Root thickness evaluation of mandibular incisors

Bahareh Dadresanfar,Mehdi Vatanpour,Nahid Mohammadzadeh Akhlaghi,Pooneh Mohebbi,Shabnam Sohanian

doi:10.5348/d01-2015-12-oa-10

Abstract

Aims: Mandibular incisors are the smallest teeth in the mouth. They have thin roots with concavities and are very important for aesthetic and also for speaking. Due to their narrow internal anatomy, preparing the root canal and post space might be very difficult and endangers them for root wall perforation or fracture. The aim of this study was to measure the root thickness of mandibular incisors. Methods: Root wall thicknesses of eighty mandibular incisors were measured in four sections including the CEJ, 3 mm apical to the CEJ, 4 mm and one mm coronal to the apex and in buccal, lingual and proximal surfaces of concavity areas, using a stereomicroscope. Data were statistically analyzed by repeated measured ANOVA and paired t-test. Results: Buccal surface of the buccal canals and lingual surface of the lingual canals in double-canalled incisors had the greatest root thicknesses compare to the proximal surfaces. Root thickness of single-canalled root was more than of double-canalled ones. Proximal walls had the least root thicknesses in all the sections especially in section 4, at 1 mm from the apex, which was less than 1 mm. Conclusion: In order to avoid technical mishaps during root canal procedures, attention must be paid to the thin concavity proximal walls using anticurvature flaring and also in selection of proper size of master apical file.

Highlights

The amount of residual dentin is crucial to the survival of a root filled tooth [1]
Root thickness mean values and standard deviations for each section of the samples were listed in Tables 1 and Table 2
The results of the present study showed that the lingual and buccal surfaces had the maximum root thickness while the proximal surfaces had the minimum thickness (p

Summary

Introduction

The amount of residual dentin is crucial to the survival of a root filled tooth [1]. To avoid iatrogenic mishaps during procedures such as canal instrumentation and preparing the dowel space, one should have enough knowledge about the radicular dentin thickness.Considerable dentin loss, especially where grooves are present or between two fused roots, can initiate periodontal involvement that are difficult to manage [2]. To avoid iatrogenic mishaps during procedures such as canal instrumentation and preparing the dowel space, one should have enough knowledge about the radicular dentin thickness. In addition to periodontal problems, it has been proposed that dentin thickness in association with canal curvature and external root morphology are factors potentially. As mandibular incisors have the smallest size among the teeth [6], the importance of having enough knowledge regarding their thickness is high lightened. Little information is available about the thickness of different canal walls in these teeth before preparation procedures [1]; so the aim of this study was to measure the radicular root thickness in mandibular incisors

Methods

Results

Discussion

Conclusion