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At least 793 records · Page 44Linked to original sources
PubMed1997

[Analysis of registration parameter of the dental radiographs for digital subtraction].

OBJECTIVE: To investigate the registration parameters in the dental radiographs for digital subtraction, to find out the significance of them and try to improve the quality control of the registration of the dental radiograph for the digital subtraction. METHOD: Sixteen projections of molar and premolar of mandible of minipigs were investigated for stability of the registration system of the dental radiographs. The rotation and the movements of the bite plans were measured with different height of edge of the bite plan. The 128 radiographs with varying parameters of the projection were digital subtracted. The noise of the subtraction photograph was compared for analyses of the relationship between subtraction noise and the projection parameters. RESULTS: The depth of the bite plan and the strength of the connect bar between the X-ray tube and the bite plans are the most significant parameters for the stability of the registration system. The thicker bar the better of the registration was. When the strength of the connected bar is increased, the depth of the bite plan is permitted not too strict. There is not significant effect for digital subtraction with other parameters in this investigation. CONCLUSION: For the best stability of the registration of dental radiographs, the connected bar with 8 mm in diameter is strong enough and the depth of the bite plan between 2.5-4 mm are adequate.

Animals↗
PubMed2000

Apical microsurgery for failed endodontics.

The operating microscope allows the surgeon unparalleled visualization of the root end structures for periapical surgery. The ultrasonic root end preparation tips enable debridement of the resected root end 2 to 4 mm in the long axis of the root. These advances have allowed periapical surgery to be performed at a new level of excellence with, we believe, more predictable healing.

Apicoectomy↗
PubMed2000

An in-vitro comparison of the radiographic and actual gutta-percha terminus.

The purpose of this study was to investigate the difference between the radiographic gutta-percha terminus and the actual gutta-percha terminus of human molars by comparing radiographic obturation results with actual obturation results. Forty maxillary palatal roots and 50 mandibular distal roots were randomly selected from a population of 540. They were then mounted in stone and radiographed. Conventional endodontic therapy was completed using stainless-steel K files and lateral condensation. Each radiographic gutta-percha terminus was evaluated under 4.5x magnification by three examiners following the completion of root canal therapy. These results were recorded. Each tooth was then removed from its mounting, and the actual gutta-percha terminus was evaluated under 4.5x magnification. These results were recorded and compared to the radiographic gutta-percha terminus results. In all 90 teeth examined, the actual gutta-percha terminus was equal to or longer than the radiographic gutta-percha terminus. In the 50 mandibular distal roots, the actual gutta-percha terminus averaged 0.645 mm longer than the radiographic gutta-percha terminus. In the 40 maxillary palatal roots, this difference measured 0.6375 mm.

Dental Pulp Cavity↗
PubMed1999

[The kinetics of apical cicatrization. An experimental study apropos of 25 cases with radiologic imaging].

The conventional usage of endo-canalar antiseptic of Rockle's type (SEPTODONT Laboratory) and the application of a standard protocol during two seances have shown: a 68% successful rate of healing at six months post therapeutic follow up, the diameter decrease of radiological images of peri-apical lesions, more than 80% in relative value; for about 20 teeth drawned lots (in a prospective study). This reduction of 33% at least at the maxillary and 50% at the mandible may be a reliable indicator for an endodontic surgical decision or fixed prosthetic rehabilitation report since the third month (especially peri-apical lesions of more than five millimetres of diameter). The respect of the security apical-limit of the root canal filling is fundamental. The second Senegalese (Dakar) serial will permit us to evaluate the use of calcium hydroxide in mediate and prolonged canalar disinfection.

Adult↗
PubMed2001

One-visit apexification: technique for inducing root-end barrier formation in apical closures.

Numerous procedures and materials have been utilized to induce root-end barrier formation. Mineral trioxide aggregate (MTA) was introduced to dentistry as a root-end filling material. It has been advocated for filling root canals, repairing perforations, pulp capping, and root-end induction. Mineral trioxide aggregate reacts with tissue fluids to form a hard tissue apical barrier. As a result, MTA shows promise as a valuable material for use in one-visit apexification treatment, primarily for treating immature teeth with necrotic pulps.

Aluminum Compounds↗
PubMedDate not supplied

Multifaceted use of ProRoot MTA root canal repair material.

Mineral Trioxide Aggregate (MTA) is a new material recently approved by the FDA for use in pulpal therapy. MTA has been reported to have superior biocompatibility and sealing ability and is less cytotoxic than other materials currently used in pulpal therapy. This report is a review of MTA's physical and biological properties and the clinical techniques of direct pulp capping, apexification, and repair of failed calcium hydroxide therapy.

Aluminum Compounds↗
PubMed2001

[Treatment of Baume class IV pulp diseases with calcium hydroxide: a clinical experimental study in Dakar].

The calcium hydroxide used as intracanalar temporary medication in modern endodontics, is the aim of this clinical and radiographic appraisal of endodontic treatment during two sessions (HESS J. C. and all. 1990); on 22 mature permanent teeth with peri apical lesion. In this second Dakar serial study, the mediate disinfection during 6 weeks in average, was followed by a root canal filling for: 11 mono-radicular teeth by compactage of gutta percha, adjusted monocone for 11 pluri-radicular teeth; and so by definitive coronal restoration. The direct magistral preparations used in this study are not expensive, but simple and efficient; our endodontic processing (pre-treatment and treatment) end up at clinical silence and radiographic apical healing in 90.91% of cases after 9 months for 66.67% of root canal filling located at the safety apical limit.

Adolescent↗
PubMed1998

Management of teeth with open apices and necrotic pulps with single visit apexification: 3 representative cases.

Apexification is the most widely accepted procedure for the treatment of nonvital immature teeth. Single visit apexification is less time consuming, more economical and an easily acceptable technique with the aim of inducing the formation of a hard tissue barrier, thus allowing proper condensation of gutta percha in the root canal. Factors considered during this procedure are: i. Debridement of root canal minimizing the infection and filling the root canal space with resorbable calcification inducing material i.e. Ca(OH)2. ii. Minimal mechanical intervention to maintain the integrity and vascularity of apical region. Once filled, Ca(OH)2 was not changed again and the treated tooth was examined only radiographically till the desired apical closure was achieved. Three representative cases treated with this single visit apexification technique are discussed here. In all the cases successful apical closure of different types was achieved. Treatment was then concluded with gutta percha obturation in all the cases with successful follow up.

Adolescent↗
PubMedDate not supplied

[The effect of instrumentation on original apical foramen shape using steel vs niti rotatory: computerized analysis].

BACKGROUND: A fundamental requirement to obtain a correct endodontic preparation depends on the respect, during cleaning and shaping, of the original morphology of the apical foramen, (AF), so that the filling material will form a complete seal. METHODS: In our previous studies, in order to verify if this presumption was respected using rotary NiTi instruments with cutting tip, we instrumented extracted teeth characterised by a different degree of root curvatures. Using a standardized system to replace the sample, the original shape of the apical foramen of each tooth was recorded using a computerised technique and then compared to the shape after instrumentation. The data showed differences on AF shapes depending on the degree of root canal curvatures. In fact, the teeth with straight canals showed the least alterations on the original AF shape; on the contrary, the teeth with curved canals showed apical foramen enlargement or transportation. Therefore, in the current study we aimed to compare the in vitro effects of stainless steel, (Flexofile, Dentsply Maillefer, Baillaigues, Switzerland), vs NiTi safe cutting tip (Quantec SC, (Tycom Dental, Irvine CA, U:S.A.), vs NiTi non cutting tip, (Quantec LX, Tycom Dental, Irvine CA, U:S.A.), instrumentation on original apical foramen shape. We used NiTi instruments according to standard technique suggested by Tycom, and hand steel files, to instrument the apical third, according to the Crown-Down technique. Working length was fixed at -0.5 from AF. RESULTS AND CONCLUSIONS: Our results suggested that in the presence of accentuated canal curves rotary Niti, with cutting tip, cause significantly more enlargement of the AF area. At the same time, we also observed that NiTi rotary files, with both cutting and non-cutting tip, cause eccentric enlargement of AF in curved canals. Therefore, NiTi engine-driven instruments should be used carefully in the presence of accentuated canal curves to avoid enlargement or transportation of AF, probably because rotary NiTi files may slip out of operative control, leaving a mark on the foramen shape. In the presence of severe curves, we suggest modifying the operative sequences by alternating rotary NiTi with hand NiTi or stainless steel instruments, especially in the preparation of apical third.

Dental Alloys↗
PubMed2002

Calcium hydroxide root canal dressing. Histopathological evaluation of periapical repair at different time periods.

The objective of this study was to evaluate periapical and apical repair using calcium hydroxide root canal dressings for different lengths of times in teeth with induced chronic periapical lesions. A total of 61 root canals of maxillary and mandibular premolars from 4 dogs were used. After mechanical preparation of the root canals using the crown-down technique, and 5.25% NaOCl as irrigating solution, the apical foramen was enlarged in all cases. A calcium hydroxide root canal dressing was applied. The control group did not receive a root canal dressing. The animals were killed at 7, 15 or 30 days. After histological preparation, serial sections were stained with hematoxylin-eosin and Mallory's trichrome. The best histopathological results occurred at 15 and 30 days, and the worst results occurred at 7 days and in the control group.

Alveolar Bone Loss↗
PubMed2000

An evaluation of the effectiveness of two canal lubricants in removing smear layer.

This study used scanning electron microscopy to compare the effectiveness of two new canal lubricants in conjunction with sodium hypochlorite irrigation in removing smear layer. Both lubricants completely removed the smear layer in the coronal and middle thirds of the root canals, but only partially removed the smear layer in the apical thirds. An explanation of the findings is presented and the clinical significance of smear layer is discussed.

Chelating Agents↗