Effects of cryopreservation on the biomechanical properties of dentin in cryopreserved teeth: An in-vitro study.

This study focused on the biomechanical properties and microstructural changes in dentin of teeth in different age groups after cryopreserved for different durations. Ninety third molars from three age groups (youth group, middle-age group, and elderly group), were collected and randomly divided into three groups according to freezing time at -196 °C (7 days, 30 days, and 90 days). Control group was shored at ordinary temperature. After rewarming, the compressive strength and elastic modulus of the dentin were measured with an electronic universal tester. Scanning electron microscopy was used to evaluate the microstructure of dentin after cryopreservation. After cryopreservation, the compressive strength of the teeth in each experimental group was not significantly different from control group. With the increase of freezing time and age, dentin's elastic modulus showed a decreasing trend. There were statistically significances between the control group and freezing 90d group, freezing 7d and 90d group, youth and middle-aged group, youth and elderly group (P < 0.05). Both freezing time and age factors were significant for the elastic modulus of dentin(P＜0.05). There was no interaction effect for age and freezing time. In transverse sections of scanning electron microscopy, the dentinal tubule became narrower, partially occluded, and more easily adhered to impurities in the long freezing time and elderly group. In longitudinal sections, with freezing time and age, the inner wall of the dentinal tubules became rough especially in the aged group cryopreserved for 90 days. No significant microcracks exited in any of the longitudinal sections of dentin.

Unusual Indications of Teeth Transplantation: A Literature Review.

Dental implants are one of the best valid tooth replacement options, though these are not always appropriate in growing young patients. Tooth autotransplantation can be indicated then. However, this is not the only scenario where dental transplantation can be indicated. This comprehensive literature review discusses a wide range of unusual indications of dental transplantation as reported throughout the medical literature. Surprisingly, these indications include management of some developmental dental anomalies, hypodontia, oroantral communications, alveolar clefts, deficient alveolar ridges, ectopic teeth, and maxillofacial injuries. Limited high-quality evidence in this field regarding most of these unusual indications warrants further research of high-quality design.

Dental autologous transplantation: technique optimization of immediate step by step for clinical practice

Dental transplantation is a treatment used to replace a missing tooth with another tooth. It is autogenous when it comes from the same individual. The aim of this article is to discuss the surgical protocol and present a case study to optimize the technique for the general dental practitioner. The first molars are the first permanent teeth to erupt during infancy, they are teeth most commonly lost among the permanent dentition. The third molars are best suited for this treatment, the treatment should be undertaken as soon as possible, as the patient ages there is decrease in the mesenchymal cells. Whenever possible, the pericoronal bag should be preserved in the removal of the tooth germ or tooth formed. We present a case where the tooth was placed in the receiver socket, taking into account the anatomical orientation of its faces, in infra-occlusion. The contention was made by silk and point "X" on the occlusal graft and fixed to the adjacent teeth with light-cured resin. Transplantation is an excellent alternative for treating the loss of one molar, especially in young patients.

Transplante dentário autólogo realizado no mesmo paciente em etapas diferentes do seu desenvolvimento / Autogenous tooth transplantation in the same patient in different phases on your growing

Comprovadamente, os molares permanentes são os elementos dentários extraídos mais precocemente, podendo ocasionar graves problemas na oclusão dentária, além de dificultar a reabilitação posterior desses pacientes devido a migrações dentárias. O transplante dentário autógeno é definido como a reposição de um elemento dentário, perdido ou ausente, por outro elemento dentário do próprio paciente, constituindo-se em um recurso adicional para minimizar tais problemas. O objetivo deste trabalho é relatar dois casos de transplantes dentários autógenos, realizados no mesmo paciente do gênero masculino, em períodos de vida diferentes, encaminhado ao Serviço de Cirurgia Oral do Hospital de Força Aérea do Galeão /RJ... (AU)

Arguably, the permanent molars, the teeth are extracted earlier and may cause serious problems in dental occlusion also hindering the subsequent rehabilitation of these patients due to dental migrations. The autogenous tooth transplantation is defined as the replacement of a lost or missing tooth, second tooth from the patient, thus becoming an additional resource to minimize such problems. The aim of this paper is to report two cases of autogenous tooth transplants, performed on the same patient males in different periods of life, referred to the Oral Surgery Department of the Força Aérea do Galeão Hospital / RJ.... (AU)

Autotrasplantes dentales: revisiónsistemática de la literatura / Autologous dental transplants: a systematic review of literature

Antecedentes: los autotrasplantes dentales son una técnica que se ha utilizado durantemucho tiempo; sin embargo, son poco utilizados por las múltiples variables que determinansu éxito y la falta de unificación de criterios en la técnica. Objetivo: identificar, por medio deuna revisión sistemática de la literatura, las tasas de éxito de los autotrasplantes dentalesy algunos de los factores que modifican dichas tasas. Método: se realizó una búsqueda deliteratura sobre autotrasplantes dentales en revistas incluidas en las bases de datos biomédicasMedline, EMBASE, CINAHL, Scisearch y PsycLIT, así como en bases de datos electrónicascon un foco específico como Cochrane Controlled Trials Register de la Cochrane Library,Health Technology Assessment y NHS-EED. Se elaboraron medidas de resumen y evaluaciónde la calidad metodológica mediante el programa Revman 5. Resultados: se seleccionaronveintidós artículos en los que las tasas de éxito de los autotrasplantes alcanzaron un 84 %general: 83 % en dientes con ápices cerrados, 95 % cuando se utilizó sutura con férula acrílica y95,75 % en dientes a los que se les realizó terapia endodóntica un mes después del autotransplante.Conclusión: la literatura revisada sugiere que los autotrasplantes dentales pueden seruna alternativa para la restitución a corto, mediano y largo plazo de dientes perdidos, aunqueel nivel de evidencia es III, dado que los estudios analizados son solamente de tipo descriptivo...

Background: Dental autotransplantation is a technique that has been used for a long time;however, it is not frequently used due to the many variables that determine its effectivenessand the lack of unified technical criteria. Aim: Identify, through a systematic review of literature,success rates of tooth autotransplantation and some factors that modify those rates.Method: A literature search on autologous dental transplantation was carried out in journalsincluded in the Medline, EMBASE, CINAHL, SCISEARCH and PsycLIT biomedical databases,as well as in the Cochrane Controlled Trials Register (Cochrane Library), Health TechnologyAssessment and NHS-EED specialized databases. Summary measures were developed andmethodological quality was assessed through the RevMan 5 software. Results: A total of 22articles were selected. They showed 84 % general success rates of autotransplantations, 83 %in closed apex teeth, 95 % when an acrylic splint suture was used, and 95.75 % when rootcanal therapy was carried out one month after the transplantation. Conclusion: The literaturestudied suggests that dental autotransplantation may be an alternative for the restitution oftooth loss in the short-, mid-, and long-term, even though the level of evidence is III becausethe studies analyzed are only descriptive...