Induction of ankylosis in the incisor for orthodontic tooth movement in rats

Cuoghi, Osmar Aparecido; Tondelli, Pedro Marcelo; Sonoda, Celso Koogi; Aiello, Carlos Alberto; Mendonça, Marcos Rogério de; Costa, Silvano César da

doi:10.1111/edt.12056

Cited by 6 publications

(6 citation statements)

References 28 publications

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“…Even at low force magnitude, the harmful effects may occur at higher frequency, due to either anatomical bone, dental and individual periodontal variety, besides stress continuously acting for a long period in the periodontal ligament. Cuoghi, et al 34 (2014) evaluated the effects of CF, CIF and IF in adult rats by histological analysis. These authors found higher root resorptions associated with CF, corroborating data that duration plays an important role in the biological mechanism, promoting different tissue reactions.…”

Section: Discussionmentioning

confidence: 99%

Pulp analysis of teeth submitted to different types of forces: a histological study in rats

et al. 2018

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Objective:The purpose of this study was to histologically evaluate pulp and dentin under induced tooth movement (ITM) with different types of forces.Material and Methods:The maxillary right first molars of rats were submitted to movement with continuous (CF), continuous interrupted (CIF) and intermittent (IF) forces during 5, 7 and 9 days with nickel-titanium (NiTi) closed-coil springs exerting 50cN force magnitude. The groups were histologically evaluated as for cellularity pattern, presence of dystrophic, hemodynamic alterations in the pulp as well dentin alterations. The main observed alterations were related to hemodynamic pulp characteristics, such as presence of thrombosis, vascular congestion and hemorrhages. The hemodynamic alterations were statistically evaluated by Shapiro-Wilk normality test and analysis of variance by the Kruskall-Wallis test.Results:There was no significant differences observed between groups in the different types of applied forces and duration of ITM (vascular congestion, p=1.000; hemorrhage, p=0.305; thrombosis, p=1.000).Conclusions:Pulp tissue alterations resulting from ITM were limited to hemodynamic events, without progressing to irreversible degeneration, regardless of the type of force applied.

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Section: Discussionmentioning

confidence: 99%

Pulp analysis of teeth submitted to different types of forces: a histological study in rats

et al. 2018

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“…To provide stable anchorage and eliminate undesirable effects consequent to continuous eruption, ankylosis was induced in the upper right incisors of each animal 15 days before installation of the coil springs. [16,17] For OTM, the device designed by Heller and Nanda [18] was used, modified by replacing the stainless steel by NiTi spring of 50 cN (Sentalloy, GAC, NY, USA) and inserting photopolymerizable resin (Z100, 3M, St. Paul, MN, USA) into the cervical region of the incisor. The packed resin was used to improve retention of the steel wire in the cervical region of the previously reimplanted incisor and to enable (de) activation of the spring.…”

Section: Methodsmentioning

confidence: 99%

Effect of different types of force on the amount of tooth movement, hyaline areas, and root resorption in rats

Cuoghi

Tondelli

Mendonça

et al. 2018

European Journal of General Dentistry

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Aims: This study evaluated the effects of using continuous, continuous interrupted, and intermittent forces on the roots and periodontal ligaments in the first molars of rats. Materials and Methods: The right first molars of 54 Wistar rats were moved with continuous force (CF group), continuous interrupted force (CIF group), or intermittent force (IF group) for 5, 7, and 9 days. Ankylosed incisors were used as anchors for the orthodontic tooth movement. To establish the different types of force, NiTi springs of 50 cN were maintained, deactivated, or removed for certain periods. Amounts of tooth movement, hyaline areas, and root resorption levels were analyzed using analysis of variance (ANOVA) and post-hoc Tukey's test with a significance level of 5%. Results: There was no difference in the amount of tooth movement between the CF and CIF groups, which differed significantly from the IF group. The CF group demonstrated a significant formation of hyaline areas, nearly 5 times more, mainly on the fifth day. Conclusions: Continuous force produced more hyaline areas with greater probability of generating root resorption. Continuous interrupted force enabled better periodontal ligament repair and more efficient elimination of hyaline areas.

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“…In the first, the murines were 62 days old, and the procedure comprised of inducing dentoal- Figure 2) to promote absolute anchorage for movement of the maxillary right first molar, without influencing the type of force applied during movement, especially CIF. This stage was performed according to a predetermined protocol: 22 the anesthetic (Dopalen -ketamine hydrochloride) and the muscle relaxant (Anasedan -xylazine hydrochloride) -Vetbrands, Paulínia, Brazil -were mixed and applied by intramuscular injection, followed by luxation and extraction, removal of periradicular tissues and dental papilla, root canal obturation with a mixture of calcium hydroxide and propylene glycol, and root apex sealing with a mixture of grey MTA (Angelus, Londrina, Brazil) and distilled water, and replantation.…”

Section: Methodsmentioning

confidence: 99%

Resorption of roots of different dimension induced by different types of forces

et al. 2014

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Root resorption is a variable to be considered in induced tooth movement (ITM). It is related to root morphology and alveolar bone crest, and also to the types of forces exerted by mechanotherapy. This histometric study evaluated the predominance of root resorption among roots of different dimensions, following ITM with different types of forces and at different time intervals. The study was conducted on 54 rats divided into three groups, according to the type of force: continuous (CF), continuous interrupted (CIF) and intermittent (IF), at periods of 5, 7 and 9 days. The percentage of resorption between mesiobuccal roots of larger dimension and intermediate roots of smaller dimension was assessed. The evaluations were performed on the AxioVision software, and the non-parametric analysis of variance for repeated measures in independent groups was further applied, consisting of a scheme of two factors, and complemented by the Dunn test at a significance level of 5%. The intermediate roots presented a higher percentage of resorption, which was gradual at the periods evaluated for the three types of forces, but mainly for CF. Comparing the intermediate roots with the mesiobuccal roots, there was a statistically significant difference (p < 0.05) in the CF group at day 7 and day 9, and in the FI group, at day 9. The intragroup analysis evidenced a statistically significant difference (p < 0.05) between the 5 th and the 9 th day for the intermediate root in the CF group. The intergroup analysis did not reveal any statistically significant difference (p > 0.05) in individually analyzed roots.

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Induction of ankylosis in the incisor for orthodontic tooth movement in rats

Abstract: The methodology used to induce ankylosis in this study was effective for anchoring the incisors during the OTM of rat molars, eliminating the undesirable effects consequent to continuous eruption.

Cited by 6 publications

References 28 publications

Pulp analysis of teeth submitted to different types of forces: a histological study in rats

Pulp analysis of teeth submitted to different types of forces: a histological study in rats

Effect of different types of force on the amount of tooth movement, hyaline areas, and root resorption in rats

Resorption of roots of different dimension induced by different types of forces

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