“In vitro” wear behavior of extracoronal precision attachments
Journal Title: Stomatos - Year 2011, Vol 17, Issue 33
Abstract
The objective of this study was to evaluate the retentive ability and weight change of two extracoronal attachments after repeated insertion/removal cycles. Material and methods: Two extracoronal attachments were used, one with plastic inserts and the other one with conventional metal-alloy. Initial retentive ability was checked under a 20kgf load cell at 5mm/min. The weight of the fixed/removable pairs was verified with an electronic mass comparator. Fixed/removable pairs were tested with an insertion/removal cycling machine, for 5800 cycles (corresponding to 5 years) at a speed of 32 rpm speed. Insertion/ removal cycles were performed under artificial saliva. Weight change and retentive ability of attachments were verified at baseline, six-month, one-year, two-year, three-year, four-year and five-year time intervals. The two-way ANOVA for repeated measurements test was used to verify possible interactions between precision attachment type and retentive ability/weight change over time. Statistically significant associations were found between attachment type and retentive ability over time (P=0.006). Metal-alloy group showed significant differences between baseline and first year (P=0.005), baseline and second year (P=0.001), and between baseline and five years (P=0.035) of insertion/removal cycles. In the plastic insert group, no significant differences were found over time. No statistically significant associations were found between precision attachment types and weight change over time (P=0.643). Initial retentive ability can not be standardized for both attachments; the metal-alloy showed better performance than the plastic insert after five years. Both attachments did not show weight change after five years of simulated use.
Authors and Affiliations
Elken G. Rivaldo, Wellington Cardoso Bonachela, Paulo Henrique Orlato Rossetti, Luis C. F. Frasca
Keywords
Related Articles
- EP ID EP330115
- DOI -
- Views 67
- Downloads 0
Antibacterial effect of oral antiseptics on facultative bacteria
Purpose: To evaluate the antibacterial effect of four oral antiseptics (two solutions of cetylpyridinium chloride, chlorhexidine gluconate and benzalkonium chloride) on facultative bacteria using two methods. Methods: St...
ESTRESSE AO OSSO EM TORNO DE IMPLANTES ORTODÔNTICOS NA REGIÃO DE MOLARES INFERIORES: UMA AVALIAÇÃO POR ELEMENTOS FINITOS
Mini-implantes têm sido utilizados para ancoragem ortodôntica e seu comportamento pode variar de acordo com a sua localização e inclinação, com a posição e a direção da carga aplicada. Este estudo analisou a distri...
TELEHEALTH AS A STRATEGY FOR HEALTHCARE DEVELOPMENT
The World Health Organization (WHO, 2010) understands telehealth as the provision of health services, whenever distance is a critical factor. It relies on information technology and communication, emphasizing diagnosis,...
Inequalities of oral health teams distribution in Brazil
Objective: The objective of the present study was to analyze the inequalities in the distribution of the Oral Health Teams of Primary Health Care in Brazil. Methods: This was a cross-sectional observational study, based...
STRESS TO THE BONE AROUND ORTHODONTIC IMPLANTS IN THE MANDIBULAR MOLAR REGION: A FINITE ELEMENT EVALUATION
Mini-screw implants have been commonly used for orthodontic anchorage. However, the behavior of implants may vary according to their location, inclination, loading position and loading direction. The objective of this st...