The treatment experience of primary eruption failure of a case / 实用口腔医学杂志

Primary failure of eruption(PFE) is an unusual dental disease.Clinically,it is difficult to distinguish PFE from Mechanical failure of eruption (MFE),and the diagnosis is especially challenging since misdiagnosis and mistreatment always take place.The present paper reports the treatment experience of a case of PFE.

The Safety and Decision Making of Instrumented Surgery in Infectious Spondylitis

OBJECTIVE: Infectious spondylitis is mostly managed by appropriate antibiotic treatment options, and some patients may require surgical interventions. However, surgical interventions that use spinal instrumentation to correct the mechanical instability may be associated with the risk of an increase in the recurrence rate. In this study, we investigated whether spinal instrumentation effects on recurrence of infectious spondylitis. METHODS: The study was conducted as a retrospective study by dividing the subjects into the noninstrumentation surgery and instrumentation surgery groups among a total of 95 patients who had received surgical interventions in infectious spondylitis from 2009 to 2014. The study investigated patient variables such as underlying illness, presumed source of infection, clinical data, laboratory and radiological data, and ultimate outcome, and compared them between the 2 groups. RESULTS: In the 95 patients, instrumentation was not used in 21 patients but it was used in 74 patients. When the disease involved ≥3 vertebral bodies, lumbosacral level and epidural part, noninstrumentation surgery was mainly conducted, but when the disease involved the thoracic level and psoas muscle part, instrumentation surgery was mainly conducted. However, there were no differences between the 2 groups in terms of the recurrence rate and the incidence of primary failure. CONCLUSION: The use of instrumentation in treating infectious spondylitis was determined by the level of involvement and part of the infection, but the use of instrumentation did not cause any increases in the recurrence rate and the incidence of primary failure.

Primary failure of tooth eruption associated with secondarily inflamed dental follicle: inflammatory follicular cyst?

Primary failure of eruption represents a cessation of tooth eruption before emergence not due to a physical barrier or abnormal position and has no systemic cause. This failure of tooth eruption is rare phenomenon and it has not been associated with alterations of dental follicle. This case report describes a permanent right first molar with primary failure of eruption at the inferior border of the mandible presenting microscopic, clinical and radiographic findings compatible with follicular cystic lesion. The follicular tissues of this molar showed microscopic aspects of inflammation. Thus, pericoronal tissues surrounding long-term unerupted teeth with primary failure of eruption has potential to develop into odontogenic cysts. The lesion presented herein probably arose in association with a periodontal pocket mesial to the adjacent second molar, representing an atypical inflammatory follicular cyst. This case shares etiological, radiological and microscopic features with the usual form of the inflammatory follicular cyst associated with infected primary teeth, except for the infection pathways reaching the tooth follicle. The controversies regarding the terminology for this cyst are discussed.

A falha primária de erupção é caracterizada pelo não irrompimento de um dente sem que haja impedimento mecânico ou que o dente esteja em posição anormal ou devido à causas sistêmicas. É um fenômeno raro e não foi associado com alterações do folículo dentário. Este relato descreve um caso de falha primária de erupção de um primeiro molar inferior direito permanente, localizado na base da mandíbula, que apresenta achados clínicos, radiográficos e microscópicos compatíveis com cisto folicular. O folículo pericoronário deste molar apresentou aspectos microscópicos de inflamação. Assim como os tecidos pericoronários dos dentes não irrompidos, a longo prazo, os folículos pericoronários dos dentes com falha primária de irrompimento têm o potencial para desenvolver cistos odontogênicos. Esta lesão provavelmente surgiu em associação com uma bolsa periodontal na mesial do segundo molar adjacente, caracterizando um cisto folicular inflamatório atípico. Este caso apresenta características etiológicas, radiográficas e microscópicas comuns nos cistos foliculares inflamatórios associados a dentes decíduos infectados, com exceção das infecções que alcançam o folículo. São discutidas ainda as controvérsias relativas à terminologia deste cisto.

Eruption failure of teeth / 대한치과교정학회지

The purpose of this study was to present the causes and their mechanisms of eruption failure of teeth and to investigate the treatment modalities. There are so many reports about eruption failure, but most of them are dealing with mechanical interferences. But, we have patients suffered from eruption failure of another causes. Many developmental failures show eruption problems of teeth, although in some cases, the primary failure of eruption (failure of the eruption mechanism itself) can be the primary cause. We have to know about the causes, differences, and the treatment modalities for those abnormalities.

Posterior open bite / 대한치과교정학회지

The purpose of this report is to present the cause and treatment of posterior open bite. Posterior open bite is the open bite limited to posterior teeth. These problem usually are attributed to a mechanical interference with the eruption process, either ankylosis or some soft tissue interference. But, in some patient, lateral open bite is due to a disturbance of the eruptive mechanism itself and other disease or side effect following other treatment. Distinguishing cause of posterior open bite, lack of eruption due to some external interference with eruption or primary failure of eruption mechanism, is important clinically because this determines the prognosis for orthodontic treatments. The characteristics, differential diagnosis with posterior open bite due to other etiologies and the treatment of these problems are presented and discussed.