title: Stress distribution among periodontally compromised abutments: A comparative study using three-dimensional finite element analysis.
abstract: OBJECTIVE
  The aim of the study was to evaluate the stress distribution patterns in teeth and supporting structures of fixed prosthesis and design modifications in a fixed prosthesis with either normal or reduced bone support of an additional abutment. Study was also undertaken to disprove Ante's law.
  
  
  METHODS
  Main models and variations of main models (modification 1, 2, 3, 4, 5, 6, 7, 8) were subjected to 200 N at angulations of 90° and 15° on functional cusps. Results for each loading were obtained as stress distribution color images and numerical values were recorded. A three-dimensional finite element analysis study of variations of normal models was performed using two finite element softwares, namely PRO-Engineer wildfire version 1.0 manufacturer: Parametric technology corporation, Needham, MA 02494 U.S.A.
  
  
  RESULTS
  When periodontal compromised abutment teeth was splinted with an additional abutment an increase of stress was observed in periodontally compromised abutments so an additional abutment is not required. Eventhough the pericemental area of compromised abutments with an additional abutment (canine) was more than the combined pericemental area of pontics to be replaced, stress generated was more on abutments. This disproves Ante's law. Hence, it may be a reference, but should not be the ultimate criterion in determining the number of multiple abutments.
  
  
  CONCLUSIONS
  When periodontal compromised abutment teeth was splinted with an additional abutment an increase of stress was observed in periodontally compromised abutments so an additional abutment is not required. Even though the pericemental area of compromised abutments with an additional abutment (canine) was more than combined pericemental area of pontics to be replaced, stress generated was more on abutments. This disproves Ante's law. Hence, it may be a reference, but should not be the ultimate criterion in determining the number of multiple abutments.
authors: Department of Prosthodontics, Crown and Bridge and Implantology, People's College of Dental Sciences and Research Centre, Karond, Bhanpur, Bhopal, Madhya Pradesh, India.
authors: Rajkiran
authors: R
authors: Chitumalla
authors: Swapna
authors: S
authors: Munaga
authors: Amit
authors: A
authors: Khare
authors: Surendra
authors: S
authors: Agarwal
authors: Anjali
authors: A
authors: Bhoyar
authors: Swapnil
authors: S
authors: Parlani
keywords: Abutment; stress; three-dimensional finite element
references: J Prosthet Dent. 1991 May;65(5):607-11
references: 2051379
references: J Oral Rehabil. 1992 Jul;19(4):371-83
references: 1432352
references: J Prosthet Dent. 1981 Jul;46(1):32-5
references: 7024515
references: Int J Prosthodont. 1991 Sep-Oct;4(5):416-24
references: 1811637
references: J Dent Res. 1981 May;60(5):873-7
references: 6938563
references: J Periodontol. 1970 Jan;41(1):30-5
references: 4906551
references: J Clin Periodontol. 1982 Sep;9(5):409-14
references: 6958689
references: Acta Odontol Scand. 1995 Aug;53(4):242-8
references: 7484107
references: J Prosthet Dent. 1999 Jun;81(6):721-8
references: 10347362
references: J Oral Rehabil. 1975 Apr;2(2):105-16
references: 1095705
references: J Prosthet Dent. 1992 Dec;68(6):879-84
references: 1494112
references: J Oral Rehabil. 1988 Nov;15(6):615-24
references: 3236132
references: Clin Oral Implants Res. 2007 Jun;18 Suppl 3:63-72
references: 17594371
references: J Periodontol. 2002 Oct;73(10):1184-7
references: 12416777
references: J Oral Rehabil. 1986 Mar;13(2):191-203
references: 3514826