correlations were not significant when examining the rate over the first six months; however, the correlations were significant after the second follow-up evaluation at 12 months. The correlation was also significant when using the overall means up to last follow-up visit. However, patient age was not significantly related to the rate of molar translation in this study.Item Occlusal Displacement of Teeth Due to Flexure of the Mandible(1995) Eichel, David A.; Katona, Thomas R.; Analoui, Mostafa; Arbuckle, Gordon R.; Chen, Jie; Shanks, James C.It has been proposed that jaw deformation during function may be a contributor to supraosseous tooth eruption. This could be through a transient pressure gradient in the flexed bone and/or tension in the PDL fibers produced by socket deformation. Thus, the purpose of this study was to determine if forces applied to a fresh frozen canine mandible can lead to occlusal displacement of a tooth. Seven hemisected canine mandibles (14 specimens) were used to test this hypothesis. A force cycle (10 N to 100 N to 300 N) was applied by a Bionix testing machine (MTS TM Systems Corp., Minneapolis, Minn.) to the mandible in three point bending. Digital radiographs were taken at each change in force level using computer digitized radiography (CDR, TM Schick Technologies, Inc., Long Island City, N.Y.). By measuring the relative movement of metal markers (1 mm steel balls) placed into the mandible and the crown of the 2nd premolar, the amount of tooth eruption was calculated. With cyanoacrylate cement (Archer® Instant Bonding Adhesive, Tandy Corp, Ft. Worth, Texas) injected into the PDL space of the same tooth, the test was repeated one week later. These "ankylosed" teeth served as controls. The eruption distances were compared between the experimental and the ankylosed teeth by means of repeated measures analysis of variance. The only significant occlusal displacement was noted as the force was initially raised to 100 N (21.7 ± 40.6 μm). Due to the possible breakdown of the cyanoacrylate cement, the ankylosed teeth also showed evidence of eruption with the continued application of force. Although significant eruption was noted, the displacements were very small. PDL degradation, viscoelastic behavior, measurement of small displacements, limited resolution radiography, and two dimensional analysis are contributing factors to the uncertainty of the results. Further investigation is required to determine if jaw deformation during function is a viable mechanism leading to the occlusal displacement of teeth.Item Treatment of Enamel Demineralization Following Orthodontic Therapy(1997) Stoll, Lana R.; Garetto, Lawrence P.; Analoui, Mostafa; Dunipace, Ann J.; Hohlt, William F.; Schemehorn, Bruce R.; Shanks, JamesThe early-stage, carious, white-spot lesion is a common finding on teeth in patients who have received orthodontic treatment. Recently, a calciumphosphate (Ca-P) treatment was developed to enhance remineralization of white spot lesions. We hypothesized that a rinse containing the Ca-P would promote greater remineralization of demineralized enamel in vivo than a fluoride (F)-containing rinse or a placebo rinse. Thirty post-treatment orthodontic patients with demineralized white spot lesions on one or more of the six maxillary anterior teeth were selected and randomly assigned to three equal groups for a double-blind study. One group was given the placebo rinse. Another group was given a rinse with the same ingredients as the placebo rinse plus 0.055% F. The third group was given a rinse with the same ingredients as the F rinse plus calcium, phosphate, and magnesium salts. In addition, all subjects used a 0.011% F dentifrice before rinsing. Two different methods were used to determine the initial extent and subsequent de- or remineralization of the white spot lesions at the debonding appointment (baseline), and at one, three, and six months after the baseline reading: 1) visual inspection, in which two examiners estimated the severity and location of the lesions, and 2) quantitative laser fluorescence (QLF), in which the depth and area of the lesions were determined more objectively. Lnterexaminer agreement was almost perfect for the clinical exams. All three groups were significantly different with regards to reduction of number of white spots according to the clinical scoring. The placebo rinse group had the greatest reduction followed by the Ca-P group and the fluoride group. The QLF data showed no significant overall group differences for any of the measurements except total lesion depth. The placebo group had a significantly greater reduction of total lesion depth at the last examination than the Ca-P group (p < 0.05). The data suggested that different mechanisms may exist for remineralization of large and small lesions and that remineralization of a lesion with a lower concentration of fluoride, such as that used with the placebo rinse and the fluoride dentifrice, may result in greater remineralization of white-spot lesions.