A study of the incidence of overeruption and occlusal interferences in unopposed posterior teeth

Abstract

Objectives To determine the incidence and extent of overeruption in unopposed posterior teeth; to determine the incidence of occlusal interferences associated with unopposed posterior teeth; and to detect an association between the extent of overeruption and the presence of occlusal interference. Design The study was a single centre clinical retrospective analysis. Setting The setting was in the Combined Care Clinic of Leeds Dental Institute. The patients were undergoing routine restorative care by final year undergraduate dental students during 2000. Subjects and methods All patients over18 years of age with one or more unopposed posterior tooth, were invited to participate. A sample group of 120 subjects were recruited. A clinical occlusal examination was carried out and the presence of initial retruded contact position (RCP) contacts and excursive interferences were recorded. Study models were made and digitally scanned. Outcome measures Measurements of overeruption from the curve of Spee were made from the images obtained, by a single observer. Reliability of the measurements was assessed by means of a Bland Altman Plot. The presence and site of RCP contacts and excursive interferences were recorded by a single observer. Reliability of the measurements was assessed by means of Kappa scores. The association between overeruption and the presence of occlusal interference was examined using Spearmans Correlation Coefficient. Results A total of 120 subjects were recruited, with a total of 155 unopposed sites. Eighty-one of the sites belonged to male subjects, 74 to female subjects. The mean age of the group was 50.9 years, Standard deviation 13.9. Eighty-three per cent of sites displayed overeruption (95% CI 78-90), ranging from under 0.5 mm to 5.4 mm. The reliability of the observations was found to be good. A total of 51.6% (95% CI 44-60) of unopposed teeth were involved in RCP contacts or excursive interferences. Thirty-two sites were involved in more than one contact or interference. The intra-examiner agreement was found to be good, using Kappa. The findings of the Spearman's correlation, show that if an association exists between overeruption and occlusal interference, it is weak, and of no statistical significance. Conclusions Eighty-three per cent of unopposed teeth are likely to overerupt, and the extent of the overeruption may be marked. The incidence and extent of overeruption is of clinical significance, not only in terms of treatment planning to prevent undesirable vertical movement, but also in the restoration of the edentulous space. The reliability of observations made in the study was found to be good, justifying the methodology. Fifty-one point six per cent of unopposed teeth are likely to be involved in RCP contacts or excursive interferences. The incidence is of clinical significance when planning the restoration of unopposed teeth, or the associated edentulous space. Only a weak statistical association was demonstrated between the degree of overeruption and the presence of occlusal interferen...

Comparative analysis of dentognathic pathologies in the Dmanisi mandibles

“…In modern human populations the mean dental overeruption due to missing antagonists was reported to be ~0.8mm (SD 0.65mm) within an interval of >10 years (Christou and Kiliaridis 2007). Other studies suggest that overeruption may reach 2 to 5.4mm (Kiliaridis et al 2000;Craddock and Youngson 2004). Based on these comparative data, the loss of RP4 in D2600 may have happened around 5 to 10 years prior to death.…”

Evolución de la patología oclusal. Una revisión de la literatura.

“…Las alteraciones de posición, por leves que sean, pueden generar puntos de contacto prematuros o interferencias, alterando la fisiología del sistema 62 . Con cualquier tipo de interferencia a nivel dental, el punto de fulcro se modifica, generando cambios desfavorables en el sistema.…”

A Questionnaire Study of Japanese Dentists’ Perceptions of Risks for Overeruption of Molars without Antagonists and Attitude on Prosthetic Intervention

“…6,7 Recently, many retrospective studies have been published, and the results agree with the opinion that overeruption would occur in the presented clinical situation. [8][9][10][11] Although the mechanisms behind the overeruption have not been fully elucidated, several functions including root formation, hydrostatic pressure between tissues investing the tooth crown and its apical extent, and remodeling of bone and periodontal ligament, are believed to cause the overeruption. 12 Thus, a recent review has concluded that overeruption without antagonist is inevitable to occur.…”

“…7 On the other hand, many retrospective studies have been reported more recently, and their results agree with the overeruption of unopposed molar teeth. [8][9][10][11] Two retrospective studies without a control group found overeruption in about 80% of posterior teeth without antagonists. 9,10 A study demonstrated that the mean deviation of unopposed posterior tooth from a Broadrick curve was significantly greater than those for opposed molar tooth in control subjects, indicating overeruption of unopposed molar tooth.…”

“…[8][9][10][11] Two retrospective studies without a control group found overeruption in about 80% of posterior teeth without antagonists. 9,10 A study demonstrated that the mean deviation of unopposed posterior tooth from a Broadrick curve was significantly greater than those for opposed molar tooth in control subjects, indicating overeruption of unopposed molar tooth. 11 A study in young adults found overeruption of lower second mandibular molar without upper second molar when compared to the control subjects.…”