[Effect of inserted angle on the stability of loaded microscrews].
Zhonghua Kou Qiang Yi Xue Za Zhi
; 52(1): 39-43, 2017 Jan 09.
Article
em Zh
| MEDLINE
| ID: mdl-28072993
ABSTRACT
Objective:
To evaluate the effect of different insertion angles on the osseointegration of loaded microscrews in beagle jaws.Methods:
Forty-eight microscrews were inserted at four different angles (30°, 50°, 70° and 90°) into the interradicular zones between the mandibular first molar and third premolar in twelve beagles and the microscrews had been loaded with a force of 2 N immediately for 8 weeks. After microscrew-bone specimens fixed, the maximum output value (Fmax) of pull-out test was recorded and the histomorphological changes of hard tissue were observed. The bone-implant contact (BIC%) was quantitatively analyzed and the osseointegration of microscrew-bone interface was comprehensively evaluated.Results:
Both Fmax and BIC% values of microscrews were influenced by the insertion angles. The maximum value of Fmax was (385±23) N in the group with 50° angle, and the minimum value was (198±16) N in the group with 30° angle(P <0.05). The maximum value of BIC% was (59.1±6.0)% in the group with 70° angle, and the minimum value was (30.2±3.2)% in the group with 30° angle (P <0.05). Histomorphology observation revealed that in peri-screws region, the various degree of bone remodeling was found in different angle samples.Conclusions:
The insertion angles (50°and 70°) were favorable to the stability of the microscrew.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Dente Pré-Molar
/
Parafusos Ósseos
/
Osseointegração
/
Dente Molar
Limite:
Animals
/
Humans
Idioma:
Zh
Revista:
Zhonghua Kou Qiang Yi Xue Za Zhi
Assunto da revista:
ODONTOLOGIA
Ano de publicação:
2017
Tipo de documento:
Article