A Study on Fracture Resistance of Class IV Cavities Treated with Pins

Тhе use of pins in restoration of large cavities with esthetic resin materials appear in the dental literature after 1970 and there are less than 20 publications, focused around restorations of class IV cavities. The aim of the present study is to test the role of pins in the fracture resistance in...

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Autores principales:	Boteva E., Peycheva K., Karayasheva D., Pashkouleva D., Marinova M.
Formato:	article
Lenguaje:	EN
Publicado:	Sciendo 2014
Materias:	pins operative dentistry fracture resistance Medicine R
Acceso en línea:	https://doaj.org/article/372d092502c94947b188a6c078e6e310
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spelling	oai:doaj.org-article:372d092502c94947b188a6c078e6e3102021-12-02T19:11:12ZA Study on Fracture Resistance of Class IV Cavities Treated with Pins0324-175010.1515/amb-2014-0020https://doaj.org/article/372d092502c94947b188a6c078e6e3102014-12-01T00:00:00Zhttps://doi.org/10.1515/amb-2014-0020https://doaj.org/toc/0324-1750Тhе use of pins in restoration of large cavities with esthetic resin materials appear in the dental literature after 1970 and there are less than 20 publications, focused around restorations of class IV cavities. The aim of the present study is to test the role of pins in the fracture resistance in class IV restorations with resin materials. Materials and methods: 68 matured human upper and lower sound front teeth are included in the study. The groups are upper incisors, lower incisors, canines with or without pins. All cavities are filled with the same resin material, technology and Prime bond NT. Termocycling: 30 days in 30ºС, 100% humidity, 60 days in 100% humidity 2Х12 hours at 35ºС and 40ºС and 100 dry cycles, 20 seconds each in the following order - 45ºС ± 3ºС, room temperature, 5ºС, room temperature, two series, 50 each with two days between in Cultura incubator of Viva Dent 55ºС and ice. Machine for vertical load testing ZD 10/90, load in Newtons (N), from 20 N to 1275 N, speed 0.5 mm/ min, displacement from 0.1 to 1.2 mm. Type of fractures observed: adhesive, cohesive in dentine and in resin material, mixed. Results: The highest proportion of fractures observed was in front teeth with large cavities and with pins, low loading (493-503N). Front teeth with large cavities without pins have better resistance and lower proportion of fractures (488-526N). Canines are more resistible with pins and less without. Lowest resistance is found in lower front teeth when pins are present. Conclusion: In class IV restorations when tissue loses are less than 2/3 of the incisal ridge pins can decrease the fracture resistance of the teeth.Boteva E.Peycheva K.Karayasheva D.Pashkouleva D.Marinova M.Sciendoarticlepinsoperative dentistryfracture resistanceMedicineRENActa Medica Bulgarica, Vol 41, Iss 2, Pp 43-48 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	pins operative dentistry fracture resistance Medicine R
spellingShingle	pins operative dentistry fracture resistance Medicine R Boteva E. Peycheva K. Karayasheva D. Pashkouleva D. Marinova M. A Study on Fracture Resistance of Class IV Cavities Treated with Pins
description	Тhе use of pins in restoration of large cavities with esthetic resin materials appear in the dental literature after 1970 and there are less than 20 publications, focused around restorations of class IV cavities. The aim of the present study is to test the role of pins in the fracture resistance in class IV restorations with resin materials. Materials and methods: 68 matured human upper and lower sound front teeth are included in the study. The groups are upper incisors, lower incisors, canines with or without pins. All cavities are filled with the same resin material, technology and Prime bond NT. Termocycling: 30 days in 30ºС, 100% humidity, 60 days in 100% humidity 2Х12 hours at 35ºС and 40ºС and 100 dry cycles, 20 seconds each in the following order - 45ºС ± 3ºС, room temperature, 5ºС, room temperature, two series, 50 each with two days between in Cultura incubator of Viva Dent 55ºС and ice. Machine for vertical load testing ZD 10/90, load in Newtons (N), from 20 N to 1275 N, speed 0.5 mm/ min, displacement from 0.1 to 1.2 mm. Type of fractures observed: adhesive, cohesive in dentine and in resin material, mixed. Results: The highest proportion of fractures observed was in front teeth with large cavities and with pins, low loading (493-503N). Front teeth with large cavities without pins have better resistance and lower proportion of fractures (488-526N). Canines are more resistible with pins and less without. Lowest resistance is found in lower front teeth when pins are present. Conclusion: In class IV restorations when tissue loses are less than 2/3 of the incisal ridge pins can decrease the fracture resistance of the teeth.
format	article
author	Boteva E. Peycheva K. Karayasheva D. Pashkouleva D. Marinova M.
author_facet	Boteva E. Peycheva K. Karayasheva D. Pashkouleva D. Marinova M.
author_sort	Boteva E.
title	A Study on Fracture Resistance of Class IV Cavities Treated with Pins
title_short	A Study on Fracture Resistance of Class IV Cavities Treated with Pins
title_full	A Study on Fracture Resistance of Class IV Cavities Treated with Pins
title_fullStr	A Study on Fracture Resistance of Class IV Cavities Treated with Pins
title_full_unstemmed	A Study on Fracture Resistance of Class IV Cavities Treated with Pins
title_sort	study on fracture resistance of class iv cavities treated with pins
publisher	Sciendo
publishDate	2014
url	https://doaj.org/article/372d092502c94947b188a6c078e6e310
work_keys_str_mv	AT botevae astudyonfractureresistanceofclassivcavitiestreatedwithpins AT peychevak astudyonfractureresistanceofclassivcavitiestreatedwithpins AT karayashevad astudyonfractureresistanceofclassivcavitiestreatedwithpins AT pashkoulevad astudyonfractureresistanceofclassivcavitiestreatedwithpins AT marinovam astudyonfractureresistanceofclassivcavitiestreatedwithpins AT botevae studyonfractureresistanceofclassivcavitiestreatedwithpins AT peychevak studyonfractureresistanceofclassivcavitiestreatedwithpins AT karayashevad studyonfractureresistanceofclassivcavitiestreatedwithpins AT pashkoulevad studyonfractureresistanceofclassivcavitiestreatedwithpins AT marinovam studyonfractureresistanceofclassivcavitiestreatedwithpins
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A Study on Fracture Resistance of Class IV Cavities Treated with Pins

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