Fogorvosi szemle, 2006 (99. évfolyam, 1-6. szám)

2006-04-01 / 2. szám

62 FOGORVOSI SZEMLE ■ 99. évf. 2. sz. 2006. Conclusions: One year follow up examination verified the bone alteration existing at the baseline which could not be detected by any other methods over the bone scintigraphy. The results of this work indicates the usefulness of bone scintigraphy and suggests to involve this imaging modality into the endodontic diagnostic armamentarium. DR. G. BORSOS, DR. A. VÉGH Department of Orofacial Orthopedics and Orthodontics, Heim Pál Children’s Hospital, Budapest COMPARISON THROUGH RANDOMISED CLINICAL TRIAL OF PALATAL IMPLANT AND CONVENTIONAL ANCHORAGE SYSTEMS IN ADOLESCENTS DURING ORTHODONTIC CANINE RETRACTION Introduction: The purpose of this study was to compare the palatal implant (PI) supported anchorage with a conventional intra-oral dental anchorage (DA) during the upper canine re­traction in adolescent patients, in extraction cases requiring maximum distal anchorage. Material and methods: Based on a Randomized Clinical Trial 18 adolescent patients (mean age 14.2+1.37 years) were treated with two upper first premolar extractions with maximal posterior anchorage indication. All subjects were briefed and signed a consent form agreeing to both of the treatment protocols that were previously approved by the Regional Research Ethic Commission (No.:236/2000). In the PI group (n=9, mean age 13.8+0.92 years) osseointegrated palatal implants (Orthosystem®) were used for maximal an­chorage and in each case a 1.2 mm square stainless steel rigid transpalatal wire was fixed to the implant and to the molar bands by laser-welding. In the DA group (n=9, mean age 14.5+1.68 years) the conventional anchorage was pro­vided by a 0.017x0.025 inch heat-treated SS utility arch which joined the upper first molars to the front teeth, and this was combined with a TPB. For the canine retraction a super elastic closed-coil spring (150 cN) was used beside a 0.016x0.022 inch SS segment arch to ensure torque control in both groups. The duration of the canine retraction in both groups was de­termined. At the beginning and at the end of retraction the A6-PTV distances were measured on the lateral cephalograms. These measurements show the change in the mesial move­ment of the upper first molars. 1. Table Duration of canine retraction and the meanwhile mesialization of the upper first molars Results: There was no significant difference in the dura­tion of the closure of the extraction gap through canine re­traction, which was 5.25+1.73 months for the PI group and 4.97+1.62 months for the DA group. An insignificant differ­ence was found in the average mesial movement of the upper first molars between the two groups. The A6-PTV distance increased in the PI group by 0.5+1.0 mm while in the DA group by 1.6+1.8 mm. (See Table). Discussion: It is known that during maxillary growth the first permanent molars undergo a mesial drift, so the A6-PTV distance increases on average 1 mm per year with the skeleto­­facial growth in adolescents. The measurements in the PI group seem to agree with this observation: an average 0.5 mm increase in the A6-PTV distance was found over the 5.25 months. During the 4.97 month period the measured results in the DA group shows some mesial molar movement on average three times more A6-PTV. This is the first sign of an anchorage loss tendency during the canine retraction period, in the first phase of the front retraction. DR. I. BÖGI Maxillo-Facial Surgery, St. Rókus Hospital, Budapest SURGICAL ALTERNATIVES FOR DENTAL IMPLANTATION IN ADVANCED ATROPHY OF ALVEOLAR PROCESS Subsequent atrophy of the edentous alveolar process exhibit individual differences. Total loss of alveolar process impedes dental implantation representing a major challange for prosthetic rehabilitation. Cases are presented for surgical approaches to restore architecture of the alveolar process appropriate for dental implantation followed by prosthetic rehabilitation. Modified Le Fort osteotomy, augmentation atilizing titan net as well as two novel methods to recover maxillar and facial contour are presented. Transposition of the inferior alveolar nerve followed by autotransplantation and dental implanta­tion as well as free grafting of fibula with vascular stem and simultaneous dental implantation are demonstrated for man­dibular restoration. DR. K. BÖGI, K. DANYI, DR. P. VÁLYI, J. HALÁSZ,1 ZS. SCHAFF,1 DR. A. FAZEKAS Department of Dentistry and Oral Surgery, University of Szeged, Szeged, Hungary; 1 2nd Department of Pathology, Semmelweis University, Budapest, Hungary EXPRESSION OF THE TIGHT-JUNCTION ASSOCIATED CLAUDINS IN NORMAL HUMAN GINGIVA Objective: To explore the expression pattern of five mem­bers of the claudin (CLDN) family in normal human gingival samples. Patients and Methods: Gingival samples were obtained from five healthy, young (between 20-25 years of age) patients with good oral hygiene prior to surgical removal of impacted mandibular third molars. To exclude presence of inflammation formalin fixed, paraffin embedded sections were histologically evaluated and subsequently analyzed for CLDN1, CLDN2, CLDN3, CLDN4 and CLDN7 expression by immunohisto­­chemistry. Upper canine retraction PI group (n = 9) DA group (n = 9) Significance (Student test) Mean SD mean SD AT (months) 5.25 1.73 4.97 1.62 ns (p = 0.621) A6-PTV (mm) 0.50 1.00 1.60 1.80 ns (p = 0.164)

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