Peg-Shaped Lateral Incisors (Conoid)

Peg-Shaped Lateral Incisors

The most common anomaly in tooth shape in the anterior of the secondary dentition is the peg-shaped (or cone-shaped) lateral incisor, occurring in 1-2% of the population. The tooth is generally conical in shape, broadest cervically, and tapers toward the incisal to a blunt point. Several studies of the identical twins seem to indicate that missing and peg-shaped lateral incisor teeth may be varied expressions of the same generic trait. A most unusual occurrence is that of peg-shaped maxillary central incisor. Peg-shaped teeth develop from one facial lobe (instead of the three facial lobes normally present on anterior teeth).

Woelfel & Scheid. Dental Anatomy: Its Relevance to Dentistry. 6th Ed. 2002.page 331

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Publication: Review on Dentinal Microcracks - ETopics

Abstract

The dentinal radicular microcrack is a difficult clinical problem to diagnose and treat, and it is one of the most common reasons for tooth extraction. These microcracks start in the radicular dentin, and laboratory studies have linked crack formation to some routine endodontic procedures, namely root canal preparation, obturation, and retreatment. Most of these studies were performed using destructive methods, such as the sectioning technique, previously developed for the study of the internal anatomy of teeth. Nowadays, technological advances in the field of imaging may lead to a more thorough understanding of dentinal microcracks. This article seeks to critically appraise the methodological aspects involved in the study of dentinal radicular microcrack formation after root canal preparation, obturation, and retreatment.

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Hard Tissue Debris Removal: XP Endo Finisher

Book Chapter: The Root Canal Biofilm

Very honored for being invited by Dr Luis E. Chávez de Paz, Dr. Christine M. Sedgley and Dr. Anil Kishen to write the chapter entitled "Root Canal Anatomy: Implications in Biofilm Disinfection" (pages 155-187) with Dr. Ronald Ordinola-Zapata in their new book "The Root Canal Biofilm". For more information, please click HERE.

Publication: Middle Mesial Canal

Middle mesial canals in mandibular first molars: 

a micro-CT study in different populations

Marco Aurélio Versiani, Ronald Ordinola-Zapata, Ali Keleş, Hatice Alcin, 

Clóvis Monteiro Bramante, Jesus Djalma Pécora, Manoel Damião Sousa-Neto

Objective

To describe the morphological aspects of middle mesial canals (MMC) in mandibular first molars using micro-CT.

Design

Mandibular first molars collected from the Brazilian (n=136) and Turkish (n=122) populations were scanned (voxel size: 9.9 μm) and mesial roots with MMC (n=48) evaluated regarding several morphological aspects. The incidence of MMC in each population was statistically compared using Chi-square test (α=0.05).

Results

Overall, the incidence of MMC was 18.6% (48 out of 258 molars) and was significantly higher in the Brazilian (n=30; 22.1%) than in the Turkish (n=18; 14.8%) population (p<0.05). In both populations, confluent configuration of the MMC was the most frequent anatomy. Most of the specimens with MMC had 3 independent orifices (n=26; 54.2%) and 3 apical foramina (n=21; 43.8%). The mean minor diameter of the MMC orifice (0.16 mm) was 3 times less than the other orifices (∼0.50 mm). In mesial roots with independent configuration (n=3; 6.3%), the mean volumes (mm3) of the MMC, mesiobuccal (MBC) and mesiolingual (MLC) canals were 0.20±0.10, 0.75±0.28, and 0.88±0.19, respectively. In the specimens with canal confluence (n=26; 54.2%), MMC merged to the MBC (n=8; 16.7%), MLC (n=4; 8.3%), or to both MBC and MLC (n=14; 29.2%). Double mesial canal was observed in only 1 specimen. MMC with an independent foramen was observed mostly in Brazilian specimens.

Conclusions

Incidence of MMC was higher in the Brazilian molars. Confluent configuration was the most revalent anatomic variation, while independent and fin configurations, as well as, double MMC, were found only in a few specimens.

Keywords
mandibular molar; middle mesial canal; micro-CT; root canal anatomy

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Publication: International Endodontic Journal

Micro-CT evaluation of the efficacy of hard tissue removal from the root canal and isthmus area by positive and negative pressure irrigation systems

M. A. Versiani, F. R. F. Alves, C. V. Andrade-Junior, M. F. Marceliano-Alves, J. C. Provenzano, I.N.Rocas, M. D. Sousa-Neto & J. F. Siqueira Jr

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Rotary Preparation: Mandibular Molar

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